# HG changeset patch
# User Matthew Turk <matthewturk@gmail.com>
# Date 1282839881 21600
# Branch yt2-reorganization
# Node ID c6b41bae4551bcbca86efa061d317ca63baea751
# Parent  87b5d03be7855cb99e3919d1de934110b0e49fc9
Moving lots more around, adding setup.py files

diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 check_for_setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/check_for_setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,4 @@
+import os
+
+for dirpath, dirnames, filenames in os.walk("yt"):
+    if "setup.py" not in filenames: print dirpath
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/CICDeposit.pyx
--- a/yt/_amr_utils/CICDeposit.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,80 +0,0 @@
-"""
-Simle integrators for the radiative transfer equation
-
-Author: Britton Smith <brittonsmith@gmail.com>
-Affiliation: CASA/University of Colorado
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-@cython.boundscheck(False)
-@cython.wraparound(False)
-def CICDeposit_3(np.ndarray[np.float64_t, ndim=1] posx,
-                 np.ndarray[np.float64_t, ndim=1] posy,
-                 np.ndarray[np.float64_t, ndim=1] posz,
-                 np.ndarray[np.float32_t, ndim=1] mass,
-                 np.int64_t npositions,
-                 np.ndarray[np.float32_t, ndim=3] field,
-                 np.ndarray[np.float64_t, ndim=1] leftEdge,
-                 np.ndarray[np.int32_t, ndim=1] gridDimension,
-                 np.float64_t cellSize):
-
-    cdef int i1, j1, k1, n
-    cdef double xpos, ypos, zpos
-    cdef double fact, edge0, edge1, edge2
-    cdef double le0, le1, le2
-    cdef float dx, dy, dz, dx2, dy2, dz2
-
-    edge0 = (<float> gridDimension[0]) - 0.5001
-    edge1 = (<float> gridDimension[1]) - 0.5001
-    edge2 = (<float> gridDimension[2]) - 0.5001
-    fact = 1.0 / cellSize
-
-    le0 = leftEdge[0]
-    le1 = leftEdge[1]
-    le2 = leftEdge[2]
-
-    for n in range(npositions):
-
-        # Compute the position of the central cell
-        xpos = fmin(fmax((posx[n] - le0)*fact, 0.5001), edge0)
-        ypos = fmin(fmax((posy[n] - le1)*fact, 0.5001), edge1)
-        zpos = fmin(fmax((posz[n] - le2)*fact, 0.5001), edge2)
-
-        i1  = <int> (xpos + 0.5)
-        j1  = <int> (ypos + 0.5)
-        k1  = <int> (zpos + 0.5)
-
-        # Compute the weights
-        dx = (<float> i1) + 0.5 - xpos
-        dy = (<float> j1) + 0.5 - ypos
-        dz = (<float> k1) + 0.5 - zpos
-        dx2 =  1.0 - dx
-        dy2 =  1.0 - dy
-        dz2 =  1.0 - dz
-
-        # Interpolate from field into sumfield
-        field[i1-1,j1-1,k1-1] += mass[n] * dx  * dy  * dz
-        field[i1  ,j1-1,k1-1] += mass[n] * dx2 * dy  * dz
-        field[i1-1,j1  ,k1-1] += mass[n] * dx  * dy2 * dz
-        field[i1  ,j1  ,k1-1] += mass[n] * dx2 * dy2 * dz
-        field[i1-1,j1-1,k1  ] += mass[n] * dx  * dy  * dz2
-        field[i1  ,j1-1,k1  ] += mass[n] * dx2 * dy  * dz2
-        field[i1-1,j1  ,k1  ] += mass[n] * dx  * dy2 * dz2
-        field[i1  ,j1  ,k1  ] += mass[n] * dx2 * dy2 * dz2
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/ContourFinding.pyx
--- a/yt/_amr_utils/ContourFinding.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,176 +0,0 @@
-"""
-A two-pass contour finding algorithm
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-import numpy as np
-cimport numpy as np
-cimport cython
-
-cdef extern from "math.h":
-    double fabs(double x)
-
-cdef inline np.int64_t i64max(np.int64_t i0, np.int64_t i1):
-    if i0 > i1: return i0
-    return i1
-
-cdef inline np.int64_t i64min(np.int64_t i0, np.int64_t i1):
-    if i0 < i1: return i0
-    return i1
-
-@cython.boundscheck(False)
-def construct_boundary_relationships(
-        np.ndarray[dtype=np.int64_t, ndim=3] contour_ids):
-    # We only look at the boundary and one cell in
-    cdef int i, j, nx, ny, nz, offset_i, offset_j, oi, oj
-    cdef np.int64_t c1, c2
-    tree = []
-    nx = contour_ids.shape[0]
-    ny = contour_ids.shape[1]
-    nz = contour_ids.shape[2]
-    # First x-pass
-    for i in range(ny):
-        for j in range(nz):
-            for offset_i in range(3):
-                oi = offset_i - 1
-                if i == 0 and oi == -1: continue
-                if i == ny - 1 and oj == 1: continue
-                for offset_j in range(3):
-                    oj = offset_j - 1
-                    if j == 0 and oj == -1: continue
-                    if j == nz - 1 and oj == 1: continue
-                    c1 = contour_ids[0, i, j]
-                    c2 = contour_ids[1, i + oi, j + oj]
-                    if c1 > -1 and c2 > -1:
-                        tree.append((i64max(c1,c2), i64min(c1,c2)))
-                    c1 = contour_ids[nx-1, i, j]
-                    c2 = contour_ids[nx-2, i + oi, j + oj]
-                    if c1 > -1 and c2 > -1:
-                        tree.append((i64max(c1,c2), i64min(c1,c2)))
-    # Now y-pass
-    for i in range(nx):
-        for j in range(nz):
-            for offset_i in range(3):
-                oi = offset_i - 1
-                if i == 0 and oi == -1: continue
-                if i == nx - 1 and oj == 1: continue
-                for offset_j in range(3):
-                    oj = offset_j - 1
-                    if j == 0 and oj == -1: continue
-                    if j == nz - 1 and oj == 1: continue
-                    c1 = contour_ids[i, 0, j]
-                    c2 = contour_ids[i + oi, 1, j + oj]
-                    if c1 > -1 and c2 > -1:
-                        tree.append((i64max(c1,c2), i64min(c1,c2)))
-                    c1 = contour_ids[i, ny-1, j]
-                    c2 = contour_ids[i + oi, ny-2, j + oj]
-                    if c1 > -1 and c2 > -1:
-                        tree.append((i64max(c1,c2), i64min(c1,c2)))
-    for i in range(nx):
-        for j in range(ny):
-            for offset_i in range(3):
-                oi = offset_i - 1
-                if i == 0 and oi == -1: continue
-                if i == nx - 1 and oj == 1: continue
-                for offset_j in range(3):
-                    oj = offset_j - 1
-                    if j == 0 and oj == -1: continue
-                    if j == ny - 1 and oj == 1: continue
-                    c1 = contour_ids[i, j, 0]
-                    c2 = contour_ids[i + oi, j + oj, 1]
-                    if c1 > -1 and c2 > -1:
-                        tree.append((i64max(c1,c2), i64min(c1,c2)))
-                    c1 = contour_ids[i, j, nz-1]
-                    c2 = contour_ids[i + oi, j + oj, nz-2]
-                    if c1 > -1 and c2 > -1:
-                        tree.append((i64max(c1,c2), i64min(c1,c2)))
-    return tree
-
-cdef inline int are_neighbors(
-            np.float64_t x1, np.float64_t y1, np.float64_t z1,
-            np.float64_t dx1, np.float64_t dy1, np.float64_t dz1,
-            np.float64_t x2, np.float64_t y2, np.float64_t z2,
-            np.float64_t dx2, np.float64_t dy2, np.float64_t dz2,
-        ):
-    # We assume an epsilon of 1e-15
-    if fabs(x1-x2) > 0.5*(dx1+dx2): return 0
-    if fabs(y1-y2) > 0.5*(dy1+dy2): return 0
-    if fabs(z1-z2) > 0.5*(dz1+dz2): return 0
-    return 1
-
-@cython.boundscheck(False)
-@cython.wraparound(False)
-def identify_field_neighbors(
-            np.ndarray[dtype=np.float64_t, ndim=1] field,
-            np.ndarray[dtype=np.float64_t, ndim=1] x,
-            np.ndarray[dtype=np.float64_t, ndim=1] y,
-            np.ndarray[dtype=np.float64_t, ndim=1] z,
-            np.ndarray[dtype=np.float64_t, ndim=1] dx,
-            np.ndarray[dtype=np.float64_t, ndim=1] dy,
-            np.ndarray[dtype=np.float64_t, ndim=1] dz,
-        ):
-    # We assume this field is pre-jittered; it has no identical values.
-    cdef int outer, inner, N, added
-    cdef np.float64_t x1, y1, z1, dx1, dy1, dz1
-    N = field.shape[0]
-    #cdef np.ndarray[dtype=np.object_t] joins
-    joins = [[] for outer in range(N)]
-    #joins = np.empty(N, dtype='object')
-    for outer in range(N):
-        if (outer % 10000) == 0: print outer, N
-        x1 = x[outer]
-        y1 = y[outer]
-        z1 = z[outer]
-        dx1 = dx[outer]
-        dy1 = dy[outer]
-        dz1 = dz[outer]
-        this_joins = joins[outer]
-        added = 0
-        # Go in reverse order
-        for inner in range(outer, 0, -1):
-            if not are_neighbors(x1, y1, z1, dx1, dy1, dz1,
-                                 x[inner], y[inner], z[inner],
-                                 dx[inner], dy[inner], dz[inner]):
-                continue
-            # Hot dog, we have a weiner!
-            this_joins.append(inner)
-            added += 1
-            if added == 26: break
-    return joins
-
-@cython.boundscheck(False)
-@cython.wraparound(False)
-def extract_identified_contours(int max_ind, joins):
-    cdef int i
-    contours = []
-    for i in range(max_ind + 1): # +1 to get to the max_ind itself
-        contours.append(set([i]))
-        if len(joins[i]) == 0:
-            continue
-        proto_contour = [i]
-        for j in joins[i]:
-            proto_contour += contours[j]
-        proto_contour = set(proto_contour)
-        for j in proto_contour:
-            contours[j] = proto_contour
-    return contours
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/DepthFirstOctree.pyx
--- a/yt/_amr_utils/DepthFirstOctree.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,167 +0,0 @@
-"""
-This is a recursive function to return a depth-first octree
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-import numpy as np
-cimport numpy as np
-cimport cython
-
-cdef class position:
-    cdef public int output_pos, refined_pos
-    def __cinit__(self):
-        self.output_pos = 0
-        self.refined_pos = 0
-
-cdef class OctreeGrid:
-    cdef public object child_indices, fields, left_edges, dimensions, dx
-    cdef public int level
-    def __cinit__(self,
-                  np.ndarray[np.int32_t, ndim=3] child_indices,
-                  np.ndarray[np.float64_t, ndim=4] fields,
-                  np.ndarray[np.float64_t, ndim=1] left_edges,
-                  np.ndarray[np.int32_t, ndim=1] dimensions,
-                  np.ndarray[np.float64_t, ndim=1] dx,
-                  int level):
-        self.child_indices = child_indices
-        self.fields = fields
-        self.left_edges = left_edges
-        self.dimensions = dimensions
-        self.dx = dx
-        self.level = level
-
-cdef class OctreeGridList:
-    cdef public object grids
-    def __cinit__(self, grids):
-        self.grids = grids
-
-    def __getitem__(self, int item):
-        return self.grids[item]
-
-@cython.boundscheck(False)
-def RecurseOctreeDepthFirst(int i_i, int j_i, int k_i,
-                            int i_f, int j_f, int k_f,
-                            position curpos, int gi, 
-                            np.ndarray[np.float64_t, ndim=2] output,
-                            np.ndarray[np.int32_t, ndim=1] refined,
-                            OctreeGridList grids):
-    cdef int i, i_off, j, j_off, k, k_off, ci, fi
-    cdef int child_i, child_j, child_k
-    cdef OctreeGrid child_grid
-    cdef OctreeGrid grid = grids[gi-1]
-    cdef np.ndarray[np.int32_t, ndim=3] child_indices = grid.child_indices
-    cdef np.ndarray[np.int32_t, ndim=1] dimensions = grid.dimensions
-    cdef np.ndarray[np.float64_t, ndim=4] fields = grid.fields
-    cdef np.ndarray[np.float64_t, ndim=1] leftedges = grid.left_edges
-    cdef np.float64_t dx = grid.dx[0]
-    cdef np.float64_t child_dx
-    cdef np.ndarray[np.float64_t, ndim=1] child_leftedges
-    cdef np.float64_t cx, cy, cz
-    for i_off in range(i_f):
-        i = i_off + i_i
-        cx = (leftedges[0] + i*dx)
-        for j_off in range(j_f):
-            j = j_off + j_i
-            cy = (leftedges[1] + j*dx)
-            for k_off in range(k_f):
-                k = k_off + k_i
-                cz = (leftedges[2] + k*dx)
-                ci = grid.child_indices[i,j,k]
-                if ci == -1:
-                    for fi in range(fields.shape[0]):
-                        output[curpos.output_pos,fi] = fields[fi,i,j,k]
-                    refined[curpos.refined_pos] = 0
-                    curpos.output_pos += 1
-                    curpos.refined_pos += 1
-                else:
-                    refined[curpos.refined_pos] = 1
-                    curpos.refined_pos += 1
-                    child_grid = grids[ci-1]
-                    child_dx = child_grid.dx[0]
-                    child_leftedges = child_grid.left_edges
-                    child_i = int((cx - child_leftedges[0])/child_dx)
-                    child_j = int((cy - child_leftedges[1])/child_dx)
-                    child_k = int((cz - child_leftedges[2])/child_dx)
-                    s = RecurseOctreeDepthFirst(child_i, child_j, child_k, 2, 2, 2,
-                                        curpos, ci, output, refined, grids)
-    return s
-
-@cython.boundscheck(False)
-def RecurseOctreeByLevels(int i_i, int j_i, int k_i,
-                          int i_f, int j_f, int k_f,
-                          np.ndarray[np.int32_t, ndim=1] curpos,
-                          int gi, 
-                          np.ndarray[np.float64_t, ndim=2] output,
-                          np.ndarray[np.int32_t, ndim=2] genealogy,
-                          np.ndarray[np.float64_t, ndim=2] corners,
-                          OctreeGridList grids):
-    cdef np.int32_t i, i_off, j, j_off, k, k_off, ci, fi
-    cdef int child_i, child_j, child_k
-    cdef OctreeGrid child_grid
-    cdef OctreeGrid grid = grids[gi-1]
-    cdef int level = grid.level
-    cdef np.ndarray[np.int32_t, ndim=3] child_indices = grid.child_indices
-    cdef np.ndarray[np.int32_t, ndim=1] dimensions = grid.dimensions
-    cdef np.ndarray[np.float64_t, ndim=4] fields = grid.fields
-    cdef np.ndarray[np.float64_t, ndim=1] leftedges = grid.left_edges
-    cdef np.float64_t dx = grid.dx[0]
-    cdef np.float64_t child_dx
-    cdef np.ndarray[np.float64_t, ndim=1] child_leftedges
-    cdef np.float64_t cx, cy, cz
-    cdef int cp
-    for i_off in range(i_f):
-        i = i_off + i_i
-        cx = (leftedges[0] + i*dx)
-        if i_f > 2: print k, cz
-        for j_off in range(j_f):
-            j = j_off + j_i
-            cy = (leftedges[1] + j*dx)
-            for k_off in range(k_f):
-                k = k_off + k_i
-                cz = (leftedges[2] + k*dx)
-                cp = curpos[level]
-                corners[cp, 0] = cx 
-                corners[cp, 1] = cy 
-                corners[cp, 2] = cz
-                genealogy[curpos[level], 2] = level
-                # always output data
-                for fi in range(fields.shape[0]):
-                    output[cp,fi] = fields[fi,i,j,k]
-                ci = child_indices[i,j,k]
-                if ci > -1:
-                    child_grid = grids[ci-1]
-                    child_dx = child_grid.dx[0]
-                    child_leftedges = child_grid.left_edges
-                    child_i = int((cx-child_leftedges[0])/child_dx)
-                    child_j = int((cy-child_leftedges[1])/child_dx)
-                    child_k = int((cz-child_leftedges[2])/child_dx)
-                    # set current child id to id of next cell to examine
-                    genealogy[cp, 0] = curpos[level+1] 
-                    # set next parent id to id of current cell
-                    genealogy[curpos[level+1]:curpos[level+1]+8, 1] = cp
-                    s = RecurseOctreeByLevels(child_i, child_j, child_k, 2, 2, 2,
-                                              curpos, ci, output, genealogy,
-                                              corners, grids)
-                curpos[level] += 1
-    return s
-
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/FixedInterpolator.c
--- a/yt/_amr_utils/FixedInterpolator.c	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,130 +0,0 @@
-/************************************************************************
-* Copyright (C) 2009 Matthew Turk.  All Rights Reserved.
-*
-* This file is part of yt.
-*
-* yt is free software; you can redistribute it and/or modify
-* it under the terms of the GNU General Public License as published by
-* the Free Software Foundation; either version 3 of the License, or
-* (at your option) any later version.
-*
-* This program is distributed in the hope that it will be useful,
-* but WITHOUT ANY WARRANTY; without even the implied warranty of
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-* GNU General Public License for more details.
-*
-* You should have received a copy of the GNU General Public License
-* along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*
-************************************************************************/
-
-
-//
-// A small, tiny, itty bitty module for computation-intensive interpolation
-// that I can't seem to make fast in Cython
-//
-
-#include "FixedInterpolator.h"
-
-#define VINDEX(A,B,C) data[((((A)+ci[0])*(ds[1]+1)+((B)+ci[1]))*(ds[2]+1)+ci[2]+(C))]
-//  (((C*ds[1])+B)*ds[0]+A)
-#define OINDEX(A,B,C) data[(A)*(ds[1]+1)*(ds[2]+1)+(B)*ds[2]+(B)+(C)]
-
-npy_float64 fast_interpolate(int ds[3], int ci[3], npy_float64 dp[3],
-                             npy_float64 *data)
-{
-    int i;
-    npy_float64 dv, dm[3];
-    for(i=0;i<3;i++)dm[i] = (1.0 - dp[i]);
-    dv  = 0.0;
-    dv += VINDEX(0,0,0) * (dm[0]*dm[1]*dm[2]);
-    dv += VINDEX(0,0,1) * (dm[0]*dm[1]*dp[2]);
-    dv += VINDEX(0,1,0) * (dm[0]*dp[1]*dm[2]);
-    dv += VINDEX(0,1,1) * (dm[0]*dp[1]*dp[2]);
-    dv += VINDEX(1,0,0) * (dp[0]*dm[1]*dm[2]);
-    dv += VINDEX(1,0,1) * (dp[0]*dm[1]*dp[2]);
-    dv += VINDEX(1,1,0) * (dp[0]*dp[1]*dm[2]);
-    dv += VINDEX(1,1,1) * (dp[0]*dp[1]*dp[2]);
-    /*assert(dv < -20);*/
-    return dv;
-}
-
-npy_float64 offset_interpolate(int ds[3], npy_float64 dp[3], npy_float64 *data)
-{
-    int i;
-    npy_float64 dv, vz[4];
-
-    dv = 1.0 - dp[2];
-    vz[0] = dv*OINDEX(0,0,0) + dp[2]*OINDEX(0,0,1);
-    vz[1] = dv*OINDEX(0,1,0) + dp[2]*OINDEX(0,1,1);
-    vz[2] = dv*OINDEX(1,0,0) + dp[2]*OINDEX(1,0,1);
-    vz[3] = dv*OINDEX(1,1,0) + dp[2]*OINDEX(1,1,1);
-
-    dv = 1.0 - dp[1];
-    vz[0] = dv*vz[0] + dp[1]*vz[1];
-    vz[1] = dv*vz[2] + dp[1]*vz[3];
-
-    dv = 1.0 - dp[0];
-    vz[0] = dv*vz[0] + dp[0]*vz[1];
-
-    return vz[0];
-}
-
-npy_float64 trilinear_interpolate(int ds[3], int ci[3], npy_float64 dp[3],
-				  npy_float64 *data)
-{
-    /* dims is one less than the dimensions of the array */
-    int i;
-    npy_float64 dm[3], vz[4];
-  //dp is the distance to the plane.  dm is val, dp = 1-val
-    for(i=0;i<3;i++)dm[i] = (1.0 - dp[i]);
-    
-  //First interpolate in z
-    vz[0] = dm[2]*VINDEX(0,0,0) + dp[2]*VINDEX(0,0,1);
-    vz[1] = dm[2]*VINDEX(0,1,0) + dp[2]*VINDEX(0,1,1);
-    vz[2] = dm[2]*VINDEX(1,0,0) + dp[2]*VINDEX(1,0,1);
-    vz[3] = dm[2]*VINDEX(1,1,0) + dp[2]*VINDEX(1,1,1);
-
-  //Then in y
-    vz[0] = dm[1]*vz[0] + dp[1]*vz[1];
-    vz[1] = dm[1]*vz[2] + dp[1]*vz[3];
-
-  //Then in x
-    vz[0] = dm[0]*vz[0] + dp[0]*vz[1];
-    /*assert(dv < -20);*/
-    return vz[0];
-}
-
-npy_float64 eval_gradient(int *ds, int *ci, npy_float64 *dp,
-				  npy_float64 *data, npy_float64 *grad)
-{
-    // We just take some small value
-
-    int i;
-    npy_float64 denom, plus, minus, backup, normval;
-    
-    normval = 0.0;
-    for (i = 0; i < 3; i++) {
-      backup = dp[i];
-      grad[i] = 0.0;
-      if (dp[i] >= 0.95) {plus = dp[i]; minus = dp[i] - 0.05;}
-      else if (dp[i] <= 0.05) {plus = dp[i] + 0.05; minus = 0.0;}
-      else {plus = dp[i] + 0.05; minus = dp[i] - 0.05;}
-      //fprintf(stderr, "DIM: %d %0.3lf %0.3lf\n", i, plus, minus);
-      denom = plus - minus;
-      dp[i] = plus;
-      grad[i] += trilinear_interpolate(ds, ci, dp, data) / denom;
-      dp[i] = minus;
-      grad[i] -= trilinear_interpolate(ds, ci, dp, data) / denom;
-      dp[i] = backup;
-      normval += grad[i]*grad[i];
-    }
-    if (normval != 0.0){
-      normval = sqrt(normval);
-      for (i = 0; i < 3; i++) grad[i] /= -normval;
-      //fprintf(stderr, "Normval: %0.3lf %0.3lf %0.3lf %0.3lf\n",
-      //        normval, grad[0], grad[1], grad[2]);
-    }else{
-      grad[0]=grad[1]=grad[2]=0.0;
-    }
-}
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/FixedInterpolator.h
--- a/yt/_amr_utils/FixedInterpolator.h	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,45 +0,0 @@
-/************************************************************************
-* Copyright (C) 2009 Matthew Turk.  All Rights Reserved.
-*
-* This file is part of yt.
-*
-* yt is free software; you can redistribute it and/or modify
-* it under the terms of the GNU General Public License as published by
-* the Free Software Foundation; either version 3 of the License, or
-* (at your option) any later version.
-*
-* This program is distributed in the hope that it will be useful,
-* but WITHOUT ANY WARRANTY; without even the implied warranty of
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-* GNU General Public License for more details.
-*
-* You should have received a copy of the GNU General Public License
-* along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*
-************************************************************************/
-
-
-//
-// A small, tiny, itty bitty module for computation-intensive interpolation
-// that I can't seem to make fast in Cython
-//
-
-#include "Python.h"
-
-#include <stdio.h>
-#include <math.h>
-#include <signal.h>
-#include <ctype.h>
-
-#include "numpy/ndarrayobject.h"
-
-npy_float64 fast_interpolate(int ds[3], int ci[3], npy_float64 dp[3],
-                             npy_float64 *data);
-
-npy_float64 offset_interpolate(int ds[3], npy_float64 dp[3], npy_float64 *data);
-
-npy_float64 trilinear_interpolate(int ds[3], int ci[3], npy_float64 dp[3],
-				  npy_float64 *data);
-
-npy_float64 eval_gradient(int ds[3], int ci[3], npy_float64 dp[3],
-				  npy_float64 *data, npy_float64 *grad);
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/Interpolators.pyx
--- a/yt/_amr_utils/Interpolators.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,116 +0,0 @@
-"""
-Simple interpolators
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-import numpy as np
-cimport numpy as np
-cimport cython
-
-@cython.boundscheck(False)
-def UnilinearlyInterpolate(np.ndarray[np.float64_t, ndim=1] table,
-                           np.ndarray[np.float64_t, ndim=1] x_vals,
-                           np.ndarray[np.float64_t, ndim=1] x_bins,
-                           np.ndarray[np.int32_t, ndim=1] x_is,
-                           np.ndarray[np.float64_t, ndim=1] output):
-    cdef double x, xp, xm
-    cdef int i, x_i, y_i
-    for i in range(x_vals.shape[0]):
-        x_i = x_is[i]
-        x = x_vals[i]
-        dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
-        xp = (x - x_bins[x_i]) * dx_inv
-        xm = (x_bins[x_i+1] - x) * dx_inv
-        output[i]  = table[x_i  ] * (xm) \
-                   + table[x_i+1] * (xp)
-
-@cython.boundscheck(False)
-def BilinearlyInterpolate(np.ndarray[np.float64_t, ndim=2] table,
-                          np.ndarray[np.float64_t, ndim=1] x_vals,
-                          np.ndarray[np.float64_t, ndim=1] y_vals,
-                          np.ndarray[np.float64_t, ndim=1] x_bins,
-                          np.ndarray[np.float64_t, ndim=1] y_bins,
-                          np.ndarray[np.int32_t, ndim=1] x_is,
-                          np.ndarray[np.int32_t, ndim=1] y_is,
-                          np.ndarray[np.float64_t, ndim=1] output):
-    cdef double x, xp, xm
-    cdef double y, yp, ym
-    cdef double dx_inv, dy_inv
-    cdef int i, x_i, y_i
-    for i in range(x_vals.shape[0]):
-        x_i = x_is[i]
-        y_i = y_is[i]
-        x = x_vals[i]
-        y = y_vals[i]
-        dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
-        dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
-        xp = (x - x_bins[x_i]) * dx_inv
-        yp = (y - y_bins[y_i]) * dy_inv
-        xm = (x_bins[x_i+1] - x) * dx_inv
-        ym = (y_bins[y_i+1] - y) * dy_inv
-        output[i]  = table[x_i  , y_i  ] * (xm*ym) \
-                   + table[x_i+1, y_i  ] * (xp*ym) \
-                   + table[x_i  , y_i+1] * (xm*yp) \
-                   + table[x_i+1, y_i+1] * (xp*yp)
-
-@cython.boundscheck(False)
-def TrilinearlyInterpolate(np.ndarray[np.float64_t, ndim=3] table,
-                           np.ndarray[np.float64_t, ndim=1] x_vals,
-                           np.ndarray[np.float64_t, ndim=1] y_vals,
-                           np.ndarray[np.float64_t, ndim=1] z_vals,
-                           np.ndarray[np.float64_t, ndim=1] x_bins,
-                           np.ndarray[np.float64_t, ndim=1] y_bins,
-                           np.ndarray[np.float64_t, ndim=1] z_bins,
-                           np.ndarray[np.int_t, ndim=1] x_is,
-                           np.ndarray[np.int_t, ndim=1] y_is,
-                           np.ndarray[np.int_t, ndim=1] z_is,
-                           np.ndarray[np.float64_t, ndim=1] output):
-    cdef double x, xp, xm
-    cdef double y, yp, ym
-    cdef double z, zp, zm
-    cdef double dx_inv, dy_inv, dz_inv
-    cdef int i, x_i, y_i, z_i
-    for i in range(x_vals.shape[0]):
-        x_i = x_is[i]
-        y_i = y_is[i]
-        z_i = z_is[i]
-        x = x_vals[i]
-        y = y_vals[i]
-        z = z_vals[i]
-        dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
-        dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
-        dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])
-        xp = (x - x_bins[x_i]) * dx_inv
-        yp = (y - y_bins[y_i]) * dy_inv
-        zp = (z - z_bins[z_i]) * dz_inv
-        xm = (x_bins[x_i+1] - x) * dx_inv
-        ym = (y_bins[y_i+1] - y) * dy_inv
-        zm = (z_bins[z_i+1] - z) * dz_inv
-        output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \
-                   + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \
-                   + table[x_i  ,y_i+1,z_i  ] * (xm*yp*zm) \
-                   + table[x_i  ,y_i  ,z_i+1] * (xm*ym*zp) \
-                   + table[x_i+1,y_i  ,z_i+1] * (xp*ym*zp) \
-                   + table[x_i  ,y_i+1,z_i+1] * (xm*yp*zp) \
-                   + table[x_i+1,y_i+1,z_i  ] * (xp*yp*zm) \
-                   + table[x_i+1,y_i+1,z_i+1] * (xp*yp*zp)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/Octree.pyx
--- a/yt/_amr_utils/Octree.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,280 +0,0 @@
-"""
-A refine-by-two AMR-specific octree
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: UCSD
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-
-import numpy as np
-cimport numpy as np
-# Double up here for def'd functions
-cimport numpy as cnp
-cimport cython
-
-from stdlib cimport malloc, free, abs
-
-cdef extern from "stdlib.h":
-    # NOTE that size_t might not be int
-    void *alloca(int)
-
-cdef struct OctreeNode:
-    np.float64_t *val
-    np.float64_t weight_val
-    np.int64_t pos[3]
-    int level
-    int nvals
-    OctreeNode *children[2][2][2]
-
-cdef void OTN_add_value(OctreeNode *self,
-        np.float64_t *val, np.float64_t weight_val):
-    cdef int i
-    for i in range(self.nvals):
-        self.val[i] += val[i]
-    self.weight_val += weight_val
-
-cdef void OTN_refine(OctreeNode *self):
-    cdef int i, j, i1, j1
-    cdef np.int64_t npos[3]
-    cdef OctreeNode *node
-    for i in range(2):
-        npos[0] = self.pos[0] * 2 + i
-        for j in range(2):
-            npos[1] = self.pos[1] * 2 + j
-            # We have to be careful with allocation...
-            for k in range(2):
-                npos[2] = self.pos[2] * 2 + k
-                self.children[i][j][k] = OTN_initialize(
-                            npos,
-                            self.nvals, self.val, self.weight_val,
-                            self.level + 1)
-    for i in range(self.nvals): self.val[i] = 0.0
-    self.weight_val = 0.0
-
-cdef OctreeNode *OTN_initialize(np.int64_t pos[3], int nvals,
-                        np.float64_t *val, np.float64_t weight_val,
-                        int level):
-    cdef OctreeNode *node
-    cdef int i, j
-    node = <OctreeNode *> malloc(sizeof(OctreeNode))
-    node.pos[0] = pos[0]
-    node.pos[1] = pos[1]
-    node.pos[2] = pos[2]
-    node.nvals = nvals
-    node.val = <np.float64_t *> malloc(
-                nvals * sizeof(np.float64_t))
-    for i in range(nvals):
-        node.val[i] = val[i]
-    node.weight_val = weight_val
-    for i in range(2):
-        for j in range(2):
-            for k in range(2):
-                node.children[i][j][k] = NULL
-    node.level = level
-    return node
-
-cdef void OTN_free(OctreeNode *node):
-    cdef int i, j
-    for i in range(2):
-        for j in range(2):
-            for k in range(2):
-                if node.children[i][j][k] == NULL: continue
-                OTN_free(node.children[i][j][k])
-    free(node.val)
-    free(node)
-
-cdef class Octree:
-    cdef int nvals
-    cdef np.int64_t po2[80]
-    cdef OctreeNode ****root_nodes
-    cdef np.int64_t top_grid_dims[3]
-
-    def __cinit__(self, np.ndarray[np.int64_t, ndim=1] top_grid_dims,
-                  int nvals):
-        cdef int i, j
-        cdef OctreeNode *node
-        cdef np.int64_t pos[3]
-        cdef np.float64_t *vals = <np.float64_t *> alloca(
-                sizeof(np.float64_t)*nvals)
-        cdef np.float64_t weight_val = 0.0
-        self.nvals = nvals
-        for i in range(nvals): vals[i] = 0.0
-
-        self.top_grid_dims[0] = top_grid_dims[0]
-        self.top_grid_dims[1] = top_grid_dims[1]
-        self.top_grid_dims[2] = top_grid_dims[2]
-
-        # This wouldn't be necessary if we did bitshifting...
-        for i in range(80):
-            self.po2[i] = 2**i
-        # Cython doesn't seem to like sizeof(OctreeNode ***)
-        self.root_nodes = <OctreeNode ****> \
-            malloc(sizeof(void*) * top_grid_dims[0])
-
-        # We initialize our root values to 0.0.
-        for i in range(top_grid_dims[0]):
-            pos[0] = i
-            self.root_nodes[i] = <OctreeNode ***> \
-                malloc(sizeof(OctreeNode **) * top_grid_dims[1])
-            for j in range(top_grid_dims[1]):
-                pos[1] = j
-                self.root_nodes[i][j] = <OctreeNode **> \
-                    malloc(sizeof(OctreeNode *) * top_grid_dims[1])
-                for k in range(top_grid_dims[2]):
-                    pos[2] = k
-                    self.root_nodes[i][j][k] = OTN_initialize(
-                        pos, nvals, vals, weight_val, 0)
-
-    cdef void add_to_position(self,
-                 int level, np.int64_t pos[3],
-                 np.float64_t *val,
-                 np.float64_t weight_val):
-        cdef int i, j
-        cdef OctreeNode *node
-        node = self.find_on_root_level(pos, level)
-        cdef np.int64_t fac
-        for L in range(level):
-            if node.children[0][0][0] == NULL:
-                OTN_refine(node)
-            # Maybe we should use bitwise operators?
-            fac = self.po2[level - L - 1]
-            i = (pos[0] >= fac*(2*node.pos[0]+1))
-            j = (pos[1] >= fac*(2*node.pos[1]+1))
-            k = (pos[2] >= fac*(2*node.pos[2]+1))
-            node = node.children[i][j][k]
-        OTN_add_value(node, val, weight_val)
-            
-    cdef OctreeNode *find_on_root_level(self, np.int64_t pos[3], int level):
-        # We need this because the root level won't just have four children
-        # So we find on the root level, then we traverse the tree.
-        cdef np.int64_t i, j
-        i = <np.int64_t> (pos[0] / self.po2[level])
-        j = <np.int64_t> (pos[1] / self.po2[level])
-        k = <np.int64_t> (pos[2] / self.po2[level])
-        return self.root_nodes[i][j][k]
-        
-    
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    def add_array_to_tree(self, int level,
-            np.ndarray[np.int64_t, ndim=1] pxs,
-            np.ndarray[np.int64_t, ndim=1] pys,
-            np.ndarray[np.int64_t, ndim=1] pzs,
-            np.ndarray[np.float64_t, ndim=2] pvals,
-            np.ndarray[np.float64_t, ndim=1] pweight_vals):
-        cdef int np = pxs.shape[0]
-        cdef int p
-        cdef cnp.float64_t *vals
-        cdef cnp.float64_t *data = <cnp.float64_t *> pvals.data
-        cdef cnp.int64_t pos[3]
-        for p in range(np):
-            vals = data + self.nvals*p
-            pos[0] = pxs[p]
-            pos[1] = pys[p]
-            pos[2] = pzs[p]
-            self.add_to_position(level, pos, vals, pweight_vals[p])
-
-    def add_grid_to_tree(self, int level,
-                         np.ndarray[np.int64_t, ndim=1] start_index,
-                         np.ndarray[np.float64_t, ndim=2] pvals,
-                         np.ndarray[np.float64_t, ndim=2] wvals,
-                         np.ndarray[np.int32_t, ndim=2] cm):
-        pass
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    def get_all_from_level(self, int level, int count_only = 0):
-        cdef int i, j
-        cdef int total = 0
-        vals = []
-        for i in range(self.top_grid_dims[0]):
-            for j in range(self.top_grid_dims[1]):
-                for k in range(self.top_grid_dims[2]):
-                    total += self.count_at_level(self.root_nodes[i][j][k], level)
-        if count_only: return total
-        # Allocate our array
-        cdef np.ndarray[np.int64_t, ndim=2] npos
-        cdef np.ndarray[np.float64_t, ndim=2] nvals
-        cdef np.ndarray[np.float64_t, ndim=1] nwvals
-        npos = np.zeros( (total, 2), dtype='int64')
-        nvals = np.zeros( (total, self.nvals), dtype='float64')
-        nwvals = np.zeros( total, dtype='float64')
-        cdef np.int64_t curpos = 0
-        cdef np.int64_t *pdata = <np.int64_t *> npos.data
-        cdef np.float64_t *vdata = <np.float64_t *> nvals.data
-        cdef np.float64_t *wdata = <np.float64_t *> nwvals.data
-        for i in range(self.top_grid_dims[0]):
-            for j in range(self.top_grid_dims[1]):
-                for k in range(self.top_grid_dims[2]):
-                    curpos += self.fill_from_level(self.root_nodes[i][j][k],
-                        level, curpos, pdata, vdata, wdata)
-        return npos, nvals, nwvals
-
-    cdef int count_at_level(self, OctreeNode *node, int level):
-        cdef int i, j
-        # We only really return a non-zero, calculated value if we are at the
-        # level in question.
-        if node.level == level:
-            # We return 1 if there are no finer points at this level and zero
-            # if there are
-            return (node.children[0][0][0] == NULL)
-        if node.children[0][0][0] == NULL: return 0
-        cdef int count = 0
-        for i in range(2):
-            for j in range(2):
-                for k in range(2):
-                    count += self.count_at_level(node.children[i][j][k], level)
-        return count
-
-    cdef int fill_from_level(self, OctreeNode *node, int level,
-                              np.int64_t curpos,
-                              np.int64_t *pdata,
-                              np.float64_t *vdata,
-                              np.float64_t *wdata):
-        cdef int i, j
-        if node.level == level:
-            if node.children[0][0][0] != NULL: return 0
-            for i in range(self.nvals):
-                vdata[self.nvals * curpos + i] = node.val[i]
-            wdata[curpos] = node.weight_val
-            pdata[curpos * 3] = node.pos[0]
-            pdata[curpos * 3 + 1] = node.pos[1]
-            pdata[curpos * 3 + 2] = node.pos[2]
-            return 1
-        if node.children[0][0] == NULL: return 0
-        cdef np.int64_t added = 0
-        for i in range(2):
-            for j in range(2):
-                for k in range(2):
-                    added += self.fill_from_level(node.children[i][j][k],
-                            level, curpos + added, pdata, vdata, wdata)
-        return added
-
-    def __dealloc__(self):
-        cdef int i, j
-        for i in range(self.top_grid_dims[0]):
-            for j in range(self.top_grid_dims[1]):
-                for k in range(self.top_grid_dims[2]):
-                    OTN_free(self.root_nodes[i][j][k])
-                free(self.root_nodes[i][j])
-            free(self.root_nodes[i])
-        free(self.root_nodes)
-
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/PointsInVolume.pyx
--- a/yt/_amr_utils/PointsInVolume.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,217 +0,0 @@
-"""
-Checks for points contained in a volume
-
-Author: John Wise <jwise77@gmail.com>
-Affiliation: Princeton
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2009 John.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-
-import numpy as np
-cimport numpy as np
-cimport cython
-
-cdef extern from "math.h":
-    double fabs(double x)
-
-@cython.wraparound(False)
-@cython.boundscheck(False)
-def planar_points_in_volume(
-                   np.ndarray[np.float64_t, ndim=2] points,
-                   np.ndarray[np.int8_t, ndim=1] pmask,  # pixel mask
-                   np.ndarray[np.float64_t, ndim=1] left_edge,
-                   np.ndarray[np.float64_t, ndim=1] right_edge,
-                   np.ndarray[np.int32_t, ndim=3] mask,
-                   float dx):
-    cdef np.ndarray[np.int8_t, ndim=1] \
-         valid = np.zeros(points.shape[0], dtype='int8')
-    cdef int i, dim, count
-    cdef int ex
-    cdef double dx_inv
-    cdef unsigned int idx[3]
-    count = 0
-    dx_inv = 1.0 / dx
-    for i in xrange(points.shape[0]):
-        if pmask[i] == 0:
-            continue
-        ex = 1
-        for dim in xrange(3):
-            if points[i,dim] < left_edge[dim] or points[i,dim] > right_edge[dim]:
-                valid[i] = ex = 0
-                break
-        if ex == 1:
-            for dim in xrange(3):
-                idx[dim] = <unsigned int> \
-                           ((points[i,dim] - left_edge[dim]) * dx_inv)
-            if mask[idx[0], idx[1], idx[2]] == 1:
-                valid[i] = 1
-                count += 1
-
-    cdef np.ndarray[np.int32_t, ndim=1] result = np.empty(count, dtype='int32')
-    count = 0
-    for i in xrange(points.shape[0]):
-        if valid[i] == 1 and pmask[i] == 1:
-            result[count] = i
-            count += 1
-        
-    return result
-
-cdef inline void set_rotated_pos(
-            np.float64_t cp[3], np.float64_t rdds[3][3],
-            np.float64_t rorigin[3], int i, int j, int k):
-    cdef int oi
-    for oi in range(3):
-        cp[oi] = rdds[0][oi] * (0.5 + i) \
-               + rdds[1][oi] * (0.5 + j) \
-               + rdds[2][oi] * (0.5 + k) \
-               + rorigin[oi]
-
-#@cython.wraparound(False)
-#@cython.boundscheck(False)
-def grid_points_in_volume(
-                   np.ndarray[np.float64_t, ndim=1] box_lengths,
-                   np.ndarray[np.float64_t, ndim=1] box_origin,
-                   np.ndarray[np.float64_t, ndim=2] rot_mat,
-                   np.ndarray[np.float64_t, ndim=1] grid_left_edge,
-                   np.ndarray[np.float64_t, ndim=1] grid_right_edge,
-                   np.ndarray[np.float64_t, ndim=1] dds,
-                   np.ndarray[np.int32_t, ndim=3] mask,
-                   int break_first):
-    cdef int n[3], i, j, k, ax
-    cdef np.float64_t rds[3][3], cur_pos[3], rorigin[3]
-    for i in range(3):
-        rorigin[i] = 0.0
-    for i in range(3):
-        n[i] = mask.shape[i]
-        for j in range(3):
-            # Set up our transposed dx, which has a component in every
-            # direction
-            rds[i][j] = dds[i] * rot_mat[j,i]
-            # In our rotated coordinate system, the box origin is 0,0,0
-            # so we subtract the box_origin from the grid_origin and rotate
-            # that
-            rorigin[j] += (grid_left_edge[i] - box_origin[i]) * rot_mat[j,i]
-
-    for i in range(n[0]):
-        for j in range(n[1]):
-            for k in range(n[2]):
-                set_rotated_pos(cur_pos, rds, rorigin, i, j, k)
-                if (cur_pos[0] > box_lengths[0]): continue
-                if (cur_pos[1] > box_lengths[1]): continue
-                if (cur_pos[2] > box_lengths[2]): continue
-                if (cur_pos[0] < 0.0): continue
-                if (cur_pos[1] < 0.0): continue
-                if (cur_pos[2] < 0.0): continue
-                if break_first:
-                    if mask[i,j,k]: return 1
-                else:
-                    mask[i,j,k] = 1
-    return 0
-
-cdef void normalize_vector(np.float64_t vec[3]):
-    cdef int i
-    cdef np.float64_t norm = 0.0
-    for i in range(3):
-        norm += vec[i]*vec[i]
-    norm = norm**0.5
-    for i in range(3):
-        vec[i] /= norm
-
-cdef void get_cross_product(np.float64_t v1[3],
-                            np.float64_t v2[3],
-                            np.float64_t cp[3]):
-    cp[0] = v1[1]*v2[2] - v1[2]*v2[1]
-    cp[1] = v1[3]*v2[0] - v1[0]*v2[3]
-    cp[2] = v1[0]*v2[1] - v1[1]*v2[0]
-    #print cp[0], cp[1], cp[2]
-
-cdef int check_projected_overlap(
-        np.float64_t sep_ax[3], np.float64_t sep_vec[3], int gi,
-        np.float64_t b_vec[3][3], np.float64_t g_vec[3][3]):
-    cdef int g_ax, b_ax
-    cdef np.float64_t tba, tga, ba, ga, sep_dot
-    ba = ga = sep_dot = 0.0
-    for g_ax in range(3):
-        # We need the grid vectors, which we'll precompute here
-        tba = tga = 0.0
-        for b_ax in range(3):
-            tba += b_vec[g_ax][b_ax] * sep_vec[b_ax]
-            tga += g_vec[g_ax][b_ax] * sep_vec[b_ax]
-        ba += fabs(tba)
-        ga += fabs(tga)
-        sep_dot += sep_vec[g_ax] * sep_ax[g_ax]
-    #print sep_vec[0], sep_vec[1], sep_vec[2],
-    #print sep_ax[0], sep_ax[1], sep_ax[2]
-    return (fabs(sep_dot) > ba+ga)
-    # Now we do 
-
-@cython.wraparound(False)
-@cython.boundscheck(False)
-def find_grids_in_inclined_box(
-        np.ndarray[np.float64_t, ndim=2] box_vectors,
-        np.ndarray[np.float64_t, ndim=1] box_center,
-        np.ndarray[np.float64_t, ndim=2] grid_left_edges,
-        np.ndarray[np.float64_t, ndim=2] grid_right_edges):
-
-    # http://www.gamasutra.com/view/feature/3383/simple_intersection_tests_for_games.php?page=5
-    cdef int n = grid_right_edges.shape[0]
-    cdef int g_ax, b_ax, gi
-    cdef np.float64_t b_vec[3][3], g_vec[3][3], a_vec[3][3], sep_ax[15][3]
-    cdef np.float64_t sep_vec[3], norm
-    cdef np.ndarray[np.int32_t, ndim=1] good = np.zeros(n, dtype='int32')
-    cdef np.ndarray[np.float64_t, ndim=2] grid_centers
-    # Fill in our axis unit vectors
-    for b_ax in range(3):
-        for g_ax in range(3):
-            a_vec[b_ax][g_ax] = <np.float64_t> (b_ax == g_ax)
-    grid_centers = (grid_right_edges + grid_left_edges)/2.0
-
-    # Now we pre-compute our candidate separating axes, because the unit
-    # vectors for all the grids are identical
-    for b_ax in range(3):
-        # We have 6 principal axes we already know, which are the grid (domain)
-        # principal axes and the box axes
-        sep_ax[b_ax][0] = sep_ax[b_ax][1] = sep_ax[b_ax][2] = 0.0
-        sep_ax[b_ax][b_ax] = 1.0 # delta_ijk, for grid axes
-        for g_ax in range(3):
-            b_vec[b_ax][g_ax] = 0.5*box_vectors[b_ax,g_ax]
-            sep_ax[b_ax + 3][g_ax] = b_vec[b_ax][g_ax] # box axes
-        normalize_vector(sep_ax[b_ax + 3])
-        for g_ax in range(3):
-            get_cross_product(b_vec[b_ax], a_vec[g_ax], sep_ax[b_ax*3 + g_ax + 6])
-            normalize_vector(sep_ax[b_ax*3 + g_ax + 6])
-
-    for gi in range(n):
-        for g_ax in range(3):
-            # Calculate the separation vector
-            sep_vec[g_ax] = grid_centers[gi, g_ax] - box_center[g_ax]
-            # Calculate the grid axis lengths
-            g_vec[g_ax][0] = g_vec[g_ax][1] = g_vec[g_ax][2] = 0.0
-            g_vec[g_ax][g_ax] = 0.5 * (grid_right_edges[gi, g_ax]
-                                     - grid_left_edges[gi, g_ax])
-        for b_ax in range(15):
-            #print b_ax,
-            if check_projected_overlap(
-                        sep_ax[b_ax], sep_vec, gi,
-                        b_vec,  g_vec):
-                good[gi] = 1
-                break
-    return good
-
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/QuadTree.pyx
--- a/yt/_amr_utils/QuadTree.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,257 +0,0 @@
-"""
-A refine-by-two AMR-specific quadtree
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: UCSD
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-
-import numpy as np
-cimport numpy as np
-# Double up here for def'd functions
-cimport numpy as cnp
-cimport cython
-
-from stdlib cimport malloc, free, abs
-
-cdef extern from "stdlib.h":
-    # NOTE that size_t might not be int
-    void *alloca(int)
-
-cdef struct QuadTreeNode:
-    np.float64_t *val
-    np.float64_t weight_val
-    np.int64_t pos[2]
-    int level
-    int nvals
-    QuadTreeNode *children[2][2]
-
-cdef void QTN_add_value(QuadTreeNode *self,
-        np.float64_t *val, np.float64_t weight_val):
-    cdef int i
-    for i in range(self.nvals):
-        self.val[i] += val[i]
-    self.weight_val += weight_val
-
-cdef void QTN_refine(QuadTreeNode *self):
-    cdef int i, j, i1, j1
-    cdef np.int64_t npos[2]
-    cdef QuadTreeNode *node
-    for i in range(2):
-        npos[0] = self.pos[0] * 2 + i
-        for j in range(2):
-            npos[1] = self.pos[1] * 2 + j
-            # We have to be careful with allocation...
-            self.children[i][j] = QTN_initialize(
-                        npos,
-                        self.nvals, self.val, self.weight_val,
-                        self.level + 1)
-    for i in range(self.nvals): self.val[i] = 0.0
-    self.weight_val = 0.0
-
-cdef QuadTreeNode *QTN_initialize(np.int64_t pos[2], int nvals,
-                        np.float64_t *val, np.float64_t weight_val,
-                        int level):
-    cdef QuadTreeNode *node
-    cdef int i, j
-    node = <QuadTreeNode *> malloc(sizeof(QuadTreeNode))
-    node.pos[0] = pos[0]
-    node.pos[1] = pos[1]
-    node.nvals = nvals
-    node.val = <np.float64_t *> malloc(
-                nvals * sizeof(np.float64_t))
-    for i in range(nvals):
-        node.val[i] = val[i]
-    node.weight_val = weight_val
-    for i in range(2):
-        for j in range(2):
-            node.children[i][j] = NULL
-    node.level = level
-    return node
-
-cdef void QTN_free(QuadTreeNode *node):
-    cdef int i, j
-    for i in range(2):
-        for j in range(2):
-            if node.children[i][j] == NULL: continue
-            QTN_free(node.children[i][j])
-    free(node.val)
-    free(node)
-
-cdef class QuadTree:
-    cdef int nvals
-    cdef np.int64_t po2[80]
-    cdef QuadTreeNode ***root_nodes
-    cdef np.int64_t top_grid_dims[2]
-
-    def __cinit__(self, np.ndarray[np.int64_t, ndim=1] top_grid_dims,
-                  int nvals):
-        cdef int i, j
-        cdef QuadTreeNode *node
-        cdef np.int64_t pos[2]
-        cdef np.float64_t *vals = <np.float64_t *> alloca(
-                sizeof(np.float64_t)*nvals)
-        cdef np.float64_t weight_val = 0.0
-        self.nvals = nvals
-        for i in range(nvals): vals[i] = 0.0
-
-        self.top_grid_dims[0] = top_grid_dims[0]
-        self.top_grid_dims[1] = top_grid_dims[1]
-
-        # This wouldn't be necessary if we did bitshifting...
-        for i in range(80):
-            self.po2[i] = 2**i
-        self.root_nodes = <QuadTreeNode ***> \
-            malloc(sizeof(QuadTreeNode **) * top_grid_dims[0])
-
-        # We initialize our root values to 0.0.
-        for i in range(top_grid_dims[0]):
-            pos[0] = i
-            self.root_nodes[i] = <QuadTreeNode **> \
-                malloc(sizeof(QuadTreeNode *) * top_grid_dims[1])
-            for j in range(top_grid_dims[1]):
-                pos[1] = j
-                self.root_nodes[i][j] = QTN_initialize(
-                    pos, nvals, vals, weight_val, 0)
-
-    cdef void add_to_position(self,
-                 int level, np.int64_t pos[2],
-                 np.float64_t *val,
-                 np.float64_t weight_val):
-        cdef int i, j
-        cdef QuadTreeNode *node
-        node = self.find_on_root_level(pos, level)
-        cdef np.int64_t fac
-        for L in range(level):
-            if node.children[0][0] == NULL:
-                QTN_refine(node)
-            # Maybe we should use bitwise operators?
-            fac = self.po2[level - L - 1]
-            i = (pos[0] >= fac*(2*node.pos[0]+1))
-            j = (pos[1] >= fac*(2*node.pos[1]+1))
-            node = node.children[i][j]
-        QTN_add_value(node, val, weight_val)
-            
-    cdef QuadTreeNode *find_on_root_level(self, np.int64_t pos[2], int level):
-        # We need this because the root level won't just have four children
-        # So we find on the root level, then we traverse the tree.
-        cdef np.int64_t i, j
-        i = <np.int64_t> (pos[0] / self.po2[level])
-        j = <np.int64_t> (pos[1] / self.po2[level])
-        return self.root_nodes[i][j]
-        
-    
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    def add_array_to_tree(self, int level,
-            np.ndarray[np.int64_t, ndim=1] pxs,
-            np.ndarray[np.int64_t, ndim=1] pys,
-            np.ndarray[np.float64_t, ndim=2] pvals,
-            np.ndarray[np.float64_t, ndim=1] pweight_vals):
-        cdef int np = pxs.shape[0]
-        cdef int p
-        cdef cnp.float64_t *vals
-        cdef cnp.float64_t *data = <cnp.float64_t *> pvals.data
-        cdef cnp.int64_t pos[2]
-        for p in range(np):
-            vals = data + self.nvals*p
-            pos[0] = pxs[p]
-            pos[1] = pys[p]
-            self.add_to_position(level, pos, vals, pweight_vals[p])
-
-    def add_grid_to_tree(self, int level,
-                         np.ndarray[np.int64_t, ndim=1] start_index,
-                         np.ndarray[np.float64_t, ndim=2] pvals,
-                         np.ndarray[np.float64_t, ndim=2] wvals,
-                         np.ndarray[np.int32_t, ndim=2] cm):
-        pass
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    def get_all_from_level(self, int level, int count_only = 0):
-        cdef int i, j
-        cdef int total = 0
-        vals = []
-        for i in range(self.top_grid_dims[0]):
-            for j in range(self.top_grid_dims[1]):
-                total += self.count_at_level(self.root_nodes[i][j], level)
-        if count_only: return total
-        # Allocate our array
-        cdef np.ndarray[np.int64_t, ndim=2] npos
-        cdef np.ndarray[np.float64_t, ndim=2] nvals
-        cdef np.ndarray[np.float64_t, ndim=1] nwvals
-        npos = np.zeros( (total, 2), dtype='int64')
-        nvals = np.zeros( (total, self.nvals), dtype='float64')
-        nwvals = np.zeros( total, dtype='float64')
-        cdef np.int64_t curpos = 0
-        cdef np.int64_t *pdata = <np.int64_t *> npos.data
-        cdef np.float64_t *vdata = <np.float64_t *> nvals.data
-        cdef np.float64_t *wdata = <np.float64_t *> nwvals.data
-        for i in range(self.top_grid_dims[0]):
-            for j in range(self.top_grid_dims[1]):
-                curpos += self.fill_from_level(self.root_nodes[i][j],
-                    level, curpos, pdata, vdata, wdata)
-        return npos, nvals, nwvals
-
-    cdef int count_at_level(self, QuadTreeNode *node, int level):
-        cdef int i, j
-        # We only really return a non-zero, calculated value if we are at the
-        # level in question.
-        if node.level == level:
-            # We return 1 if there are no finer points at this level and zero
-            # if there are
-            return (node.children[0][0] == NULL)
-        if node.children[0][0] == NULL: return 0
-        cdef int count = 0
-        for i in range(2):
-            for j in range(2):
-                count += self.count_at_level(node.children[i][j], level)
-        return count
-
-    cdef int fill_from_level(self, QuadTreeNode *node, int level,
-                              np.int64_t curpos,
-                              np.int64_t *pdata,
-                              np.float64_t *vdata,
-                              np.float64_t *wdata):
-        cdef int i, j
-        if node.level == level:
-            if node.children[0][0] != NULL: return 0
-            for i in range(self.nvals):
-                vdata[self.nvals * curpos + i] = node.val[i]
-            wdata[curpos] = node.weight_val
-            pdata[curpos * 2] = node.pos[0]
-            pdata[curpos * 2 + 1] = node.pos[1]
-            return 1
-        if node.children[0][0] == NULL: return 0
-        cdef np.int64_t added = 0
-        for i in range(2):
-            for j in range(2):
-                added += self.fill_from_level(node.children[i][j],
-                        level, curpos + added, pdata, vdata, wdata)
-        return added
-
-    def __dealloc__(self):
-        cdef int i, j
-        for i in range(self.top_grid_dims[0]):
-            for j in range(self.top_grid_dims[1]):
-                QTN_free(self.root_nodes[i][j])
-            free(self.root_nodes[i])
-        free(self.root_nodes)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/RayIntegrators.pyx
--- a/yt/_amr_utils/RayIntegrators.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,374 +0,0 @@
-"""
-Simle integrators for the radiative transfer equation
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-import numpy as np
-cimport numpy as np
-cimport cython
-from stdlib cimport malloc, free, abs
-
-cdef extern from "math.h":
-    double exp(double x)
-    float expf(float x)
-
-@cython.boundscheck(False)
-def Transfer3D(np.ndarray[np.float64_t, ndim=3] i_s,
-               np.ndarray[np.float64_t, ndim=4] o_s,
-               np.ndarray[np.float64_t, ndim=4] e,
-               np.ndarray[np.float64_t, ndim=4] a,
-               int imin, int imax, int jmin, int jmax,
-               int kmin, int kmax, int istride, int jstride,
-               np.float64_t dx):
-    """
-    This function accepts an incoming slab (*i_s*), a buffer
-    for an outgoing set of values at every point in the grid (*o_s*),
-    an emission array (*e*), an absorption array (*a*), and dimensions of
-    the grid (*imin*, *imax*, *jmin*, *jmax*, *kmin*, *kmax*) as well
-    as strides in the *i* and *j* directions, and a *dx* of the grid being
-    integrated.
-    """
-    cdef int i, ii
-    cdef int j, jj
-    cdef int k, kk
-    cdef int n, nn
-    nn = o_s.shape[3] # This might be slow
-    cdef np.float64_t *temp = <np.float64_t *>malloc(sizeof(np.float64_t) * nn)
-    for i in range((imax-imin)*istride):
-        ii = i + imin*istride
-        for j in range((jmax-jmin)*jstride):
-            jj = j + jmin*jstride
-            # Not sure about the ordering of the loops here
-            for n in range(nn):
-                temp[n] = i_s[ii,jj,n] 
-            for k in range(kmax-kmin):
-                kk = k + kmin#*kstride, which doesn't make any sense
-                for n in range(nn):
-                    o_s[i,j,k,n] = temp[n] + dx*(e[i,j,k,n] - temp[n]*a[i,j,k,n])
-                    temp[n] = o_s[i,j,k,n]
-            for n in range(nn):
-                i_s[ii,jj,n] = temp[n]
-    free(temp)
-
-@cython.boundscheck(False)
-def TransferShells(np.ndarray[np.float64_t, ndim=3] i_s,
-                   np.ndarray[np.float64_t, ndim=3] data,
-                   np.ndarray[np.float64_t, ndim=2] shells):
-    """
-    This function accepts an incoming slab (*i_s*), a buffer of *data*,
-    and a list of shells specified as [ (value, tolerance, r, g, b), ... ].
-    """
-    cdef int i, ii
-    cdef int j, jj
-    cdef int k, kk
-    cdef int n, nn
-    cdef np.float64_t dist
-    ii = data.shape[0]
-    jj = data.shape[1]
-    kk = data.shape[2]
-    nn = shells.shape[0]
-    cdef float rgba[4]
-    cdef float alpha
-    for i in range(ii):
-        for j in range(jj):
-            # Not sure about the ordering of the loops here
-            for k in range(kk):
-                for n in range(nn):
-                    dist = shells[n, 0] - data[i,j,k]
-                    if dist < 0: dist *= -1.0
-                    if dist < shells[n,1]:
-                        dist = exp(-dist/8.0)
-                        rgba[0] = shells[n,2]
-                        rgba[1] = shells[n,3]
-                        rgba[2] = shells[n,4]
-                        rgba[3] = shells[n,5]
-                        alpha = i_s[i,j,3]
-                        dist *= dist # This might improve appearance
-                        i_s[i,j,0] += (1.0 - alpha)*rgba[0]*dist*rgba[3]
-                        i_s[i,j,1] += (1.0 - alpha)*rgba[1]*dist*rgba[3]
-                        i_s[i,j,2] += (1.0 - alpha)*rgba[2]*dist*rgba[3]
-                        i_s[i,j,3] += (1.0 - alpha)*rgba[3]*dist*rgba[3]
-                        break
-
-@cython.boundscheck(False)
-def Transfer1D(float i_s,
-               np.ndarray[np.float_t, ndim=1] o_s,
-               np.ndarray[np.float_t, ndim=1] e,
-               np.ndarray[np.float_t, ndim=1] a,
-               np.ndarray[np.float_t, ndim=1] dx,
-               int imin, int imax):
-    cdef int i
-    for i in range(imin, imax):
-        o_s[i] = i_s + dx[i]*(e[i] - i_s*a[i])
-        i_s = o_s[i]
-    return i_s
-
-@cython.wraparound(False)
-@cython.boundscheck(False)
-def VoxelTraversal(np.ndarray[np.int_t, ndim=3] grid_mask,
-                   np.ndarray[np.float64_t, ndim=3] grid_t,
-                   np.ndarray[np.float64_t, ndim=3] grid_dt,
-                   np.ndarray[np.float64_t, ndim=1] left_edge,
-                   np.ndarray[np.float64_t, ndim=1] right_edge,
-                   np.ndarray[np.float64_t, ndim=1] dx,
-                   np.ndarray[np.float64_t, ndim=1] u,
-                   np.ndarray[np.float64_t, ndim=1] v):
-    # We're roughly following Amanatides & Woo
-    # Find the first place the ray hits the grid on its path
-    # Do left edge then right edge in each dim
-    cdef int i, x, y
-    cdef np.float64_t tl, tr, intersect_t, enter_t, exit_t, dt_tolerance
-    cdef np.ndarray[np.int64_t,   ndim=1] step = np.empty((3,), dtype=np.int64)
-    cdef np.ndarray[np.int64_t,   ndim=1] cur_ind = np.empty((3,), dtype=np.int64)
-    cdef np.ndarray[np.float64_t, ndim=1] tdelta = np.empty((3,), dtype=np.float64)
-    cdef np.ndarray[np.float64_t, ndim=1] tmax = np.empty((3,), dtype=np.float64)
-    cdef np.ndarray[np.float64_t, ndim=1] intersect = np.empty((3,), dtype=np.float64)
-    intersect_t = 1
-    dt_tolerance = 1e-6
-    # recall p = v * t + u
-    #  where p is position, v is our vector, u is the start point
-    for i in range(3):
-        # As long as we're iterating, set some other stuff, too
-        if(v[i] < 0): step[i] = -1
-        else: step[i] = 1
-        x = (i+1)%3
-        y = (i+2)%3
-        tl = (left_edge[i] - u[i])/v[i]
-        tr = (right_edge[i] - u[i])/v[i]
-        if (left_edge[x] <= (u[x] + tl*v[x]) <= right_edge[x]) and \
-           (left_edge[y] <= (u[y] + tl*v[y]) <= right_edge[y]) and \
-           (0.0 <= tl < intersect_t):
-            intersect_t = tl
-        if (left_edge[x] <= (u[x] + tr*v[x]) <= right_edge[x]) and \
-           (left_edge[y] <= (u[y] + tr*v[y]) <= right_edge[y]) and \
-           (0.0 <= tr < intersect_t):
-            intersect_t = tr
-    # if fully enclosed
-    if (left_edge[0] <= u[0] <= right_edge[0]) and \
-       (left_edge[1] <= u[1] <= right_edge[1]) and \
-       (left_edge[2] <= u[2] <= right_edge[2]):
-        intersect_t = 0.0
-    if not (0 <= intersect_t <= 1): return
-    # Now get the indices of the intersection
-    intersect = u + intersect_t * v
-    for i in range(3):
-        cur_ind[i] = np.floor((intersect[i] + 1e-8*dx[i] - left_edge[i])/dx[i])
-        tmax[i] = (((cur_ind[i]+step[i])*dx[i])+left_edge[i]-u[i])/v[i]
-        if cur_ind[i] == grid_mask.shape[i] and step[i] < 0:
-            cur_ind[i] = grid_mask.shape[i] - 1
-        if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]
-        if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
-        tdelta[i] = (dx[i]/v[i])
-        if tdelta[i] < 0: tdelta[i] *= -1
-    # The variable intersect contains the point we first pierce the grid
-    enter_t = intersect_t
-    while 1:
-        if (not (0 <= cur_ind[0] < grid_mask.shape[0])) or \
-           (not (0 <= cur_ind[1] < grid_mask.shape[1])) or \
-           (not (0 <= cur_ind[2] < grid_mask.shape[2])):
-            break
-        # Note that we are calculating t on the fly, but we get *negative* t
-        # values from what they should be.
-        # If we've reached t = 1, we are done.
-        grid_mask[cur_ind[0], cur_ind[1], cur_ind[2]] = 1
-        if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
-            grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = 1.0 - enter_t
-            break
-        if tmax[0] < tmax[1]:
-            if tmax[0] < tmax[2]:
-                grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
-                grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[0] - enter_t
-                enter_t = tmax[0]
-                tmax[0] += tdelta[0]
-                cur_ind[0] += step[0]
-            else:
-                grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
-                grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[2] - enter_t
-                enter_t = tmax[2]
-                tmax[2] += tdelta[2]
-                cur_ind[2] += step[2]
-        else:
-            if tmax[1] < tmax[2]:
-                grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
-                grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[1] - enter_t
-                enter_t = tmax[1]
-                tmax[1] += tdelta[1]
-                cur_ind[1] += step[1]
-            else:
-                grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
-                grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[2] - enter_t
-                enter_t = tmax[2]
-                tmax[2] += tdelta[2]
-                cur_ind[2] += step[2]
-    return
-
-@cython.wraparound(False)
-@cython.boundscheck(False)
-def PlaneVoxelIntegration(np.ndarray[np.float64_t, ndim=1] left_edge,
-                          np.ndarray[np.float64_t, ndim=1] right_edge,
-                          np.ndarray[np.float64_t, ndim=1] dx,
-                          np.ndarray[np.float64_t, ndim=2] ug,
-                          np.ndarray[np.float64_t, ndim=1] v,
-                          np.ndarray[np.float64_t, ndim=2] image,
-                          np.ndarray[np.float64_t, ndim=3] data,
-                          np.ndarray[np.float64_t, ndim=2] shells):
-    # We're roughly following Amanatides & Woo on a ray-by-ray basis
-    # Note that for now it's just shells, but this can and should be
-    # generalized to transfer functions
-    cdef int i, x, y, vi
-    intersect_t = 1
-    dt_tolerance = 1e-6
-    cdef int nv = ug.shape[0]
-    cdef int nshells = shells.shape[0]
-    cdef np.ndarray[np.float64_t, ndim=1] u = np.empty((3,), dtype=np.float64)
-    # Copy things into temporary location for passing between functions
-    for vi in range(nv):
-        for i in range(3): u[i] = ug[vi, i]
-        integrate_ray(u, v, left_edge, right_edge, dx, 
-                      nshells, vi, data, shells, image)
-
-@cython.wraparound(False)
-@cython.boundscheck(False)
-def integrate_ray(np.ndarray[np.float64_t, ndim=1] u,
-                  np.ndarray[np.float64_t, ndim=1] v,
-                  np.ndarray[np.float64_t, ndim=1] left_edge,
-                  np.ndarray[np.float64_t, ndim=1] right_edge,
-                  np.ndarray[np.float64_t, ndim=1] dx,
-                  int nshells, int ind,
-                  np.ndarray[np.float64_t, ndim=3] data,
-                  np.ndarray[np.float64_t, ndim=2] shells,
-                  np.ndarray[np.float64_t, ndim=2] image):
-    cdef int step[3], x, y, i, n
-    cdef np.float64_t intersect_t = 1
-    cdef np.float64_t dt_tolerance = 1e-6
-    cdef np.float64_t tl, tr, enter_t, exit_t
-    cdef np.int64_t cur_ind[3]
-    cdef np.float64_t tdelta[3]
-    cdef np.float64_t tmax[3]
-    cdef np.float64_t intersect[3]
-    cdef np.float64_t dt, dv
-    cdef np.float64_t dist, alpha
-    cdef np.float64_t one = 1.0
-    cdef int dims[3]
-    cdef np.float64_t rgba[4], temp_x, temp_y
-    for i in range(3):
-        # As long as we're iterating, set some other stuff, too
-        dims[i] = data.shape[i]
-        if(v[i] < 0): step[i] = -1
-        else: step[i] = 1
-        x = (i+1)%3
-        y = (i+2)%3
-        tl = (left_edge[i] - u[i])/v[i]
-        tr = (right_edge[i] - u[i])/v[i]
-        temp_x = (u[x] + tl*v[x])
-        temp_y = (u[y] + tl*v[y])
-        if (left_edge[x] <= temp_x) and (temp_x <= right_edge[x]) and \
-           (left_edge[y] <= temp_y) and (temp_y <= right_edge[y]) and \
-           (0.0 <= tl) and (tl < intersect_t):
-            intersect_t = tl
-        temp_x = (u[x] + tr*v[x])
-        temp_y = (u[y] + tr*v[y])
-        if (left_edge[x] <= temp_x) and (temp_x <= right_edge[x]) and \
-           (left_edge[y] <= temp_y) and (temp_y <= right_edge[y]) and \
-           (0.0 <= tr) and (tr < intersect_t):
-            intersect_t = tr
-    # if fully enclosed
-    if (left_edge[0] <= u[0] <= right_edge[0]) and \
-       (left_edge[1] <= u[1] <= right_edge[1]) and \
-       (left_edge[2] <= u[2] <= right_edge[2]):
-        intersect_t = 0.0
-    if not (0 <= intersect_t <= 1):
-        #print "Returning: intersect_t ==", intersect_t
-        return
-    # Now get the indices of the intersection
-    for i in range(3): intersect[i] = u[i] + intersect_t * v[i]
-    cdef int ncells = 0
-    for i in range(3):
-        cur_ind[i] = np.floor((intersect[i] + 1e-8*dx[i] - left_edge[i])/dx[i])
-        tmax[i] = (((cur_ind[i]+step[i])*dx[i])+left_edge[i]-u[i])/v[i]
-        if cur_ind[i] == dims[i] and step[i] < 0:
-            cur_ind[i] = dims[i] - 1
-        if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]
-        if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
-        tdelta[i] = (dx[i]/v[i])
-        if tdelta[i] < 0: tdelta[i] *= -1
-    # The variable intersect contains the point we first pierce the grid
-    enter_t = intersect_t
-    if (not (0 <= cur_ind[0] < dims[0])) or \
-       (not (0 <= cur_ind[1] < dims[1])) or \
-       (not (0 <= cur_ind[2] < dims[2])):
-        #print "Returning: cur_ind", cur_ind[0], cur_ind[1], cur_ind[2]
-        #print "  dims:     ", dims[0], dims[1], dims[2]
-        #print "  intersect:",  intersect[0], intersect[1], intersect[2]
-        #print "  intersect:", intersect_t
-        #print "  u        :", u[0], u[1], u[2]
-        #
-        return
-    #print cur_ind[0], dims[0], cur_ind[1], dims[1], cur_ind[2], dims[2]
-    dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]
-    #dt = 1e300
-    while 1:
-        if image[ind,3] >= 1.0: break
-        if (not (0 <= cur_ind[0] < dims[0])) or \
-           (not (0 <= cur_ind[1] < dims[1])) or \
-           (not (0 <= cur_ind[2] < dims[2])):
-            break
-        # Do our transfer here
-        for n in range(nshells):
-            dist = shells[n, 0] - dv
-            if dist < shells[n,1]:
-                dist = exp(-dist/8.0)
-                alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
-                image[ind,0] += alpha*shells[n,2]*dist
-                image[ind,1] += alpha*shells[n,3]*dist
-                image[ind,2] += alpha*shells[n,4]*dist
-                image[ind,3] += alpha*shells[n,5]*dist
-                #image[ind,i] += rgba[i]*dist*rgba[3]/dt
-                #print rgba[i], image[ind,i], dist, dt
-                break
-        if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
-            dt = 1.0 - enter_t
-            break
-        if tmax[0] < tmax[1]:
-            if tmax[0] < tmax[2]:
-                dt = tmax[0] - enter_t
-                enter_t = tmax[0]
-                tmax[0] += tdelta[0]
-                cur_ind[0] += step[0]
-            else:
-                dt = tmax[2] - enter_t
-                enter_t = tmax[2]
-                tmax[2] += tdelta[2]
-                cur_ind[2] += step[2]
-        else:
-            if tmax[1] < tmax[2]:
-                dt = tmax[1] - enter_t
-                enter_t = tmax[1]
-                tmax[1] += tdelta[1]
-                cur_ind[1] += step[1]
-            else:
-                dt = tmax[2] - enter_t
-                enter_t = tmax[2]
-                tmax[2] += tdelta[2]
-                cur_ind[2] += step[2]
-        dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/VolumeIntegrator.pyx
--- a/yt/_amr_utils/VolumeIntegrator.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,656 +0,0 @@
-"""
-Simple integrators for the radiative transfer equation
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2009 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-import numpy as np
-cimport numpy as np
-cimport cython
-from stdlib cimport malloc, free, abs
-
-cdef inline int imax(int i0, int i1):
-    if i0 > i1: return i0
-    return i1
-
-cdef inline np.float64_t fmax(np.float64_t f0, np.float64_t f1):
-    if f0 > f1: return f0
-    return f1
-
-cdef inline int imin(int i0, int i1):
-    if i0 < i1: return i0
-    return i1
-
-cdef inline np.float64_t fmin(np.float64_t f0, np.float64_t f1):
-    if f0 < f1: return f0
-    return f1
-
-cdef inline int iclip(int i, int a, int b):
-    if i < a: return a
-    if i > b: return b
-    return i
-
-cdef inline np.float64_t fclip(np.float64_t f,
-                      np.float64_t a, np.float64_t b):
-    return fmin(fmax(f, a), b)
-
-cdef extern from "math.h":
-    double exp(double x)
-    float expf(float x)
-    double floor(double x)
-    double ceil(double x)
-    double fmod(double x, double y)
-    double log2(double x)
-    long int lrint(double x)
-
-cdef extern from "FixedInterpolator.h":
-    np.float64_t fast_interpolate(int ds[3], int ci[3], np.float64_t dp[3],
-                                  np.float64_t *data)
-    np.float64_t offset_interpolate(int ds[3], np.float64_t dp[3], np.float64_t *data)
-    np.float64_t trilinear_interpolate(int ds[3], int ci[3], np.float64_t dp[3],
-                                       np.float64_t *data)
-    np.float64_t eval_gradient(int *ds, int *ci, np.float64_t *dp,
-                                       np.float64_t *data, np.float64_t *grad)
-
-cdef class VectorPlane
-
-cdef struct FieldInterpolationTable:
-    # Note that we make an assumption about retaining a reference to values
-    # externally.
-    np.float64_t *values 
-    np.float64_t bounds[2]
-    np.float64_t dbin
-    np.float64_t idbin
-    int field_id
-    int weight_field_id
-    int weight_table_id
-    int nbins
-    int pass_through
-
-cdef void FIT_initialize_table(FieldInterpolationTable *fit, int nbins,
-              np.float64_t *values, np.float64_t bounds1, np.float64_t bounds2,
-              int field_id, int weight_field_id = -1, int weight_table_id = -1,
-              int pass_through = 0):
-    fit.bounds[0] = bounds1; fit.bounds[1] = bounds2
-    fit.nbins = nbins
-    fit.dbin = (fit.bounds[1] - fit.bounds[0])/fit.nbins
-    fit.idbin = 1.0/fit.dbin
-    # Better not pull this out from under us, yo
-    fit.values = values
-    fit.field_id = field_id
-    fit.weight_field_id = weight_field_id
-    fit.weight_table_id = weight_table_id
-    fit.pass_through = pass_through
-
-cdef np.float64_t FIT_get_value(FieldInterpolationTable *fit,
-                            np.float64_t *dvs):
-    cdef np.float64_t bv, dy, dd, tf
-    cdef int bin_id
-    if fit.pass_through == 1: return dvs[fit.field_id]
-    if dvs[fit.field_id] > fit.bounds[1] or dvs[fit.field_id] < fit.bounds[0]: return 0.0
-    bin_id = <int> ((dvs[fit.field_id] - fit.bounds[0]) * fit.idbin)
-    dd = dvs[fit.field_id] - (fit.bounds[0] + bin_id * fit.dbin) # x - x0
-    bv = fit.values[bin_id]
-    dy = fit.values[bin_id + 1] - bv
-    if fit.weight_field_id != -1:
-        return dvs[fit.weight_field_id] * (bv + dd*dy*fit.idbin)
-    return (bv + dd*dy*fit.idbin)
-
-cdef class TransferFunctionProxy:
-    cdef int n_fields
-    cdef int n_field_tables
-    cdef public int ns
-
-    # These are the field tables and their affiliated storage.
-    # We have one field_id for every table.  Note that a single field can
-    # correspond to multiple tables, and each field table will only have
-    # interpolate called once.
-    cdef FieldInterpolationTable field_tables[6]
-    cdef np.float64_t istorage[6]
-
-    # Here are the field tables that correspond to each of the six channels.
-    # We have three emission channels, three absorption channels.
-    cdef int field_table_ids[6]
-
-    # We store a reference to the transfer function object and to the field
-    # interpolation tables
-    cdef public object tf_obj
-    cdef public object my_field_tables
-
-    def __cinit__(self, tf_obj):
-        # We have N fields.  We have 6 channels.  We have M field tables.
-        # The idea is that we can have multiple channels corresponding to the
-        # same field table.  So, we create storage for the outputs from all the
-        # field tables.  We need to know which field value to pass in to the
-        # field table, and we need to know which table to use for each of the
-        # six channels.
-        cdef int i
-        cdef np.ndarray[np.float64_t, ndim=1] temp
-        cdef FieldInterpolationTable fit
-
-        self.tf_obj = tf_obj
-
-        self.n_field_tables = tf_obj.n_field_tables
-        for i in range(6): self.istorage[i] = 0.0
-
-        self.my_field_tables = []
-        for i in range(self.n_field_tables):
-            temp = tf_obj.tables[i].y
-            FIT_initialize_table(&self.field_tables[i],
-                      temp.shape[0],
-                      <np.float64_t *> temp.data,
-                      tf_obj.tables[i].x_bounds[0],
-                      tf_obj.tables[i].x_bounds[1],
-                      tf_obj.field_ids[i], tf_obj.weight_field_ids[i],
-                      tf_obj.weight_table_ids[i],
-                      tf_obj.tables[i].pass_through)
-            self.my_field_tables.append((tf_obj.tables[i],
-                                         tf_obj.tables[i].y))
-            self.field_tables[i].field_id = tf_obj.field_ids[i]
-            self.field_tables[i].weight_field_id = tf_obj.weight_field_ids[i]
-            print "Field table", i, "corresponds to",
-            print self.field_tables[i].field_id,
-            print "(Weighted with ", self.field_tables[i].weight_field_id,
-            print ")"
-
-        for i in range(6):
-            self.field_table_ids[i] = tf_obj.field_table_ids[i]
-            print "Channel", i, "corresponds to", self.field_table_ids[i]
-            
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    cdef void eval_transfer(self, np.float64_t dt, np.float64_t *dvs,
-                                  np.float64_t *rgba, np.float64_t *grad):
-        cdef int i, fid, use
-        cdef np.float64_t ta, tf, trgba[6], dot_prod
-        # NOTE: We now disable this.  I have left it to ease the process of
-        # potentially, one day, re-including it.
-        #use = 0
-        #for i in range(self.n_field_tables):
-        #    fid = self.field_tables[i].field_id
-        #    if (dvs[fid] >= self.field_tables[i].bounds[0]) and \
-        #       (dvs[fid] <= self.field_tables[i].bounds[1]):
-        #        use = 1
-        #        break
-        for i in range(self.n_field_tables):
-            self.istorage[i] = FIT_get_value(&self.field_tables[i], dvs)
-        # We have to do this after the interpolation
-        for i in range(self.n_field_tables):
-            fid = self.field_tables[i].weight_table_id
-            if fid != -1: self.istorage[i] *= self.istorage[fid]
-        for i in range(6):
-            trgba[i] = self.istorage[self.field_table_ids[i]]
-            #print i, trgba[i],
-        #print
-        # A few words on opacity.  We're going to be integrating equation 1.23
-        # from Rybicki & Lightman.  dI_\nu / ds = -\alpha_\nu I_\nu + j_\nu
-        # \alpha_nu = \kappa \rho , but we leave that up to the input
-        # transfer function.
-        # SOoooooOOOooo, the upshot is that we are doing a rectangular
-        # integration here:
-        #   I_{i+1} = ds * C_i + (1.0 - ds*alpha_i) * I_i
-        for i in range(3):
-            # This is the new way: alpha corresponds to opacity of a given
-            # slice.  Previously it was ill-defined, but represented some
-            # measure of emissivity.
-            ta = fmax((1.0 - dt*trgba[i+3]), 0.0)
-            rgba[i  ] = dt*trgba[i  ] + ta * rgba[i  ]
-            #rgba[i+3] = dt*trgba[i+3] + ta * rgba[i+3]
-            # This is the old way:
-            #rgba[i  ] += trgba[i] * (1.0 - rgba[i+3])*dt*trgba[i+3]
-            #rgba[i+3] += trgba[i] * (1.0 - rgba[i+3])*dt*trgba[i+3]
-
-cdef class VectorPlane:
-    cdef public object avp_pos, avp_dir, acenter, aimage
-    cdef np.float64_t *vp_pos, *vp_dir, *center, *image,
-    cdef np.float64_t pdx, pdy, bounds[4]
-    cdef int nv[2]
-    cdef int vp_strides[3]
-    cdef int im_strides[3]
-    cdef int vd_strides[3]
-    cdef public object ax_vec, ay_vec
-    cdef np.float64_t *x_vec, *y_vec
-
-    def __cinit__(self, 
-                  np.ndarray[np.float64_t, ndim=3] vp_pos,
-                  np.ndarray vp_dir,
-                  np.ndarray[np.float64_t, ndim=1] center,
-                  bounds,
-                  np.ndarray[np.float64_t, ndim=3] image,
-                  np.ndarray[np.float64_t, ndim=1] x_vec,
-                  np.ndarray[np.float64_t, ndim=1] y_vec):
-        cdef int i, j
-        self.avp_pos = vp_pos
-        self.avp_dir = vp_dir
-        self.acenter = center
-        self.aimage = image
-        self.ax_vec = x_vec
-        self.ay_vec = y_vec
-        self.vp_pos = <np.float64_t *> vp_pos.data
-        self.vp_dir = <np.float64_t *> vp_dir.data
-        self.center = <np.float64_t *> center.data
-        self.image = <np.float64_t *> image.data
-        self.x_vec = <np.float64_t *> x_vec.data
-        self.y_vec = <np.float64_t *> y_vec.data
-        self.nv[0] = vp_pos.shape[0]
-        self.nv[1] = vp_pos.shape[1]
-        for i in range(4): self.bounds[i] = bounds[i]
-        self.pdx = (self.bounds[1] - self.bounds[0])/self.nv[0]
-        self.pdy = (self.bounds[3] - self.bounds[2])/self.nv[1]
-        for i in range(3):
-            self.vp_strides[i] = vp_pos.strides[i] / 8
-            self.im_strides[i] = image.strides[i] / 8
-        if vp_dir.ndim > 1:
-            for i in range(3):
-                self.vd_strides[i] = vp_dir.strides[i] / 8
-        else:
-            self.vd_strides[0] = self.vd_strides[1] = self.vd_strides[2] = -1
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    cdef void get_start_stop(self, np.float64_t *ex, int *rv):
-        # Extrema need to be re-centered
-        cdef np.float64_t cx, cy
-        cdef int i
-        cx = cy = 0.0
-        for i in range(3):
-            cx += self.center[i] * self.x_vec[i]
-            cy += self.center[i] * self.y_vec[i]
-        rv[0] = lrint((ex[0] - cx - self.bounds[0])/self.pdx)
-        rv[1] = rv[0] + lrint((ex[1] - ex[0])/self.pdx)
-        rv[2] = lrint((ex[2] - cy - self.bounds[2])/self.pdy)
-        rv[3] = rv[2] + lrint((ex[3] - ex[2])/self.pdy)
-
-    cdef inline void copy_into(self, np.float64_t *fv, np.float64_t *tv,
-                        int i, int j, int nk, int strides[3]):
-        # We know the first two dimensions of our from-vector, and our
-        # to-vector is flat and 'ni' long
-        cdef int k
-        cdef int offset = strides[0] * i + strides[1] * j
-        for k in range(nk):
-            tv[k] = fv[offset + k]
-
-    cdef inline void copy_back(self, np.float64_t *fv, np.float64_t *tv,
-                        int i, int j, int nk, int strides[3]):
-        cdef int k
-        cdef int offset = strides[0] * i + strides[1] * j
-        for k in range(nk):
-            tv[offset + k] = fv[k]
-
-cdef class PartitionedGrid:
-    cdef public object my_data
-    cdef public object LeftEdge
-    cdef public object RightEdge
-    cdef np.float64_t *data[6]
-    cdef np.float64_t dvs[6]
-    cdef np.float64_t left_edge[3]
-    cdef np.float64_t right_edge[3]
-    cdef np.float64_t dds[3]
-    cdef np.float64_t idds[3]
-    cdef int dims[3]
-    cdef public int parent_grid_id
-    cdef public int n_fields
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    def __cinit__(self,
-                  int parent_grid_id, int n_fields, data,
-                  np.ndarray[np.float64_t, ndim=1] left_edge,
-                  np.ndarray[np.float64_t, ndim=1] right_edge,
-                  np.ndarray[np.int64_t, ndim=1] dims):
-        # The data is likely brought in via a slice, so we copy it
-        cdef int i, j, k, size
-        cdef np.ndarray[np.float64_t, ndim=3] tdata
-        self.parent_grid_id = parent_grid_id
-        self.LeftEdge = left_edge
-        self.RightEdge = right_edge
-        for i in range(3):
-            self.left_edge[i] = left_edge[i]
-            self.right_edge[i] = right_edge[i]
-            self.dims[i] = dims[i]
-            self.dds[i] = (self.right_edge[i] - self.left_edge[i])/dims[i]
-            self.idds[i] = 1.0/self.dds[i]
-        self.my_data = data
-        self.n_fields = n_fields
-        for i in range(n_fields):
-            tdata = data[i]
-            self.data[i] = <np.float64_t *> tdata.data
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    def cast_plane(self, TransferFunctionProxy tf, VectorPlane vp):
-        # This routine will iterate over all of the vectors and cast each in
-        # turn.  Might benefit from a more sophisticated intersection check,
-        # like http://courses.csusm.edu/cs697exz/ray_box.htm
-        cdef int vi, vj, hit, i, ni, nj, nn
-        cdef int iter[4]
-        cdef np.float64_t v_pos[3], v_dir[3], rgba[6], extrema[4]
-        hit = 0
-        self.calculate_extent(vp, extrema)
-        vp.get_start_stop(extrema, iter)
-        iter[0] = iclip(iter[0], 0, vp.nv[0])
-        iter[1] = iclip(iter[1], 0, vp.nv[0])
-        iter[2] = iclip(iter[2], 0, vp.nv[1])
-        iter[3] = iclip(iter[3], 0, vp.nv[1])
-        if vp.vd_strides[0] == -1:
-            for vi in range(iter[0], iter[1]):
-                for vj in range(iter[2], iter[3]):
-                    vp.copy_into(vp.vp_pos, v_pos, vi, vj, 3, vp.vp_strides)
-                    vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
-                    self.integrate_ray(v_pos, vp.vp_dir, rgba, tf)
-                    vp.copy_back(rgba, vp.image, vi, vj, 3, vp.im_strides)
-        else:
-            # If we do not have an orthographic projection, we have to cast all
-            # our rays (until we can get an extrema calculation...)
-            for vi in range(vp.nv[0]):
-                for vj in range(vp.nv[1]):
-                    vp.copy_into(vp.vp_pos, v_pos, vi, vj, 3, vp.vp_strides)
-                    vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
-                    vp.copy_into(vp.vp_dir, v_dir, vi, vj, 3, vp.vd_strides)
-                    self.integrate_ray(v_pos, v_dir, rgba, tf)
-                    vp.copy_back(rgba, vp.image, vi, vj, 3, vp.im_strides)
-        return hit
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    cdef void calculate_extent(self, VectorPlane vp,
-                               np.float64_t extrema[4]):
-        # We do this for all eight corners
-        cdef np.float64_t *edges[2], temp
-        edges[0] = self.left_edge
-        edges[1] = self.right_edge
-        extrema[0] = extrema[2] = 1e300; extrema[1] = extrema[3] = -1e300
-        cdef int i, j, k
-        for i in range(2):
-            for j in range(2):
-                for k in range(2):
-                    # This should rotate it into the vector plane
-                    temp  = edges[i][0] * vp.x_vec[0]
-                    temp += edges[j][1] * vp.x_vec[1]
-                    temp += edges[k][2] * vp.x_vec[2]
-                    if temp < extrema[0]: extrema[0] = temp
-                    if temp > extrema[1]: extrema[1] = temp
-                    temp  = edges[i][0] * vp.y_vec[0]
-                    temp += edges[j][1] * vp.y_vec[1]
-                    temp += edges[k][2] * vp.y_vec[2]
-                    if temp < extrema[2]: extrema[2] = temp
-                    if temp > extrema[3]: extrema[3] = temp
-        #print extrema[0], extrema[1], extrema[2], extrema[3]
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    cdef int integrate_ray(self, np.float64_t v_pos[3],
-                                 np.float64_t v_dir[3],
-                                 np.float64_t rgba[4],
-                                 TransferFunctionProxy tf):
-        cdef int cur_ind[3], step[3], x, y, i, n, flat_ind, hit, direction
-        cdef np.float64_t intersect_t = 1.0
-        cdef np.float64_t iv_dir[3]
-        cdef np.float64_t intersect[3], tmax[3], tdelta[3]
-        cdef np.float64_t enter_t, dist, alpha, dt, exit_t
-        cdef np.float64_t tr, tl, temp_x, temp_y, dv
-        for i in range(3):
-            if (v_dir[i] < 0):
-                step[i] = -1
-            elif (v_dir[i] == 0):
-                step[i] = 1
-                tmax[i] = 1e60
-                iv_dir[i] = 1e60
-                tdelta[i] = 1e-60
-                continue
-            else:
-                step[i] = 1
-            x = (i+1) % 3
-            y = (i+2) % 3
-            iv_dir[i] = 1.0/v_dir[i]
-            tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
-            temp_x = (v_pos[x] + tl*v_dir[x])
-            temp_y = (v_pos[y] + tl*v_dir[y])
-            if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
-               self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
-               0.0 <= tl and tl < intersect_t:
-                direction = i
-                intersect_t = tl
-            tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
-            temp_x = (v_pos[x] + tr*v_dir[x])
-            temp_y = (v_pos[y] + tr*v_dir[y])
-            if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
-               self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
-               0.0 <= tr and tr < intersect_t:
-                direction = i
-                intersect_t = tr
-        if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
-           self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
-           self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
-            intersect_t = 0.0
-        if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
-        for i in range(3):
-            intersect[i] = v_pos[i] + intersect_t * v_dir[i]
-            cur_ind[i] = <int> floor((intersect[i] +
-                                      step[i]*1e-8*self.dds[i] -
-                                      self.left_edge[i])*self.idds[i])
-            tmax[i] = (((cur_ind[i]+step[i])*self.dds[i])+
-                        self.left_edge[i]-v_pos[i])*iv_dir[i]
-            # This deals with the asymmetry in having our indices refer to the
-            # left edge of a cell, but the right edge of the brick being one
-            # extra zone out.
-            if cur_ind[i] == self.dims[i] and step[i] < 0:
-                cur_ind[i] = self.dims[i] - 1
-            if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
-            if step[i] > 0:
-                tmax[i] = (((cur_ind[i]+1)*self.dds[i])
-                            +self.left_edge[i]-v_pos[i])*iv_dir[i]
-            if step[i] < 0:
-                tmax[i] = (((cur_ind[i]+0)*self.dds[i])
-                            +self.left_edge[i]-v_pos[i])*iv_dir[i]
-            tdelta[i] = (self.dds[i]*iv_dir[i])
-            if tdelta[i] < 0: tdelta[i] *= -1
-        # We have to jumpstart our calculation
-        enter_t = intersect_t
-        while 1:
-            # dims here is one less than the dimensions of the data,
-            # but we are tracing on the grid, not on the data...
-            if (not (0 <= cur_ind[0] < self.dims[0])) or \
-               (not (0 <= cur_ind[1] < self.dims[1])) or \
-               (not (0 <= cur_ind[2] < self.dims[2])):
-                break
-            hit += 1
-            if tmax[0] < tmax[1]:
-                if tmax[0] < tmax[2]:
-                    exit_t = fmin(tmax[0], 1.0)
-                    self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
-                                       rgba, tf)
-                    cur_ind[0] += step[0]
-                    enter_t = tmax[0]
-                    tmax[0] += tdelta[0]
-                else:
-                    exit_t = fmin(tmax[2], 1.0)
-                    self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
-                                       rgba, tf)
-                    cur_ind[2] += step[2]
-                    enter_t = tmax[2]
-                    tmax[2] += tdelta[2]
-            else:
-                if tmax[1] < tmax[2]:
-                    exit_t = fmin(tmax[1], 1.0)
-                    self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
-                                       rgba, tf)
-                    cur_ind[1] += step[1]
-                    enter_t = tmax[1]
-                    tmax[1] += tdelta[1]
-                else:
-                    exit_t = fmin(tmax[2], 1.0)
-                    self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
-                                       rgba, tf)
-                    cur_ind[2] += step[2]
-                    enter_t = tmax[2]
-                    tmax[2] += tdelta[2]
-            if enter_t > 1.0: break
-        return hit
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    cdef void sample_values(self,
-                            np.float64_t v_pos[3],
-                            np.float64_t v_dir[3],
-                            np.float64_t enter_t,
-                            np.float64_t exit_t,
-                            int ci[3],
-                            np.float64_t *rgba,
-                            TransferFunctionProxy tf):
-        cdef np.float64_t cp[3], dp[3], temp, dt, t, dv
-        cdef np.float64_t grad[3], ds[3]
-        grad[0] = grad[1] = grad[2] = 0.0
-        cdef int dti, i
-        dt = (exit_t - enter_t) / tf.ns # 4 samples should be dt=0.25
-        cdef int offset = ci[0] * (self.dims[1] + 1) * (self.dims[2] + 1) \
-                        + ci[1] * (self.dims[2] + 1) + ci[2]
-        for i in range(3):
-            # temp is the left edge of the current cell
-            temp = ci[i] * self.dds[i] + self.left_edge[i]
-            # this gets us dp as the current first sample position
-            dp[i] = (enter_t + 0.5 * dt) * v_dir[i] + v_pos[i] - temp
-            dp[i] *= self.idds[i]
-            ds[i] = v_dir[i] * self.idds[i] * dt
-        for dti in range(tf.ns): 
-            for i in range(self.n_fields):
-                self.dvs[i] = offset_interpolate(self.dims, dp, self.data[i] + offset)
-            #if (dv < tf.x_bounds[0]) or (dv > tf.x_bounds[1]):
-            #    continue
-            for i in range(3):
-                dp[i] += ds[i]
-            tf.eval_transfer(dt, self.dvs, rgba, grad)
-
-cdef class GridFace:
-    cdef int direction
-    cdef public np.float64_t coord
-    cdef np.float64_t left_edge[3]
-    cdef np.float64_t right_edge[3]
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    def __init__(self, grid, int direction, int left):
-        self.direction = direction
-        if left == 1:
-            self.coord = grid.LeftEdge[direction]
-        else:
-            self.coord = grid.RightEdge[direction]
-        cdef int i
-        for i in range(3):
-            self.left_edge[i] = grid.LeftEdge[i]
-            self.right_edge[i] = grid.RightEdge[i]
-        self.left_edge[direction] = self.right_edge[direction] = self.coord
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    cdef int proj_overlap(self, np.float64_t *left_edge, np.float64_t *right_edge):
-        cdef int xax, yax
-        xax = (self.direction + 1) % 3
-        yax = (self.direction + 2) % 3
-        if left_edge[xax] >= self.right_edge[xax]: return 0
-        if right_edge[xax] <= self.left_edge[xax]: return 0
-        if left_edge[yax] >= self.right_edge[yax]: return 0
-        if right_edge[yax] <= self.left_edge[yax]: return 0
-        return 1
-
-cdef class ProtoPrism:
-    cdef np.float64_t left_edge[3]
-    cdef np.float64_t right_edge[3]
-    cdef public object LeftEdge
-    cdef public object RightEdge
-    cdef public object subgrid_faces
-    cdef public int parent_grid_id
-    def __cinit__(self, int parent_grid_id,
-                  np.ndarray[np.float64_t, ndim=1] left_edge,
-                  np.ndarray[np.float64_t, ndim=1] right_edge,
-                  subgrid_faces):
-        self.parent_grid_id = parent_grid_id
-        cdef int i
-        self.LeftEdge = left_edge
-        self.RightEdge = right_edge
-        for i in range(3):
-            self.left_edge[i] = left_edge[i]
-            self.right_edge[i] = right_edge[i]
-        self.subgrid_faces = subgrid_faces
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    def sweep(self, int direction = 0, int stack = 0):
-        cdef int i
-        cdef GridFace face
-        cdef np.float64_t proto_split[3]
-        for i in range(3): proto_split[i] = self.right_edge[i]
-        for face in self.subgrid_faces[direction]:
-            proto_split[direction] = face.coord
-            if proto_split[direction] <= self.left_edge[direction]:
-                continue
-            if proto_split[direction] == self.right_edge[direction]:
-                if stack == 2: return [self]
-                return self.sweep((direction + 1) % 3, stack + 1)
-            if face.proj_overlap(self.left_edge, proto_split) == 1:
-                left, right = self.split(proto_split, direction)
-                LC = left.sweep((direction + 1) % 3)
-                RC = right.sweep(direction)
-                return LC + RC
-        raise RuntimeError
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    cdef object split(self, np.float64_t *sp, int direction):
-        cdef int i
-        cdef np.ndarray split_left = self.LeftEdge.copy()
-        cdef np.ndarray split_right = self.RightEdge.copy()
-
-        for i in range(3): split_left[i] = self.right_edge[i]
-        split_left[direction] = sp[direction]
-        left = ProtoPrism(self.parent_grid_id, self.LeftEdge, split_left,
-                          self.subgrid_faces)
-
-        for i in range(3): split_right[i] = self.left_edge[i]
-        split_right[direction] = sp[direction]
-        right = ProtoPrism(self.parent_grid_id, split_right, self.RightEdge,
-                           self.subgrid_faces)
-
-        return (left, right)
-
-    @cython.boundscheck(False)
-    @cython.wraparound(False)
-    def get_brick(self, np.ndarray[np.float64_t, ndim=1] grid_left_edge,
-                        np.ndarray[np.float64_t, ndim=1] grid_dds,
-                        child_mask):
-        # We get passed in the left edge, the dds (which gives dimensions) and
-        # the data, which is already vertex-centered.
-        cdef PartitionedGrid PG
-        cdef int li[3], ri[3], idims[3], i
-        for i in range(3):
-            li[i] = lrint((self.left_edge[i] - grid_left_edge[i])/grid_dds[i])
-            ri[i] = lrint((self.right_edge[i] - grid_left_edge[i])/grid_dds[i])
-            idims[i] = ri[i] - li[i]
-        if child_mask[li[0], li[1], li[2]] == 0: return []
-        cdef np.ndarray[np.int64_t, ndim=1] dims = np.empty(3, dtype='int64')
-        for i in range(3):
-            dims[i] = idims[i]
-        #cdef np.ndarray[np.float64_t, ndim=3] new_data
-        #new_data = data[li[0]:ri[0]+1,li[1]:ri[1]+1,li[2]:ri[2]+1].copy()
-        #PG = PartitionedGrid(self.parent_grid_id, new_data,
-        #                     self.LeftEdge, self.RightEdge, dims)
-        return ((li[0], ri[0]), (li[1], ri[1]), (li[2], ri[2]), dims)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/fortran_reader.pyx
--- a/yt/_amr_utils/fortran_reader.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,70 +0,0 @@
-"""
-Simple readers for fortran unformatted data, specifically for the Tiger code.
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: UCSD
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-import numpy as np
-cimport numpy as np
-cimport cython
-
-from stdio cimport fopen, fclose, FILE
-
-cdef extern from "stdio.h":
-    cdef int SEEK_SET
-    cdef int SEEK_CUR
-    cdef int SEEK_END
-    int fseek(FILE *stream, long offset, int whence)
-    size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
-    long ftell(FILE *stream)
-
-@cython.boundscheck(False)
-@cython.wraparound(False)
-def read_tiger_section(
-                     char *fn,
-                     np.ndarray[np.int64_t, ndim=1] slab_start,
-                     np.ndarray[np.int64_t, ndim=1] slab_size,
-                     np.ndarray[np.int64_t, ndim=1] root_size,
-                     int offset = 36):
-    cdef int strides[3]
-    strides[0] = 1
-    strides[1] = root_size[0] * strides[0]
-    strides[2] = strides[1] * root_size[1] + 2
-    cdef np.int64_t i, j, k
-    cdef np.ndarray buffer = np.zeros(slab_size, dtype='float32', order='F')
-    cdef FILE *f = fopen(fn, "rb")
-    #for i in range(3): offset += strides[i] * slab_start[i]
-    cdef np.int64_t pos = 0
-    cdef np.int64_t moff = 0
-    cdef float *data = <float *> buffer.data
-    fseek(f, offset, 0)
-    # If anybody wants to convert this loop to a SEEK_CUR, that'd be great.
-    for i in range(slab_size[2]):
-        for j in range(slab_size[1]):
-            moff = (slab_start[0]    ) * strides[0] \
-                 + (slab_start[1] + j) * strides[1] \
-                 + (slab_start[2] + i) * strides[2]
-            #print offset + 4 * moff, pos
-            fseek(f, offset + 4 * moff, SEEK_SET)
-            fread(<void *> (data + pos), 4, slab_size[0], f)
-            pos += slab_size[0]
-    return buffer
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/_amr_utils/png_writer.pyx
--- a/yt/_amr_utils/png_writer.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,170 +0,0 @@
-"""
-A light interface to libpng
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: UCSD
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-import numpy as np
-cimport numpy as np
-cimport cython
-
-from stdio cimport fopen, fclose, FILE
-
-cdef extern from "stdlib.h":
-    # NOTE that size_t might not be int
-    void *alloca(int)
-
-cdef extern from "png.h":
-    ctypedef unsigned long png_uint_32
-    ctypedef long png_int_32
-    ctypedef unsigned short png_uint_16
-    ctypedef short png_int_16
-    ctypedef unsigned char png_byte
-    ctypedef void            *png_voidp
-    ctypedef png_byte        *png_bytep
-    ctypedef png_uint_32     *png_uint_32p
-    ctypedef png_int_32      *png_int_32p
-    ctypedef png_uint_16     *png_uint_16p
-    ctypedef png_int_16      *png_int_16p
-    ctypedef char            *png_charp
-    ctypedef char            *png_const_charp
-    ctypedef FILE            *png_FILE_p
-
-    ctypedef struct png_struct:
-        pass
-    ctypedef png_struct      *png_structp
-
-    ctypedef struct png_info:
-        pass
-    ctypedef png_info        *png_infop
-
-    ctypedef struct png_color_8:
-        png_byte red
-        png_byte green
-        png_byte blue
-        png_byte gray
-        png_byte alpha
-    ctypedef png_color_8 *png_color_8p
-
-    cdef png_const_charp PNG_LIBPNG_VER_STRING
-
-    # Note that we don't support error or warning functions
-    png_structp png_create_write_struct(
-        png_const_charp user_png_ver, png_voidp error_ptr,
-        void *error_fn, void *warn_fn)
-    
-    png_infop png_create_info_struct(png_structp png_ptr)
-
-    void png_init_io(png_structp png_ptr, png_FILE_p fp)
-
-    void png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
-        png_uint_32 width, png_uint_32 height, int bit_depth,
-        int color_type, int interlace_method, int compression_method,
-        int filter_method)
-
-    cdef int PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE
-    cdef int PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE
-
-    void png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
-        png_uint_32 res_x, png_uint_32 res_y, int unit_type)
-
-    cdef int PNG_RESOLUTION_METER
-
-    void png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
-        png_color_8p sig_bit)
-
-    void png_write_info(png_structp png_ptr, png_infop info_ptr)
-    void png_write_image(png_structp png_ptr, png_bytep *image)
-    void png_write_end(png_structp png_ptr, png_infop info_ptr)
-
-    void png_destroy_write_struct(
-        png_structp *png_ptr_ptr, png_infop *info_ptr_ptr)
-
-def write_png(np.ndarray[np.uint8_t, ndim=3] buffer,
-              char *filename, int dpi=100):
-
-    # This is something of a translation of the matplotlib _png module
-    cdef png_byte *pix_buffer = <png_byte *> buffer.data
-    cdef int width = buffer.shape[1]
-    cdef int height = buffer.shape[0]
-
-    cdef FILE* fileobj = fopen(filename, "wb")
-    cdef png_bytep *row_pointers
-    cdef png_structp png_ptr
-    cdef png_infop info_ptr
-
-    cdef png_color_8 sig_bit
-    cdef png_uint_32 row
-
-    row_pointers = <png_bytep *> alloca(sizeof(png_bytep) * height)
-
-    for row in range(height):
-        row_pointers[row] = pix_buffer + row * width * 4
-    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL)
-    info_ptr = png_create_info_struct(png_ptr)
-    
-    # Um we are ignoring setjmp sorry guys
-
-    png_init_io(png_ptr, fileobj)
-
-    png_set_IHDR(png_ptr, info_ptr, width, height, 8,
-                 PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
-                 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE)
-
-    cdef size_t dots_per_meter = <size_t> (dpi / (2.54 / 100.0))
-    png_set_pHYs(png_ptr, info_ptr, dots_per_meter, dots_per_meter,
-                 PNG_RESOLUTION_METER)
-
-    sig_bit.gray = 0
-    sig_bit.red = sig_bit.green = sig_bit.blue = sig_bit.alpha = 8
-
-    png_set_sBIT(png_ptr, info_ptr, &sig_bit)
-
-    png_write_info(png_ptr, info_ptr)
-    png_write_image(png_ptr, row_pointers)
-    png_write_end(png_ptr, info_ptr)
-
-    fclose(fileobj)
-    png_destroy_write_struct(&png_ptr, &info_ptr)
-
-def add_points_to_image(
-        np.ndarray[np.uint8_t, ndim=3] buffer,
-        np.ndarray[np.float64_t, ndim=1] px,
-        np.ndarray[np.float64_t, ndim=1] py,
-        np.float64_t pv):
-    cdef int i, j, k, pi
-    cdef int np = px.shape[0]
-    cdef int xs = buffer.shape[0]
-    cdef int ys = buffer.shape[1]
-    cdef int v 
-    v = iclip(<int>(pv * 255), 0, 255)
-    for pi in range(np):
-        j = <int> (xs * px[pi])
-        i = <int> (ys * py[pi])
-        for k in range(3):
-            buffer[i, j, k] = 0
-    return
-    for i in range(xs):
-        for j in range(ys):
-            for k in range(3):
-                v = buffer[i, j, k]
-                buffer[i, j, k] = iclip(v, 0, 255)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/amr_utils.c
--- a/yt/amr_utils.c	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,32107 +0,0 @@
-/* Generated by Cython 0.13.beta0 on Mon Aug  2 07:18:26 2010 */
-
-#define PY_SSIZE_T_CLEAN
-#include "Python.h"
-#ifndef Py_PYTHON_H
-    #error Python headers needed to compile C extensions, please install development version of Python.
-#else
-
-#include <stddef.h> /* For offsetof */
-#ifndef offsetof
-#define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
-#endif
-
-#if !defined(WIN32) && !defined(MS_WINDOWS)
-  #ifndef __stdcall
-    #define __stdcall
-  #endif
-  #ifndef __cdecl
-    #define __cdecl
-  #endif
-  #ifndef __fastcall
-    #define __fastcall
-  #endif
-#endif
-
-#ifndef DL_IMPORT
-  #define DL_IMPORT(t) t
-#endif
-#ifndef DL_EXPORT
-  #define DL_EXPORT(t) t
-#endif
-
-#ifndef PY_LONG_LONG
-  #define PY_LONG_LONG LONG_LONG
-#endif
-
-#if PY_VERSION_HEX < 0x02040000
-  #define METH_COEXIST 0
-  #define PyDict_CheckExact(op) (Py_TYPE(op) == &PyDict_Type)
-  #define PyDict_Contains(d,o)   PySequence_Contains(d,o)
-#endif
-
-#if PY_VERSION_HEX < 0x02050000
-  typedef int Py_ssize_t;
-  #define PY_SSIZE_T_MAX INT_MAX
-  #define PY_SSIZE_T_MIN INT_MIN
-  #define PY_FORMAT_SIZE_T ""
-  #define PyInt_FromSsize_t(z) PyInt_FromLong(z)
-  #define PyInt_AsSsize_t(o)   PyInt_AsLong(o)
-  #define PyNumber_Index(o)    PyNumber_Int(o)
-  #define PyIndex_Check(o)     PyNumber_Check(o)
-  #define PyErr_WarnEx(category, message, stacklevel) PyErr_Warn(category, message)
-#endif
-
-#if PY_VERSION_HEX < 0x02060000
-  #define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
-  #define Py_TYPE(ob)   (((PyObject*)(ob))->ob_type)
-  #define Py_SIZE(ob)   (((PyVarObject*)(ob))->ob_size)
-  #define PyVarObject_HEAD_INIT(type, size) \
-          PyObject_HEAD_INIT(type) size,
-  #define PyType_Modified(t)
-
-  typedef struct {
-     void *buf;
-     PyObject *obj;
-     Py_ssize_t len;
-     Py_ssize_t itemsize;
-     int readonly;
-     int ndim;
-     char *format;
-     Py_ssize_t *shape;
-     Py_ssize_t *strides;
-     Py_ssize_t *suboffsets;
-     void *internal;
-  } Py_buffer;
-
-  #define PyBUF_SIMPLE 0
-  #define PyBUF_WRITABLE 0x0001
-  #define PyBUF_FORMAT 0x0004
-  #define PyBUF_ND 0x0008
-  #define PyBUF_STRIDES (0x0010 | PyBUF_ND)
-  #define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
-  #define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
-  #define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
-  #define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
-
-#endif
-
-#if PY_MAJOR_VERSION < 3
-  #define __Pyx_BUILTIN_MODULE_NAME "__builtin__"
-#else
-  #define __Pyx_BUILTIN_MODULE_NAME "builtins"
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define Py_TPFLAGS_CHECKTYPES 0
-  #define Py_TPFLAGS_HAVE_INDEX 0
-#endif
-
-#if (PY_VERSION_HEX < 0x02060000) || (PY_MAJOR_VERSION >= 3)
-  #define Py_TPFLAGS_HAVE_NEWBUFFER 0
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define PyBaseString_Type            PyUnicode_Type
-  #define PyStringObject               PyUnicodeObject
-  #define PyString_Type                PyUnicode_Type
-  #define PyString_Check               PyUnicode_Check
-  #define PyString_CheckExact          PyUnicode_CheckExact
-#endif
-
-#if PY_VERSION_HEX < 0x02060000
-  #define PyBytesObject                PyStringObject
-  #define PyBytes_Type                 PyString_Type
-  #define PyBytes_Check                PyString_Check
-  #define PyBytes_CheckExact           PyString_CheckExact
-  #define PyBytes_FromString           PyString_FromString
-  #define PyBytes_FromStringAndSize    PyString_FromStringAndSize
-  #define PyBytes_FromFormat           PyString_FromFormat
-  #define PyBytes_DecodeEscape         PyString_DecodeEscape
-  #define PyBytes_AsString             PyString_AsString
-  #define PyBytes_AsStringAndSize      PyString_AsStringAndSize
-  #define PyBytes_Size                 PyString_Size
-  #define PyBytes_AS_STRING            PyString_AS_STRING
-  #define PyBytes_GET_SIZE             PyString_GET_SIZE
-  #define PyBytes_Repr                 PyString_Repr
-  #define PyBytes_Concat               PyString_Concat
-  #define PyBytes_ConcatAndDel         PyString_ConcatAndDel
-  #define PySet_Check(obj)             PyObject_TypeCheck(obj, &PySet_Type)
-  #define PyFrozenSet_Check(obj)       PyObject_TypeCheck(obj, &PyFrozenSet_Type)
-#endif
-
-#ifndef PySet_CheckExact
-#  define PySet_CheckExact(obj)          (Py_TYPE(obj) == &PySet_Type)
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define PyInt_Type                   PyLong_Type
-  #define PyInt_Check(op)              PyLong_Check(op)
-  #define PyInt_CheckExact(op)         PyLong_CheckExact(op)
-  #define PyInt_FromString             PyLong_FromString
-  #define PyInt_FromUnicode            PyLong_FromUnicode
-  #define PyInt_FromLong               PyLong_FromLong
-  #define PyInt_FromSize_t             PyLong_FromSize_t
-  #define PyInt_FromSsize_t            PyLong_FromSsize_t
-  #define PyInt_AsLong                 PyLong_AsLong
-  #define PyInt_AS_LONG                PyLong_AS_LONG
-  #define PyInt_AsSsize_t              PyLong_AsSsize_t
-  #define PyInt_AsUnsignedLongMask     PyLong_AsUnsignedLongMask
-  #define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_TrueDivide(x,y)
-  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceTrueDivide(x,y)
-#else
-  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_Divide(x,y)
-  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceDivide(x,y)
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define PyMethod_New(func, self, klass) ((self) ? PyMethod_New(func, self) : PyInstanceMethod_New(func))
-#endif
-
-#if PY_VERSION_HEX < 0x02050000
-  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),((char *)(n)))
-  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),((char *)(n)),(a))
-  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),((char *)(n)))
-#else
-  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),(n))
-  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),(n),(a))
-  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),(n))
-#endif
-
-#if PY_VERSION_HEX < 0x02050000
-  #define __Pyx_NAMESTR(n) ((char *)(n))
-  #define __Pyx_DOCSTR(n)  ((char *)(n))
-#else
-  #define __Pyx_NAMESTR(n) (n)
-  #define __Pyx_DOCSTR(n)  (n)
-#endif
-
-#ifdef __cplusplus
-#define __PYX_EXTERN_C extern "C"
-#else
-#define __PYX_EXTERN_C extern
-#endif
-
-#if defined(WIN32) || defined(MS_WINDOWS)
-#define _USE_MATH_DEFINES
-#endif
-#include <math.h>
-#define __PYX_HAVE_API__yt__amr_utils
-#include "stdio.h"
-#include "stdlib.h"
-#include "numpy/arrayobject.h"
-#include "numpy/ufuncobject.h"
-#include "math.h"
-#include "FixedInterpolator.h"
-#include "png.h"
-
-/* inline attribute */
-#ifndef CYTHON_INLINE
-  #if defined(__GNUC__)
-    #define CYTHON_INLINE __inline__
-  #elif defined(_MSC_VER)
-    #define CYTHON_INLINE __inline
-  #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
-    #define CYTHON_INLINE inline
-  #else
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-typedef struct __Pyx_StructField_ {
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-
-#define __Pyx_GetItemInt_List(o, i, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
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-                                                    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
-
-static CYTHON_INLINE PyObject *__Pyx_GetItemInt_List_Fast(PyObject *o, Py_ssize_t i) {
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-#define __Pyx_GetItemInt_Tuple(o, i, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
-                                                    __Pyx_GetItemInt_Tuple_Fast(o, i) : \
-                                                    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
-
-static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Tuple_Fast(PyObject *o, Py_ssize_t i) {
-    if (likely(o != Py_None)) {
-        if (likely((0 <= i) & (i < PyTuple_GET_SIZE(o)))) {
-            PyObject *r = PyTuple_GET_ITEM(o, i);
-            Py_INCREF(r);
-            return r;
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-        else if ((-PyTuple_GET_SIZE(o) <= i) & (i < 0)) {
-            PyObject *r = PyTuple_GET_ITEM(o, PyTuple_GET_SIZE(o) + i);
-            Py_INCREF(r);
-            return r;
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-    return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
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-
-
-#define __Pyx_GetItemInt(o, i, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
-                                                    __Pyx_GetItemInt_Fast(o, i) : \
-                                                    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
-
-static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Fast(PyObject *o, Py_ssize_t i) {
-    PyObject *r;
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-        r = PyList_GET_ITEM(o, i);
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-static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type); /*proto*/
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-#define __Pyx_BufPtrStrided4d(type, buf, i0, s0, i1, s1, i2, s2, i3, s3) (type)((char*)buf + i0 * s0 + i1 * s1 + i2 * s2 + i3 * s3)
-#define __Pyx_BufPtrStrided2d(type, buf, i0, s0, i1, s1) (type)((char*)buf + i0 * s0 + i1 * s1)
-
-static void __Pyx_RaiseBufferFallbackError(void); /*proto*/
-#define __Pyx_BufPtrStrided3d(type, buf, i0, s0, i1, s1, i2, s2) (type)((char*)buf + i0 * s0 + i1 * s1 + i2 * s2)
-static void __Pyx_RaiseBufferIndexError(int axis); /*proto*/
-
-static CYTHON_INLINE long __Pyx_mod_long(long, long); /* proto */
-
-static CYTHON_INLINE PyObject* __Pyx_PyObject_Append(PyObject* L, PyObject* x) {
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-        if (PyList_Append(L, x) < 0) return NULL;
-        Py_INCREF(Py_None);
-        return Py_None; /* this is just to have an accurate signature */
-    }
-    else {
-        PyObject *r, *m;
-        m = __Pyx_GetAttrString(L, "append");
-        if (!m) return NULL;
-        r = PyObject_CallFunctionObjArgs(m, x, NULL);
-        Py_DECREF(m);
-        return r;
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-}
-
-static CYTHON_INLINE long __Pyx_div_long(long, long); /* proto */
-
-static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index);
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-static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected);
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-static PyObject *__Pyx_UnpackItem(PyObject *, Py_ssize_t index); /*proto*/
-static int __Pyx_EndUnpack(PyObject *, Py_ssize_t expected); /*proto*/
-
-#define __Pyx_SetItemInt(o, i, v, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
-                                                    __Pyx_SetItemInt_Fast(o, i, v) : \
-                                                    __Pyx_SetItemInt_Generic(o, to_py_func(i), v))
-
-static CYTHON_INLINE int __Pyx_SetItemInt_Generic(PyObject *o, PyObject *j, PyObject *v) {
-    int r;
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-    Py_DECREF(j);
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-
-static CYTHON_INLINE int __Pyx_SetItemInt_Fast(PyObject *o, Py_ssize_t i, PyObject *v) {
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-        Py_INCREF(v);
-        Py_DECREF(PyList_GET_ITEM(o, i));
-        PyList_SET_ITEM(o, i, v);
-        return 1;
-    }
-    else if (Py_TYPE(o)->tp_as_sequence && Py_TYPE(o)->tp_as_sequence->sq_ass_item && (likely(i >= 0)))
-        return PySequence_SetItem(o, i, v);
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-        return __Pyx_SetItemInt_Generic(o, j, v);
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-static CYTHON_INLINE __pyx_t_5numpy_int64_t __Pyx_div___pyx_t_5numpy_int64_t(__pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t); /* proto */
-
-#define UNARY_NEG_WOULD_OVERFLOW(x)		(((x) < 0) & ((unsigned long)(x) == 0-(unsigned long)(x)))
-
-static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void);
-
-static void __Pyx_UnpackTupleError(PyObject *, Py_ssize_t index); /*proto*/
-#if PY_MAJOR_VERSION < 3
-static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags);
-static void __Pyx_ReleaseBuffer(Py_buffer *view);
-#else
-#define __Pyx_GetBuffer PyObject_GetBuffer
-#define __Pyx_ReleaseBuffer PyBuffer_Release
-#endif
-
-Py_ssize_t __Pyx_zeros[] = {0, 0, 0, 0};
-Py_ssize_t __Pyx_minusones[] = {-1, -1, -1, -1};
-
-static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list); /*proto*/
-
-static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_intp(npy_intp);
-
-static CYTHON_INLINE npy_int32 __Pyx_PyInt_from_py_npy_int32(PyObject *);
-
-static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int32(npy_int32);
-
-static int __Pyx_Print(PyObject*, PyObject *, int); /*proto*/
-#if PY_MAJOR_VERSION >= 3
-static PyObject* __pyx_print = 0;
-static PyObject* __pyx_print_kwargs = 0;
-#endif
-
-static CYTHON_INLINE npy_int64 __Pyx_PyInt_from_py_npy_int64(PyObject *);
-
-static int __Pyx_PrintOne(PyObject* stream, PyObject *o); /*proto*/
-
-static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
-
-static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int64(npy_int64);
-
-#if PY_VERSION_HEX < 0x02050000
-#ifndef PyAnySet_CheckExact
-
-#define PyAnySet_CheckExact(ob) \
-    ((ob)->ob_type == &PySet_Type || \
-     (ob)->ob_type == &PyFrozenSet_Type)
-
-#define PySet_New(iterable) \
-    PyObject_CallFunctionObjArgs((PyObject *)&PySet_Type, (iterable), NULL)
-
-#define Pyx_PyFrozenSet_New(iterable) \
-    PyObject_CallFunctionObjArgs((PyObject *)&PyFrozenSet_Type, (iterable), NULL)
-
-#define PySet_Size(anyset) \
-    PyObject_Size((anyset))
-
-#define PySet_Contains(anyset, key) \
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-
-#define PySet_Pop(set) \
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-
-static CYTHON_INLINE int PySet_Clear(PyObject *set) {
-    PyObject *ret = PyObject_CallMethod(set, (char *)"clear", NULL);
-    if (!ret) return -1;
-    Py_DECREF(ret); return 0;
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-
-static CYTHON_INLINE int PySet_Discard(PyObject *set, PyObject *key) {
-    PyObject *ret = PyObject_CallMethod(set, (char *)"discard", (char *)"O", key);
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-    Py_DECREF(ret); return 0;
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-
-static CYTHON_INLINE int PySet_Add(PyObject *set, PyObject *key) {
-    PyObject *ret = PyObject_CallMethod(set, (char *)"add", (char *)"O", key);
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-    Py_DECREF(ret); return 0;
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-
-#endif /* PyAnySet_CheckExact (<= Py2.4) */
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-#if PY_VERSION_HEX < 0x02040000
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-
-static PyTypeObject *__Pyx_PySet_Type = NULL;
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-
-#define PySet_Type (*__Pyx_PySet_Type)
-#define PyFrozenSet_Type (*__Pyx_PyFrozenSet_Type)
-
-#define PyAnySet_Check(ob) \
-    (PyAnySet_CheckExact(ob) || \
-     PyType_IsSubtype((ob)->ob_type, &PySet_Type) || \
-     PyType_IsSubtype((ob)->ob_type, &PyFrozenSet_Type))
-
-#define PyFrozenSet_CheckExact(ob) ((ob)->ob_type == &PyFrozenSet_Type)
-
-static int __Pyx_Py23SetsImport(void) {
-    PyObject *sets=0, *Set=0, *ImmutableSet=0;
-
-    sets = PyImport_ImportModule((char *)"sets");
-    if (!sets) goto bad;
-    Set = PyObject_GetAttrString(sets, (char *)"Set");
-    if (!Set) goto bad;
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-    Py_DECREF(sets);
-
-    __Pyx_PySet_Type       = (PyTypeObject*) Set;
-    __Pyx_PyFrozenSet_Type = (PyTypeObject*) ImmutableSet;
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-    return 0;
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- bad:
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-    Py_XDECREF(Set);
-    Py_XDECREF(ImmutableSet);
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-static CYTHON_INLINE png_uint_32 __Pyx_PyInt_from_py_png_uint_32(PyObject *);
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-static CYTHON_INLINE long __Pyx_pow_long(long, long); /* proto */
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-#if CYTHON_CCOMPLEX
-  #ifdef __cplusplus
-    #define __Pyx_CREAL(z) ((z).real())
-    #define __Pyx_CIMAG(z) ((z).imag())
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-    #define __Pyx_CREAL(z) (__real__(z))
-    #define __Pyx_CIMAG(z) (__imag__(z))
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-#else
-    #define __Pyx_CREAL(z) ((z).real)
-    #define __Pyx_CIMAG(z) ((z).imag)
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-#if defined(_WIN32) && defined(__cplusplus) && CYTHON_CCOMPLEX
-    #define __Pyx_SET_CREAL(z,x) ((z).real(x))
-    #define __Pyx_SET_CIMAG(z,y) ((z).imag(y))
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-    #define __Pyx_SET_CREAL(z,x) __Pyx_CREAL(z) = (x)
-    #define __Pyx_SET_CIMAG(z,y) __Pyx_CIMAG(z) = (y)
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-static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float, float);
-
-#if CYTHON_CCOMPLEX
-    #define __Pyx_c_eqf(a, b)   ((a)==(b))
-    #define __Pyx_c_sumf(a, b)  ((a)+(b))
-    #define __Pyx_c_difff(a, b) ((a)-(b))
-    #define __Pyx_c_prodf(a, b) ((a)*(b))
-    #define __Pyx_c_quotf(a, b) ((a)/(b))
-    #define __Pyx_c_negf(a)     (-(a))
-  #ifdef __cplusplus
-    #define __Pyx_c_is_zerof(z) ((z)==(float)0)
-    #define __Pyx_c_conjf(z)    (::std::conj(z))
-    /*#define __Pyx_c_absf(z)     (::std::abs(z))*/
-  #else
-    #define __Pyx_c_is_zerof(z) ((z)==0)
-    #define __Pyx_c_conjf(z)    (conjf(z))
-    /*#define __Pyx_c_absf(z)     (cabsf(z))*/
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-#else
-    static CYTHON_INLINE int __Pyx_c_eqf(__pyx_t_float_complex, __pyx_t_float_complex);
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_sumf(__pyx_t_float_complex, __pyx_t_float_complex);
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_difff(__pyx_t_float_complex, __pyx_t_float_complex);
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_prodf(__pyx_t_float_complex, __pyx_t_float_complex);
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_quotf(__pyx_t_float_complex, __pyx_t_float_complex);
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_negf(__pyx_t_float_complex);
-    static CYTHON_INLINE int __Pyx_c_is_zerof(__pyx_t_float_complex);
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_conjf(__pyx_t_float_complex);
-    /*static CYTHON_INLINE float __Pyx_c_absf(__pyx_t_float_complex);*/
-#endif
-
-static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double, double);
-
-#if CYTHON_CCOMPLEX
-    #define __Pyx_c_eq(a, b)   ((a)==(b))
-    #define __Pyx_c_sum(a, b)  ((a)+(b))
-    #define __Pyx_c_diff(a, b) ((a)-(b))
-    #define __Pyx_c_prod(a, b) ((a)*(b))
-    #define __Pyx_c_quot(a, b) ((a)/(b))
-    #define __Pyx_c_neg(a)     (-(a))
-  #ifdef __cplusplus
-    #define __Pyx_c_is_zero(z) ((z)==(double)0)
-    #define __Pyx_c_conj(z)    (::std::conj(z))
-    /*#define __Pyx_c_abs(z)     (::std::abs(z))*/
-  #else
-    #define __Pyx_c_is_zero(z) ((z)==0)
-    #define __Pyx_c_conj(z)    (conj(z))
-    /*#define __Pyx_c_abs(z)     (cabs(z))*/
- #endif
-#else
-    static CYTHON_INLINE int __Pyx_c_eq(__pyx_t_double_complex, __pyx_t_double_complex);
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_sum(__pyx_t_double_complex, __pyx_t_double_complex);
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_diff(__pyx_t_double_complex, __pyx_t_double_complex);
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_prod(__pyx_t_double_complex, __pyx_t_double_complex);
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_quot(__pyx_t_double_complex, __pyx_t_double_complex);
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_neg(__pyx_t_double_complex);
-    static CYTHON_INLINE int __Pyx_c_is_zero(__pyx_t_double_complex);
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_conj(__pyx_t_double_complex);
-    /*static CYTHON_INLINE double __Pyx_c_abs(__pyx_t_double_complex);*/
-#endif
-
-static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject *);
-
-static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject *);
-
-static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject *);
-
-static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject *);
-
-static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject *);
-
-static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject *);
-
-static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject *);
-
-static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject *);
-
-static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject *);
-
-static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject *);
-
-static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject *);
-
-static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject *);
-
-static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject *);
-
-static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject *);
-
-static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject *);
-
-static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject *);
-
-static void __Pyx_WriteUnraisable(const char *name); /*proto*/
-
-static int __Pyx_SetVtable(PyObject *dict, void *vtable); /*proto*/
-
-static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name, long size, int strict);  /*proto*/
-
-static PyObject *__Pyx_ImportModule(const char *name); /*proto*/
-
-static void __Pyx_AddTraceback(const char *funcname); /*proto*/
-
-static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
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-
-/* Module declarations from cpython.ref */
-
-/* Module declarations from libc.stdio */
-
-/* Module declarations from cpython.object */
-
-/* Module declarations from libc.stdlib */
-
-/* Module declarations from numpy */
-
-/* Module declarations from numpy */
-
-static PyTypeObject *__pyx_ptype_5numpy_dtype = 0;
-static PyTypeObject *__pyx_ptype_5numpy_flatiter = 0;
-static PyTypeObject *__pyx_ptype_5numpy_broadcast = 0;
-static PyTypeObject *__pyx_ptype_5numpy_ndarray = 0;
-static PyTypeObject *__pyx_ptype_5numpy_ufunc = 0;
-static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew1(PyObject *); /*proto*/
-static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew2(PyObject *, PyObject *); /*proto*/
-static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew3(PyObject *, PyObject *, PyObject *); /*proto*/
-static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew4(PyObject *, PyObject *, PyObject *, PyObject *); /*proto*/
-static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew5(PyObject *, PyObject *, PyObject *, PyObject *, PyObject *); /*proto*/
-static CYTHON_INLINE char *__pyx_f_5numpy__util_dtypestring(PyArray_Descr *, char *, char *, int *); /*proto*/
-static CYTHON_INLINE void __pyx_f_5numpy_set_array_base(PyArrayObject *, PyObject *); /*proto*/
-static CYTHON_INLINE PyObject *__pyx_f_5numpy_get_array_base(PyArrayObject *); /*proto*/
-/* Module declarations from cython */
-
-/* Module declarations from stdlib */
-
-/* Module declarations from stdio */
-
-/* Module declarations from yt.amr_utils */
-
-static PyTypeObject *__pyx_ptype_2yt_9amr_utils_position = 0;
-static PyTypeObject *__pyx_ptype_2yt_9amr_utils_OctreeGrid = 0;
-static PyTypeObject *__pyx_ptype_2yt_9amr_utils_OctreeGridList = 0;
-static PyTypeObject *__pyx_ptype_2yt_9amr_utils_VectorPlane = 0;
-static PyTypeObject *__pyx_ptype_2yt_9amr_utils_TransferFunctionProxy = 0;
-static PyTypeObject *__pyx_ptype_2yt_9amr_utils_PartitionedGrid = 0;
-static PyTypeObject *__pyx_ptype_2yt_9amr_utils_GridFace = 0;
-static PyTypeObject *__pyx_ptype_2yt_9amr_utils_ProtoPrism = 0;
-static PyTypeObject *__pyx_ptype_2yt_9amr_utils_QuadTree = 0;
-static CYTHON_INLINE void __pyx_f_2yt_9amr_utils_set_rotated_pos(__pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t (*)[3], __pyx_t_5numpy_float64_t *, int, int, int); /*proto*/
-static void __pyx_f_2yt_9amr_utils_normalize_vector(__pyx_t_5numpy_float64_t *); /*proto*/
-static void __pyx_f_2yt_9amr_utils_get_cross_product(__pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *); /*proto*/
-static int __pyx_f_2yt_9amr_utils_check_projected_overlap(__pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, int, __pyx_t_5numpy_float64_t (*)[3], __pyx_t_5numpy_float64_t (*)[3]); /*proto*/
-static CYTHON_INLINE int __pyx_f_2yt_9amr_utils_imax(int, int); /*proto*/
-static CYTHON_INLINE __pyx_t_5numpy_float64_t __pyx_f_2yt_9amr_utils_fmax(__pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t); /*proto*/
-static CYTHON_INLINE int __pyx_f_2yt_9amr_utils_imin(int, int); /*proto*/
-static CYTHON_INLINE __pyx_t_5numpy_float64_t __pyx_f_2yt_9amr_utils_fmin(__pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t); /*proto*/
-static CYTHON_INLINE int __pyx_f_2yt_9amr_utils_iclip(int, int, int); /*proto*/
-static CYTHON_INLINE __pyx_t_5numpy_float64_t __pyx_f_2yt_9amr_utils_fclip(__pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t); /*proto*/
-static void __pyx_f_2yt_9amr_utils_FIT_initialize_table(struct __pyx_t_2yt_9amr_utils_FieldInterpolationTable *, int, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, int, struct __pyx_opt_args_2yt_9amr_utils_FIT_initialize_table *__pyx_optional_args); /*proto*/
-static __pyx_t_5numpy_float64_t __pyx_f_2yt_9amr_utils_FIT_get_value(struct __pyx_t_2yt_9amr_utils_FieldInterpolationTable *, __pyx_t_5numpy_float64_t *); /*proto*/
-static CYTHON_INLINE __pyx_t_5numpy_int64_t __pyx_f_2yt_9amr_utils_i64max(__pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t); /*proto*/
-static CYTHON_INLINE __pyx_t_5numpy_int64_t __pyx_f_2yt_9amr_utils_i64min(__pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t); /*proto*/
-static CYTHON_INLINE int __pyx_f_2yt_9amr_utils_are_neighbors(__pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t); /*proto*/
-static void __pyx_f_2yt_9amr_utils_QTN_add_value(struct __pyx_t_2yt_9amr_utils_QuadTreeNode *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t); /*proto*/
-static void __pyx_f_2yt_9amr_utils_QTN_refine(struct __pyx_t_2yt_9amr_utils_QuadTreeNode *); /*proto*/
-static struct __pyx_t_2yt_9amr_utils_QuadTreeNode *__pyx_f_2yt_9amr_utils_QTN_initialize(__pyx_t_5numpy_int64_t *, int, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t, int); /*proto*/
-static void __pyx_f_2yt_9amr_utils_QTN_free(struct __pyx_t_2yt_9amr_utils_QuadTreeNode *); /*proto*/
-static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int32_t = { "int32_t", NULL, sizeof(__pyx_t_5numpy_int32_t), 'I' };
-static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t = { "float64_t", NULL, sizeof(__pyx_t_5numpy_float64_t), 'R' };
-static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int_t = { "int_t", NULL, sizeof(__pyx_t_5numpy_int_t), 'I' };
-static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int8_t = { "int8_t", NULL, sizeof(__pyx_t_5numpy_int8_t), 'I' };
-static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_float_t = { "float_t", NULL, sizeof(__pyx_t_5numpy_float_t), 'R' };
-static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int64_t = { "int64_t", NULL, sizeof(__pyx_t_5numpy_int64_t), 'I' };
-static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_float32_t = { "float32_t", NULL, sizeof(__pyx_t_5numpy_float32_t), 'R' };
-static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_uint8_t = { "uint8_t", NULL, sizeof(__pyx_t_5numpy_uint8_t), 'U' };
-#define __Pyx_MODULE_NAME "yt.amr_utils"
-int __pyx_module_is_main_yt__amr_utils = 0;
-
-/* Implementation of yt.amr_utils */
-static PyObject *__pyx_builtin_range;
-static PyObject *__pyx_builtin_xrange;
-static PyObject *__pyx_builtin_RuntimeError;
-static PyObject *__pyx_builtin_ValueError;
-static char __pyx_k_1[] = "RecurseOctreeDepthFirst";
-static char __pyx_k_2[] = "RecurseOctreeByLevels";
-static char __pyx_k_3[] = "Field table";
-static char __pyx_k_4[] = "corresponds to";
-static char __pyx_k_5[] = "(Weighted with ";
-static char __pyx_k_6[] = ")";
-static char __pyx_k_7[] = "ndarray is not C contiguous";
-static char __pyx_k_8[] = "ndarray is not Fortran contiguous";
-static char __pyx_k_9[] = "Non-native byte order not supported";
-static char __pyx_k_10[] = "unknown dtype code in numpy.pxd (%d)";
-static char __pyx_k_11[] = "Format string allocated too short, see comment in numpy.pxd";
-static char __pyx_k_12[] = "Format string allocated too short.";
-static char __pyx_k_13[] = "\nContainer file to hold all our Cython routines.  This is to avoid problems with\nstatic linking.\n\nAuthor: Matthew Turk <matthewturk@gmail.com>\nAffiliation: KIPAC/SLAC/Stanford\nHomepage: http://yt.enzotools.org/\nLicense:\n  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.\n\n  This file is part of yt.\n\n  yt is free software; you can redistribute it and/or modify\n  it under the terms of the GNU General Public License as published by\n  the Free Software Foundation; either version 3 of the License, or\n  (at your option) any later version.\n\n  This program is distributed in the hope that it will be useful,\n  but WITHOUT ANY WARRANTY; without even the implied warranty of\n  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n  GNU General Public License for more details.\n\n  You should have received a copy of the GNU General Public License\n  along with this program.  If not, see <http://www.gnu.org/licenses/>.\n";
-static char __pyx_k_14[] = "Transfer3D (line 36)";
-static char __pyx_k_15[] = "TransferShells (line 74)";
-static char __pyx_k__B[] = "B";
-static char __pyx_k__F[] = "F";
-static char __pyx_k__H[] = "H";
-static char __pyx_k__I[] = "I";
-static char __pyx_k__L[] = "L";
-static char __pyx_k__O[] = "O";
-static char __pyx_k__Q[] = "Q";
-static char __pyx_k__a[] = "a";
-static char __pyx_k__b[] = "b";
-static char __pyx_k__d[] = "d";
-static char __pyx_k__e[] = "e";
-static char __pyx_k__f[] = "f";
-static char __pyx_k__g[] = "g";
-static char __pyx_k__h[] = "h";
-static char __pyx_k__i[] = "i";
-static char __pyx_k__l[] = "l";
-static char __pyx_k__q[] = "q";
-static char __pyx_k__u[] = "u";
-static char __pyx_k__v[] = "v";
-static char __pyx_k__x[] = "x";
-static char __pyx_k__y[] = "y";
-static char __pyx_k__z[] = "z";
-static char __pyx_k__Zd[] = "Zd";
-static char __pyx_k__Zf[] = "Zf";
-static char __pyx_k__Zg[] = "Zg";
-static char __pyx_k__cm[] = "cm";
-static char __pyx_k__dx[] = "dx";
-static char __pyx_k__dy[] = "dy";
-static char __pyx_k__dz[] = "dz";
-static char __pyx_k__fn[] = "fn";
-static char __pyx_k__gi[] = "gi";
-static char __pyx_k__np[] = "np";
-static char __pyx_k__ns[] = "ns";
-static char __pyx_k__nv[] = "nv";
-static char __pyx_k__pv[] = "pv";
-static char __pyx_k__px[] = "px";
-static char __pyx_k__py[] = "py";
-static char __pyx_k__rb[] = "rb";
-static char __pyx_k__tf[] = "tf";
-static char __pyx_k__ug[] = "ug";
-static char __pyx_k__vp[] = "vp";
-static char __pyx_k__wb[] = "wb";
-static char __pyx_k__buf[] = "buf";
-static char __pyx_k__dds[] = "dds";
-static char __pyx_k__dpi[] = "dpi";
-static char __pyx_k__dvs[] = "dvs";
-static char __pyx_k__i_f[] = "i_f";
-static char __pyx_k__i_i[] = "i_i";
-static char __pyx_k__i_s[] = "i_s";
-static char __pyx_k__ind[] = "ind";
-static char __pyx_k__j_f[] = "j_f";
-static char __pyx_k__j_i[] = "j_i";
-static char __pyx_k__k_f[] = "k_f";
-static char __pyx_k__k_i[] = "k_i";
-static char __pyx_k__o_s[] = "o_s";
-static char __pyx_k__obj[] = "obj";
-static char __pyx_k__pdx[] = "pdx";
-static char __pyx_k__pdy[] = "pdy";
-static char __pyx_k__po2[] = "po2";
-static char __pyx_k__pos[] = "pos";
-static char __pyx_k__pxs[] = "pxs";
-static char __pyx_k__pys[] = "pys";
-static char __pyx_k__red[] = "red";
-static char __pyx_k__val[] = "val";
-static char __pyx_k__base[] = "base";
-static char __pyx_k__blue[] = "blue";
-static char __pyx_k__copy[] = "copy";
-static char __pyx_k__data[] = "data";
-static char __pyx_k__dbin[] = "dbin";
-static char __pyx_k__dims[] = "dims";
-static char __pyx_k__gray[] = "gray";
-static char __pyx_k__grid[] = "grid";
-static char __pyx_k__idds[] = "idds";
-static char __pyx_k__imax[] = "imax";
-static char __pyx_k__imin[] = "imin";
-static char __pyx_k__int8[] = "int8";
-static char __pyx_k__jmax[] = "jmax";
-static char __pyx_k__jmin[] = "jmin";
-static char __pyx_k__kmax[] = "kmax";
-static char __pyx_k__kmin[] = "kmin";
-static char __pyx_k__left[] = "left";
-static char __pyx_k__mask[] = "mask";
-static char __pyx_k__mass[] = "mass";
-static char __pyx_k__ndim[] = "ndim";
-static char __pyx_k__posx[] = "posx";
-static char __pyx_k__posy[] = "posy";
-static char __pyx_k__posz[] = "posz";
-static char __pyx_k__x_is[] = "x_is";
-static char __pyx_k__y_is[] = "y_is";
-static char __pyx_k__z_is[] = "z_is";
-static char __pyx_k__alpha[] = "alpha";
-static char __pyx_k__coord[] = "coord";
-static char __pyx_k__descr[] = "descr";
-static char __pyx_k__dtype[] = "dtype";
-static char __pyx_k__empty[] = "empty";
-static char __pyx_k__field[] = "field";
-static char __pyx_k__floor[] = "floor";
-static char __pyx_k__green[] = "green";
-static char __pyx_k__grids[] = "grids";
-static char __pyx_k__idbin[] = "idbin";
-static char __pyx_k__image[] = "image";
-static char __pyx_k__int32[] = "int32";
-static char __pyx_k__int64[] = "int64";
-static char __pyx_k__joins[] = "joins";
-static char __pyx_k__level[] = "level";
-static char __pyx_k__names[] = "names";
-static char __pyx_k__nbins[] = "nbins";
-static char __pyx_k__numpy[] = "numpy";
-static char __pyx_k__nvals[] = "nvals";
-static char __pyx_k__order[] = "order";
-static char __pyx_k__pmask[] = "pmask";
-static char __pyx_k__pvals[] = "pvals";
-static char __pyx_k__range[] = "range";
-static char __pyx_k__shape[] = "shape";
-static char __pyx_k__split[] = "split";
-static char __pyx_k__stack[] = "stack";
-static char __pyx_k__sweep[] = "sweep";
-static char __pyx_k__table[] = "table";
-static char __pyx_k__wvals[] = "wvals";
-static char __pyx_k__x_vec[] = "x_vec";
-static char __pyx_k__y_vec[] = "y_vec";
-static char __pyx_k__zeros[] = "zeros";
-static char __pyx_k__aimage[] = "aimage";
-static char __pyx_k__ax_vec[] = "ax_vec";
-static char __pyx_k__ay_vec[] = "ay_vec";
-static char __pyx_k__bounds[] = "bounds";
-static char __pyx_k__buffer[] = "buffer";
-static char __pyx_k__center[] = "center";
-static char __pyx_k__curpos[] = "curpos";
-static char __pyx_k__fields[] = "fields";
-static char __pyx_k__format[] = "format";
-static char __pyx_k__grid_t[] = "grid_t";
-static char __pyx_k__offset[] = "offset";
-static char __pyx_k__output[] = "output";
-static char __pyx_k__points[] = "points";
-static char __pyx_k__shells[] = "shells";
-static char __pyx_k__tables[] = "tables";
-static char __pyx_k__tf_obj[] = "tf_obj";
-static char __pyx_k__values[] = "values";
-static char __pyx_k__vp_dir[] = "vp_dir";
-static char __pyx_k__vp_pos[] = "vp_pos";
-static char __pyx_k__x_bins[] = "x_bins";
-static char __pyx_k__x_vals[] = "x_vals";
-static char __pyx_k__xrange[] = "xrange";
-static char __pyx_k__y_bins[] = "y_bins";
-static char __pyx_k__y_vals[] = "y_vals";
-static char __pyx_k__z_bins[] = "z_bins";
-static char __pyx_k__z_vals[] = "z_vals";
-static char __pyx_k__Channel[] = "Channel";
-static char __pyx_k__acenter[] = "acenter";
-static char __pyx_k__avp_dir[] = "avp_dir";
-static char __pyx_k__avp_pos[] = "avp_pos";
-static char __pyx_k__corners[] = "corners";
-static char __pyx_k__float32[] = "float32";
-static char __pyx_k__float64[] = "float64";
-static char __pyx_k__grid_dt[] = "grid_dt";
-static char __pyx_k__istride[] = "istride";
-static char __pyx_k__jstride[] = "jstride";
-static char __pyx_k__max_ind[] = "max_ind";
-static char __pyx_k__my_data[] = "my_data";
-static char __pyx_k__nshells[] = "nshells";
-static char __pyx_k__refined[] = "refined";
-static char __pyx_k__rot_mat[] = "rot_mat";
-static char __pyx_k__strides[] = "strides";
-static char __pyx_k__LeftEdge[] = "LeftEdge";
-static char __pyx_k____main__[] = "__main__";
-static char __pyx_k____test__[] = "__test__";
-static char __pyx_k__cellSize[] = "cellSize";
-static char __pyx_k__children[] = "children";
-static char __pyx_k__field_id[] = "field_id";
-static char __pyx_k__filename[] = "filename";
-static char __pyx_k__grid_dds[] = "grid_dds";
-static char __pyx_k__istorage[] = "istorage";
-static char __pyx_k__itemsize[] = "itemsize";
-static char __pyx_k__leftEdge[] = "leftEdge";
-static char __pyx_k__n_fields[] = "n_fields";
-static char __pyx_k__readonly[] = "readonly";
-static char __pyx_k__type_num[] = "type_num";
-static char __pyx_k__x_bounds[] = "x_bounds";
-static char __pyx_k__RightEdge[] = "RightEdge";
-static char __pyx_k__byteorder[] = "byteorder";
-static char __pyx_k__copy_back[] = "copy_back";
-static char __pyx_k__copy_into[] = "copy_into";
-static char __pyx_k__direction[] = "direction";
-static char __pyx_k__field_ids[] = "field_ids";
-static char __pyx_k__genealogy[] = "genealogy";
-static char __pyx_k__grid_mask[] = "grid_mask";
-static char __pyx_k__left_edge[] = "left_edge";
-static char __pyx_k__root_size[] = "root_size";
-static char __pyx_k__slab_size[] = "slab_size";
-static char __pyx_k__Transfer3D[] = "Transfer3D";
-static char __pyx_k__ValueError[] = "ValueError";
-static char __pyx_k__box_center[] = "box_center";
-static char __pyx_k__box_origin[] = "box_origin";
-static char __pyx_k__child_mask[] = "child_mask";
-static char __pyx_k__count_only[] = "count_only";
-static char __pyx_k__dimensions[] = "dimensions";
-static char __pyx_k__im_strides[] = "im_strides";
-static char __pyx_k__left_edges[] = "left_edges";
-static char __pyx_k__npositions[] = "npositions";
-static char __pyx_k__output_pos[] = "output_pos";
-static char __pyx_k__right_edge[] = "right_edge";
-static char __pyx_k__root_nodes[] = "root_nodes";
-static char __pyx_k__slab_start[] = "slab_start";
-static char __pyx_k__suboffsets[] = "suboffsets";
-static char __pyx_k__vd_strides[] = "vd_strides";
-static char __pyx_k__vp_strides[] = "vp_strides";
-static char __pyx_k__weight_val[] = "weight_val";
-static char __pyx_k__box_lengths[] = "box_lengths";
-static char __pyx_k__box_vectors[] = "box_vectors";
-static char __pyx_k__break_first[] = "break_first";
-static char __pyx_k__refined_pos[] = "refined_pos";
-static char __pyx_k__start_index[] = "start_index";
-static char __pyx_k__RuntimeError[] = "RuntimeError";
-static char __pyx_k__field_tables[] = "field_tables";
-static char __pyx_k__pass_through[] = "pass_through";
-static char __pyx_k__proj_overlap[] = "proj_overlap";
-static char __pyx_k__pweight_vals[] = "pweight_vals";
-static char __pyx_k__child_indices[] = "child_indices";
-static char __pyx_k__eval_transfer[] = "eval_transfer";
-static char __pyx_k__gridDimension[] = "gridDimension";
-static char __pyx_k__integrate_ray[] = "integrate_ray";
-static char __pyx_k__sample_values[] = "sample_values";
-static char __pyx_k__subgrid_faces[] = "subgrid_faces";
-static char __pyx_k__top_grid_dims[] = "top_grid_dims";
-static char __pyx_k__TransferShells[] = "TransferShells";
-static char __pyx_k__count_at_level[] = "count_at_level";
-static char __pyx_k__get_start_stop[] = "get_start_stop";
-static char __pyx_k__grid_left_edge[] = "grid_left_edge";
-static char __pyx_k__n_field_tables[] = "n_field_tables";
-static char __pyx_k__parent_grid_id[] = "parent_grid_id";
-static char __pyx_k__add_to_position[] = "add_to_position";
-static char __pyx_k__field_table_ids[] = "field_table_ids";
-static char __pyx_k__fill_from_level[] = "fill_from_level";
-static char __pyx_k__grid_left_edges[] = "grid_left_edges";
-static char __pyx_k__grid_right_edge[] = "grid_right_edge";
-static char __pyx_k__my_field_tables[] = "my_field_tables";
-static char __pyx_k__weight_field_id[] = "weight_field_id";
-static char __pyx_k__weight_table_id[] = "weight_table_id";
-static char __pyx_k__calculate_extent[] = "calculate_extent";
-static char __pyx_k__grid_right_edges[] = "grid_right_edges";
-static char __pyx_k__weight_field_ids[] = "weight_field_ids";
-static char __pyx_k__weight_table_ids[] = "weight_table_ids";
-static char __pyx_k__find_on_root_level[] = "find_on_root_level";
-static PyObject *__pyx_n_s_1;
-static PyObject *__pyx_kp_u_10;
-static PyObject *__pyx_kp_u_11;
-static PyObject *__pyx_kp_u_12;
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- *         x = x_vals[i]             # <<<<<<<<<<<<<<
- *         y = y_vals[i]
- *         z = z_vals[i]
- */
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-    if (__pyx_t_6 < 0) __pyx_t_6 += __pyx_bshape_0_x_vals;
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-
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- *         z_i = z_is[i]
- *         x = x_vals[i]
- *         y = y_vals[i]             # <<<<<<<<<<<<<<
- *         z = z_vals[i]
- *         dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
- */
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-    if (__pyx_t_7 < 0) __pyx_t_7 += __pyx_bshape_0_y_vals;
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-
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- *         x = x_vals[i]
- *         y = y_vals[i]
- *         z = z_vals[i]             # <<<<<<<<<<<<<<
- *         dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
- *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
- */
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-    __pyx_v_z = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_z_vals.buf, __pyx_t_8, __pyx_bstride_0_z_vals));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":100
- *         y = y_vals[i]
- *         z = z_vals[i]
- *         dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])             # <<<<<<<<<<<<<<
- *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
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- */
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-      PyErr_Format(PyExc_ZeroDivisionError, "float division");
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- *         dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
- *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])             # <<<<<<<<<<<<<<
- *         dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])
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- */
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-    if (__pyx_t_13 < 0) __pyx_t_13 += __pyx_bshape_0_y_bins;
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-      {__pyx_filename = __pyx_f[3]; __pyx_lineno = 101; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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- *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
- *         dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])             # <<<<<<<<<<<<<<
- *         xp = (x - x_bins[x_i]) * dx_inv
- *         yp = (y - y_bins[y_i]) * dy_inv
- */
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-      PyErr_Format(PyExc_ZeroDivisionError, "float division");
-      {__pyx_filename = __pyx_f[3]; __pyx_lineno = 102; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":103
- *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
- *         dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])
- *         xp = (x - x_bins[x_i]) * dx_inv             # <<<<<<<<<<<<<<
- *         yp = (y - y_bins[y_i]) * dy_inv
- *         zp = (z - z_bins[z_i]) * dz_inv
- */
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-    if (__pyx_t_16 < 0) __pyx_t_16 += __pyx_bshape_0_x_bins;
-    __pyx_v_xp = ((__pyx_v_x - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_x_bins.buf, __pyx_t_16, __pyx_bstride_0_x_bins))) * __pyx_v_dx_inv);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":104
- *         dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])
- *         xp = (x - x_bins[x_i]) * dx_inv
- *         yp = (y - y_bins[y_i]) * dy_inv             # <<<<<<<<<<<<<<
- *         zp = (z - z_bins[z_i]) * dz_inv
- *         xm = (x_bins[x_i+1] - x) * dx_inv
- */
-    __pyx_t_17 = __pyx_v_y_i;
-    if (__pyx_t_17 < 0) __pyx_t_17 += __pyx_bshape_0_y_bins;
-    __pyx_v_yp = ((__pyx_v_y - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_y_bins.buf, __pyx_t_17, __pyx_bstride_0_y_bins))) * __pyx_v_dy_inv);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":105
- *         xp = (x - x_bins[x_i]) * dx_inv
- *         yp = (y - y_bins[y_i]) * dy_inv
- *         zp = (z - z_bins[z_i]) * dz_inv             # <<<<<<<<<<<<<<
- *         xm = (x_bins[x_i+1] - x) * dx_inv
- *         ym = (y_bins[y_i+1] - y) * dy_inv
- */
-    __pyx_t_18 = __pyx_v_z_i;
-    if (__pyx_t_18 < 0) __pyx_t_18 += __pyx_bshape_0_z_bins;
-    __pyx_v_zp = ((__pyx_v_z - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_z_bins.buf, __pyx_t_18, __pyx_bstride_0_z_bins))) * __pyx_v_dz_inv);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":106
- *         yp = (y - y_bins[y_i]) * dy_inv
- *         zp = (z - z_bins[z_i]) * dz_inv
- *         xm = (x_bins[x_i+1] - x) * dx_inv             # <<<<<<<<<<<<<<
- *         ym = (y_bins[y_i+1] - y) * dy_inv
- *         zm = (z_bins[z_i+1] - z) * dz_inv
- */
-    __pyx_t_19 = (__pyx_v_x_i + 1);
-    if (__pyx_t_19 < 0) __pyx_t_19 += __pyx_bshape_0_x_bins;
-    __pyx_v_xm = (((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_x_bins.buf, __pyx_t_19, __pyx_bstride_0_x_bins)) - __pyx_v_x) * __pyx_v_dx_inv);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":107
- *         zp = (z - z_bins[z_i]) * dz_inv
- *         xm = (x_bins[x_i+1] - x) * dx_inv
- *         ym = (y_bins[y_i+1] - y) * dy_inv             # <<<<<<<<<<<<<<
- *         zm = (z_bins[z_i+1] - z) * dz_inv
- *         output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \
- */
-    __pyx_t_20 = (__pyx_v_y_i + 1);
-    if (__pyx_t_20 < 0) __pyx_t_20 += __pyx_bshape_0_y_bins;
-    __pyx_v_ym = (((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_y_bins.buf, __pyx_t_20, __pyx_bstride_0_y_bins)) - __pyx_v_y) * __pyx_v_dy_inv);
-
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- *         xm = (x_bins[x_i+1] - x) * dx_inv
- *         ym = (y_bins[y_i+1] - y) * dy_inv
- *         zm = (z_bins[z_i+1] - z) * dz_inv             # <<<<<<<<<<<<<<
- *         output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \
- *                    + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \
- */
-    __pyx_t_21 = (__pyx_v_z_i + 1);
-    if (__pyx_t_21 < 0) __pyx_t_21 += __pyx_bshape_0_z_bins;
-    __pyx_v_zm = (((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_z_bins.buf, __pyx_t_21, __pyx_bstride_0_z_bins)) - __pyx_v_z) * __pyx_v_dz_inv);
-
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- *         ym = (y_bins[y_i+1] - y) * dy_inv
- *         zm = (z_bins[z_i+1] - z) * dz_inv
- *         output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \             # <<<<<<<<<<<<<<
- *                    + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \
- *                    + table[x_i  ,y_i+1,z_i  ] * (xm*yp*zm) \
- */
-    __pyx_t_22 = __pyx_v_x_i;
-    __pyx_t_23 = __pyx_v_y_i;
-    __pyx_t_24 = __pyx_v_z_i;
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-    if (__pyx_t_23 < 0) __pyx_t_23 += __pyx_bshape_1_table;
-    if (__pyx_t_24 < 0) __pyx_t_24 += __pyx_bshape_2_table;
-
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- *         zm = (z_bins[z_i+1] - z) * dz_inv
- *         output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \
- *                    + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \             # <<<<<<<<<<<<<<
- *                    + table[x_i  ,y_i+1,z_i  ] * (xm*yp*zm) \
- *                    + table[x_i  ,y_i  ,z_i+1] * (xm*ym*zp) \
- */
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-    __pyx_t_26 = __pyx_v_y_i;
-    __pyx_t_27 = __pyx_v_z_i;
-    if (__pyx_t_25 < 0) __pyx_t_25 += __pyx_bshape_0_table;
-    if (__pyx_t_26 < 0) __pyx_t_26 += __pyx_bshape_1_table;
-    if (__pyx_t_27 < 0) __pyx_t_27 += __pyx_bshape_2_table;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":111
- *         output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \
- *                    + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \
- *                    + table[x_i  ,y_i+1,z_i  ] * (xm*yp*zm) \             # <<<<<<<<<<<<<<
- *                    + table[x_i  ,y_i  ,z_i+1] * (xm*ym*zp) \
- *                    + table[x_i+1,y_i  ,z_i+1] * (xp*ym*zp) \
- */
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-    __pyx_t_29 = (__pyx_v_y_i + 1);
-    __pyx_t_30 = __pyx_v_z_i;
-    if (__pyx_t_28 < 0) __pyx_t_28 += __pyx_bshape_0_table;
-    if (__pyx_t_29 < 0) __pyx_t_29 += __pyx_bshape_1_table;
-    if (__pyx_t_30 < 0) __pyx_t_30 += __pyx_bshape_2_table;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":112
- *                    + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \
- *                    + table[x_i  ,y_i+1,z_i  ] * (xm*yp*zm) \
- *                    + table[x_i  ,y_i  ,z_i+1] * (xm*ym*zp) \             # <<<<<<<<<<<<<<
- *                    + table[x_i+1,y_i  ,z_i+1] * (xp*ym*zp) \
- *                    + table[x_i  ,y_i+1,z_i+1] * (xm*yp*zp) \
- */
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-    __pyx_t_32 = __pyx_v_y_i;
-    __pyx_t_33 = (__pyx_v_z_i + 1);
-    if (__pyx_t_31 < 0) __pyx_t_31 += __pyx_bshape_0_table;
-    if (__pyx_t_32 < 0) __pyx_t_32 += __pyx_bshape_1_table;
-    if (__pyx_t_33 < 0) __pyx_t_33 += __pyx_bshape_2_table;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":113
- *                    + table[x_i  ,y_i+1,z_i  ] * (xm*yp*zm) \
- *                    + table[x_i  ,y_i  ,z_i+1] * (xm*ym*zp) \
- *                    + table[x_i+1,y_i  ,z_i+1] * (xp*ym*zp) \             # <<<<<<<<<<<<<<
- *                    + table[x_i  ,y_i+1,z_i+1] * (xm*yp*zp) \
- *                    + table[x_i+1,y_i+1,z_i  ] * (xp*yp*zm) \
- */
-    __pyx_t_34 = (__pyx_v_x_i + 1);
-    __pyx_t_35 = __pyx_v_y_i;
-    __pyx_t_36 = (__pyx_v_z_i + 1);
-    if (__pyx_t_34 < 0) __pyx_t_34 += __pyx_bshape_0_table;
-    if (__pyx_t_35 < 0) __pyx_t_35 += __pyx_bshape_1_table;
-    if (__pyx_t_36 < 0) __pyx_t_36 += __pyx_bshape_2_table;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":114
- *                    + table[x_i  ,y_i  ,z_i+1] * (xm*ym*zp) \
- *                    + table[x_i+1,y_i  ,z_i+1] * (xp*ym*zp) \
- *                    + table[x_i  ,y_i+1,z_i+1] * (xm*yp*zp) \             # <<<<<<<<<<<<<<
- *                    + table[x_i+1,y_i+1,z_i  ] * (xp*yp*zm) \
- *                    + table[x_i+1,y_i+1,z_i+1] * (xp*yp*zp)
- */
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-    __pyx_t_38 = (__pyx_v_y_i + 1);
-    __pyx_t_39 = (__pyx_v_z_i + 1);
-    if (__pyx_t_37 < 0) __pyx_t_37 += __pyx_bshape_0_table;
-    if (__pyx_t_38 < 0) __pyx_t_38 += __pyx_bshape_1_table;
-    if (__pyx_t_39 < 0) __pyx_t_39 += __pyx_bshape_2_table;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":115
- *                    + table[x_i+1,y_i  ,z_i+1] * (xp*ym*zp) \
- *                    + table[x_i  ,y_i+1,z_i+1] * (xm*yp*zp) \
- *                    + table[x_i+1,y_i+1,z_i  ] * (xp*yp*zm) \             # <<<<<<<<<<<<<<
- *                    + table[x_i+1,y_i+1,z_i+1] * (xp*yp*zp)
- */
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-    __pyx_t_41 = (__pyx_v_y_i + 1);
-    __pyx_t_42 = __pyx_v_z_i;
-    if (__pyx_t_40 < 0) __pyx_t_40 += __pyx_bshape_0_table;
-    if (__pyx_t_41 < 0) __pyx_t_41 += __pyx_bshape_1_table;
-    if (__pyx_t_42 < 0) __pyx_t_42 += __pyx_bshape_2_table;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":116
- *                    + table[x_i  ,y_i+1,z_i+1] * (xm*yp*zp) \
- *                    + table[x_i+1,y_i+1,z_i  ] * (xp*yp*zm) \
- *                    + table[x_i+1,y_i+1,z_i+1] * (xp*yp*zp)             # <<<<<<<<<<<<<<
- */
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-    __pyx_t_44 = (__pyx_v_y_i + 1);
-    __pyx_t_45 = (__pyx_v_z_i + 1);
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-    if (__pyx_t_44 < 0) __pyx_t_44 += __pyx_bshape_1_table;
-    if (__pyx_t_45 < 0) __pyx_t_45 += __pyx_bshape_2_table;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":109
- *         ym = (y_bins[y_i+1] - y) * dy_inv
- *         zm = (z_bins[z_i+1] - z) * dz_inv
- *         output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \             # <<<<<<<<<<<<<<
- *                    + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \
- *                    + table[x_i  ,y_i+1,z_i  ] * (xm*yp*zm) \
- */
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- *     cdef np.float64_t dt_tolerance = 1e-6             # <<<<<<<<<<<<<<
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- *     cdef np.float64_t dist, alpha
- *     cdef np.float64_t one = 1.0             # <<<<<<<<<<<<<<
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- *     for i in range(3):             # <<<<<<<<<<<<<<
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- *         y = (i+2)%3             # <<<<<<<<<<<<<<
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-    __pyx_t_8 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_v.buf, __pyx_t_65, __pyx_bstride_0_v));
-    if (unlikely(__pyx_t_8 == 0)) {
-      PyErr_Format(PyExc_ZeroDivisionError, "float division");
-      {__pyx_filename = __pyx_f[4]; __pyx_lineno = 313; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-    }
-    (__pyx_v_tdelta[__pyx_v_i]) = (__pyx_t_6 / __pyx_t_8);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":314
- *         if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
- *         tdelta[i] = (dx[i]/v[i])
- *         if tdelta[i] < 0: tdelta[i] *= -1             # <<<<<<<<<<<<<<
- *     # The variable intersect contains the point we first pierce the grid
- *     enter_t = intersect_t
- */
-    __pyx_t_22 = ((__pyx_v_tdelta[__pyx_v_i]) < 0.0);
-    if (__pyx_t_22) {
-      (__pyx_v_tdelta[__pyx_v_i]) *= -1.0;
-      goto __pyx_L20;
-    }
-    __pyx_L20:;
-  }
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":316
- *         if tdelta[i] < 0: tdelta[i] *= -1
- *     # The variable intersect contains the point we first pierce the grid
- *     enter_t = intersect_t             # <<<<<<<<<<<<<<
- *     if (not (0 <= cur_ind[0] < dims[0])) or \
- *        (not (0 <= cur_ind[1] < dims[1])) or \
- */
-  __pyx_v_enter_t = __pyx_v_intersect_t;
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":317
- *     # The variable intersect contains the point we first pierce the grid
- *     enter_t = intersect_t
- *     if (not (0 <= cur_ind[0] < dims[0])) or \             # <<<<<<<<<<<<<<
- *        (not (0 <= cur_ind[1] < dims[1])) or \
- *        (not (0 <= cur_ind[2] < dims[2])):
- */
-  __pyx_t_51 = (__pyx_v_cur_ind[0]);
-  __pyx_t_22 = (0 <= __pyx_t_51);
-  if (__pyx_t_22) {
-    __pyx_t_22 = (__pyx_t_51 < (__pyx_v_dims[0]));
-  }
-  __pyx_t_3 = (!__pyx_t_22);
-  if (!__pyx_t_3) {
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":318
- *     enter_t = intersect_t
- *     if (not (0 <= cur_ind[0] < dims[0])) or \
- *        (not (0 <= cur_ind[1] < dims[1])) or \             # <<<<<<<<<<<<<<
- *        (not (0 <= cur_ind[2] < dims[2])):
- *         #print "Returning: cur_ind", cur_ind[0], cur_ind[1], cur_ind[2]
- */
-    __pyx_t_51 = (__pyx_v_cur_ind[1]);
-    __pyx_t_22 = (0 <= __pyx_t_51);
-    if (__pyx_t_22) {
-      __pyx_t_22 = (__pyx_t_51 < (__pyx_v_dims[1]));
-    }
-    __pyx_t_18 = (!__pyx_t_22);
-    if (!__pyx_t_18) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":319
- *     if (not (0 <= cur_ind[0] < dims[0])) or \
- *        (not (0 <= cur_ind[1] < dims[1])) or \
- *        (not (0 <= cur_ind[2] < dims[2])):             # <<<<<<<<<<<<<<
- *         #print "Returning: cur_ind", cur_ind[0], cur_ind[1], cur_ind[2]
- *         #print "  dims:     ", dims[0], dims[1], dims[2]
- */
-      __pyx_t_51 = (__pyx_v_cur_ind[2]);
-      __pyx_t_22 = (0 <= __pyx_t_51);
-      if (__pyx_t_22) {
-        __pyx_t_22 = (__pyx_t_51 < (__pyx_v_dims[2]));
-      }
-      __pyx_t_20 = (!__pyx_t_22);
-      __pyx_t_22 = __pyx_t_20;
-    } else {
-      __pyx_t_22 = __pyx_t_18;
-    }
-    __pyx_t_18 = __pyx_t_22;
-  } else {
-    __pyx_t_18 = __pyx_t_3;
-  }
-  if (__pyx_t_18) {
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":326
- *         #print "  u        :", u[0], u[1], u[2]
- *         #
- *         return             # <<<<<<<<<<<<<<
- *     #print cur_ind[0], dims[0], cur_ind[1], dims[1], cur_ind[2], dims[2]
- *     dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]
- */
-    __Pyx_XDECREF(__pyx_r);
-    __pyx_r = Py_None; __Pyx_INCREF(Py_None);
-    goto __pyx_L0;
-    goto __pyx_L21;
-  }
-  __pyx_L21:;
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":328
- *         return
- *     #print cur_ind[0], dims[0], cur_ind[1], dims[1], cur_ind[2], dims[2]
- *     dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]             # <<<<<<<<<<<<<<
- *     #dt = 1e300
- *     while 1:
- */
-  __pyx_t_51 = (__pyx_v_cur_ind[0]);
-  __pyx_t_66 = (__pyx_v_cur_ind[1]);
-  __pyx_t_67 = (__pyx_v_cur_ind[2]);
-  __pyx_v_dv = (*__Pyx_BufPtrStrided3d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_data.buf, __pyx_t_51, __pyx_bstride_0_data, __pyx_t_66, __pyx_bstride_1_data, __pyx_t_67, __pyx_bstride_2_data));
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":330
- *     dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]
- *     #dt = 1e300
- *     while 1:             # <<<<<<<<<<<<<<
- *         if image[ind,3] >= 1.0: break
- *         if (not (0 <= cur_ind[0] < dims[0])) or \
- */
-  while (1) {
-    if (!1) break;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":331
- *     #dt = 1e300
- *     while 1:
- *         if image[ind,3] >= 1.0: break             # <<<<<<<<<<<<<<
- *         if (not (0 <= cur_ind[0] < dims[0])) or \
- *            (not (0 <= cur_ind[1] < dims[1])) or \
- */
-    __pyx_t_1 = __pyx_v_ind;
-    __pyx_t_68 = 3;
-    __pyx_t_18 = ((*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_image.buf, __pyx_t_1, __pyx_bstride_0_image, __pyx_t_68, __pyx_bstride_1_image)) >= 1.0);
-    if (__pyx_t_18) {
-      goto __pyx_L23_break;
-      goto __pyx_L24;
-    }
-    __pyx_L24:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":332
- *     while 1:
- *         if image[ind,3] >= 1.0: break
- *         if (not (0 <= cur_ind[0] < dims[0])) or \             # <<<<<<<<<<<<<<
- *            (not (0 <= cur_ind[1] < dims[1])) or \
- *            (not (0 <= cur_ind[2] < dims[2])):
- */
-    __pyx_t_69 = (__pyx_v_cur_ind[0]);
-    __pyx_t_18 = (0 <= __pyx_t_69);
-    if (__pyx_t_18) {
-      __pyx_t_18 = (__pyx_t_69 < (__pyx_v_dims[0]));
-    }
-    __pyx_t_3 = (!__pyx_t_18);
-    if (!__pyx_t_3) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":333
- *         if image[ind,3] >= 1.0: break
- *         if (not (0 <= cur_ind[0] < dims[0])) or \
- *            (not (0 <= cur_ind[1] < dims[1])) or \             # <<<<<<<<<<<<<<
- *            (not (0 <= cur_ind[2] < dims[2])):
- *             break
- */
-      __pyx_t_69 = (__pyx_v_cur_ind[1]);
-      __pyx_t_18 = (0 <= __pyx_t_69);
-      if (__pyx_t_18) {
-        __pyx_t_18 = (__pyx_t_69 < (__pyx_v_dims[1]));
-      }
-      __pyx_t_22 = (!__pyx_t_18);
-      if (!__pyx_t_22) {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":334
- *         if (not (0 <= cur_ind[0] < dims[0])) or \
- *            (not (0 <= cur_ind[1] < dims[1])) or \
- *            (not (0 <= cur_ind[2] < dims[2])):             # <<<<<<<<<<<<<<
- *             break
- *         # Do our transfer here
- */
-        __pyx_t_69 = (__pyx_v_cur_ind[2]);
-        __pyx_t_18 = (0 <= __pyx_t_69);
-        if (__pyx_t_18) {
-          __pyx_t_18 = (__pyx_t_69 < (__pyx_v_dims[2]));
-        }
-        __pyx_t_20 = (!__pyx_t_18);
-        __pyx_t_18 = __pyx_t_20;
-      } else {
-        __pyx_t_18 = __pyx_t_22;
-      }
-      __pyx_t_22 = __pyx_t_18;
-    } else {
-      __pyx_t_22 = __pyx_t_3;
-    }
-    if (__pyx_t_22) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":335
- *            (not (0 <= cur_ind[1] < dims[1])) or \
- *            (not (0 <= cur_ind[2] < dims[2])):
- *             break             # <<<<<<<<<<<<<<
- *         # Do our transfer here
- *         for n in range(nshells):
- */
-      goto __pyx_L23_break;
-      goto __pyx_L25;
-    }
-    __pyx_L25:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":337
- *             break
- *         # Do our transfer here
- *         for n in range(nshells):             # <<<<<<<<<<<<<<
- *             dist = shells[n, 0] - dv
- *             if dist < shells[n,1]:
- */
-    __pyx_t_70 = __pyx_v_nshells;
-    for (__pyx_t_71 = 0; __pyx_t_71 < __pyx_t_70; __pyx_t_71+=1) {
-      __pyx_v_n = __pyx_t_71;
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":338
- *         # Do our transfer here
- *         for n in range(nshells):
- *             dist = shells[n, 0] - dv             # <<<<<<<<<<<<<<
- *             if dist < shells[n,1]:
- *                 dist = exp(-dist/8.0)
- */
-      __pyx_t_72 = __pyx_v_n;
-      __pyx_t_73 = 0;
-      __pyx_v_dist = ((*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_72, __pyx_bstride_0_shells, __pyx_t_73, __pyx_bstride_1_shells)) - __pyx_v_dv);
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":339
- *         for n in range(nshells):
- *             dist = shells[n, 0] - dv
- *             if dist < shells[n,1]:             # <<<<<<<<<<<<<<
- *                 dist = exp(-dist/8.0)
- *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
- */
-      __pyx_t_74 = __pyx_v_n;
-      __pyx_t_75 = 1;
-      __pyx_t_22 = (__pyx_v_dist < (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_74, __pyx_bstride_0_shells, __pyx_t_75, __pyx_bstride_1_shells)));
-      if (__pyx_t_22) {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":340
- *             dist = shells[n, 0] - dv
- *             if dist < shells[n,1]:
- *                 dist = exp(-dist/8.0)             # <<<<<<<<<<<<<<
- *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
- *                 image[ind,0] += alpha*shells[n,2]*dist
- */
-        __pyx_v_dist = exp(((-__pyx_v_dist) / 8.0));
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":341
- *             if dist < shells[n,1]:
- *                 dist = exp(-dist/8.0)
- *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt             # <<<<<<<<<<<<<<
- *                 image[ind,0] += alpha*shells[n,2]*dist
- *                 image[ind,1] += alpha*shells[n,3]*dist
- */
-        __pyx_t_76 = __pyx_v_n;
-        __pyx_t_77 = 5;
-        __pyx_t_78 = __pyx_v_n;
-        __pyx_t_79 = 5;
-        __pyx_v_alpha = ((1.0 - (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_76, __pyx_bstride_0_shells, __pyx_t_77, __pyx_bstride_1_shells))) * (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_78, __pyx_bstride_0_shells, __pyx_t_79, __pyx_bstride_1_shells)));
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":342
- *                 dist = exp(-dist/8.0)
- *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
- *                 image[ind,0] += alpha*shells[n,2]*dist             # <<<<<<<<<<<<<<
- *                 image[ind,1] += alpha*shells[n,3]*dist
- *                 image[ind,2] += alpha*shells[n,4]*dist
- */
-        __pyx_t_80 = __pyx_v_n;
-        __pyx_t_81 = 2;
-        __pyx_t_82 = __pyx_v_ind;
-        __pyx_t_83 = 0;
-        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_image.buf, __pyx_t_82, __pyx_bstride_0_image, __pyx_t_83, __pyx_bstride_1_image) += ((__pyx_v_alpha * (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_80, __pyx_bstride_0_shells, __pyx_t_81, __pyx_bstride_1_shells))) * __pyx_v_dist);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":343
- *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
- *                 image[ind,0] += alpha*shells[n,2]*dist
- *                 image[ind,1] += alpha*shells[n,3]*dist             # <<<<<<<<<<<<<<
- *                 image[ind,2] += alpha*shells[n,4]*dist
- *                 image[ind,3] += alpha*shells[n,5]*dist
- */
-        __pyx_t_84 = __pyx_v_n;
-        __pyx_t_85 = 3;
-        __pyx_t_86 = __pyx_v_ind;
-        __pyx_t_87 = 1;
-        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_image.buf, __pyx_t_86, __pyx_bstride_0_image, __pyx_t_87, __pyx_bstride_1_image) += ((__pyx_v_alpha * (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_84, __pyx_bstride_0_shells, __pyx_t_85, __pyx_bstride_1_shells))) * __pyx_v_dist);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":344
- *                 image[ind,0] += alpha*shells[n,2]*dist
- *                 image[ind,1] += alpha*shells[n,3]*dist
- *                 image[ind,2] += alpha*shells[n,4]*dist             # <<<<<<<<<<<<<<
- *                 image[ind,3] += alpha*shells[n,5]*dist
- *                 #image[ind,i] += rgba[i]*dist*rgba[3]/dt
- */
-        __pyx_t_88 = __pyx_v_n;
-        __pyx_t_89 = 4;
-        __pyx_t_90 = __pyx_v_ind;
-        __pyx_t_91 = 2;
-        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_image.buf, __pyx_t_90, __pyx_bstride_0_image, __pyx_t_91, __pyx_bstride_1_image) += ((__pyx_v_alpha * (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_88, __pyx_bstride_0_shells, __pyx_t_89, __pyx_bstride_1_shells))) * __pyx_v_dist);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":345
- *                 image[ind,1] += alpha*shells[n,3]*dist
- *                 image[ind,2] += alpha*shells[n,4]*dist
- *                 image[ind,3] += alpha*shells[n,5]*dist             # <<<<<<<<<<<<<<
- *                 #image[ind,i] += rgba[i]*dist*rgba[3]/dt
- *                 #print rgba[i], image[ind,i], dist, dt
- */
-        __pyx_t_92 = __pyx_v_n;
-        __pyx_t_93 = 5;
-        __pyx_t_94 = __pyx_v_ind;
-        __pyx_t_95 = 3;
-        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_image.buf, __pyx_t_94, __pyx_bstride_0_image, __pyx_t_95, __pyx_bstride_1_image) += ((__pyx_v_alpha * (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_92, __pyx_bstride_0_shells, __pyx_t_93, __pyx_bstride_1_shells))) * __pyx_v_dist);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":348
- *                 #image[ind,i] += rgba[i]*dist*rgba[3]/dt
- *                 #print rgba[i], image[ind,i], dist, dt
- *                 break             # <<<<<<<<<<<<<<
- *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
- *             dt = 1.0 - enter_t
- */
-        goto __pyx_L27_break;
-        goto __pyx_L28;
-      }
-      __pyx_L28:;
-    }
-    __pyx_L27_break:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":349
- *                 #print rgba[i], image[ind,i], dist, dt
- *                 break
- *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):             # <<<<<<<<<<<<<<
- *             dt = 1.0 - enter_t
- *             break
- */
-    __pyx_t_22 = ((__pyx_v_tmax[0]) > 1.0);
-    if (__pyx_t_22) {
-      __pyx_t_3 = ((__pyx_v_tmax[1]) > 1.0);
-      if (__pyx_t_3) {
-        __pyx_t_18 = ((__pyx_v_tmax[2]) > 1.0);
-        __pyx_t_20 = __pyx_t_18;
-      } else {
-        __pyx_t_20 = __pyx_t_3;
-      }
-      __pyx_t_3 = __pyx_t_20;
-    } else {
-      __pyx_t_3 = __pyx_t_22;
-    }
-    if (__pyx_t_3) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":350
- *                 break
- *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
- *             dt = 1.0 - enter_t             # <<<<<<<<<<<<<<
- *             break
- *         if tmax[0] < tmax[1]:
- */
-      __pyx_v_dt = (1.0 - __pyx_v_enter_t);
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":351
- *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
- *             dt = 1.0 - enter_t
- *             break             # <<<<<<<<<<<<<<
- *         if tmax[0] < tmax[1]:
- *             if tmax[0] < tmax[2]:
- */
-      goto __pyx_L23_break;
-      goto __pyx_L29;
-    }
-    __pyx_L29:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":352
- *             dt = 1.0 - enter_t
- *             break
- *         if tmax[0] < tmax[1]:             # <<<<<<<<<<<<<<
- *             if tmax[0] < tmax[2]:
- *                 dt = tmax[0] - enter_t
- */
-    __pyx_t_3 = ((__pyx_v_tmax[0]) < (__pyx_v_tmax[1]));
-    if (__pyx_t_3) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":353
- *             break
- *         if tmax[0] < tmax[1]:
- *             if tmax[0] < tmax[2]:             # <<<<<<<<<<<<<<
- *                 dt = tmax[0] - enter_t
- *                 enter_t = tmax[0]
- */
-      __pyx_t_3 = ((__pyx_v_tmax[0]) < (__pyx_v_tmax[2]));
-      if (__pyx_t_3) {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":354
- *         if tmax[0] < tmax[1]:
- *             if tmax[0] < tmax[2]:
- *                 dt = tmax[0] - enter_t             # <<<<<<<<<<<<<<
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-    __pyx_v_vp = ((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)PyTuple_GET_ITEM(__pyx_args, 1));
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-  goto __pyx_L4_argument_unpacking_done;
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-
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-  ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)((struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self)->__pyx_vtab)->calculate_extent(((struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self), __pyx_v_vp, __pyx_v_extrema);
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-  ((struct __pyx_vtabstruct_2yt_9amr_utils_VectorPlane *)__pyx_v_vp->__pyx_vtab)->get_start_stop(__pyx_v_vp, __pyx_v_extrema, __pyx_v_iter);
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- *         iter[0] = iclip(iter[0], 0, vp.nv[0])             # <<<<<<<<<<<<<<
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- *         iter[1] = iclip(iter[1], 0, vp.nv[0])             # <<<<<<<<<<<<<<
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- *         iter[1] = iclip(iter[1], 0, vp.nv[0])
- *         iter[2] = iclip(iter[2], 0, vp.nv[1])             # <<<<<<<<<<<<<<
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- */
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- *         iter[1] = iclip(iter[1], 0, vp.nv[0])
- *         iter[2] = iclip(iter[2], 0, vp.nv[1])
- *         iter[3] = iclip(iter[3], 0, vp.nv[1])             # <<<<<<<<<<<<<<
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- *         if vp.vd_strides[0] == -1:             # <<<<<<<<<<<<<<
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- *             for vi in range(iter[0], iter[1]):             # <<<<<<<<<<<<<<
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-    __pyx_t_2 = (__pyx_v_iter[1]);
-    for (__pyx_t_3 = (__pyx_v_iter[0]); __pyx_t_3 < __pyx_t_2; __pyx_t_3+=1) {
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- *                 for vj in range(iter[2], iter[3]):             # <<<<<<<<<<<<<<
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- *                     self.integrate_ray(v_pos, vp.vp_dir, rgba, tf)
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-        ((struct __pyx_vtabstruct_2yt_9amr_utils_VectorPlane *)__pyx_v_vp->__pyx_vtab)->copy_into(__pyx_v_vp, __pyx_v_vp->vp_pos, __pyx_v_v_pos, __pyx_v_vi, __pyx_v_vj, 3, __pyx_v_vp->vp_strides);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":358
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- *                     self.integrate_ray(v_pos, vp.vp_dir, rgba, tf)
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-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":359
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- *                     self.integrate_ray(v_pos, vp.vp_dir, rgba, tf)             # <<<<<<<<<<<<<<
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- *             for vi in range(vp.nv[0]):             # <<<<<<<<<<<<<<
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- *                 for k in range(2):
- *                     # This should rotate it into the vector plane
- *                     temp  = edges[i][0] * vp.x_vec[0]             # <<<<<<<<<<<<<<
- *                     temp += edges[j][1] * vp.x_vec[1]
- *                     temp += edges[k][2] * vp.x_vec[2]
- */
-        __pyx_v_temp = (((__pyx_v_edges[__pyx_v_i])[0]) * (__pyx_v_vp->x_vec[0]));
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":388
- *                     # This should rotate it into the vector plane
- *                     temp  = edges[i][0] * vp.x_vec[0]
- *                     temp += edges[j][1] * vp.x_vec[1]             # <<<<<<<<<<<<<<
- *                     temp += edges[k][2] * vp.x_vec[2]
- *                     if temp < extrema[0]: extrema[0] = temp
- */
-        __pyx_v_temp += (((__pyx_v_edges[__pyx_v_j])[1]) * (__pyx_v_vp->x_vec[1]));
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":389
- *                     temp  = edges[i][0] * vp.x_vec[0]
- *                     temp += edges[j][1] * vp.x_vec[1]
- *                     temp += edges[k][2] * vp.x_vec[2]             # <<<<<<<<<<<<<<
- *                     if temp < extrema[0]: extrema[0] = temp
- *                     if temp > extrema[1]: extrema[1] = temp
- */
-        __pyx_v_temp += (((__pyx_v_edges[__pyx_v_k])[2]) * (__pyx_v_vp->x_vec[2]));
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":390
- *                     temp += edges[j][1] * vp.x_vec[1]
- *                     temp += edges[k][2] * vp.x_vec[2]
- *                     if temp < extrema[0]: extrema[0] = temp             # <<<<<<<<<<<<<<
- *                     if temp > extrema[1]: extrema[1] = temp
- *                     temp  = edges[i][0] * vp.y_vec[0]
- */
-        __pyx_t_5 = (__pyx_v_temp < (__pyx_v_extrema[0]));
-        if (__pyx_t_5) {
-          (__pyx_v_extrema[0]) = __pyx_v_temp;
-          goto __pyx_L9;
-        }
-        __pyx_L9:;
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":391
- *                     temp += edges[k][2] * vp.x_vec[2]
- *                     if temp < extrema[0]: extrema[0] = temp
- *                     if temp > extrema[1]: extrema[1] = temp             # <<<<<<<<<<<<<<
- *                     temp  = edges[i][0] * vp.y_vec[0]
- *                     temp += edges[j][1] * vp.y_vec[1]
- */
-        __pyx_t_5 = (__pyx_v_temp > (__pyx_v_extrema[1]));
-        if (__pyx_t_5) {
-          (__pyx_v_extrema[1]) = __pyx_v_temp;
-          goto __pyx_L10;
-        }
-        __pyx_L10:;
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":392
- *                     if temp < extrema[0]: extrema[0] = temp
- *                     if temp > extrema[1]: extrema[1] = temp
- *                     temp  = edges[i][0] * vp.y_vec[0]             # <<<<<<<<<<<<<<
- *                     temp += edges[j][1] * vp.y_vec[1]
- *                     temp += edges[k][2] * vp.y_vec[2]
- */
-        __pyx_v_temp = (((__pyx_v_edges[__pyx_v_i])[0]) * (__pyx_v_vp->y_vec[0]));
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":393
- *                     if temp > extrema[1]: extrema[1] = temp
- *                     temp  = edges[i][0] * vp.y_vec[0]
- *                     temp += edges[j][1] * vp.y_vec[1]             # <<<<<<<<<<<<<<
- *                     temp += edges[k][2] * vp.y_vec[2]
- *                     if temp < extrema[2]: extrema[2] = temp
- */
-        __pyx_v_temp += (((__pyx_v_edges[__pyx_v_j])[1]) * (__pyx_v_vp->y_vec[1]));
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":394
- *                     temp  = edges[i][0] * vp.y_vec[0]
- *                     temp += edges[j][1] * vp.y_vec[1]
- *                     temp += edges[k][2] * vp.y_vec[2]             # <<<<<<<<<<<<<<
- *                     if temp < extrema[2]: extrema[2] = temp
- *                     if temp > extrema[3]: extrema[3] = temp
- */
-        __pyx_v_temp += (((__pyx_v_edges[__pyx_v_k])[2]) * (__pyx_v_vp->y_vec[2]));
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":395
- *                     temp += edges[j][1] * vp.y_vec[1]
- *                     temp += edges[k][2] * vp.y_vec[2]
- *                     if temp < extrema[2]: extrema[2] = temp             # <<<<<<<<<<<<<<
- *                     if temp > extrema[3]: extrema[3] = temp
- *         #print extrema[0], extrema[1], extrema[2], extrema[3]
- */
-        __pyx_t_5 = (__pyx_v_temp < (__pyx_v_extrema[2]));
-        if (__pyx_t_5) {
-          (__pyx_v_extrema[2]) = __pyx_v_temp;
-          goto __pyx_L11;
-        }
-        __pyx_L11:;
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":396
- *                     temp += edges[k][2] * vp.y_vec[2]
- *                     if temp < extrema[2]: extrema[2] = temp
- *                     if temp > extrema[3]: extrema[3] = temp             # <<<<<<<<<<<<<<
- *         #print extrema[0], extrema[1], extrema[2], extrema[3]
- * 
- */
-        __pyx_t_5 = (__pyx_v_temp > (__pyx_v_extrema[3]));
-        if (__pyx_t_5) {
-          (__pyx_v_extrema[3]) = __pyx_v_temp;
-          goto __pyx_L12;
-        }
-        __pyx_L12:;
-      }
-    }
-  }
-
-  __Pyx_RefNannyFinishContext();
-}
-
-/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":401
- *     @cython.boundscheck(False)
- *     @cython.wraparound(False)
- *     cdef int integrate_ray(self, np.float64_t v_pos[3],             # <<<<<<<<<<<<<<
- *                                  np.float64_t v_dir[3],
- *                                  np.float64_t rgba[4],
- */
-
-static  int __pyx_f_2yt_9amr_utils_15PartitionedGrid_integrate_ray(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *__pyx_v_self, __pyx_t_5numpy_float64_t *__pyx_v_v_pos, __pyx_t_5numpy_float64_t *__pyx_v_v_dir, __pyx_t_5numpy_float64_t *__pyx_v_rgba, struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *__pyx_v_tf) {
-  int __pyx_v_cur_ind[3];
-  int __pyx_v_step[3];
-  int __pyx_v_x;
-  int __pyx_v_y;
-  int __pyx_v_i;
-  int __pyx_v_hit;
-  int __pyx_v_direction;
-  __pyx_t_5numpy_float64_t __pyx_v_intersect_t;
-  __pyx_t_5numpy_float64_t __pyx_v_iv_dir[3];
-  __pyx_t_5numpy_float64_t __pyx_v_intersect[3];
-  __pyx_t_5numpy_float64_t __pyx_v_tmax[3];
-  __pyx_t_5numpy_float64_t __pyx_v_tdelta[3];
-  __pyx_t_5numpy_float64_t __pyx_v_enter_t;
-  __pyx_t_5numpy_float64_t __pyx_v_exit_t;
-  __pyx_t_5numpy_float64_t __pyx_v_tr;
-  __pyx_t_5numpy_float64_t __pyx_v_tl;
-  __pyx_t_5numpy_float64_t __pyx_v_temp_x;
-  __pyx_t_5numpy_float64_t __pyx_v_temp_y;
-  int __pyx_r;
-  int __pyx_t_1;
-  int __pyx_t_2;
-  __pyx_t_5numpy_float64_t __pyx_t_3;
-  int __pyx_t_4;
-  int __pyx_t_5;
-  int __pyx_t_6;
-  int __pyx_t_7;
-  int __pyx_t_8;
-  int __pyx_t_9;
-  __Pyx_RefNannySetupContext("integrate_ray");
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":406
- *                                  TransferFunctionProxy tf):
- *         cdef int cur_ind[3], step[3], x, y, i, n, flat_ind, hit, direction
- *         cdef np.float64_t intersect_t = 1.0             # <<<<<<<<<<<<<<
- *         cdef np.float64_t iv_dir[3]
- *         cdef np.float64_t intersect[3], tmax[3], tdelta[3]
- */
-  __pyx_v_intersect_t = 1.0;
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":411
- *         cdef np.float64_t enter_t, dist, alpha, dt, exit_t
- *         cdef np.float64_t tr, tl, temp_x, temp_y, dv
- *         for i in range(3):             # <<<<<<<<<<<<<<
- *             if (v_dir[i] < 0):
- *                 step[i] = -1
- */
-  for (__pyx_t_1 = 0; __pyx_t_1 < 3; __pyx_t_1+=1) {
-    __pyx_v_i = __pyx_t_1;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":412
- *         cdef np.float64_t tr, tl, temp_x, temp_y, dv
- *         for i in range(3):
- *             if (v_dir[i] < 0):             # <<<<<<<<<<<<<<
- *                 step[i] = -1
- *             elif (v_dir[i] == 0):
- */
-    __pyx_t_2 = ((__pyx_v_v_dir[__pyx_v_i]) < 0.0);
-    if (__pyx_t_2) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":413
- *         for i in range(3):
- *             if (v_dir[i] < 0):
- *                 step[i] = -1             # <<<<<<<<<<<<<<
- *             elif (v_dir[i] == 0):
- *                 step[i] = 1
- */
-      (__pyx_v_step[__pyx_v_i]) = -1;
-      goto __pyx_L5;
-    }
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":414
- *             if (v_dir[i] < 0):
- *                 step[i] = -1
- *             elif (v_dir[i] == 0):             # <<<<<<<<<<<<<<
- *                 step[i] = 1
- *                 tmax[i] = 1e60
- */
-    __pyx_t_2 = ((__pyx_v_v_dir[__pyx_v_i]) == 0.0);
-    if (__pyx_t_2) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":415
- *                 step[i] = -1
- *             elif (v_dir[i] == 0):
- *                 step[i] = 1             # <<<<<<<<<<<<<<
- *                 tmax[i] = 1e60
- *                 iv_dir[i] = 1e60
- */
-      (__pyx_v_step[__pyx_v_i]) = 1;
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":416
- *             elif (v_dir[i] == 0):
- *                 step[i] = 1
- *                 tmax[i] = 1e60             # <<<<<<<<<<<<<<
- *                 iv_dir[i] = 1e60
- *                 tdelta[i] = 1e-60
- */
-      (__pyx_v_tmax[__pyx_v_i]) = 1e60;
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":417
- *                 step[i] = 1
- *                 tmax[i] = 1e60
- *                 iv_dir[i] = 1e60             # <<<<<<<<<<<<<<
- *                 tdelta[i] = 1e-60
- *                 continue
- */
-      (__pyx_v_iv_dir[__pyx_v_i]) = 1e60;
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":418
- *                 tmax[i] = 1e60
- *                 iv_dir[i] = 1e60
- *                 tdelta[i] = 1e-60             # <<<<<<<<<<<<<<
- *                 continue
- *             else:
- */
-      (__pyx_v_tdelta[__pyx_v_i]) = 1e-60;
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":419
- *                 iv_dir[i] = 1e60
- *                 tdelta[i] = 1e-60
- *                 continue             # <<<<<<<<<<<<<<
- *             else:
- *                 step[i] = 1
- */
-      goto __pyx_L3_continue;
-      goto __pyx_L5;
-    }
-    /*else*/ {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":421
- *                 continue
- *             else:
- *                 step[i] = 1             # <<<<<<<<<<<<<<
- *             x = (i+1) % 3
- *             y = (i+2) % 3
- */
-      (__pyx_v_step[__pyx_v_i]) = 1;
-    }
-    __pyx_L5:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":422
- *             else:
- *                 step[i] = 1
- *             x = (i+1) % 3             # <<<<<<<<<<<<<<
- *             y = (i+2) % 3
- *             iv_dir[i] = 1.0/v_dir[i]
- */
-    __pyx_v_x = __Pyx_mod_long((__pyx_v_i + 1), 3);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":423
- *                 step[i] = 1
- *             x = (i+1) % 3
- *             y = (i+2) % 3             # <<<<<<<<<<<<<<
- *             iv_dir[i] = 1.0/v_dir[i]
- *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
- */
-    __pyx_v_y = __Pyx_mod_long((__pyx_v_i + 2), 3);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":424
- *             x = (i+1) % 3
- *             y = (i+2) % 3
- *             iv_dir[i] = 1.0/v_dir[i]             # <<<<<<<<<<<<<<
- *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
- *             temp_x = (v_pos[x] + tl*v_dir[x])
- */
-    __pyx_t_3 = (__pyx_v_v_dir[__pyx_v_i]);
-    if (unlikely(__pyx_t_3 == 0)) {
-      PyErr_Format(PyExc_ZeroDivisionError, "float division");
-      {__pyx_filename = __pyx_f[2]; __pyx_lineno = 424; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-    }
-    (__pyx_v_iv_dir[__pyx_v_i]) = (1.0 / __pyx_t_3);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":425
- *             y = (i+2) % 3
- *             iv_dir[i] = 1.0/v_dir[i]
- *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]             # <<<<<<<<<<<<<<
- *             temp_x = (v_pos[x] + tl*v_dir[x])
- *             temp_y = (v_pos[y] + tl*v_dir[y])
- */
-    __pyx_v_tl = (((__pyx_v_self->left_edge[__pyx_v_i]) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":426
- *             iv_dir[i] = 1.0/v_dir[i]
- *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
- *             temp_x = (v_pos[x] + tl*v_dir[x])             # <<<<<<<<<<<<<<
- *             temp_y = (v_pos[y] + tl*v_dir[y])
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
- */
-    __pyx_v_temp_x = ((__pyx_v_v_pos[__pyx_v_x]) + (__pyx_v_tl * (__pyx_v_v_dir[__pyx_v_x])));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":427
- *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
- *             temp_x = (v_pos[x] + tl*v_dir[x])
- *             temp_y = (v_pos[y] + tl*v_dir[y])             # <<<<<<<<<<<<<<
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
- */
-    __pyx_v_temp_y = ((__pyx_v_v_pos[__pyx_v_y]) + (__pyx_v_tl * (__pyx_v_v_dir[__pyx_v_y])));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":428
- *             temp_x = (v_pos[x] + tl*v_dir[x])
- *             temp_y = (v_pos[y] + tl*v_dir[y])
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \             # <<<<<<<<<<<<<<
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
- *                0.0 <= tl and tl < intersect_t:
- */
-    __pyx_t_2 = ((__pyx_v_self->left_edge[__pyx_v_x]) <= __pyx_v_temp_x);
-    if (__pyx_t_2) {
-      __pyx_t_4 = (__pyx_v_temp_x <= (__pyx_v_self->right_edge[__pyx_v_x]));
-      if (__pyx_t_4) {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":429
- *             temp_y = (v_pos[y] + tl*v_dir[y])
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \             # <<<<<<<<<<<<<<
- *                0.0 <= tl and tl < intersect_t:
- *                 direction = i
- */
-        __pyx_t_5 = ((__pyx_v_self->left_edge[__pyx_v_y]) <= __pyx_v_temp_y);
-        if (__pyx_t_5) {
-          __pyx_t_6 = (__pyx_v_temp_y <= (__pyx_v_self->right_edge[__pyx_v_y]));
-          if (__pyx_t_6) {
-
-            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":430
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
- *                0.0 <= tl and tl < intersect_t:             # <<<<<<<<<<<<<<
- *                 direction = i
- *                 intersect_t = tl
- */
-            __pyx_t_7 = (0.0 <= __pyx_v_tl);
-            if (__pyx_t_7) {
-              __pyx_t_8 = (__pyx_v_tl < __pyx_v_intersect_t);
-              __pyx_t_9 = __pyx_t_8;
-            } else {
-              __pyx_t_9 = __pyx_t_7;
-            }
-            __pyx_t_7 = __pyx_t_9;
-          } else {
-            __pyx_t_7 = __pyx_t_6;
-          }
-          __pyx_t_6 = __pyx_t_7;
-        } else {
-          __pyx_t_6 = __pyx_t_5;
-        }
-        __pyx_t_5 = __pyx_t_6;
-      } else {
-        __pyx_t_5 = __pyx_t_4;
-      }
-      __pyx_t_4 = __pyx_t_5;
-    } else {
-      __pyx_t_4 = __pyx_t_2;
-    }
-    if (__pyx_t_4) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":431
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
- *                0.0 <= tl and tl < intersect_t:
- *                 direction = i             # <<<<<<<<<<<<<<
- *                 intersect_t = tl
- *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
- */
-      __pyx_v_direction = __pyx_v_i;
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":432
- *                0.0 <= tl and tl < intersect_t:
- *                 direction = i
- *                 intersect_t = tl             # <<<<<<<<<<<<<<
- *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
- *             temp_x = (v_pos[x] + tr*v_dir[x])
- */
-      __pyx_v_intersect_t = __pyx_v_tl;
-      goto __pyx_L6;
-    }
-    __pyx_L6:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":433
- *                 direction = i
- *                 intersect_t = tl
- *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]             # <<<<<<<<<<<<<<
- *             temp_x = (v_pos[x] + tr*v_dir[x])
- *             temp_y = (v_pos[y] + tr*v_dir[y])
- */
-    __pyx_v_tr = (((__pyx_v_self->right_edge[__pyx_v_i]) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":434
- *                 intersect_t = tl
- *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
- *             temp_x = (v_pos[x] + tr*v_dir[x])             # <<<<<<<<<<<<<<
- *             temp_y = (v_pos[y] + tr*v_dir[y])
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
- */
-    __pyx_v_temp_x = ((__pyx_v_v_pos[__pyx_v_x]) + (__pyx_v_tr * (__pyx_v_v_dir[__pyx_v_x])));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":435
- *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
- *             temp_x = (v_pos[x] + tr*v_dir[x])
- *             temp_y = (v_pos[y] + tr*v_dir[y])             # <<<<<<<<<<<<<<
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
- */
-    __pyx_v_temp_y = ((__pyx_v_v_pos[__pyx_v_y]) + (__pyx_v_tr * (__pyx_v_v_dir[__pyx_v_y])));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":436
- *             temp_x = (v_pos[x] + tr*v_dir[x])
- *             temp_y = (v_pos[y] + tr*v_dir[y])
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \             # <<<<<<<<<<<<<<
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
- *                0.0 <= tr and tr < intersect_t:
- */
-    __pyx_t_4 = ((__pyx_v_self->left_edge[__pyx_v_x]) <= __pyx_v_temp_x);
-    if (__pyx_t_4) {
-      __pyx_t_2 = (__pyx_v_temp_x <= (__pyx_v_self->right_edge[__pyx_v_x]));
-      if (__pyx_t_2) {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":437
- *             temp_y = (v_pos[y] + tr*v_dir[y])
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \             # <<<<<<<<<<<<<<
- *                0.0 <= tr and tr < intersect_t:
- *                 direction = i
- */
-        __pyx_t_5 = ((__pyx_v_self->left_edge[__pyx_v_y]) <= __pyx_v_temp_y);
-        if (__pyx_t_5) {
-          __pyx_t_6 = (__pyx_v_temp_y <= (__pyx_v_self->right_edge[__pyx_v_y]));
-          if (__pyx_t_6) {
-
-            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":438
- *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
- *                0.0 <= tr and tr < intersect_t:             # <<<<<<<<<<<<<<
- *                 direction = i
- *                 intersect_t = tr
- */
-            __pyx_t_7 = (0.0 <= __pyx_v_tr);
-            if (__pyx_t_7) {
-              __pyx_t_9 = (__pyx_v_tr < __pyx_v_intersect_t);
-              __pyx_t_8 = __pyx_t_9;
-            } else {
-              __pyx_t_8 = __pyx_t_7;
-            }
-            __pyx_t_7 = __pyx_t_8;
-          } else {
-            __pyx_t_7 = __pyx_t_6;
-          }
-          __pyx_t_6 = __pyx_t_7;
-        } else {
-          __pyx_t_6 = __pyx_t_5;
-        }
-        __pyx_t_5 = __pyx_t_6;
-      } else {
-        __pyx_t_5 = __pyx_t_2;
-      }
-      __pyx_t_2 = __pyx_t_5;
-    } else {
-      __pyx_t_2 = __pyx_t_4;
-    }
-    if (__pyx_t_2) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":439
- *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
- *                0.0 <= tr and tr < intersect_t:
- *                 direction = i             # <<<<<<<<<<<<<<
- *                 intersect_t = tr
- *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
- */
-      __pyx_v_direction = __pyx_v_i;
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":440
- *                0.0 <= tr and tr < intersect_t:
- *                 direction = i
- *                 intersect_t = tr             # <<<<<<<<<<<<<<
- *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
- *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
- */
-      __pyx_v_intersect_t = __pyx_v_tr;
-      goto __pyx_L7;
-    }
-    __pyx_L7:;
-    __pyx_L3_continue:;
-  }
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":441
- *                 direction = i
- *                 intersect_t = tr
- *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \             # <<<<<<<<<<<<<<
- *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
- *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
- */
-  __pyx_t_2 = ((__pyx_v_self->left_edge[0]) <= (__pyx_v_v_pos[0]));
-  if (__pyx_t_2) {
-    __pyx_t_4 = ((__pyx_v_v_pos[0]) <= (__pyx_v_self->right_edge[0]));
-    if (__pyx_t_4) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":442
- *                 intersect_t = tr
- *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
- *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \             # <<<<<<<<<<<<<<
- *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
- *             intersect_t = 0.0
- */
-      __pyx_t_5 = ((__pyx_v_self->left_edge[1]) <= (__pyx_v_v_pos[1]));
-      if (__pyx_t_5) {
-        __pyx_t_6 = ((__pyx_v_v_pos[1]) <= (__pyx_v_self->right_edge[1]));
-        if (__pyx_t_6) {
-
-          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":443
- *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
- *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
- *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:             # <<<<<<<<<<<<<<
- *             intersect_t = 0.0
- *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
- */
-          __pyx_t_7 = ((__pyx_v_self->left_edge[2]) <= (__pyx_v_v_pos[2]));
-          if (__pyx_t_7) {
-            __pyx_t_8 = ((__pyx_v_v_pos[2]) <= (__pyx_v_self->right_edge[2]));
-            __pyx_t_9 = __pyx_t_8;
-          } else {
-            __pyx_t_9 = __pyx_t_7;
-          }
-          __pyx_t_7 = __pyx_t_9;
-        } else {
-          __pyx_t_7 = __pyx_t_6;
-        }
-        __pyx_t_6 = __pyx_t_7;
-      } else {
-        __pyx_t_6 = __pyx_t_5;
-      }
-      __pyx_t_5 = __pyx_t_6;
-    } else {
-      __pyx_t_5 = __pyx_t_4;
-    }
-    __pyx_t_4 = __pyx_t_5;
-  } else {
-    __pyx_t_4 = __pyx_t_2;
-  }
-  if (__pyx_t_4) {
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":444
- *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
- *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
- *             intersect_t = 0.0             # <<<<<<<<<<<<<<
- *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
- *         for i in range(3):
- */
-    __pyx_v_intersect_t = 0.0;
-    goto __pyx_L8;
-  }
-  __pyx_L8:;
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":445
- *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
- *             intersect_t = 0.0
- *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0             # <<<<<<<<<<<<<<
- *         for i in range(3):
- *             intersect[i] = v_pos[i] + intersect_t * v_dir[i]
- */
-  __pyx_t_4 = (0.0 <= __pyx_v_intersect_t);
-  if (__pyx_t_4) {
-    __pyx_t_2 = (__pyx_v_intersect_t < 1.0);
-    __pyx_t_5 = __pyx_t_2;
-  } else {
-    __pyx_t_5 = __pyx_t_4;
-  }
-  __pyx_t_4 = (!__pyx_t_5);
-  if (__pyx_t_4) {
-    __pyx_r = 0;
-    goto __pyx_L0;
-    goto __pyx_L9;
-  }
-  __pyx_L9:;
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":446
- *             intersect_t = 0.0
- *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
- *         for i in range(3):             # <<<<<<<<<<<<<<
- *             intersect[i] = v_pos[i] + intersect_t * v_dir[i]
- *             cur_ind[i] = <int> floor((intersect[i] +
- */
-  for (__pyx_t_1 = 0; __pyx_t_1 < 3; __pyx_t_1+=1) {
-    __pyx_v_i = __pyx_t_1;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":447
- *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
- *         for i in range(3):
- *             intersect[i] = v_pos[i] + intersect_t * v_dir[i]             # <<<<<<<<<<<<<<
- *             cur_ind[i] = <int> floor((intersect[i] +
- *                                       step[i]*1e-8*self.dds[i] -
- */
-    (__pyx_v_intersect[__pyx_v_i]) = ((__pyx_v_v_pos[__pyx_v_i]) + (__pyx_v_intersect_t * (__pyx_v_v_dir[__pyx_v_i])));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":448
- *         for i in range(3):
- *             intersect[i] = v_pos[i] + intersect_t * v_dir[i]
- *             cur_ind[i] = <int> floor((intersect[i] +             # <<<<<<<<<<<<<<
- *                                       step[i]*1e-8*self.dds[i] -
- *                                       self.left_edge[i])*self.idds[i])
- */
-    (__pyx_v_cur_ind[__pyx_v_i]) = ((int)floor(((((__pyx_v_intersect[__pyx_v_i]) + (((__pyx_v_step[__pyx_v_i]) * 1e-8) * (__pyx_v_self->dds[__pyx_v_i]))) - (__pyx_v_self->left_edge[__pyx_v_i])) * (__pyx_v_self->idds[__pyx_v_i]))));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":451
- *                                       step[i]*1e-8*self.dds[i] -
- *                                       self.left_edge[i])*self.idds[i])
- *             tmax[i] = (((cur_ind[i]+step[i])*self.dds[i])+             # <<<<<<<<<<<<<<
- *                         self.left_edge[i]-v_pos[i])*iv_dir[i]
- *             # This deals with the asymmetry in having our indices refer to the
- */
-    (__pyx_v_tmax[__pyx_v_i]) = ((((((__pyx_v_cur_ind[__pyx_v_i]) + (__pyx_v_step[__pyx_v_i])) * (__pyx_v_self->dds[__pyx_v_i])) + (__pyx_v_self->left_edge[__pyx_v_i])) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":456
- *             # left edge of a cell, but the right edge of the brick being one
- *             # extra zone out.
- *             if cur_ind[i] == self.dims[i] and step[i] < 0:             # <<<<<<<<<<<<<<
- *                 cur_ind[i] = self.dims[i] - 1
- *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
- */
-    __pyx_t_4 = ((__pyx_v_cur_ind[__pyx_v_i]) == (__pyx_v_self->dims[__pyx_v_i]));
-    if (__pyx_t_4) {
-      __pyx_t_5 = ((__pyx_v_step[__pyx_v_i]) < 0);
-      __pyx_t_2 = __pyx_t_5;
-    } else {
-      __pyx_t_2 = __pyx_t_4;
-    }
-    if (__pyx_t_2) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":457
- *             # extra zone out.
- *             if cur_ind[i] == self.dims[i] and step[i] < 0:
- *                 cur_ind[i] = self.dims[i] - 1             # <<<<<<<<<<<<<<
- *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
- *             if step[i] > 0:
- */
-      (__pyx_v_cur_ind[__pyx_v_i]) = ((__pyx_v_self->dims[__pyx_v_i]) - 1);
-      goto __pyx_L12;
-    }
-    __pyx_L12:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":458
- *             if cur_ind[i] == self.dims[i] and step[i] < 0:
- *                 cur_ind[i] = self.dims[i] - 1
- *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0             # <<<<<<<<<<<<<<
- *             if step[i] > 0:
- *                 tmax[i] = (((cur_ind[i]+1)*self.dds[i])
- */
-    __pyx_t_2 = ((__pyx_v_cur_ind[__pyx_v_i]) < 0);
-    if (!__pyx_t_2) {
-      __pyx_t_4 = ((__pyx_v_cur_ind[__pyx_v_i]) >= (__pyx_v_self->dims[__pyx_v_i]));
-      __pyx_t_5 = __pyx_t_4;
-    } else {
-      __pyx_t_5 = __pyx_t_2;
-    }
-    if (__pyx_t_5) {
-      __pyx_r = 0;
-      goto __pyx_L0;
-      goto __pyx_L13;
-    }
-    __pyx_L13:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":459
- *                 cur_ind[i] = self.dims[i] - 1
- *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
- *             if step[i] > 0:             # <<<<<<<<<<<<<<
- *                 tmax[i] = (((cur_ind[i]+1)*self.dds[i])
- *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
- */
-    __pyx_t_5 = ((__pyx_v_step[__pyx_v_i]) > 0);
-    if (__pyx_t_5) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":460
- *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
- *             if step[i] > 0:
- *                 tmax[i] = (((cur_ind[i]+1)*self.dds[i])             # <<<<<<<<<<<<<<
- *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
- *             if step[i] < 0:
- */
-      (__pyx_v_tmax[__pyx_v_i]) = ((((((__pyx_v_cur_ind[__pyx_v_i]) + 1) * (__pyx_v_self->dds[__pyx_v_i])) + (__pyx_v_self->left_edge[__pyx_v_i])) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
-      goto __pyx_L14;
-    }
-    __pyx_L14:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":462
- *                 tmax[i] = (((cur_ind[i]+1)*self.dds[i])
- *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
- *             if step[i] < 0:             # <<<<<<<<<<<<<<
- *                 tmax[i] = (((cur_ind[i]+0)*self.dds[i])
- *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
- */
-    __pyx_t_5 = ((__pyx_v_step[__pyx_v_i]) < 0);
-    if (__pyx_t_5) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":463
- *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
- *             if step[i] < 0:
- *                 tmax[i] = (((cur_ind[i]+0)*self.dds[i])             # <<<<<<<<<<<<<<
- *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
- *             tdelta[i] = (self.dds[i]*iv_dir[i])
- */
-      (__pyx_v_tmax[__pyx_v_i]) = ((((((__pyx_v_cur_ind[__pyx_v_i]) + 0) * (__pyx_v_self->dds[__pyx_v_i])) + (__pyx_v_self->left_edge[__pyx_v_i])) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
-      goto __pyx_L15;
-    }
-    __pyx_L15:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":465
- *                 tmax[i] = (((cur_ind[i]+0)*self.dds[i])
- *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
- *             tdelta[i] = (self.dds[i]*iv_dir[i])             # <<<<<<<<<<<<<<
- *             if tdelta[i] < 0: tdelta[i] *= -1
- *         # We have to jumpstart our calculation
- */
-    (__pyx_v_tdelta[__pyx_v_i]) = ((__pyx_v_self->dds[__pyx_v_i]) * (__pyx_v_iv_dir[__pyx_v_i]));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":466
- *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
- *             tdelta[i] = (self.dds[i]*iv_dir[i])
- *             if tdelta[i] < 0: tdelta[i] *= -1             # <<<<<<<<<<<<<<
- *         # We have to jumpstart our calculation
- *         enter_t = intersect_t
- */
-    __pyx_t_5 = ((__pyx_v_tdelta[__pyx_v_i]) < 0.0);
-    if (__pyx_t_5) {
-      (__pyx_v_tdelta[__pyx_v_i]) *= -1.0;
-      goto __pyx_L16;
-    }
-    __pyx_L16:;
-  }
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":468
- *             if tdelta[i] < 0: tdelta[i] *= -1
- *         # We have to jumpstart our calculation
- *         enter_t = intersect_t             # <<<<<<<<<<<<<<
- *         while 1:
- *             # dims here is one less than the dimensions of the data,
- */
-  __pyx_v_enter_t = __pyx_v_intersect_t;
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":469
- *         # We have to jumpstart our calculation
- *         enter_t = intersect_t
- *         while 1:             # <<<<<<<<<<<<<<
- *             # dims here is one less than the dimensions of the data,
- *             # but we are tracing on the grid, not on the data...
- */
-  while (1) {
-    if (!1) break;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":472
- *             # dims here is one less than the dimensions of the data,
- *             # but we are tracing on the grid, not on the data...
- *             if (not (0 <= cur_ind[0] < self.dims[0])) or \             # <<<<<<<<<<<<<<
- *                (not (0 <= cur_ind[1] < self.dims[1])) or \
- *                (not (0 <= cur_ind[2] < self.dims[2])):
- */
-    __pyx_t_1 = (__pyx_v_cur_ind[0]);
-    __pyx_t_5 = (0 <= __pyx_t_1);
-    if (__pyx_t_5) {
-      __pyx_t_5 = (__pyx_t_1 < (__pyx_v_self->dims[0]));
-    }
-    __pyx_t_2 = (!__pyx_t_5);
-    if (!__pyx_t_2) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":473
- *             # but we are tracing on the grid, not on the data...
- *             if (not (0 <= cur_ind[0] < self.dims[0])) or \
- *                (not (0 <= cur_ind[1] < self.dims[1])) or \             # <<<<<<<<<<<<<<
- *                (not (0 <= cur_ind[2] < self.dims[2])):
- *                 break
- */
-      __pyx_t_1 = (__pyx_v_cur_ind[1]);
-      __pyx_t_5 = (0 <= __pyx_t_1);
-      if (__pyx_t_5) {
-        __pyx_t_5 = (__pyx_t_1 < (__pyx_v_self->dims[1]));
-      }
-      __pyx_t_4 = (!__pyx_t_5);
-      if (!__pyx_t_4) {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":474
- *             if (not (0 <= cur_ind[0] < self.dims[0])) or \
- *                (not (0 <= cur_ind[1] < self.dims[1])) or \
- *                (not (0 <= cur_ind[2] < self.dims[2])):             # <<<<<<<<<<<<<<
- *                 break
- *             hit += 1
- */
-        __pyx_t_1 = (__pyx_v_cur_ind[2]);
-        __pyx_t_5 = (0 <= __pyx_t_1);
-        if (__pyx_t_5) {
-          __pyx_t_5 = (__pyx_t_1 < (__pyx_v_self->dims[2]));
-        }
-        __pyx_t_6 = (!__pyx_t_5);
-        __pyx_t_5 = __pyx_t_6;
-      } else {
-        __pyx_t_5 = __pyx_t_4;
-      }
-      __pyx_t_4 = __pyx_t_5;
-    } else {
-      __pyx_t_4 = __pyx_t_2;
-    }
-    if (__pyx_t_4) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":475
- *                (not (0 <= cur_ind[1] < self.dims[1])) or \
- *                (not (0 <= cur_ind[2] < self.dims[2])):
- *                 break             # <<<<<<<<<<<<<<
- *             hit += 1
- *             if tmax[0] < tmax[1]:
- */
-      goto __pyx_L18_break;
-      goto __pyx_L19;
-    }
-    __pyx_L19:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":476
- *                (not (0 <= cur_ind[2] < self.dims[2])):
- *                 break
- *             hit += 1             # <<<<<<<<<<<<<<
- *             if tmax[0] < tmax[1]:
- *                 if tmax[0] < tmax[2]:
- */
-    __pyx_v_hit += 1;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":477
- *                 break
- *             hit += 1
- *             if tmax[0] < tmax[1]:             # <<<<<<<<<<<<<<
- *                 if tmax[0] < tmax[2]:
- *                     exit_t = fmin(tmax[0], 1.0)
- */
-    __pyx_t_4 = ((__pyx_v_tmax[0]) < (__pyx_v_tmax[1]));
-    if (__pyx_t_4) {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":478
- *             hit += 1
- *             if tmax[0] < tmax[1]:
- *                 if tmax[0] < tmax[2]:             # <<<<<<<<<<<<<<
- *                     exit_t = fmin(tmax[0], 1.0)
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- */
-      __pyx_t_4 = ((__pyx_v_tmax[0]) < (__pyx_v_tmax[2]));
-      if (__pyx_t_4) {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":479
- *             if tmax[0] < tmax[1]:
- *                 if tmax[0] < tmax[2]:
- *                     exit_t = fmin(tmax[0], 1.0)             # <<<<<<<<<<<<<<
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)
- */
-        __pyx_v_exit_t = __pyx_f_2yt_9amr_utils_fmin((__pyx_v_tmax[0]), 1.0);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":481
- *                     exit_t = fmin(tmax[0], 1.0)
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)             # <<<<<<<<<<<<<<
- *                     cur_ind[0] += step[0]
- *                     enter_t = tmax[0]
- */
-        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self->__pyx_vtab)->sample_values(__pyx_v_self, __pyx_v_v_pos, __pyx_v_v_dir, __pyx_v_enter_t, __pyx_v_exit_t, __pyx_v_cur_ind, __pyx_v_rgba, __pyx_v_tf);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":482
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)
- *                     cur_ind[0] += step[0]             # <<<<<<<<<<<<<<
- *                     enter_t = tmax[0]
- *                     tmax[0] += tdelta[0]
- */
-        (__pyx_v_cur_ind[0]) += (__pyx_v_step[0]);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":483
- *                                        rgba, tf)
- *                     cur_ind[0] += step[0]
- *                     enter_t = tmax[0]             # <<<<<<<<<<<<<<
- *                     tmax[0] += tdelta[0]
- *                 else:
- */
-        __pyx_v_enter_t = (__pyx_v_tmax[0]);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":484
- *                     cur_ind[0] += step[0]
- *                     enter_t = tmax[0]
- *                     tmax[0] += tdelta[0]             # <<<<<<<<<<<<<<
- *                 else:
- *                     exit_t = fmin(tmax[2], 1.0)
- */
-        (__pyx_v_tmax[0]) += (__pyx_v_tdelta[0]);
-        goto __pyx_L21;
-      }
-      /*else*/ {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":486
- *                     tmax[0] += tdelta[0]
- *                 else:
- *                     exit_t = fmin(tmax[2], 1.0)             # <<<<<<<<<<<<<<
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)
- */
-        __pyx_v_exit_t = __pyx_f_2yt_9amr_utils_fmin((__pyx_v_tmax[2]), 1.0);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":488
- *                     exit_t = fmin(tmax[2], 1.0)
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)             # <<<<<<<<<<<<<<
- *                     cur_ind[2] += step[2]
- *                     enter_t = tmax[2]
- */
-        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self->__pyx_vtab)->sample_values(__pyx_v_self, __pyx_v_v_pos, __pyx_v_v_dir, __pyx_v_enter_t, __pyx_v_exit_t, __pyx_v_cur_ind, __pyx_v_rgba, __pyx_v_tf);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":489
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)
- *                     cur_ind[2] += step[2]             # <<<<<<<<<<<<<<
- *                     enter_t = tmax[2]
- *                     tmax[2] += tdelta[2]
- */
-        (__pyx_v_cur_ind[2]) += (__pyx_v_step[2]);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":490
- *                                        rgba, tf)
- *                     cur_ind[2] += step[2]
- *                     enter_t = tmax[2]             # <<<<<<<<<<<<<<
- *                     tmax[2] += tdelta[2]
- *             else:
- */
-        __pyx_v_enter_t = (__pyx_v_tmax[2]);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":491
- *                     cur_ind[2] += step[2]
- *                     enter_t = tmax[2]
- *                     tmax[2] += tdelta[2]             # <<<<<<<<<<<<<<
- *             else:
- *                 if tmax[1] < tmax[2]:
- */
-        (__pyx_v_tmax[2]) += (__pyx_v_tdelta[2]);
-      }
-      __pyx_L21:;
-      goto __pyx_L20;
-    }
-    /*else*/ {
-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":493
- *                     tmax[2] += tdelta[2]
- *             else:
- *                 if tmax[1] < tmax[2]:             # <<<<<<<<<<<<<<
- *                     exit_t = fmin(tmax[1], 1.0)
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- */
-      __pyx_t_4 = ((__pyx_v_tmax[1]) < (__pyx_v_tmax[2]));
-      if (__pyx_t_4) {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":494
- *             else:
- *                 if tmax[1] < tmax[2]:
- *                     exit_t = fmin(tmax[1], 1.0)             # <<<<<<<<<<<<<<
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)
- */
-        __pyx_v_exit_t = __pyx_f_2yt_9amr_utils_fmin((__pyx_v_tmax[1]), 1.0);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":496
- *                     exit_t = fmin(tmax[1], 1.0)
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)             # <<<<<<<<<<<<<<
- *                     cur_ind[1] += step[1]
- *                     enter_t = tmax[1]
- */
-        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self->__pyx_vtab)->sample_values(__pyx_v_self, __pyx_v_v_pos, __pyx_v_v_dir, __pyx_v_enter_t, __pyx_v_exit_t, __pyx_v_cur_ind, __pyx_v_rgba, __pyx_v_tf);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":497
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)
- *                     cur_ind[1] += step[1]             # <<<<<<<<<<<<<<
- *                     enter_t = tmax[1]
- *                     tmax[1] += tdelta[1]
- */
-        (__pyx_v_cur_ind[1]) += (__pyx_v_step[1]);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":498
- *                                        rgba, tf)
- *                     cur_ind[1] += step[1]
- *                     enter_t = tmax[1]             # <<<<<<<<<<<<<<
- *                     tmax[1] += tdelta[1]
- *                 else:
- */
-        __pyx_v_enter_t = (__pyx_v_tmax[1]);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":499
- *                     cur_ind[1] += step[1]
- *                     enter_t = tmax[1]
- *                     tmax[1] += tdelta[1]             # <<<<<<<<<<<<<<
- *                 else:
- *                     exit_t = fmin(tmax[2], 1.0)
- */
-        (__pyx_v_tmax[1]) += (__pyx_v_tdelta[1]);
-        goto __pyx_L22;
-      }
-      /*else*/ {
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":501
- *                     tmax[1] += tdelta[1]
- *                 else:
- *                     exit_t = fmin(tmax[2], 1.0)             # <<<<<<<<<<<<<<
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)
- */
-        __pyx_v_exit_t = __pyx_f_2yt_9amr_utils_fmin((__pyx_v_tmax[2]), 1.0);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":503
- *                     exit_t = fmin(tmax[2], 1.0)
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)             # <<<<<<<<<<<<<<
- *                     cur_ind[2] += step[2]
- *                     enter_t = tmax[2]
- */
-        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self->__pyx_vtab)->sample_values(__pyx_v_self, __pyx_v_v_pos, __pyx_v_v_dir, __pyx_v_enter_t, __pyx_v_exit_t, __pyx_v_cur_ind, __pyx_v_rgba, __pyx_v_tf);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":504
- *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
- *                                        rgba, tf)
- *                     cur_ind[2] += step[2]             # <<<<<<<<<<<<<<
- *                     enter_t = tmax[2]
- *                     tmax[2] += tdelta[2]
- */
-        (__pyx_v_cur_ind[2]) += (__pyx_v_step[2]);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":505
- *                                        rgba, tf)
- *                     cur_ind[2] += step[2]
- *                     enter_t = tmax[2]             # <<<<<<<<<<<<<<
- *                     tmax[2] += tdelta[2]
- *             if enter_t > 1.0: break
- */
-        __pyx_v_enter_t = (__pyx_v_tmax[2]);
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":506
- *                     cur_ind[2] += step[2]
- *                     enter_t = tmax[2]
- *                     tmax[2] += tdelta[2]             # <<<<<<<<<<<<<<
- *             if enter_t > 1.0: break
- *         return hit
- */
-        (__pyx_v_tmax[2]) += (__pyx_v_tdelta[2]);
-      }
-      __pyx_L22:;
-    }
-    __pyx_L20:;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":507
- *                     enter_t = tmax[2]
- *                     tmax[2] += tdelta[2]
- *             if enter_t > 1.0: break             # <<<<<<<<<<<<<<
- *         return hit
- * 
- */
-    __pyx_t_4 = (__pyx_v_enter_t > 1.0);
-    if (__pyx_t_4) {
-      goto __pyx_L18_break;
-      goto __pyx_L23;
-    }
-    __pyx_L23:;
-  }
-  __pyx_L18_break:;
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":508
- *                     tmax[2] += tdelta[2]
- *             if enter_t > 1.0: break
- *         return hit             # <<<<<<<<<<<<<<
- * 
- *     @cython.boundscheck(False)
- */
-  __pyx_r = __pyx_v_hit;
-  goto __pyx_L0;
-
-  __pyx_r = 0;
-  goto __pyx_L0;
-  __pyx_L1_error:;
-  __Pyx_WriteUnraisable("yt.amr_utils.PartitionedGrid.integrate_ray");
-  __pyx_r = 0;
-  __pyx_L0:;
-  __Pyx_RefNannyFinishContext();
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-/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":512
- *     @cython.boundscheck(False)
- *     @cython.wraparound(False)
- *     cdef void sample_values(self,             # <<<<<<<<<<<<<<
- *                             np.float64_t v_pos[3],
- *                             np.float64_t v_dir[3],
- */
-
-static  void __pyx_f_2yt_9amr_utils_15PartitionedGrid_sample_values(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *__pyx_v_self, __pyx_t_5numpy_float64_t *__pyx_v_v_pos, __pyx_t_5numpy_float64_t *__pyx_v_v_dir, __pyx_t_5numpy_float64_t __pyx_v_enter_t, __pyx_t_5numpy_float64_t __pyx_v_exit_t, int *__pyx_v_ci, __pyx_t_5numpy_float64_t *__pyx_v_rgba, struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *__pyx_v_tf) {
-  __pyx_t_5numpy_float64_t __pyx_v_dp[3];
-  __pyx_t_5numpy_float64_t __pyx_v_temp;
-  __pyx_t_5numpy_float64_t __pyx_v_dt;
-  __pyx_t_5numpy_float64_t __pyx_v_grad[3];
-  __pyx_t_5numpy_float64_t __pyx_v_ds[3];
-  int __pyx_v_dti;
-  int __pyx_v_i;
-  int __pyx_v_offset;
-  __pyx_t_5numpy_float64_t __pyx_t_1;
-  int __pyx_t_2;
-  int __pyx_t_3;
-  int __pyx_t_4;
-  int __pyx_t_5;
-  __Pyx_RefNannySetupContext("sample_values");
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":522
- *         cdef np.float64_t cp[3], dp[3], temp, dt, t, dv
- *         cdef np.float64_t grad[3], ds[3]
- *         grad[0] = grad[1] = grad[2] = 0.0             # <<<<<<<<<<<<<<
- *         cdef int dti, i
- *         dt = (exit_t - enter_t) / tf.ns # 4 samples should be dt=0.25
- */
-  (__pyx_v_grad[0]) = 0.0;
-  (__pyx_v_grad[1]) = 0.0;
-  (__pyx_v_grad[2]) = 0.0;
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":524
- *         grad[0] = grad[1] = grad[2] = 0.0
- *         cdef int dti, i
- *         dt = (exit_t - enter_t) / tf.ns # 4 samples should be dt=0.25             # <<<<<<<<<<<<<<
- *         cdef int offset = ci[0] * (self.dims[1] + 1) * (self.dims[2] + 1) \
- *                         + ci[1] * (self.dims[2] + 1) + ci[2]
- */
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-    {__pyx_filename = __pyx_f[2]; __pyx_lineno = 524; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  }
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-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":526
- *         dt = (exit_t - enter_t) / tf.ns # 4 samples should be dt=0.25
- *         cdef int offset = ci[0] * (self.dims[1] + 1) * (self.dims[2] + 1) \
- *                         + ci[1] * (self.dims[2] + 1) + ci[2]             # <<<<<<<<<<<<<<
- *         for i in range(3):
- *             # temp is the left edge of the current cell
- */
-  __pyx_v_offset = (((((__pyx_v_ci[0]) * ((__pyx_v_self->dims[1]) + 1)) * ((__pyx_v_self->dims[2]) + 1)) + ((__pyx_v_ci[1]) * ((__pyx_v_self->dims[2]) + 1))) + (__pyx_v_ci[2]));
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":527
- *         cdef int offset = ci[0] * (self.dims[1] + 1) * (self.dims[2] + 1) \
- *                         + ci[1] * (self.dims[2] + 1) + ci[2]
- *         for i in range(3):             # <<<<<<<<<<<<<<
- *             # temp is the left edge of the current cell
- *             temp = ci[i] * self.dds[i] + self.left_edge[i]
- */
-  for (__pyx_t_2 = 0; __pyx_t_2 < 3; __pyx_t_2+=1) {
-    __pyx_v_i = __pyx_t_2;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":529
- *         for i in range(3):
- *             # temp is the left edge of the current cell
- *             temp = ci[i] * self.dds[i] + self.left_edge[i]             # <<<<<<<<<<<<<<
- *             # this gets us dp as the current first sample position
- *             dp[i] = (enter_t + 0.5 * dt) * v_dir[i] + v_pos[i] - temp
- */
-    __pyx_v_temp = (((__pyx_v_ci[__pyx_v_i]) * (__pyx_v_self->dds[__pyx_v_i])) + (__pyx_v_self->left_edge[__pyx_v_i]));
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":531
- *             temp = ci[i] * self.dds[i] + self.left_edge[i]
- *             # this gets us dp as the current first sample position
- *             dp[i] = (enter_t + 0.5 * dt) * v_dir[i] + v_pos[i] - temp             # <<<<<<<<<<<<<<
- *             dp[i] *= self.idds[i]
- *             ds[i] = v_dir[i] * self.idds[i] * dt
- */
-    (__pyx_v_dp[__pyx_v_i]) = ((((__pyx_v_enter_t + (0.5 * __pyx_v_dt)) * (__pyx_v_v_dir[__pyx_v_i])) + (__pyx_v_v_pos[__pyx_v_i])) - __pyx_v_temp);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":532
- *             # this gets us dp as the current first sample position
- *             dp[i] = (enter_t + 0.5 * dt) * v_dir[i] + v_pos[i] - temp
- *             dp[i] *= self.idds[i]             # <<<<<<<<<<<<<<
- *             ds[i] = v_dir[i] * self.idds[i] * dt
- *         for dti in range(tf.ns):
- */
-    (__pyx_v_dp[__pyx_v_i]) *= (__pyx_v_self->idds[__pyx_v_i]);
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":533
- *             dp[i] = (enter_t + 0.5 * dt) * v_dir[i] + v_pos[i] - temp
- *             dp[i] *= self.idds[i]
- *             ds[i] = v_dir[i] * self.idds[i] * dt             # <<<<<<<<<<<<<<
- *         for dti in range(tf.ns):
- *             for i in range(self.n_fields):
- */
-    (__pyx_v_ds[__pyx_v_i]) = (((__pyx_v_v_dir[__pyx_v_i]) * (__pyx_v_self->idds[__pyx_v_i])) * __pyx_v_dt);
-  }
-
-  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":534
- *             dp[i] *= self.idds[i]
- *             ds[i] = v_dir[i] * self.idds[i] * dt
- *         for dti in range(tf.ns):             # <<<<<<<<<<<<<<
- *             for i in range(self.n_fields):
- *                 self.dvs[i] = offset_interpolate(self.dims, dp, self.data[i] + offset)
- */
-  __pyx_t_2 = __pyx_v_tf->ns;
-  for (__pyx_t_3 = 0; __pyx_t_3 < __pyx_t_2; __pyx_t_3+=1) {
-    __pyx_v_dti = __pyx_t_3;
-
-    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":535
- *             ds[i] = v_dir[i] * self.idds[i] * dt
- *         for dti in range(tf.ns):
- *             for i in range(self.n_fields):             # <<<<<<<<<<<<<<
- *                 self.dvs[i] = offset_interpolate(self.dims, dp, self.data[i] + offset)
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-          __pyx_t_9 = __pyx_t_7;
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-          goto __pyx_L9_continue;
-          goto __pyx_L11;
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-
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- */
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-          __pyx_t_7 = (__pyx_v_oj == 1);
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-          __pyx_t_8 = __pyx_t_9;
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-          goto __pyx_L9_continue;
-          goto __pyx_L12;
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-        __pyx_L12:;
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":58
- *                 if i == 0 and oi == -1: continue
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- *                 for offset_j in range(3):             # <<<<<<<<<<<<<<
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- */
-        for (__pyx_t_10 = 0; __pyx_t_10 < 3; __pyx_t_10+=1) {
-          __pyx_v_offset_j = __pyx_t_10;
-
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- *                 for offset_j in range(3):
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- *                     if j == nz - 1 and oj == 1: continue
- */
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-
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- */
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-            goto __pyx_L13_continue;
-            goto __pyx_L15;
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-
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- *                     if j == nz - 1 and oj == 1: continue             # <<<<<<<<<<<<<<
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- *                     if j == nz - 1 and oj == 1: continue
- *                     c1 = contour_ids[0, i, j]             # <<<<<<<<<<<<<<
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- *                     if c1 > -1 and c2 > -1:
- */
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-          __pyx_t_13 = __pyx_v_j;
-          if (__pyx_t_11 < 0) __pyx_t_11 += __pyx_bshape_0_contour_ids;
-          if (__pyx_t_12 < 0) __pyx_t_12 += __pyx_bshape_1_contour_ids;
-          if (__pyx_t_13 < 0) __pyx_t_13 += __pyx_bshape_2_contour_ids;
-          __pyx_v_c1 = (*__Pyx_BufPtrStrided3d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_contour_ids.buf, __pyx_t_11, __pyx_bstride_0_contour_ids, __pyx_t_12, __pyx_bstride_1_contour_ids, __pyx_t_13, __pyx_bstride_2_contour_ids));
-
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- */
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-          __pyx_t_16 = (__pyx_v_j + __pyx_v_oj);
-          if (__pyx_t_14 < 0) __pyx_t_14 += __pyx_bshape_0_contour_ids;
-          if (__pyx_t_15 < 0) __pyx_t_15 += __pyx_bshape_1_contour_ids;
-          if (__pyx_t_16 < 0) __pyx_t_16 += __pyx_bshape_2_contour_ids;
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-
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-              PyErr_SetString(PyExc_AttributeError, "'NoneType' object has no attribute 'append'"); {__pyx_filename = __pyx_f[6]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;} 
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-            __pyx_t_17 = 0;
-            __pyx_t_19 = PyList_Append(((PyObject *)__pyx_v_tree), __pyx_t_18); if (unlikely(__pyx_t_19 == -1)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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- *                     c1 = contour_ids[nx-1, i, j]             # <<<<<<<<<<<<<<
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- */
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-          __pyx_t_21 = __pyx_v_j;
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-          if (__pyx_t_19 < 0) __pyx_t_19 += __pyx_bshape_1_contour_ids;
-          if (__pyx_t_21 < 0) __pyx_t_21 += __pyx_bshape_2_contour_ids;
-          __pyx_v_c1 = (*__Pyx_BufPtrStrided3d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_contour_ids.buf, __pyx_t_20, __pyx_bstride_0_contour_ids, __pyx_t_19, __pyx_bstride_1_contour_ids, __pyx_t_21, __pyx_bstride_2_contour_ids));
-
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-          __pyx_t_24 = (__pyx_v_j + __pyx_v_oj);
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-          if (__pyx_t_24 < 0) __pyx_t_24 += __pyx_bshape_2_contour_ids;
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-            __pyx_t_18 = __Pyx_PyInt_to_py_npy_int64(__pyx_f_2yt_9amr_utils_i64max(__pyx_v_c1, __pyx_v_c2)); if (unlikely(!__pyx_t_18)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 69; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-            __pyx_t_1 = PyTuple_New(2); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 69; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-            __Pyx_GOTREF(__pyx_t_1);
-            PyTuple_SET_ITEM(__pyx_t_1, 0, __pyx_t_18);
-            __Pyx_GIVEREF(__pyx_t_18);
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-            __Pyx_GIVEREF(__pyx_t_17);
-            __pyx_t_18 = 0;
-            __pyx_t_17 = 0;
-            __pyx_t_25 = PyList_Append(((PyObject *)__pyx_v_tree), __pyx_t_1); if (unlikely(__pyx_t_25 == -1)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 69; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-            __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
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-          __pyx_L18:;
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- *                         tree.append((i64max(c1,c2), i64min(c1,c2)))
- *     # Now y-pass
- *     for i in range(nx):             # <<<<<<<<<<<<<<
- *         for j in range(nz):
- *             for offset_i in range(3):
- */
-  __pyx_t_2 = __pyx_v_nx;
-  for (__pyx_t_3 = 0; __pyx_t_3 < __pyx_t_2; __pyx_t_3+=1) {
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-
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- *     # Now y-pass
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- *         for j in range(nz):             # <<<<<<<<<<<<<<
- *             for offset_i in range(3):
- *                 oi = offset_i - 1
- */
-    __pyx_t_4 = __pyx_v_nz;
-    for (__pyx_t_5 = 0; __pyx_t_5 < __pyx_t_4; __pyx_t_5+=1) {
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-
-      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":73
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- *         for j in range(nz):
- *             for offset_i in range(3):             # <<<<<<<<<<<<<<
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- */
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-
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- *                 oi = offset_i - 1             # <<<<<<<<<<<<<<
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- */
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- *                 oi = offset_i - 1
- *                 if i == 0 and oi == -1: continue             # <<<<<<<<<<<<<<
- *                 if i == nx - 1 and oj == 1: continue
- *                 for offset_j in range(3):
- */
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-          __pyx_t_8 = (__pyx_v_oi == -1);
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-          goto __pyx_L23_continue;
-          goto __pyx_L25;
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-        __pyx_L25:;
-
-        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":76
- *                 oi = offset_i - 1
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- *                 if i == nx - 1 and oj == 1: continue             # <<<<<<<<<<<<<<
- *                 for offset_j in range(3):
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- */
-        __pyx_t_9 = (__pyx_v_i == (__pyx_v_nx - 1));
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-          goto __pyx_L23_continue;
-          goto __pyx_L26;
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-        __pyx_L26:;
-
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- *                 if i == 0 and oi == -1: continue
- *                 if i == nx - 1 and oj == 1: continue
- *                 for offset_j in range(3):             # <<<<<<<<<<<<<<
- *                     oj = offset_j - 1
- *                     if j == 0 and oj == -1: continue
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-
-          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":78
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- *                 for offset_j in range(3):
- *                     oj = offset_j - 1             # <<<<<<<<<<<<<<
- *                     if j == 0 and oj == -1: continue
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- */
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-
-          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":79
- *                 for offset_j in range(3):
- *                     oj = offset_j - 1
- *                     if j == 0 and oj == -1: continue             # <<<<<<<<<<<<<<
- *                     if j == nz - 1 and oj == 1: continue
- *                     c1 = contour_ids[i, 0, j]
- */
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-            __pyx_t_7 = __pyx_t_8;
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-            goto __pyx_L27_continue;
-            goto __pyx_L29;
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-          __pyx_L29:;
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- *                     if c1 > -1 and c2 > -1:             # <<<<<<<<<<<<<<
- *                         tree.append((i64max(c1,c2), i64min(c1,c2)))
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- */
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-
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- *                     c2 = contour_ids[i + oi, j + oj, 1]
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-  {0, 0, 0, 0}
-};
-
-static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_OctreeGrid[] = {
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-  {(char *)"fields", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_fields, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_fields, 0, 0},
-  {(char *)"left_edges", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_left_edges, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_left_edges, 0, 0},
-  {(char *)"dimensions", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_dimensions, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_dimensions, 0, 0},
-  {(char *)"dx", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_dx, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_dx, 0, 0},
-  {(char *)"level", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_level, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_level, 0, 0},
-  {0, 0, 0, 0, 0}
-};
-
-static PyNumberMethods __pyx_tp_as_number_OctreeGrid = {
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-  0, /*nb_subtract*/
-  0, /*nb_multiply*/
-  #if PY_MAJOR_VERSION < 3
-  0, /*nb_divide*/
-  #endif
-  0, /*nb_remainder*/
-  0, /*nb_divmod*/
-  0, /*nb_power*/
-  0, /*nb_negative*/
-  0, /*nb_positive*/
-  0, /*nb_absolute*/
-  0, /*nb_nonzero*/
-  0, /*nb_invert*/
-  0, /*nb_lshift*/
-  0, /*nb_rshift*/
-  0, /*nb_and*/
-  0, /*nb_xor*/
-  0, /*nb_or*/
-  #if PY_MAJOR_VERSION < 3
-  0, /*nb_coerce*/
-  #endif
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-  #if PY_MAJOR_VERSION >= 3
-  0, /*reserved*/
-  #else
-  0, /*nb_long*/
-  #endif
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-  #if PY_MAJOR_VERSION < 3
-  0, /*nb_oct*/
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-  0, /*nb_inplace_subtract*/
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-  #if PY_MAJOR_VERSION < 3
-  0, /*nb_inplace_divide*/
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-  0, /*nb_inplace_remainder*/
-  0, /*nb_inplace_power*/
-  0, /*nb_inplace_lshift*/
-  0, /*nb_inplace_rshift*/
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-  0, /*nb_inplace_xor*/
-  0, /*nb_inplace_or*/
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-  0, /*nb_true_divide*/
-  0, /*nb_inplace_floor_divide*/
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-  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
-  0, /*nb_index*/
-  #endif
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-
-static PySequenceMethods __pyx_tp_as_sequence_OctreeGrid = {
-  0, /*sq_length*/
-  0, /*sq_concat*/
-  0, /*sq_repeat*/
-  0, /*sq_item*/
-  0, /*sq_slice*/
-  0, /*sq_ass_item*/
-  0, /*sq_ass_slice*/
-  0, /*sq_contains*/
-  0, /*sq_inplace_concat*/
-  0, /*sq_inplace_repeat*/
-};
-
-static PyMappingMethods __pyx_tp_as_mapping_OctreeGrid = {
-  0, /*mp_length*/
-  0, /*mp_subscript*/
-  0, /*mp_ass_subscript*/
-};
-
-static PyBufferProcs __pyx_tp_as_buffer_OctreeGrid = {
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getreadbuffer*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getwritebuffer*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getsegcount*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getcharbuffer*/
-  #endif
-  #if PY_VERSION_HEX >= 0x02060000
-  0, /*bf_getbuffer*/
-  #endif
-  #if PY_VERSION_HEX >= 0x02060000
-  0, /*bf_releasebuffer*/
-  #endif
-};
-
-PyTypeObject __pyx_type_2yt_9amr_utils_OctreeGrid = {
-  PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("yt.amr_utils.OctreeGrid"), /*tp_name*/
-  sizeof(struct __pyx_obj_2yt_9amr_utils_OctreeGrid), /*tp_basicsize*/
-  0, /*tp_itemsize*/
-  __pyx_tp_dealloc_2yt_9amr_utils_OctreeGrid, /*tp_dealloc*/
-  0, /*tp_print*/
-  0, /*tp_getattr*/
-  0, /*tp_setattr*/
-  #if PY_MAJOR_VERSION >= 3
-  0, /*reserved*/
-  #else
-  0, /*tp_compare*/
-  #endif
-  0, /*tp_repr*/
-  &__pyx_tp_as_number_OctreeGrid, /*tp_as_number*/
-  &__pyx_tp_as_sequence_OctreeGrid, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping_OctreeGrid, /*tp_as_mapping*/
-  0, /*tp_hash*/
-  0, /*tp_call*/
-  0, /*tp_str*/
-  0, /*tp_getattro*/
-  0, /*tp_setattro*/
-  &__pyx_tp_as_buffer_OctreeGrid, /*tp_as_buffer*/
-  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
-  0, /*tp_doc*/
-  __pyx_tp_traverse_2yt_9amr_utils_OctreeGrid, /*tp_traverse*/
-  __pyx_tp_clear_2yt_9amr_utils_OctreeGrid, /*tp_clear*/
-  0, /*tp_richcompare*/
-  0, /*tp_weaklistoffset*/
-  0, /*tp_iter*/
-  0, /*tp_iternext*/
-  __pyx_methods_2yt_9amr_utils_OctreeGrid, /*tp_methods*/
-  0, /*tp_members*/
-  __pyx_getsets_2yt_9amr_utils_OctreeGrid, /*tp_getset*/
-  0, /*tp_base*/
-  0, /*tp_dict*/
-  0, /*tp_descr_get*/
-  0, /*tp_descr_set*/
-  0, /*tp_dictoffset*/
-  0, /*tp_init*/
-  0, /*tp_alloc*/
-  __pyx_tp_new_2yt_9amr_utils_OctreeGrid, /*tp_new*/
-  0, /*tp_free*/
-  0, /*tp_is_gc*/
-  0, /*tp_bases*/
-  0, /*tp_mro*/
-  0, /*tp_cache*/
-  0, /*tp_subclasses*/
-  0, /*tp_weaklist*/
-  0, /*tp_del*/
-  #if PY_VERSION_HEX >= 0x02060000
-  0, /*tp_version_tag*/
-  #endif
-};
-
-static PyObject *__pyx_tp_new_2yt_9amr_utils_OctreeGridList(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_2yt_9amr_utils_OctreeGridList *p;
-  PyObject *o = (*t->tp_alloc)(t, 0);
-  if (!o) return 0;
-  p = ((struct __pyx_obj_2yt_9amr_utils_OctreeGridList *)o);
-  p->grids = Py_None; Py_INCREF(Py_None);
-  if (__pyx_pf_2yt_9amr_utils_14OctreeGridList___cinit__(o, a, k) < 0) {
-    Py_DECREF(o); o = 0;
-  }
-  return o;
-}
-
-static void __pyx_tp_dealloc_2yt_9amr_utils_OctreeGridList(PyObject *o) {
-  struct __pyx_obj_2yt_9amr_utils_OctreeGridList *p = (struct __pyx_obj_2yt_9amr_utils_OctreeGridList *)o;
-  Py_XDECREF(p->grids);
-  (*Py_TYPE(o)->tp_free)(o);
-}
-
-static int __pyx_tp_traverse_2yt_9amr_utils_OctreeGridList(PyObject *o, visitproc v, void *a) {
-  int e;
-  struct __pyx_obj_2yt_9amr_utils_OctreeGridList *p = (struct __pyx_obj_2yt_9amr_utils_OctreeGridList *)o;
-  if (p->grids) {
-    e = (*v)(p->grids, a); if (e) return e;
-  }
-  return 0;
-}
-
-static int __pyx_tp_clear_2yt_9amr_utils_OctreeGridList(PyObject *o) {
-  struct __pyx_obj_2yt_9amr_utils_OctreeGridList *p = (struct __pyx_obj_2yt_9amr_utils_OctreeGridList *)o;
-  PyObject* tmp;
-  tmp = ((PyObject*)p->grids);
-  p->grids = Py_None; Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
-  return 0;
-}
-static PyObject *__pyx_sq_item_2yt_9amr_utils_OctreeGridList(PyObject *o, Py_ssize_t i) {
-  PyObject *r;
-  PyObject *x = PyInt_FromSsize_t(i); if(!x) return 0;
-  r = Py_TYPE(o)->tp_as_mapping->mp_subscript(o, x);
-  Py_DECREF(x);
-  return r;
-}
-
-static PyObject *__pyx_getprop_2yt_9amr_utils_14OctreeGridList_grids(PyObject *o, void *x) {
-  return __pyx_pf_2yt_9amr_utils_14OctreeGridList_5grids___get__(o);
-}
-
-static int __pyx_setprop_2yt_9amr_utils_14OctreeGridList_grids(PyObject *o, PyObject *v, void *x) {
-  if (v) {
-    return __pyx_pf_2yt_9amr_utils_14OctreeGridList_5grids___set__(o, v);
-  }
-  else {
-    return __pyx_pf_2yt_9amr_utils_14OctreeGridList_5grids___del__(o);
-  }
-}
-
-static PyMethodDef __pyx_methods_2yt_9amr_utils_OctreeGridList[] = {
-  {__Pyx_NAMESTR("__getitem__"), (PyCFunction)__pyx_pf_2yt_9amr_utils_14OctreeGridList___getitem__, METH_O|METH_COEXIST, __Pyx_DOCSTR(0)},
-  {0, 0, 0, 0}
-};
-
-static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_OctreeGridList[] = {
-  {(char *)"grids", __pyx_getprop_2yt_9amr_utils_14OctreeGridList_grids, __pyx_setprop_2yt_9amr_utils_14OctreeGridList_grids, 0, 0},
-  {0, 0, 0, 0, 0}
-};
-
-static PyNumberMethods __pyx_tp_as_number_OctreeGridList = {
-  0, /*nb_add*/
-  0, /*nb_subtract*/
-  0, /*nb_multiply*/
-  #if PY_MAJOR_VERSION < 3
-  0, /*nb_divide*/
-  #endif
-  0, /*nb_remainder*/
-  0, /*nb_divmod*/
-  0, /*nb_power*/
-  0, /*nb_negative*/
-  0, /*nb_positive*/
-  0, /*nb_absolute*/
-  0, /*nb_nonzero*/
-  0, /*nb_invert*/
-  0, /*nb_lshift*/
-  0, /*nb_rshift*/
-  0, /*nb_and*/
-  0, /*nb_xor*/
-  0, /*nb_or*/
-  #if PY_MAJOR_VERSION < 3
-  0, /*nb_coerce*/
-  #endif
-  0, /*nb_int*/
-  #if PY_MAJOR_VERSION >= 3
-  0, /*reserved*/
-  #else
-  0, /*nb_long*/
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-  0, /*nb_float*/
-  #if PY_MAJOR_VERSION < 3
-  0, /*nb_oct*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*nb_hex*/
-  #endif
-  0, /*nb_inplace_add*/
-  0, /*nb_inplace_subtract*/
-  0, /*nb_inplace_multiply*/
-  #if PY_MAJOR_VERSION < 3
-  0, /*nb_inplace_divide*/
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-  0, /*nb_inplace_remainder*/
-  0, /*nb_inplace_power*/
-  0, /*nb_inplace_lshift*/
-  0, /*nb_inplace_rshift*/
-  0, /*nb_inplace_and*/
-  0, /*nb_inplace_xor*/
-  0, /*nb_inplace_or*/
-  0, /*nb_floor_divide*/
-  0, /*nb_true_divide*/
-  0, /*nb_inplace_floor_divide*/
-  0, /*nb_inplace_true_divide*/
-  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
-  0, /*nb_index*/
-  #endif
-};
-
-static PySequenceMethods __pyx_tp_as_sequence_OctreeGridList = {
-  0, /*sq_length*/
-  0, /*sq_concat*/
-  0, /*sq_repeat*/
-  __pyx_sq_item_2yt_9amr_utils_OctreeGridList, /*sq_item*/
-  0, /*sq_slice*/
-  0, /*sq_ass_item*/
-  0, /*sq_ass_slice*/
-  0, /*sq_contains*/
-  0, /*sq_inplace_concat*/
-  0, /*sq_inplace_repeat*/
-};
-
-static PyMappingMethods __pyx_tp_as_mapping_OctreeGridList = {
-  0, /*mp_length*/
-  __pyx_pf_2yt_9amr_utils_14OctreeGridList___getitem__, /*mp_subscript*/
-  0, /*mp_ass_subscript*/
-};
-
-static PyBufferProcs __pyx_tp_as_buffer_OctreeGridList = {
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getreadbuffer*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getwritebuffer*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getsegcount*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getcharbuffer*/
-  #endif
-  #if PY_VERSION_HEX >= 0x02060000
-  0, /*bf_getbuffer*/
-  #endif
-  #if PY_VERSION_HEX >= 0x02060000
-  0, /*bf_releasebuffer*/
-  #endif
-};
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-PyTypeObject __pyx_type_2yt_9amr_utils_OctreeGridList = {
-  PyVarObject_HEAD_INIT(0, 0)
-  __Pyx_NAMESTR("yt.amr_utils.OctreeGridList"), /*tp_name*/
-  sizeof(struct __pyx_obj_2yt_9amr_utils_OctreeGridList), /*tp_basicsize*/
-  0, /*tp_itemsize*/
-  __pyx_tp_dealloc_2yt_9amr_utils_OctreeGridList, /*tp_dealloc*/
-  0, /*tp_print*/
-  0, /*tp_getattr*/
-  0, /*tp_setattr*/
-  #if PY_MAJOR_VERSION >= 3
-  0, /*reserved*/
-  #else
-  0, /*tp_compare*/
-  #endif
-  0, /*tp_repr*/
-  &__pyx_tp_as_number_OctreeGridList, /*tp_as_number*/
-  &__pyx_tp_as_sequence_OctreeGridList, /*tp_as_sequence*/
-  &__pyx_tp_as_mapping_OctreeGridList, /*tp_as_mapping*/
-  0, /*tp_hash*/
-  0, /*tp_call*/
-  0, /*tp_str*/
-  0, /*tp_getattro*/
-  0, /*tp_setattro*/
-  &__pyx_tp_as_buffer_OctreeGridList, /*tp_as_buffer*/
-  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
-  0, /*tp_doc*/
-  __pyx_tp_traverse_2yt_9amr_utils_OctreeGridList, /*tp_traverse*/
-  __pyx_tp_clear_2yt_9amr_utils_OctreeGridList, /*tp_clear*/
-  0, /*tp_richcompare*/
-  0, /*tp_weaklistoffset*/
-  0, /*tp_iter*/
-  0, /*tp_iternext*/
-  __pyx_methods_2yt_9amr_utils_OctreeGridList, /*tp_methods*/
-  0, /*tp_members*/
-  __pyx_getsets_2yt_9amr_utils_OctreeGridList, /*tp_getset*/
-  0, /*tp_base*/
-  0, /*tp_dict*/
-  0, /*tp_descr_get*/
-  0, /*tp_descr_set*/
-  0, /*tp_dictoffset*/
-  0, /*tp_init*/
-  0, /*tp_alloc*/
-  __pyx_tp_new_2yt_9amr_utils_OctreeGridList, /*tp_new*/
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-  0, /*tp_is_gc*/
-  0, /*tp_bases*/
-  0, /*tp_mro*/
-  0, /*tp_cache*/
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-  0, /*tp_del*/
-  #if PY_VERSION_HEX >= 0x02060000
-  0, /*tp_version_tag*/
-  #endif
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-static struct __pyx_vtabstruct_2yt_9amr_utils_VectorPlane __pyx_vtable_2yt_9amr_utils_VectorPlane;
-
-static PyObject *__pyx_tp_new_2yt_9amr_utils_VectorPlane(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_2yt_9amr_utils_VectorPlane *p;
-  PyObject *o = (*t->tp_alloc)(t, 0);
-  if (!o) return 0;
-  p = ((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)o);
-  p->__pyx_vtab = __pyx_vtabptr_2yt_9amr_utils_VectorPlane;
-  p->avp_pos = Py_None; Py_INCREF(Py_None);
-  p->avp_dir = Py_None; Py_INCREF(Py_None);
-  p->acenter = Py_None; Py_INCREF(Py_None);
-  p->aimage = Py_None; Py_INCREF(Py_None);
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-  p->ay_vec = Py_None; Py_INCREF(Py_None);
-  if (__pyx_pf_2yt_9amr_utils_11VectorPlane___cinit__(o, a, k) < 0) {
-    Py_DECREF(o); o = 0;
-  }
-  return o;
-}
-
-static void __pyx_tp_dealloc_2yt_9amr_utils_VectorPlane(PyObject *o) {
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-  Py_XDECREF(p->avp_pos);
-  Py_XDECREF(p->avp_dir);
-  Py_XDECREF(p->acenter);
-  Py_XDECREF(p->aimage);
-  Py_XDECREF(p->ax_vec);
-  Py_XDECREF(p->ay_vec);
-  (*Py_TYPE(o)->tp_free)(o);
-}
-
-static int __pyx_tp_traverse_2yt_9amr_utils_VectorPlane(PyObject *o, visitproc v, void *a) {
-  int e;
-  struct __pyx_obj_2yt_9amr_utils_VectorPlane *p = (struct __pyx_obj_2yt_9amr_utils_VectorPlane *)o;
-  if (p->avp_pos) {
-    e = (*v)(p->avp_pos, a); if (e) return e;
-  }
-  if (p->avp_dir) {
-    e = (*v)(p->avp_dir, a); if (e) return e;
-  }
-  if (p->acenter) {
-    e = (*v)(p->acenter, a); if (e) return e;
-  }
-  if (p->aimage) {
-    e = (*v)(p->aimage, a); if (e) return e;
-  }
-  if (p->ax_vec) {
-    e = (*v)(p->ax_vec, a); if (e) return e;
-  }
-  if (p->ay_vec) {
-    e = (*v)(p->ay_vec, a); if (e) return e;
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-  return 0;
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-
-static int __pyx_tp_clear_2yt_9amr_utils_VectorPlane(PyObject *o) {
-  struct __pyx_obj_2yt_9amr_utils_VectorPlane *p = (struct __pyx_obj_2yt_9amr_utils_VectorPlane *)o;
-  PyObject* tmp;
-  tmp = ((PyObject*)p->avp_pos);
-  p->avp_pos = Py_None; Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
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-  p->avp_dir = Py_None; Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
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-  p->acenter = Py_None; Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->aimage);
-  p->aimage = Py_None; Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
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-  Py_XDECREF(tmp);
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-static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_avp_pos(PyObject *o, void *x) {
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-
-static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_avp_pos(PyObject *o, PyObject *v, void *x) {
-  if (v) {
-    return __pyx_pf_2yt_9amr_utils_11VectorPlane_7avp_pos___set__(o, v);
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-static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_avp_dir(PyObject *o, void *x) {
-  return __pyx_pf_2yt_9amr_utils_11VectorPlane_7avp_dir___get__(o);
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-
-static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_avp_dir(PyObject *o, PyObject *v, void *x) {
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-static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_acenter(PyObject *o, void *x) {
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-}
-
-static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_acenter(PyObject *o, PyObject *v, void *x) {
-  if (v) {
-    return __pyx_pf_2yt_9amr_utils_11VectorPlane_7acenter___set__(o, v);
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-
-static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_aimage(PyObject *o, void *x) {
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-static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_aimage(PyObject *o, PyObject *v, void *x) {
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-    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6aimage___set__(o, v);
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-static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_ax_vec(PyObject *o, void *x) {
-  return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ax_vec___get__(o);
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-
-static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_ax_vec(PyObject *o, PyObject *v, void *x) {
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-    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ax_vec___set__(o, v);
-  }
-  else {
-    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ax_vec___del__(o);
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-
-static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_ay_vec(PyObject *o, void *x) {
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-}
-
-static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_ay_vec(PyObject *o, PyObject *v, void *x) {
-  if (v) {
-    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ay_vec___set__(o, v);
-  }
-  else {
-    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ay_vec___del__(o);
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-  {0, 0, 0, 0}
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-
-static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_VectorPlane[] = {
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-  {(char *)"acenter", __pyx_getprop_2yt_9amr_utils_11VectorPlane_acenter, __pyx_setprop_2yt_9amr_utils_11VectorPlane_acenter, 0, 0},
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-  0, /*nb_subtract*/
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-  0, /*nb_inplace_rshift*/
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-  0, /*nb_index*/
-  #endif
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-
-static PySequenceMethods __pyx_tp_as_sequence_VectorPlane = {
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-  0, /*sq_concat*/
-  0, /*sq_repeat*/
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-  0, /*sq_slice*/
-  0, /*sq_ass_item*/
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-  0, /*sq_contains*/
-  0, /*sq_inplace_concat*/
-  0, /*sq_inplace_repeat*/
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-
-static PyMappingMethods __pyx_tp_as_mapping_VectorPlane = {
-  0, /*mp_length*/
-  0, /*mp_subscript*/
-  0, /*mp_ass_subscript*/
-};
-
-static PyBufferProcs __pyx_tp_as_buffer_VectorPlane = {
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-  0, /*bf_getreadbuffer*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getwritebuffer*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getsegcount*/
-  #endif
-  #if PY_MAJOR_VERSION < 3
-  0, /*bf_getcharbuffer*/
-  #endif
-  #if PY_VERSION_HEX >= 0x02060000
-  0, /*bf_getbuffer*/
-  #endif
-  #if PY_VERSION_HEX >= 0x02060000
-  0, /*bf_releasebuffer*/
-  #endif
-};
-
-PyTypeObject __pyx_type_2yt_9amr_utils_VectorPlane = {
-  PyVarObject_HEAD_INIT(0, 0)
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-  sizeof(struct __pyx_obj_2yt_9amr_utils_VectorPlane), /*tp_basicsize*/
-  0, /*tp_itemsize*/
-  __pyx_tp_dealloc_2yt_9amr_utils_VectorPlane, /*tp_dealloc*/
-  0, /*tp_print*/
-  0, /*tp_getattr*/
-  0, /*tp_setattr*/
-  #if PY_MAJOR_VERSION >= 3
-  0, /*reserved*/
-  #else
-  0, /*tp_compare*/
-  #endif
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-  &__pyx_tp_as_number_VectorPlane, /*tp_as_number*/
-  &__pyx_tp_as_sequence_VectorPlane, /*tp_as_sequence*/
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-  0, /*tp_call*/
-  0, /*tp_str*/
-  0, /*tp_getattro*/
-  0, /*tp_setattro*/
-  &__pyx_tp_as_buffer_VectorPlane, /*tp_as_buffer*/
-  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
-  0, /*tp_doc*/
-  __pyx_tp_traverse_2yt_9amr_utils_VectorPlane, /*tp_traverse*/
-  __pyx_tp_clear_2yt_9amr_utils_VectorPlane, /*tp_clear*/
-  0, /*tp_richcompare*/
-  0, /*tp_weaklistoffset*/
-  0, /*tp_iter*/
-  0, /*tp_iternext*/
-  __pyx_methods_2yt_9amr_utils_VectorPlane, /*tp_methods*/
-  0, /*tp_members*/
-  __pyx_getsets_2yt_9amr_utils_VectorPlane, /*tp_getset*/
-  0, /*tp_base*/
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-  0, /*tp_descr_get*/
-  0, /*tp_descr_set*/
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-  0, /*tp_init*/
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-  __pyx_tp_new_2yt_9amr_utils_VectorPlane, /*tp_new*/
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-  0, /*tp_mro*/
-  0, /*tp_cache*/
-  0, /*tp_subclasses*/
-  0, /*tp_weaklist*/
-  0, /*tp_del*/
-  #if PY_VERSION_HEX >= 0x02060000
-  0, /*tp_version_tag*/
-  #endif
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-
-static PyObject *__pyx_tp_new_2yt_9amr_utils_TransferFunctionProxy(PyTypeObject *t, PyObject *a, PyObject *k) {
-  struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *p;
-  PyObject *o = (*t->tp_alloc)(t, 0);
-  if (!o) return 0;
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-  if (__pyx_pf_2yt_9amr_utils_21TransferFunctionProxy___cinit__(o, a, k) < 0) {
-    Py_DECREF(o); o = 0;
-  }
-  return o;
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-
-static void __pyx_tp_dealloc_2yt_9amr_utils_TransferFunctionProxy(PyObject *o) {
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-  Py_XDECREF(p->my_field_tables);
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-
-static int __pyx_tp_traverse_2yt_9amr_utils_TransferFunctionProxy(PyObject *o, visitproc v, void *a) {
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-
-static int __pyx_tp_clear_2yt_9amr_utils_TransferFunctionProxy(PyObject *o) {
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-  Py_XDECREF(tmp);
-  return 0;
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-
-static PyObject *__pyx_getprop_2yt_9amr_utils_21TransferFunctionProxy_ns(PyObject *o, void *x) {
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-
-static int __pyx_setprop_2yt_9amr_utils_21TransferFunctionProxy_ns(PyObject *o, PyObject *v, void *x) {
-  if (v) {
-    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_2ns___set__(o, v);
-  }
-  else {
-    PyErr_SetString(PyExc_NotImplementedError, "__del__");
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-  }
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-
-static PyObject *__pyx_getprop_2yt_9amr_utils_21TransferFunctionProxy_tf_obj(PyObject *o, void *x) {
-  return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_6tf_obj___get__(o);
-}
-
-static int __pyx_setprop_2yt_9amr_utils_21TransferFunctionProxy_tf_obj(PyObject *o, PyObject *v, void *x) {
-  if (v) {
-    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_6tf_obj___set__(o, v);
-  }
-  else {
-    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_6tf_obj___del__(o);
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-
-static PyObject *__pyx_getprop_2yt_9amr_utils_21TransferFunctionProxy_my_field_tables(PyObject *o, void *x) {
-  return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_15my_field_tables___get__(o);
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-
-static int __pyx_setprop_2yt_9amr_utils_21TransferFunctionProxy_my_field_tables(PyObject *o, PyObject *v, void *x) {
-  if (v) {
-    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_15my_field_tables___set__(o, v);
-  }
-  else {
-    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_15my_field_tables___del__(o);
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-
-static PyMethodDef __pyx_methods_2yt_9amr_utils_TransferFunctionProxy[] = {
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-
-static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_TransferFunctionProxy[] = {
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-    Py_DECREF(o); o = 0;
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-  return o;
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-
-static void __pyx_tp_dealloc_2yt_9amr_utils_PartitionedGrid(PyObject *o) {
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-  Py_XDECREF(p->RightEdge);
-  (*Py_TYPE(o)->tp_free)(o);
-}
-
-static int __pyx_tp_traverse_2yt_9amr_utils_PartitionedGrid(PyObject *o, visitproc v, void *a) {
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-  struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *p = (struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)o;
-  if (p->my_data) {
-    e = (*v)(p->my_data, a); if (e) return e;
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-  if (p->LeftEdge) {
-    e = (*v)(p->LeftEdge, a); if (e) return e;
-  }
-  if (p->RightEdge) {
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-  return 0;
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-static int __pyx_tp_clear_2yt_9amr_utils_PartitionedGrid(PyObject *o) {
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-  PyObject* tmp;
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-  p->my_data = Py_None; Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
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-  p->LeftEdge = Py_None; Py_INCREF(Py_None);
-  Py_XDECREF(tmp);
-  tmp = ((PyObject*)p->RightEdge);
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-  Py_XDECREF(tmp);
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-}
-
-static int __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_my_data(PyObject *o, PyObject *v, void *x) {
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-static int __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_LeftEdge(PyObject *o, PyObject *v, void *x) {
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-static int __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_n_fields(PyObject *o, PyObject *v, void *x) {
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-static PyObject *__pyx_tp_new_2yt_9amr_utils_GridFace(PyTypeObject *t, PyObject *a, PyObject *k) {
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-
-static void __pyx_tp_dealloc_2yt_9amr_utils_GridFace(PyObject *o) {
-  (*Py_TYPE(o)->tp_free)(o);
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-
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-}
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-static int __pyx_setprop_2yt_9amr_utils_8GridFace_coord(PyObject *o, PyObject *v, void *x) {
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-    return __pyx_pf_2yt_9amr_utils_8GridFace_5coord___set__(o, v);
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-  else {
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-static PyMethodDef __pyx_methods_2yt_9amr_utils_GridFace[] = {
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-
-static PyObject *__pyx_tp_new_2yt_9amr_utils_ProtoPrism(PyTypeObject *t, PyObject *a, PyObject *k) {
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-static void __pyx_tp_dealloc_2yt_9amr_utils_ProtoPrism(PyObject *o) {
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-  Py_XDECREF(p->RightEdge);
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-static int __pyx_tp_traverse_2yt_9amr_utils_ProtoPrism(PyObject *o, visitproc v, void *a) {
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-static int __pyx_tp_clear_2yt_9amr_utils_ProtoPrism(PyObject *o) {
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-}
-
-static int __pyx_setprop_2yt_9amr_utils_10ProtoPrism_LeftEdge(PyObject *o, PyObject *v, void *x) {
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-static PyObject *__pyx_getprop_2yt_9amr_utils_10ProtoPrism_RightEdge(PyObject *o, void *x) {
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-static int __pyx_setprop_2yt_9amr_utils_10ProtoPrism_RightEdge(PyObject *o, PyObject *v, void *x) {
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-static PyObject *__pyx_getprop_2yt_9amr_utils_10ProtoPrism_subgrid_faces(PyObject *o, void *x) {
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-
-static int __pyx_setprop_2yt_9amr_utils_10ProtoPrism_subgrid_faces(PyObject *o, PyObject *v, void *x) {
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-static PyObject *__pyx_getprop_2yt_9amr_utils_10ProtoPrism_parent_grid_id(PyObject *o, void *x) {
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-  if (__Pyx_SetVtable(__pyx_type_2yt_9amr_utils_VectorPlane.tp_dict, __pyx_vtabptr_2yt_9amr_utils_VectorPlane) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 222; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  if (__Pyx_SetAttrString(__pyx_m, "VectorPlane", (PyObject *)&__pyx_type_2yt_9amr_utils_VectorPlane) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 222; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-  if (__Pyx_SetAttrString(__pyx_m, "TransferFunctionProxy", (PyObject *)&__pyx_type_2yt_9amr_utils_TransferFunctionProxy) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 118; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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-                for (name = first_kw_arg; *name; name++) {
-                    #if PY_MAJOR_VERSION >= 3
-                    if (PyUnicode_GET_SIZE(**name) == PyUnicode_GET_SIZE(key) &&
-                        PyUnicode_Compare(**name, key) == 0) break;
-                    #else
-                    if (PyString_GET_SIZE(**name) == PyString_GET_SIZE(key) &&
-                        _PyString_Eq(**name, key)) break;
-                    #endif
-                }
-                if (*name) {
-                    values[name-argnames] = value;
-                } else {
-                    /* unexpected keyword found */
-                    for (name=argnames; name != first_kw_arg; name++) {
-                        if (**name == key) goto arg_passed_twice;
-                        #if PY_MAJOR_VERSION >= 3
-                        if (PyUnicode_GET_SIZE(**name) == PyUnicode_GET_SIZE(key) &&
-                            PyUnicode_Compare(**name, key) == 0) goto arg_passed_twice;
-                        #else
-                        if (PyString_GET_SIZE(**name) == PyString_GET_SIZE(key) &&
-                            _PyString_Eq(**name, key)) goto arg_passed_twice;
-                        #endif
-                    }
-                    if (kwds2) {
-                        if (unlikely(PyDict_SetItem(kwds2, key, value))) goto bad;
-                    } else {
-                        goto invalid_keyword;
-                    }
-                }
-            }
-        }
-    }
-    return 0;
-arg_passed_twice:
-    __Pyx_RaiseDoubleKeywordsError(function_name, **name);
-    goto bad;
-invalid_keyword_type:
-    PyErr_Format(PyExc_TypeError,
-        "%s() keywords must be strings", function_name);
-    goto bad;
-invalid_keyword:
-    PyErr_Format(PyExc_TypeError,
-    #if PY_MAJOR_VERSION < 3
-        "%s() got an unexpected keyword argument '%s'",
-        function_name, PyString_AsString(key));
-    #else
-        "%s() got an unexpected keyword argument '%U'",
-        function_name, key);
-    #endif
-bad:
-    return -1;
-}
-
-static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
-    const char *name, int exact)
-{
-    if (!type) {
-        PyErr_Format(PyExc_SystemError, "Missing type object");
-        return 0;
-    }
-    if (none_allowed && obj == Py_None) return 1;
-    else if (exact) {
-        if (Py_TYPE(obj) == type) return 1;
-    }
-    else {
-        if (PyObject_TypeCheck(obj, type)) return 1;
-    }
-    PyErr_Format(PyExc_TypeError,
-        "Argument '%s' has incorrect type (expected %s, got %s)",
-        name, type->tp_name, Py_TYPE(obj)->tp_name);
-    return 0;
-}
-
-static CYTHON_INLINE int __Pyx_IsLittleEndian(void) {
-  unsigned int n = 1;
-  return *(unsigned char*)(&n) != 0;
-}
-
-typedef struct {
-  __Pyx_StructField root;
-  __Pyx_BufFmt_StackElem* head;
-  size_t fmt_offset;
-  int new_count, enc_count;
-  int is_complex;
-  char enc_type;
-  char packmode;
-} __Pyx_BufFmt_Context;
-
-static void __Pyx_BufFmt_Init(__Pyx_BufFmt_Context* ctx,
-                              __Pyx_BufFmt_StackElem* stack,
-                              __Pyx_TypeInfo* type) {
-  stack[0].field = &ctx->root;
-  stack[0].parent_offset = 0;
-  ctx->root.type = type;
-  ctx->root.name = "buffer dtype";
-  ctx->root.offset = 0;
-  ctx->head = stack;
-  ctx->head->field = &ctx->root;
-  ctx->fmt_offset = 0;
-  ctx->head->parent_offset = 0;
-  ctx->packmode = '@';
-  ctx->new_count = 1;
-  ctx->enc_count = 0;
-  ctx->enc_type = 0;
-  ctx->is_complex = 0;
-  while (type->typegroup == 'S') {
-    ++ctx->head;
-    ctx->head->field = type->fields;
-    ctx->head->parent_offset = 0;
-    type = type->fields->type;
-  }
-}
-
-static int __Pyx_BufFmt_ParseNumber(const char** ts) {
-    int count;
-    const char* t = *ts;
-    if (*t < '0' || *t > '9') {
-      return -1;
-    } else {
-        count = *t++ - '0';
-        while (*t >= '0' && *t < '9') {
-            count *= 10;
-            count += *t++ - '0';
-        }
-    }
-    *ts = t;
-    return count;
-}
-
-static void __Pyx_BufFmt_RaiseUnexpectedChar(char ch) {
-  char msg[] = {ch, 0};
-  PyErr_Format(PyExc_ValueError, "Unexpected format string character: '%s'", msg);
-}
-
-static const char* __Pyx_BufFmt_DescribeTypeChar(char ch, int is_complex) {
-  switch (ch) {
-    case 'b': return "'char'";
-    case 'B': return "'unsigned char'";
-    case 'h': return "'short'";
-    case 'H': return "'unsigned short'";
-    case 'i': return "'int'";
-    case 'I': return "'unsigned int'";
-    case 'l': return "'long'";
-    case 'L': return "'unsigned long'";
-    case 'q': return "'long long'";
-    case 'Q': return "'unsigned long long'";
-    case 'f': return (is_complex ? "'complex float'" : "'float'");
-    case 'd': return (is_complex ? "'complex double'" : "'double'");
-    case 'g': return (is_complex ? "'complex long double'" : "'long double'");
-    case 'T': return "a struct";
-    case 'O': return "Python object";
-    case 'P': return "a pointer";
-    case 0: return "end";
-    default: return "unparseable format string";
-  }
-}
-
-static size_t __Pyx_BufFmt_TypeCharToStandardSize(char ch, int is_complex) {
-  switch (ch) {
-    case '?': case 'c': case 'b': case 'B': return 1;
-    case 'h': case 'H': return 2;
-    case 'i': case 'I': case 'l': case 'L': return 4;
-    case 'q': case 'Q': return 8;
-    case 'f': return (is_complex ? 8 : 4);
-    case 'd': return (is_complex ? 16 : 8);
-    case 'g': {
-      PyErr_SetString(PyExc_ValueError, "Python does not define a standard format string size for long double ('g')..");
-      return 0;
-    }
-    case 'O': case 'P': return sizeof(void*);
-    default:
-      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
-      return 0;
-    }
-}
-
-static size_t __Pyx_BufFmt_TypeCharToNativeSize(char ch, int is_complex) {
-  switch (ch) {
-    case 'c': case 'b': case 'B': return 1;
-    case 'h': case 'H': return sizeof(short);
-    case 'i': case 'I': return sizeof(int);
-    case 'l': case 'L': return sizeof(long);
-    #ifdef HAVE_LONG_LONG
-    case 'q': case 'Q': return sizeof(PY_LONG_LONG);
-    #endif
-    case 'f': return sizeof(float) * (is_complex ? 2 : 1);
-    case 'd': return sizeof(double) * (is_complex ? 2 : 1);
-    case 'g': return sizeof(long double) * (is_complex ? 2 : 1);
-    case 'O': case 'P': return sizeof(void*);
-    default: {
-      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
-      return 0;
-    }    
-  }
-}
-
-typedef struct { char c; short x; } __Pyx_st_short;
-typedef struct { char c; int x; } __Pyx_st_int;
-typedef struct { char c; long x; } __Pyx_st_long;
-typedef struct { char c; float x; } __Pyx_st_float;
-typedef struct { char c; double x; } __Pyx_st_double;
-typedef struct { char c; long double x; } __Pyx_st_longdouble;
-typedef struct { char c; void *x; } __Pyx_st_void_p;
-#ifdef HAVE_LONG_LONG
-typedef struct { char c; PY_LONG_LONG x; } __Pyx_s_long_long;
-#endif
-
-static size_t __Pyx_BufFmt_TypeCharToAlignment(char ch, int is_complex) {
-  switch (ch) {
-    case '?': case 'c': case 'b': case 'B': return 1;
-    case 'h': case 'H': return sizeof(__Pyx_st_short) - sizeof(short);
-    case 'i': case 'I': return sizeof(__Pyx_st_int) - sizeof(int);
-    case 'l': case 'L': return sizeof(__Pyx_st_long) - sizeof(long);
-#ifdef HAVE_LONG_LONG
-    case 'q': case 'Q': return sizeof(__Pyx_s_long_long) - sizeof(PY_LONG_LONG);
-#endif
-    case 'f': return sizeof(__Pyx_st_float) - sizeof(float);
-    case 'd': return sizeof(__Pyx_st_double) - sizeof(double);
-    case 'g': return sizeof(__Pyx_st_longdouble) - sizeof(long double);
-    case 'P': case 'O': return sizeof(__Pyx_st_void_p) - sizeof(void*);
-    default:
-      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
-      return 0;
-    }
-}
-
-static size_t __Pyx_BufFmt_TypeCharToGroup(char ch, int is_complex) {
-  switch (ch) {
-    case 'c': case 'b': case 'h': case 'i': case 'l': case 'q': return 'I';
-    case 'B': case 'H': case 'I': case 'L': case 'Q': return 'U';
-    case 'f': case 'd': case 'g': return (is_complex ? 'C' : 'R');
-    case 'O': return 'O';
-    case 'P': return 'P';
-    default: {
-      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
-      return 0;
-    }    
-  }
-}
-
-static void __Pyx_BufFmt_RaiseExpected(__Pyx_BufFmt_Context* ctx) {
-  if (ctx->head == NULL || ctx->head->field == &ctx->root) {
-    const char* expected;
-    const char* quote;
-    if (ctx->head == NULL) {
-      expected = "end";
-      quote = "";
-    } else {
-      expected = ctx->head->field->type->name;
-      quote = "'";
-    }
-    PyErr_Format(PyExc_ValueError,
-                 "Buffer dtype mismatch, expected %s%s%s but got %s",
-                 quote, expected, quote,
-                 __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex));
-  } else {
-    __Pyx_StructField* field = ctx->head->field;
-    __Pyx_StructField* parent = (ctx->head - 1)->field;
-    PyErr_Format(PyExc_ValueError,
-                 "Buffer dtype mismatch, expected '%s' but got %s in '%s.%s'",
-                 field->type->name, __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex),
-                 parent->type->name, field->name);
-  }
-}
-
-static int __Pyx_BufFmt_ProcessTypeChunk(__Pyx_BufFmt_Context* ctx) {
-  char group;
-  size_t size, offset;
-  if (ctx->enc_type == 0) return 0;
-  group = __Pyx_BufFmt_TypeCharToGroup(ctx->enc_type, ctx->is_complex);
-  do {
-    __Pyx_StructField* field = ctx->head->field;
-    __Pyx_TypeInfo* type = field->type;
-  
-    if (ctx->packmode == '@' || ctx->packmode == '^') {
-      size = __Pyx_BufFmt_TypeCharToNativeSize(ctx->enc_type, ctx->is_complex);
-    } else {
-      size = __Pyx_BufFmt_TypeCharToStandardSize(ctx->enc_type, ctx->is_complex);
-    }
-    if (ctx->packmode == '@') {
-      int align_at = __Pyx_BufFmt_TypeCharToAlignment(ctx->enc_type, ctx->is_complex);
-      int align_mod_offset;
-      if (align_at == 0) return -1;
-      align_mod_offset = ctx->fmt_offset % align_at;
-      if (align_mod_offset > 0) ctx->fmt_offset += align_at - align_mod_offset;
-    }
-
-    if (type->size != size || type->typegroup != group) {
-      if (type->typegroup == 'C' && type->fields != NULL) {
-        /* special case -- treat as struct rather than complex number */
-        size_t parent_offset = ctx->head->parent_offset + field->offset;
-        ++ctx->head;
-        ctx->head->field = type->fields;
-        ctx->head->parent_offset = parent_offset;
-        continue;
-      }
-    
-      __Pyx_BufFmt_RaiseExpected(ctx);
-      return -1;
-    }
-
-    offset = ctx->head->parent_offset + field->offset;
-    if (ctx->fmt_offset != offset) {
-      PyErr_Format(PyExc_ValueError,
-                   "Buffer dtype mismatch; next field is at offset %"PY_FORMAT_SIZE_T"d "
-                   "but %"PY_FORMAT_SIZE_T"d expected", ctx->fmt_offset, offset);
-      return -1;
-    }
-
-    ctx->fmt_offset += size;
-  
-    --ctx->enc_count; /* Consume from buffer string */
-
-    /* Done checking, move to next field, pushing or popping struct stack if needed */
-    while (1) {
-      if (field == &ctx->root) {
-        ctx->head = NULL;
-        if (ctx->enc_count != 0) {
-          __Pyx_BufFmt_RaiseExpected(ctx);
-          return -1;
-        }
-        break; /* breaks both loops as ctx->enc_count == 0 */
-      }
-      ctx->head->field = ++field;
-      if (field->type == NULL) {
-        --ctx->head;
-        field = ctx->head->field;
-        continue;
-      } else if (field->type->typegroup == 'S') {
-        size_t parent_offset = ctx->head->parent_offset + field->offset;
-        if (field->type->fields->type == NULL) continue; /* empty struct */
-        field = field->type->fields;
-        ++ctx->head;
-        ctx->head->field = field;
-        ctx->head->parent_offset = parent_offset;
-        break;
-      } else {
-        break;
-      }
-    }
-  } while (ctx->enc_count);
-  ctx->enc_type = 0;
-  ctx->is_complex = 0;
-  return 0;    
-}
-
-static int __Pyx_BufFmt_FirstPack(__Pyx_BufFmt_Context* ctx) {
-  if (ctx->enc_type != 0 || ctx->packmode != '@') {
-    PyErr_SetString(PyExc_ValueError, "Buffer packing mode currently only allowed at beginning of format string (this is a defect)");
-    return -1;
-  }
-  return 0;
-}
-
-static const char* __Pyx_BufFmt_CheckString(__Pyx_BufFmt_Context* ctx, const char* ts) {
-  int got_Z = 0;
-  while (1) {
-    switch(*ts) {
-      case 0:
-        if (ctx->enc_type != 0 && ctx->head == NULL) {
-          __Pyx_BufFmt_RaiseExpected(ctx);
-          return NULL;
-        }
-        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
-        if (ctx->head != NULL) {
-          __Pyx_BufFmt_RaiseExpected(ctx);
-          return NULL;
-        }
-        return ts;
-      case ' ':
-      case 10:
-      case 13:
-        ++ts;
-        break;
-      case '<':
-        if (!__Pyx_IsLittleEndian()) {
-          PyErr_SetString(PyExc_ValueError, "Little-endian buffer not supported on big-endian compiler");
-          return NULL;
-        }
-        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
-        ctx->packmode = '=';
-        ++ts;
-        break;
-      case '>':
-      case '!':
-        if (__Pyx_IsLittleEndian()) {
-          PyErr_SetString(PyExc_ValueError, "Big-endian buffer not supported on little-endian compiler");
-          return NULL;
-        }
-        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
-        ctx->packmode = '=';
-        ++ts;
-        break;
-      case '=':
-      case '@':
-      case '^':
-        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
-        ctx->packmode = *ts++;
-        break;
-      case 'T': /* substruct */
-        {
-          int i;
-          const char* ts_after_sub;
-          int struct_count = ctx->new_count;
-          ctx->new_count = 1;
-          ++ts;
-          if (*ts != '{') {
-            PyErr_SetString(PyExc_ValueError, "Buffer acquisition: Expected '{' after 'T'");
-            return NULL;
-          }
-          ++ts;
-          ts_after_sub = ts;
-          for (i = 0; i != struct_count; ++i) {
-            ts_after_sub = __Pyx_BufFmt_CheckString(ctx, ts);
-            if (!ts_after_sub) return NULL;
-          }
-          ts = ts_after_sub;
-        }
-        break;
-      case '}': /* end of substruct; either repeat or move on */
-        ++ts;
-        return ts;
-      case 'x':
-        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
-        ctx->fmt_offset += ctx->new_count;
-        ctx->new_count = 1;
-        ctx->enc_count = 0;
-        ctx->enc_type = 0;
-        ++ts;
-        break;
-      case 'Z':
-        got_Z = 1;
-        ++ts;
-        if (*ts != 'f' && *ts != 'd' && *ts != 'g') {
-          __Pyx_BufFmt_RaiseUnexpectedChar('Z');
-          return NULL;
-        }        /* fall through */
-      case 'c': case 'b': case 'B': case 'h': case 'H': case 'i': case 'I':
-      case 'l': case 'L': case 'q': case 'Q':
-      case 'f': case 'd': case 'g':
-      case 'O':
-        if (ctx->enc_type == *ts && got_Z == ctx->is_complex) {
-          /* Continue pooling same type */
-          ctx->enc_count += ctx->new_count;
-        } else {
-          /* New type */
-          if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
-          ctx->enc_count = ctx->new_count;
-          ctx->enc_type = *ts;
-          ctx->is_complex = got_Z;
-        }
-        ++ts;
-        ctx->new_count = 1;
-        got_Z = 0;
-        break;
-      default:
-        {
-          ctx->new_count = __Pyx_BufFmt_ParseNumber(&ts);
-          if (ctx->new_count == -1) { /* First char was not a digit */
-            char msg[2] = { *ts, 0 };
-            PyErr_Format(PyExc_ValueError,
-                         "Does not understand character buffer dtype format string ('%s')", msg);
-            return NULL;
-          }
-        }
-      
-    }
-  }
-}
-
-static CYTHON_INLINE void __Pyx_ZeroBuffer(Py_buffer* buf) {
-  buf->buf = NULL;
-  buf->obj = NULL;
-  buf->strides = __Pyx_zeros;
-  buf->shape = __Pyx_zeros;
-  buf->suboffsets = __Pyx_minusones;
-}
-
-static CYTHON_INLINE int __Pyx_GetBufferAndValidate(Py_buffer* buf, PyObject* obj, __Pyx_TypeInfo* dtype, int flags, int nd, int cast, __Pyx_BufFmt_StackElem* stack) {
-  if (obj == Py_None) {
-    __Pyx_ZeroBuffer(buf);
-    return 0;
-  }
-  buf->buf = NULL;
-  if (__Pyx_GetBuffer(obj, buf, flags) == -1) goto fail;
-  if (buf->ndim != nd) {
-    PyErr_Format(PyExc_ValueError,
-                 "Buffer has wrong number of dimensions (expected %d, got %d)",
-                 nd, buf->ndim);
-    goto fail;
-  }
-  if (!cast) {
-    __Pyx_BufFmt_Context ctx;
-    __Pyx_BufFmt_Init(&ctx, stack, dtype);
-    if (!__Pyx_BufFmt_CheckString(&ctx, buf->format)) goto fail;
-  }
-  if ((unsigned)buf->itemsize != dtype->size) {
-    PyErr_Format(PyExc_ValueError,
-      "Item size of buffer (%"PY_FORMAT_SIZE_T"d byte%s) does not match size of '%s' (%"PY_FORMAT_SIZE_T"d byte%s)",
-      buf->itemsize, (buf->itemsize > 1) ? "s" : "",
-      dtype->name,
-      dtype->size, (dtype->size > 1) ? "s" : "");
-    goto fail;
-  }
-  if (buf->suboffsets == NULL) buf->suboffsets = __Pyx_minusones;
-  return 0;
-fail:;
-  __Pyx_ZeroBuffer(buf);
-  return -1;
-}
-
-static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info) {
-  if (info->buf == NULL) return;
-  if (info->suboffsets == __Pyx_minusones) info->suboffsets = NULL;
-  __Pyx_ReleaseBuffer(info);
-}
-
-static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb) {
-    PyObject *tmp_type, *tmp_value, *tmp_tb;
-    PyThreadState *tstate = PyThreadState_GET();
-
-    tmp_type = tstate->curexc_type;
-    tmp_value = tstate->curexc_value;
-    tmp_tb = tstate->curexc_traceback;
-    tstate->curexc_type = type;
-    tstate->curexc_value = value;
-    tstate->curexc_traceback = tb;
-    Py_XDECREF(tmp_type);
-    Py_XDECREF(tmp_value);
-    Py_XDECREF(tmp_tb);
-}
-
-static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb) {
-    PyThreadState *tstate = PyThreadState_GET();
-    *type = tstate->curexc_type;
-    *value = tstate->curexc_value;
-    *tb = tstate->curexc_traceback;
-
-    tstate->curexc_type = 0;
-    tstate->curexc_value = 0;
-    tstate->curexc_traceback = 0;
-}
-
-
-
-static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
-    if (unlikely(!type)) {
-        PyErr_Format(PyExc_SystemError, "Missing type object");
-        return 0;
-    }
-    if (likely(PyObject_TypeCheck(obj, type)))
-        return 1;
-    PyErr_Format(PyExc_TypeError, "Cannot convert %.200s to %.200s",
-                 Py_TYPE(obj)->tp_name, type->tp_name);
-    return 0;
-}
-
-static void __Pyx_RaiseBufferFallbackError(void) {
-  PyErr_Format(PyExc_ValueError,
-     "Buffer acquisition failed on assignment; and then reacquiring the old buffer failed too!");
-}
-
-static void __Pyx_RaiseBufferIndexError(int axis) {
-  PyErr_Format(PyExc_IndexError,
-     "Out of bounds on buffer access (axis %d)", axis);
-}
-
-
-static CYTHON_INLINE long __Pyx_mod_long(long a, long b) {
-    long r = a % b;
-    r += ((r != 0) & ((r ^ b) < 0)) * b;
-    return r;
-}
-
-static CYTHON_INLINE long __Pyx_div_long(long a, long b) {
-    long q = a / b;
-    long r = a - q*b;
-    q -= ((r != 0) & ((r ^ b) < 0));
-    return q;
-}
-
-static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index) {
-    PyErr_Format(PyExc_ValueError,
-        #if PY_VERSION_HEX < 0x02050000
-                 "need more than %d value%s to unpack", (int)index,
-        #else
-                 "need more than %zd value%s to unpack", index,
-        #endif
-                 (index == 1) ? "" : "s");
-}
-
-static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected) {
-    PyErr_Format(PyExc_ValueError,
-        #if PY_VERSION_HEX < 0x02050000
-            "too many values to unpack (expected %d)", (int)expected);
-        #else
-            "too many values to unpack (expected %zd)", expected);
-        #endif
-}
-
-static PyObject *__Pyx_UnpackItem(PyObject *iter, Py_ssize_t index) {
-    PyObject *item;
-    if (!(item = PyIter_Next(iter))) {
-        if (!PyErr_Occurred()) {
-            __Pyx_RaiseNeedMoreValuesError(index);
-        }
-    }
-    return item;
-}
-
-static int __Pyx_EndUnpack(PyObject *iter, Py_ssize_t expected) {
-    PyObject *item;
-    if ((item = PyIter_Next(iter))) {
-        Py_DECREF(item);
-        __Pyx_RaiseTooManyValuesError(expected);
-        return -1;
-    }
-    else if (!PyErr_Occurred())
-        return 0;
-    else
-        return -1;
-}
-
-
-static CYTHON_INLINE __pyx_t_5numpy_int64_t __Pyx_div___pyx_t_5numpy_int64_t(__pyx_t_5numpy_int64_t a, __pyx_t_5numpy_int64_t b) {
-    __pyx_t_5numpy_int64_t q = a / b;
-    __pyx_t_5numpy_int64_t r = a - q*b;
-    q -= ((r != 0) & ((r ^ b) < 0));
-    return q;
-}
-
-static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void) {
-    PyErr_SetString(PyExc_TypeError, "'NoneType' object is not iterable");
-}
-
-static void __Pyx_UnpackTupleError(PyObject *t, Py_ssize_t index) {
-    if (t == Py_None) {
-      __Pyx_RaiseNoneNotIterableError();
-    } else if (PyTuple_GET_SIZE(t) < index) {
-      __Pyx_RaiseNeedMoreValuesError(PyTuple_GET_SIZE(t));
-    } else {
-      __Pyx_RaiseTooManyValuesError(index);
-    }
-}
-
-#if PY_MAJOR_VERSION < 3
-static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags) {
-  #if PY_VERSION_HEX >= 0x02060000
-  if (Py_TYPE(obj)->tp_flags & Py_TPFLAGS_HAVE_NEWBUFFER)
-      return PyObject_GetBuffer(obj, view, flags);
-  #endif
-  if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) return __pyx_pf_5numpy_7ndarray___getbuffer__(obj, view, flags);
-  else {
-  PyErr_Format(PyExc_TypeError, "'%100s' does not have the buffer interface", Py_TYPE(obj)->tp_name);
-  return -1;
-    }
-}
-
-static void __Pyx_ReleaseBuffer(Py_buffer *view) {
-  PyObject* obj = view->obj;
-  if (obj) {
-if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) __pyx_pf_5numpy_7ndarray___releasebuffer__(obj, view);
-    Py_DECREF(obj);
-    view->obj = NULL;
-  }
-}
-
-#endif
-
-static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list) {
-    PyObject *py_import = 0;
-    PyObject *empty_list = 0;
-    PyObject *module = 0;
-    PyObject *global_dict = 0;
-    PyObject *empty_dict = 0;
-    PyObject *list;
-    py_import = __Pyx_GetAttrString(__pyx_b, "__import__");
-    if (!py_import)
-        goto bad;
-    if (from_list)
-        list = from_list;
-    else {
-        empty_list = PyList_New(0);
-        if (!empty_list)
-            goto bad;
-        list = empty_list;
-    }
-    global_dict = PyModule_GetDict(__pyx_m);
-    if (!global_dict)
-        goto bad;
-    empty_dict = PyDict_New();
-    if (!empty_dict)
-        goto bad;
-    module = PyObject_CallFunctionObjArgs(py_import,
-        name, global_dict, empty_dict, list, NULL);
-bad:
-    Py_XDECREF(empty_list);
-    Py_XDECREF(py_import);
-    Py_XDECREF(empty_dict);
-    return module;
-}
-
-static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_intp(npy_intp val) {
-    const npy_intp neg_one = (npy_intp)-1, const_zero = (npy_intp)0;
-    const int is_unsigned = const_zero < neg_one;
-    if ((sizeof(npy_intp) == sizeof(char))  ||
-        (sizeof(npy_intp) == sizeof(short))) {
-        return PyInt_FromLong((long)val);
-    } else if ((sizeof(npy_intp) == sizeof(int)) ||
-               (sizeof(npy_intp) == sizeof(long))) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLong((unsigned long)val);
-        else
-            return PyInt_FromLong((long)val);
-    } else if (sizeof(npy_intp) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
-        else
-            return PyLong_FromLongLong((PY_LONG_LONG)val);
-    } else {
-        int one = 1; int little = (int)*(unsigned char *)&one;
-        unsigned char *bytes = (unsigned char *)&val;
-        return _PyLong_FromByteArray(bytes, sizeof(npy_intp), 
-                                     little, !is_unsigned);
-    }
-}
-
-static CYTHON_INLINE npy_int32 __Pyx_PyInt_from_py_npy_int32(PyObject* x) {
-    const npy_int32 neg_one = (npy_int32)-1, const_zero = (npy_int32)0;
-    const int is_unsigned = const_zero < neg_one;
-    if (sizeof(npy_int32) == sizeof(char)) {
-        if (is_unsigned)
-            return (npy_int32)__Pyx_PyInt_AsUnsignedChar(x);
-        else
-            return (npy_int32)__Pyx_PyInt_AsSignedChar(x);
-    } else if (sizeof(npy_int32) == sizeof(short)) {
-        if (is_unsigned)
-            return (npy_int32)__Pyx_PyInt_AsUnsignedShort(x);
-        else
-            return (npy_int32)__Pyx_PyInt_AsSignedShort(x);
-    } else if (sizeof(npy_int32) == sizeof(int)) {
-        if (is_unsigned)
-            return (npy_int32)__Pyx_PyInt_AsUnsignedInt(x);
-        else
-            return (npy_int32)__Pyx_PyInt_AsSignedInt(x);
-    } else if (sizeof(npy_int32) == sizeof(long)) {
-        if (is_unsigned)
-            return (npy_int32)__Pyx_PyInt_AsUnsignedLong(x);
-        else
-            return (npy_int32)__Pyx_PyInt_AsSignedLong(x);
-    } else if (sizeof(npy_int32) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return (npy_int32)__Pyx_PyInt_AsUnsignedLongLong(x);
-        else
-            return (npy_int32)__Pyx_PyInt_AsSignedLongLong(x);
-    }  else {
-        npy_int32 val;
-        PyObject *v = __Pyx_PyNumber_Int(x);
-        #if PY_VERSION_HEX < 0x03000000
-        if (likely(v) && !PyLong_Check(v)) {
-            PyObject *tmp = v;
-            v = PyNumber_Long(tmp);
-            Py_DECREF(tmp);
-        }
-        #endif
-        if (likely(v)) {
-            int one = 1; int is_little = (int)*(unsigned char *)&one;
-            unsigned char *bytes = (unsigned char *)&val;
-            int ret = _PyLong_AsByteArray((PyLongObject *)v,
-                                          bytes, sizeof(val),
-                                          is_little, !is_unsigned);
-            Py_DECREF(v);
-            if (likely(!ret))
-                return val;
-        }
-        return (npy_int32)-1;
-    }
-}
-
-static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int32(npy_int32 val) {
-    const npy_int32 neg_one = (npy_int32)-1, const_zero = (npy_int32)0;
-    const int is_unsigned = const_zero < neg_one;
-    if ((sizeof(npy_int32) == sizeof(char))  ||
-        (sizeof(npy_int32) == sizeof(short))) {
-        return PyInt_FromLong((long)val);
-    } else if ((sizeof(npy_int32) == sizeof(int)) ||
-               (sizeof(npy_int32) == sizeof(long))) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLong((unsigned long)val);
-        else
-            return PyInt_FromLong((long)val);
-    } else if (sizeof(npy_int32) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
-        else
-            return PyLong_FromLongLong((PY_LONG_LONG)val);
-    } else {
-        int one = 1; int little = (int)*(unsigned char *)&one;
-        unsigned char *bytes = (unsigned char *)&val;
-        return _PyLong_FromByteArray(bytes, sizeof(npy_int32), 
-                                     little, !is_unsigned);
-    }
-}
-
-#if PY_MAJOR_VERSION < 3
-static PyObject *__Pyx_GetStdout(void) {
-    PyObject *f = PySys_GetObject((char *)"stdout");
-    if (!f) {
-        PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");
-    }
-    return f;
-}
-
-static int __Pyx_Print(PyObject* f, PyObject *arg_tuple, int newline) {
-    PyObject* v;
-    int i;
-
-    if (!f) {
-        if (!(f = __Pyx_GetStdout()))
-            return -1;
-    }
-    for (i=0; i < PyTuple_GET_SIZE(arg_tuple); i++) {
-        if (PyFile_SoftSpace(f, 1)) {
-            if (PyFile_WriteString(" ", f) < 0)
-                return -1;
-        }
-        v = PyTuple_GET_ITEM(arg_tuple, i);
-        if (PyFile_WriteObject(v, f, Py_PRINT_RAW) < 0)
-            return -1;
-        if (PyString_Check(v)) {
-            char *s = PyString_AsString(v);
-            Py_ssize_t len = PyString_Size(v);
-            if (len > 0 &&
-                isspace(Py_CHARMASK(s[len-1])) &&
-                s[len-1] != ' ')
-                    PyFile_SoftSpace(f, 0);
-        }
-    }
-    if (newline) {
-        if (PyFile_WriteString("\n", f) < 0)
-            return -1;
-        PyFile_SoftSpace(f, 0);
-    }
-    return 0;
-}
-
-#else /* Python 3 has a print function */
-
-static int __Pyx_Print(PyObject* stream, PyObject *arg_tuple, int newline) {
-    PyObject* kwargs = 0;
-    PyObject* result = 0;
-    PyObject* end_string;
-    if (unlikely(!__pyx_print)) {
-        __pyx_print = __Pyx_GetAttrString(__pyx_b, "print");
-        if (!__pyx_print)
-            return -1;
-    }
-    if (stream) {
-        kwargs = PyDict_New();
-        if (unlikely(!kwargs))
-            return -1;
-        if (unlikely(PyDict_SetItemString(kwargs, "file", stream) < 0))
-            goto bad;
-        if (!newline) {
-            end_string = PyUnicode_FromStringAndSize(" ", 1);
-            if (unlikely(!end_string))
-                goto bad;
-            if (PyDict_SetItemString(kwargs, "end", end_string) < 0) {
-                Py_DECREF(end_string);
-                goto bad;
-            }
-            Py_DECREF(end_string);
-        }
-    } else if (!newline) {
-        if (unlikely(!__pyx_print_kwargs)) {
-            __pyx_print_kwargs = PyDict_New();
-            if (unlikely(!__pyx_print_kwargs))
-                return -1;
-            end_string = PyUnicode_FromStringAndSize(" ", 1);
-            if (unlikely(!end_string))
-                return -1;
-            if (PyDict_SetItemString(__pyx_print_kwargs, "end", end_string) < 0) {
-                Py_DECREF(end_string);
-                return -1;
-            }
-            Py_DECREF(end_string);
-        }
-        kwargs = __pyx_print_kwargs;
-    }
-    result = PyObject_Call(__pyx_print, arg_tuple, kwargs);
-    if (unlikely(kwargs) && (kwargs != __pyx_print_kwargs))
-        Py_DECREF(kwargs);
-    if (!result)
-        return -1;
-    Py_DECREF(result);
-    return 0;
-bad:
-    if (kwargs != __pyx_print_kwargs)
-        Py_XDECREF(kwargs);
-    return -1;
-}
-
-#endif
-
-static CYTHON_INLINE npy_int64 __Pyx_PyInt_from_py_npy_int64(PyObject* x) {
-    const npy_int64 neg_one = (npy_int64)-1, const_zero = (npy_int64)0;
-    const int is_unsigned = const_zero < neg_one;
-    if (sizeof(npy_int64) == sizeof(char)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedChar(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedChar(x);
-    } else if (sizeof(npy_int64) == sizeof(short)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedShort(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedShort(x);
-    } else if (sizeof(npy_int64) == sizeof(int)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedInt(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedInt(x);
-    } else if (sizeof(npy_int64) == sizeof(long)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedLong(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedLong(x);
-    } else if (sizeof(npy_int64) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedLongLong(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedLongLong(x);
-    }  else {
-        npy_int64 val;
-        PyObject *v = __Pyx_PyNumber_Int(x);
-        #if PY_VERSION_HEX < 0x03000000
-        if (likely(v) && !PyLong_Check(v)) {
-            PyObject *tmp = v;
-            v = PyNumber_Long(tmp);
-            Py_DECREF(tmp);
-        }
-        #endif
-        if (likely(v)) {
-            int one = 1; int is_little = (int)*(unsigned char *)&one;
-            unsigned char *bytes = (unsigned char *)&val;
-            int ret = _PyLong_AsByteArray((PyLongObject *)v,
-                                          bytes, sizeof(val),
-                                          is_little, !is_unsigned);
-            Py_DECREF(v);
-            if (likely(!ret))
-                return val;
-        }
-        return (npy_int64)-1;
-    }
-}
-
-#if PY_MAJOR_VERSION < 3
-
-static int __Pyx_PrintOne(PyObject* f, PyObject *o) {
-    if (!f) {
-        if (!(f = __Pyx_GetStdout()))
-            return -1;
-    }
-    if (PyFile_SoftSpace(f, 0)) {
-        if (PyFile_WriteString(" ", f) < 0)
-            return -1;
-    }
-    if (PyFile_WriteObject(o, f, Py_PRINT_RAW) < 0)
-        return -1;
-    if (PyFile_WriteString("\n", f) < 0)
-        return -1;
-    return 0;
-    /* the line below is just to avoid compiler
-     * compiler warnings about unused functions */
-    return __Pyx_Print(f, NULL, 0);
-}
-
-#else /* Python 3 has a print function */
-
-static int __Pyx_PrintOne(PyObject* stream, PyObject *o) {
-    int res;
-    PyObject* arg_tuple = PyTuple_New(1);
-    if (unlikely(!arg_tuple))
-        return -1;
-    Py_INCREF(o);
-    PyTuple_SET_ITEM(arg_tuple, 0, o);
-    res = __Pyx_Print(stream, arg_tuple, 1);
-    Py_DECREF(arg_tuple);
-    return res;
-}
-
-#endif
-
-#if PY_MAJOR_VERSION < 3
-static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb) {
-    Py_XINCREF(type);
-    Py_XINCREF(value);
-    Py_XINCREF(tb);
-    /* First, check the traceback argument, replacing None with NULL. */
-    if (tb == Py_None) {
-        Py_DECREF(tb);
-        tb = 0;
-    }
-    else if (tb != NULL && !PyTraceBack_Check(tb)) {
-        PyErr_SetString(PyExc_TypeError,
-            "raise: arg 3 must be a traceback or None");
-        goto raise_error;
-    }
-    /* Next, replace a missing value with None */
-    if (value == NULL) {
-        value = Py_None;
-        Py_INCREF(value);
-    }
-    #if PY_VERSION_HEX < 0x02050000
-    if (!PyClass_Check(type))
-    #else
-    if (!PyType_Check(type))
-    #endif
-    {
-        /* Raising an instance.  The value should be a dummy. */
-        if (value != Py_None) {
-            PyErr_SetString(PyExc_TypeError,
-                "instance exception may not have a separate value");
-            goto raise_error;
-        }
-        /* Normalize to raise <class>, <instance> */
-        Py_DECREF(value);
-        value = type;
-        #if PY_VERSION_HEX < 0x02050000
-            if (PyInstance_Check(type)) {
-                type = (PyObject*) ((PyInstanceObject*)type)->in_class;
-                Py_INCREF(type);
-            }
-            else {
-                type = 0;
-                PyErr_SetString(PyExc_TypeError,
-                    "raise: exception must be an old-style class or instance");
-                goto raise_error;
-            }
-        #else
-            type = (PyObject*) Py_TYPE(type);
-            Py_INCREF(type);
-            if (!PyType_IsSubtype((PyTypeObject *)type, (PyTypeObject *)PyExc_BaseException)) {
-                PyErr_SetString(PyExc_TypeError,
-                    "raise: exception class must be a subclass of BaseException");
-                goto raise_error;
-            }
-        #endif
-    }
-
-    __Pyx_ErrRestore(type, value, tb);
-    return;
-raise_error:
-    Py_XDECREF(value);
-    Py_XDECREF(type);
-    Py_XDECREF(tb);
-    return;
-}
-
-#else /* Python 3+ */
-
-static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb) {
-    if (tb == Py_None) {
-        tb = 0;
-    } else if (tb && !PyTraceBack_Check(tb)) {
-        PyErr_SetString(PyExc_TypeError,
-            "raise: arg 3 must be a traceback or None");
-        goto bad;
-    }
-    if (value == Py_None)
-        value = 0;
-
-    if (PyExceptionInstance_Check(type)) {
-        if (value) {
-            PyErr_SetString(PyExc_TypeError,
-                "instance exception may not have a separate value");
-            goto bad;
-        }
-        value = type;
-        type = (PyObject*) Py_TYPE(value);
-    } else if (!PyExceptionClass_Check(type)) {
-        PyErr_SetString(PyExc_TypeError,
-            "raise: exception class must be a subclass of BaseException");
-        goto bad;
-    }
-
-    PyErr_SetObject(type, value);
-
-    if (tb) {
-        PyThreadState *tstate = PyThreadState_GET();
-        PyObject* tmp_tb = tstate->curexc_traceback;
-        if (tb != tmp_tb) {
-            Py_INCREF(tb);
-            tstate->curexc_traceback = tb;
-            Py_XDECREF(tmp_tb);
-        }
-    }
-
-bad:
-    return;
-}
-#endif
-
-static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int64(npy_int64 val) {
-    const npy_int64 neg_one = (npy_int64)-1, const_zero = (npy_int64)0;
-    const int is_unsigned = const_zero < neg_one;
-    if ((sizeof(npy_int64) == sizeof(char))  ||
-        (sizeof(npy_int64) == sizeof(short))) {
-        return PyInt_FromLong((long)val);
-    } else if ((sizeof(npy_int64) == sizeof(int)) ||
-               (sizeof(npy_int64) == sizeof(long))) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLong((unsigned long)val);
-        else
-            return PyInt_FromLong((long)val);
-    } else if (sizeof(npy_int64) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
-        else
-            return PyLong_FromLongLong((PY_LONG_LONG)val);
-    } else {
-        int one = 1; int little = (int)*(unsigned char *)&one;
-        unsigned char *bytes = (unsigned char *)&val;
-        return _PyLong_FromByteArray(bytes, sizeof(npy_int64), 
-                                     little, !is_unsigned);
-    }
-}
-
-static CYTHON_INLINE png_uint_32 __Pyx_PyInt_from_py_png_uint_32(PyObject* x) {
-    const png_uint_32 neg_one = (png_uint_32)-1, const_zero = (png_uint_32)0;
-    const int is_unsigned = const_zero < neg_one;
-    if (sizeof(png_uint_32) == sizeof(char)) {
-        if (is_unsigned)
-            return (png_uint_32)__Pyx_PyInt_AsUnsignedChar(x);
-        else
-            return (png_uint_32)__Pyx_PyInt_AsSignedChar(x);
-    } else if (sizeof(png_uint_32) == sizeof(short)) {
-        if (is_unsigned)
-            return (png_uint_32)__Pyx_PyInt_AsUnsignedShort(x);
-        else
-            return (png_uint_32)__Pyx_PyInt_AsSignedShort(x);
-    } else if (sizeof(png_uint_32) == sizeof(int)) {
-        if (is_unsigned)
-            return (png_uint_32)__Pyx_PyInt_AsUnsignedInt(x);
-        else
-            return (png_uint_32)__Pyx_PyInt_AsSignedInt(x);
-    } else if (sizeof(png_uint_32) == sizeof(long)) {
-        if (is_unsigned)
-            return (png_uint_32)__Pyx_PyInt_AsUnsignedLong(x);
-        else
-            return (png_uint_32)__Pyx_PyInt_AsSignedLong(x);
-    } else if (sizeof(png_uint_32) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return (png_uint_32)__Pyx_PyInt_AsUnsignedLongLong(x);
-        else
-            return (png_uint_32)__Pyx_PyInt_AsSignedLongLong(x);
-    }  else {
-        png_uint_32 val;
-        PyObject *v = __Pyx_PyNumber_Int(x);
-        #if PY_VERSION_HEX < 0x03000000
-        if (likely(v) && !PyLong_Check(v)) {
-            PyObject *tmp = v;
-            v = PyNumber_Long(tmp);
-            Py_DECREF(tmp);
-        }
-        #endif
-        if (likely(v)) {
-            int one = 1; int is_little = (int)*(unsigned char *)&one;
-            unsigned char *bytes = (unsigned char *)&val;
-            int ret = _PyLong_AsByteArray((PyLongObject *)v,
-                                          bytes, sizeof(val),
-                                          is_little, !is_unsigned);
-            Py_DECREF(v);
-            if (likely(!ret))
-                return val;
-        }
-        return (png_uint_32)-1;
-    }
-}
-
-static CYTHON_INLINE long __Pyx_pow_long(long b, long e) {
-    long t = b;
-    switch (e) {
-        case 3:
-            t *= b;
-        case 2:
-            t *= b;
-        case 1:
-            return t;
-        case 0:
-            return 1;
-    }
-    if (unlikely(e<0)) return 0;
-    t = 1;
-    while (likely(e)) {
-        t *= (b * (e&1)) | ((~e)&1);    /* 1 or b */
-        b *= b;
-        e >>= 1;
-    }
-    return t;
-}
-
-#if CYTHON_CCOMPLEX
-  #ifdef __cplusplus
-    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
-      return ::std::complex< float >(x, y);
-    }
-  #else
-    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
-      return x + y*(__pyx_t_float_complex)_Complex_I;
-    }
-  #endif
-#else
-    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
-      __pyx_t_float_complex z;
-      z.real = x;
-      z.imag = y;
-      return z;
-    }
-#endif
-
-#if CYTHON_CCOMPLEX
-#else
-    static CYTHON_INLINE int __Pyx_c_eqf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-       return (a.real == b.real) && (a.imag == b.imag);
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_sumf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-        __pyx_t_float_complex z;
-        z.real = a.real + b.real;
-        z.imag = a.imag + b.imag;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_difff(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-        __pyx_t_float_complex z;
-        z.real = a.real - b.real;
-        z.imag = a.imag - b.imag;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_prodf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-        __pyx_t_float_complex z;
-        z.real = a.real * b.real - a.imag * b.imag;
-        z.imag = a.real * b.imag + a.imag * b.real;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_quotf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-        __pyx_t_float_complex z;
-        float denom = b.real * b.real + b.imag * b.imag;
-        z.real = (a.real * b.real + a.imag * b.imag) / denom;
-        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_negf(__pyx_t_float_complex a) {
-        __pyx_t_float_complex z;
-        z.real = -a.real;
-        z.imag = -a.imag;
-        return z;
-    }
-    static CYTHON_INLINE int __Pyx_c_is_zerof(__pyx_t_float_complex a) {
-       return (a.real == 0) && (a.imag == 0);
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_conjf(__pyx_t_float_complex a) {
-        __pyx_t_float_complex z;
-        z.real =  a.real;
-        z.imag = -a.imag;
-        return z;
-    }
-/*
-    static CYTHON_INLINE float __Pyx_c_absf(__pyx_t_float_complex z) {
-#if HAVE_HYPOT
-        return hypotf(z.real, z.imag);
-#else
-        return sqrtf(z.real*z.real + z.imag*z.imag);
-#endif
-    }
-*/
-#endif
-
-#if CYTHON_CCOMPLEX
-  #ifdef __cplusplus
-    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
-      return ::std::complex< double >(x, y);
-    }
-  #else
-    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
-      return x + y*(__pyx_t_double_complex)_Complex_I;
-    }
-  #endif
-#else
-    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
-      __pyx_t_double_complex z;
-      z.real = x;
-      z.imag = y;
-      return z;
-    }
-#endif
-
-#if CYTHON_CCOMPLEX
-#else
-    static CYTHON_INLINE int __Pyx_c_eq(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-       return (a.real == b.real) && (a.imag == b.imag);
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_sum(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-        __pyx_t_double_complex z;
-        z.real = a.real + b.real;
-        z.imag = a.imag + b.imag;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_diff(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-        __pyx_t_double_complex z;
-        z.real = a.real - b.real;
-        z.imag = a.imag - b.imag;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_prod(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-        __pyx_t_double_complex z;
-        z.real = a.real * b.real - a.imag * b.imag;
-        z.imag = a.real * b.imag + a.imag * b.real;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_quot(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-        __pyx_t_double_complex z;
-        double denom = b.real * b.real + b.imag * b.imag;
-        z.real = (a.real * b.real + a.imag * b.imag) / denom;
-        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_neg(__pyx_t_double_complex a) {
-        __pyx_t_double_complex z;
-        z.real = -a.real;
-        z.imag = -a.imag;
-        return z;
-    }
-    static CYTHON_INLINE int __Pyx_c_is_zero(__pyx_t_double_complex a) {
-       return (a.real == 0) && (a.imag == 0);
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_conj(__pyx_t_double_complex a) {
-        __pyx_t_double_complex z;
-        z.real =  a.real;
-        z.imag = -a.imag;
-        return z;
-    }
-/*
-    static CYTHON_INLINE double __Pyx_c_abs(__pyx_t_double_complex z) {
-#if HAVE_HYPOT
-        return hypot(z.real, z.imag);
-#else
-        return sqrt(z.real*z.real + z.imag*z.imag);
-#endif
-    }
-*/
-#endif
-
-static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject* x) {
-    const unsigned char neg_one = (unsigned char)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(unsigned char) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(unsigned char)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to unsigned char" :
-                    "value too large to convert to unsigned char");
-            }
-            return (unsigned char)-1;
-        }
-        return (unsigned char)val;
-    }
-    return (unsigned char)__Pyx_PyInt_AsUnsignedLong(x);
-}
-
-static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject* x) {
-    const unsigned short neg_one = (unsigned short)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(unsigned short) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(unsigned short)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to unsigned short" :
-                    "value too large to convert to unsigned short");
-            }
-            return (unsigned short)-1;
-        }
-        return (unsigned short)val;
-    }
-    return (unsigned short)__Pyx_PyInt_AsUnsignedLong(x);
-}
-
-static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject* x) {
-    const unsigned int neg_one = (unsigned int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(unsigned int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(unsigned int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to unsigned int" :
-                    "value too large to convert to unsigned int");
-            }
-            return (unsigned int)-1;
-        }
-        return (unsigned int)val;
-    }
-    return (unsigned int)__Pyx_PyInt_AsUnsignedLong(x);
-}
-
-static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject* x) {
-    const char neg_one = (char)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(char) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(char)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to char" :
-                    "value too large to convert to char");
-            }
-            return (char)-1;
-        }
-        return (char)val;
-    }
-    return (char)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject* x) {
-    const short neg_one = (short)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(short) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(short)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to short" :
-                    "value too large to convert to short");
-            }
-            return (short)-1;
-        }
-        return (short)val;
-    }
-    return (short)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject* x) {
-    const int neg_one = (int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to int" :
-                    "value too large to convert to int");
-            }
-            return (int)-1;
-        }
-        return (int)val;
-    }
-    return (int)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject* x) {
-    const signed char neg_one = (signed char)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(signed char) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(signed char)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to signed char" :
-                    "value too large to convert to signed char");
-            }
-            return (signed char)-1;
-        }
-        return (signed char)val;
-    }
-    return (signed char)__Pyx_PyInt_AsSignedLong(x);
-}
-
-static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject* x) {
-    const signed short neg_one = (signed short)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(signed short) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(signed short)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to signed short" :
-                    "value too large to convert to signed short");
-            }
-            return (signed short)-1;
-        }
-        return (signed short)val;
-    }
-    return (signed short)__Pyx_PyInt_AsSignedLong(x);
-}
-
-static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject* x) {
-    const signed int neg_one = (signed int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(signed int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(signed int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to signed int" :
-                    "value too large to convert to signed int");
-            }
-            return (signed int)-1;
-        }
-        return (signed int)val;
-    }
-    return (signed int)__Pyx_PyInt_AsSignedLong(x);
-}
-
-static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject* x) {
-    const int neg_one = (int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to int" :
-                    "value too large to convert to int");
-            }
-            return (int)-1;
-        }
-        return (int)val;
-    }
-    return (int)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject* x) {
-    const unsigned long neg_one = (unsigned long)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to unsigned long");
-            return (unsigned long)-1;
-        }
-        return (unsigned long)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to unsigned long");
-                return (unsigned long)-1;
-            }
-            return PyLong_AsUnsignedLong(x);
-        } else {
-            return PyLong_AsLong(x);
-        }
-    } else {
-        unsigned long val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (unsigned long)-1;
-        val = __Pyx_PyInt_AsUnsignedLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject* x) {
-    const unsigned PY_LONG_LONG neg_one = (unsigned PY_LONG_LONG)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to unsigned PY_LONG_LONG");
-            return (unsigned PY_LONG_LONG)-1;
-        }
-        return (unsigned PY_LONG_LONG)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to unsigned PY_LONG_LONG");
-                return (unsigned PY_LONG_LONG)-1;
-            }
-            return PyLong_AsUnsignedLongLong(x);
-        } else {
-            return PyLong_AsLongLong(x);
-        }
-    } else {
-        unsigned PY_LONG_LONG val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (unsigned PY_LONG_LONG)-1;
-        val = __Pyx_PyInt_AsUnsignedLongLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject* x) {
-    const long neg_one = (long)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to long");
-            return (long)-1;
-        }
-        return (long)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to long");
-                return (long)-1;
-            }
-            return PyLong_AsUnsignedLong(x);
-        } else {
-            return PyLong_AsLong(x);
-        }
-    } else {
-        long val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (long)-1;
-        val = __Pyx_PyInt_AsLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject* x) {
-    const PY_LONG_LONG neg_one = (PY_LONG_LONG)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to PY_LONG_LONG");
-            return (PY_LONG_LONG)-1;
-        }
-        return (PY_LONG_LONG)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to PY_LONG_LONG");
-                return (PY_LONG_LONG)-1;
-            }
-            return PyLong_AsUnsignedLongLong(x);
-        } else {
-            return PyLong_AsLongLong(x);
-        }
-    } else {
-        PY_LONG_LONG val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (PY_LONG_LONG)-1;
-        val = __Pyx_PyInt_AsLongLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject* x) {
-    const signed long neg_one = (signed long)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to signed long");
-            return (signed long)-1;
-        }
-        return (signed long)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to signed long");
-                return (signed long)-1;
-            }
-            return PyLong_AsUnsignedLong(x);
-        } else {
-            return PyLong_AsLong(x);
-        }
-    } else {
-        signed long val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (signed long)-1;
-        val = __Pyx_PyInt_AsSignedLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject* x) {
-    const signed PY_LONG_LONG neg_one = (signed PY_LONG_LONG)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to signed PY_LONG_LONG");
-            return (signed PY_LONG_LONG)-1;
-        }
-        return (signed PY_LONG_LONG)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to signed PY_LONG_LONG");
-                return (signed PY_LONG_LONG)-1;
-            }
-            return PyLong_AsUnsignedLongLong(x);
-        } else {
-            return PyLong_AsLongLong(x);
-        }
-    } else {
-        signed PY_LONG_LONG val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (signed PY_LONG_LONG)-1;
-        val = __Pyx_PyInt_AsSignedLongLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static void __Pyx_WriteUnraisable(const char *name) {
-    PyObject *old_exc, *old_val, *old_tb;
-    PyObject *ctx;
-    __Pyx_ErrFetch(&old_exc, &old_val, &old_tb);
-    #if PY_MAJOR_VERSION < 3
-    ctx = PyString_FromString(name);
-    #else
-    ctx = PyUnicode_FromString(name);
-    #endif
-    __Pyx_ErrRestore(old_exc, old_val, old_tb);
-    if (!ctx) {
-        PyErr_WriteUnraisable(Py_None);
-    } else {
-        PyErr_WriteUnraisable(ctx);
-        Py_DECREF(ctx);
-    }
-}
-
-static int __Pyx_SetVtable(PyObject *dict, void *vtable) {
-#if PY_VERSION_HEX >= 0x02070000 && !(PY_MAJOR_VERSION==3&&PY_MINOR_VERSION==0)
-    PyObject *ob = PyCapsule_New(vtable, 0, 0);
-#else
-    PyObject *ob = PyCObject_FromVoidPtr(vtable, 0);
-#endif
-    if (!ob)
-        goto bad;
-    if (PyDict_SetItemString(dict, "__pyx_vtable__", ob) < 0)
-        goto bad;
-    Py_DECREF(ob);
-    return 0;
-bad:
-    Py_XDECREF(ob);
-    return -1;
-}
-
-#ifndef __PYX_HAVE_RT_ImportType
-#define __PYX_HAVE_RT_ImportType
-static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name,
-    long size, int strict)
-{
-    PyObject *py_module = 0;
-    PyObject *result = 0;
-    PyObject *py_name = 0;
-    char warning[200];
-
-    py_module = __Pyx_ImportModule(module_name);
-    if (!py_module)
-        goto bad;
-    #if PY_MAJOR_VERSION < 3
-    py_name = PyString_FromString(class_name);
-    #else
-    py_name = PyUnicode_FromString(class_name);
-    #endif
-    if (!py_name)
-        goto bad;
-    result = PyObject_GetAttr(py_module, py_name);
-    Py_DECREF(py_name);
-    py_name = 0;
-    Py_DECREF(py_module);
-    py_module = 0;
-    if (!result)
-        goto bad;
-    if (!PyType_Check(result)) {
-        PyErr_Format(PyExc_TypeError, 
-            "%s.%s is not a type object",
-            module_name, class_name);
-        goto bad;
-    }
-    if (!strict && ((PyTypeObject *)result)->tp_basicsize > size) {
-        PyOS_snprintf(warning, sizeof(warning), 
-            "%s.%s size changed, may indicate binary incompatibility",
-            module_name, class_name);
-        #if PY_VERSION_HEX < 0x02050000
-        PyErr_Warn(NULL, warning);
-        #else
-        PyErr_WarnEx(NULL, warning, 0);
-        #endif
-    }
-    else if (((PyTypeObject *)result)->tp_basicsize != size) {
-        PyErr_Format(PyExc_ValueError, 
-            "%s.%s has the wrong size, try recompiling",
-            module_name, class_name);
-        goto bad;
-    }
-    return (PyTypeObject *)result;
-bad:
-    Py_XDECREF(py_module);
-    Py_XDECREF(result);
-    return 0;
-}
-#endif
-
-#ifndef __PYX_HAVE_RT_ImportModule
-#define __PYX_HAVE_RT_ImportModule
-static PyObject *__Pyx_ImportModule(const char *name) {
-    PyObject *py_name = 0;
-    PyObject *py_module = 0;
-
-    #if PY_MAJOR_VERSION < 3
-    py_name = PyString_FromString(name);
-    #else
-    py_name = PyUnicode_FromString(name);
-    #endif
-    if (!py_name)
-        goto bad;
-    py_module = PyImport_Import(py_name);
-    Py_DECREF(py_name);
-    return py_module;
-bad:
-    Py_XDECREF(py_name);
-    return 0;
-}
-#endif
-
-#include "compile.h"
-#include "frameobject.h"
-#include "traceback.h"
-
-static void __Pyx_AddTraceback(const char *funcname) {
-    PyObject *py_srcfile = 0;
-    PyObject *py_funcname = 0;
-    PyObject *py_globals = 0;
-    PyCodeObject *py_code = 0;
-    PyFrameObject *py_frame = 0;
-
-    #if PY_MAJOR_VERSION < 3
-    py_srcfile = PyString_FromString(__pyx_filename);
-    #else
-    py_srcfile = PyUnicode_FromString(__pyx_filename);
-    #endif
-    if (!py_srcfile) goto bad;
-    if (__pyx_clineno) {
-        #if PY_MAJOR_VERSION < 3
-        py_funcname = PyString_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, __pyx_clineno);
-        #else
-        py_funcname = PyUnicode_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, __pyx_clineno);
-        #endif
-    }
-    else {
-        #if PY_MAJOR_VERSION < 3
-        py_funcname = PyString_FromString(funcname);
-        #else
-        py_funcname = PyUnicode_FromString(funcname);
-        #endif
-    }
-    if (!py_funcname) goto bad;
-    py_globals = PyModule_GetDict(__pyx_m);
-    if (!py_globals) goto bad;
-    py_code = PyCode_New(
-        0,            /*int argcount,*/
-        #if PY_MAJOR_VERSION >= 3
-        0,            /*int kwonlyargcount,*/
-        #endif
-        0,            /*int nlocals,*/
-        0,            /*int stacksize,*/
-        0,            /*int flags,*/
-        __pyx_empty_bytes, /*PyObject *code,*/
-        __pyx_empty_tuple,  /*PyObject *consts,*/
-        __pyx_empty_tuple,  /*PyObject *names,*/
-        __pyx_empty_tuple,  /*PyObject *varnames,*/
-        __pyx_empty_tuple,  /*PyObject *freevars,*/
-        __pyx_empty_tuple,  /*PyObject *cellvars,*/
-        py_srcfile,   /*PyObject *filename,*/
-        py_funcname,  /*PyObject *name,*/
-        __pyx_lineno,   /*int firstlineno,*/
-        __pyx_empty_bytes  /*PyObject *lnotab*/
-    );
-    if (!py_code) goto bad;
-    py_frame = PyFrame_New(
-        PyThreadState_GET(), /*PyThreadState *tstate,*/
-        py_code,             /*PyCodeObject *code,*/
-        py_globals,          /*PyObject *globals,*/
-        0                    /*PyObject *locals*/
-    );
-    if (!py_frame) goto bad;
-    py_frame->f_lineno = __pyx_lineno;
-    PyTraceBack_Here(py_frame);
-bad:
-    Py_XDECREF(py_srcfile);
-    Py_XDECREF(py_funcname);
-    Py_XDECREF(py_code);
-    Py_XDECREF(py_frame);
-}
-
-static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
-    while (t->p) {
-        #if PY_MAJOR_VERSION < 3
-        if (t->is_unicode) {
-            *t->p = PyUnicode_DecodeUTF8(t->s, t->n - 1, NULL);
-        } else if (t->intern) {
-            *t->p = PyString_InternFromString(t->s);
-        } else {
-            *t->p = PyString_FromStringAndSize(t->s, t->n - 1);
-        }
-        #else  /* Python 3+ has unicode identifiers */
-        if (t->is_unicode | t->is_str) {
-            if (t->intern) {
-                *t->p = PyUnicode_InternFromString(t->s);
-            } else if (t->encoding) {
-                *t->p = PyUnicode_Decode(t->s, t->n - 1, t->encoding, NULL);
-            } else {
-                *t->p = PyUnicode_FromStringAndSize(t->s, t->n - 1);
-            }
-        } else {
-            *t->p = PyBytes_FromStringAndSize(t->s, t->n - 1);
-        }
-        #endif
-        if (!*t->p)
-            return -1;
-        ++t;
-    }
-    return 0;
-}
-
-/* Type Conversion Functions */
-
-static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject* x) {
-   int is_true = x == Py_True;
-   if (is_true | (x == Py_False) | (x == Py_None)) return is_true;
-   else return PyObject_IsTrue(x);
-}
-
-static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x) {
-  PyNumberMethods *m;
-  const char *name = NULL;
-  PyObject *res = NULL;
-#if PY_VERSION_HEX < 0x03000000
-  if (PyInt_Check(x) || PyLong_Check(x))
-#else
-  if (PyLong_Check(x))
-#endif
-    return Py_INCREF(x), x;
-  m = Py_TYPE(x)->tp_as_number;
-#if PY_VERSION_HEX < 0x03000000
-  if (m && m->nb_int) {
-    name = "int";
-    res = PyNumber_Int(x);
-  }
-  else if (m && m->nb_long) {
-    name = "long";
-    res = PyNumber_Long(x);
-  }
-#else
-  if (m && m->nb_int) {
-    name = "int";
-    res = PyNumber_Long(x);
-  }
-#endif
-  if (res) {
-#if PY_VERSION_HEX < 0x03000000
-    if (!PyInt_Check(res) && !PyLong_Check(res)) {
-#else
-    if (!PyLong_Check(res)) {
-#endif
-      PyErr_Format(PyExc_TypeError,
-                   "__%s__ returned non-%s (type %.200s)",
-                   name, name, Py_TYPE(res)->tp_name);
-      Py_DECREF(res);
-      return NULL;
-    }
-  }
-  else if (!PyErr_Occurred()) {
-    PyErr_SetString(PyExc_TypeError,
-                    "an integer is required");
-  }
-  return res;
-}
-
-static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject* b) {
-  Py_ssize_t ival;
-  PyObject* x = PyNumber_Index(b);
-  if (!x) return -1;
-  ival = PyInt_AsSsize_t(x);
-  Py_DECREF(x);
-  return ival;
-}
-
-static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t ival) {
-#if PY_VERSION_HEX < 0x02050000
-   if (ival <= LONG_MAX)
-       return PyInt_FromLong((long)ival);
-   else {
-       unsigned char *bytes = (unsigned char *) &ival;
-       int one = 1; int little = (int)*(unsigned char*)&one;
-       return _PyLong_FromByteArray(bytes, sizeof(size_t), little, 0);
-   }
-#else
-   return PyInt_FromSize_t(ival);
-#endif
-}
-
-static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject* x) {
-   unsigned PY_LONG_LONG val = __Pyx_PyInt_AsUnsignedLongLong(x);
-   if (unlikely(val == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())) {
-       return (size_t)-1;
-   } else if (unlikely(val != (unsigned PY_LONG_LONG)(size_t)val)) {
-       PyErr_SetString(PyExc_OverflowError,
-                       "value too large to convert to size_t");
-       return (size_t)-1;
-   }
-   return (size_t)val;
-}
-
-
-#endif /* Py_PYTHON_H */
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/amr_utils.pyx
--- a/yt/amr_utils.pyx	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,47 +0,0 @@
-"""
-Container file to hold all our Cython routines.  This is to avoid problems with
-static linking.
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-#cython embedsignature=True
-#cython cdivision=True
-#cython always_allow_keywords=True
-
-# Set up some imports
-import numpy as np
-cimport numpy as np
-cimport cython
-
-# We include all of our files
-
-include "_amr_utils/DepthFirstOctree.pyx"
-include "_amr_utils/Interpolators.pyx"
-include "_amr_utils/PointsInVolume.pyx"
-include "_amr_utils/RayIntegrators.pyx"
-include "_amr_utils/VolumeIntegrator.pyx"
-include "_amr_utils/CICDeposit.pyx"
-include "_amr_utils/ContourFinding.pyx"
-include "_amr_utils/png_writer.pyx"
-include "_amr_utils/fortran_reader.pyx"
-include "_amr_utils/QuadTree.pyx"
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/data_objects/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/data_objects/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('data_objects',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/exceptions.py
--- a/yt/exceptions.py	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,43 +0,0 @@
-"""
-This is a library of yt-defined exceptions
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2009 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-# We don't need to import 'exceptions'
-#import exceptions
-
-class YTException(Exception):
-    def __init__(self, pf = None):
-        Exception.__init__(self)
-        self.pf = pf
-
-# Data access exceptions:
-
-class YTSphereTooSmall(YTException):
-    def __init__(self, pf, radius, smallest_cell):
-        YTException.__init__(self, pf)
-        self.radius = radius
-        self.smallest_cell = smallest_cell
-
-    def __str__(self):
-        return "%0.5e < %0.5e" % (self.radius, self.smallest_cell)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/frontends/chombo/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/frontends/chombo/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('chombo',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/frontends/enzo/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/frontends/enzo/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('enzo',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/frontends/flash/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/frontends/flash/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('flash',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/frontends/gadget/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/frontends/gadget/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('gadget',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/frontends/orion/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/frontends/orion/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('orion',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/frontends/ramses/ramses_reader.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/frontends/ramses/ramses_reader.cpp	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,11701 @@
+/* Generated by Cython 0.13.beta0 on Tue Aug 10 15:34:03 2010 */
+
+#define PY_SSIZE_T_CLEAN
+#include "Python.h"
+#ifndef Py_PYTHON_H
+    #error Python headers needed to compile C extensions, please install development version of Python.
+#else
+
+#include <stddef.h> /* For offsetof */
+#ifndef offsetof
+#define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
+#endif
+
+#if !defined(WIN32) && !defined(MS_WINDOWS)
+  #ifndef __stdcall
+    #define __stdcall
+  #endif
+  #ifndef __cdecl
+    #define __cdecl
+  #endif
+  #ifndef __fastcall
+    #define __fastcall
+  #endif
+#endif
+
+#ifndef DL_IMPORT
+  #define DL_IMPORT(t) t
+#endif
+#ifndef DL_EXPORT
+  #define DL_EXPORT(t) t
+#endif
+
+#ifndef PY_LONG_LONG
+  #define PY_LONG_LONG LONG_LONG
+#endif
+
+#if PY_VERSION_HEX < 0x02040000
+  #define METH_COEXIST 0
+  #define PyDict_CheckExact(op) (Py_TYPE(op) == &PyDict_Type)
+  #define PyDict_Contains(d,o)   PySequence_Contains(d,o)
+#endif
+
+#if PY_VERSION_HEX < 0x02050000
+  typedef int Py_ssize_t;
+  #define PY_SSIZE_T_MAX INT_MAX
+  #define PY_SSIZE_T_MIN INT_MIN
+  #define PY_FORMAT_SIZE_T ""
+  #define PyInt_FromSsize_t(z) PyInt_FromLong(z)
+  #define PyInt_AsSsize_t(o)   PyInt_AsLong(o)
+  #define PyNumber_Index(o)    PyNumber_Int(o)
+  #define PyIndex_Check(o)     PyNumber_Check(o)
+  #define PyErr_WarnEx(category, message, stacklevel) PyErr_Warn(category, message)
+#endif
+
+#if PY_VERSION_HEX < 0x02060000
+  #define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
+  #define Py_TYPE(ob)   (((PyObject*)(ob))->ob_type)
+  #define Py_SIZE(ob)   (((PyVarObject*)(ob))->ob_size)
+  #define PyVarObject_HEAD_INIT(type, size) \
+          PyObject_HEAD_INIT(type) size,
+  #define PyType_Modified(t)
+
+  typedef struct {
+     void *buf;
+     PyObject *obj;
+     Py_ssize_t len;
+     Py_ssize_t itemsize;
+     int readonly;
+     int ndim;
+     char *format;
+     Py_ssize_t *shape;
+     Py_ssize_t *strides;
+     Py_ssize_t *suboffsets;
+     void *internal;
+  } Py_buffer;
+
+  #define PyBUF_SIMPLE 0
+  #define PyBUF_WRITABLE 0x0001
+  #define PyBUF_FORMAT 0x0004
+  #define PyBUF_ND 0x0008
+  #define PyBUF_STRIDES (0x0010 | PyBUF_ND)
+  #define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
+  #define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
+  #define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
+  #define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
+
+#endif
+
+#if PY_MAJOR_VERSION < 3
+  #define __Pyx_BUILTIN_MODULE_NAME "__builtin__"
+#else
+  #define __Pyx_BUILTIN_MODULE_NAME "builtins"
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define Py_TPFLAGS_CHECKTYPES 0
+  #define Py_TPFLAGS_HAVE_INDEX 0
+#endif
+
+#if (PY_VERSION_HEX < 0x02060000) || (PY_MAJOR_VERSION >= 3)
+  #define Py_TPFLAGS_HAVE_NEWBUFFER 0
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define PyBaseString_Type            PyUnicode_Type
+  #define PyStringObject               PyUnicodeObject
+  #define PyString_Type                PyUnicode_Type
+  #define PyString_Check               PyUnicode_Check
+  #define PyString_CheckExact          PyUnicode_CheckExact
+#endif
+
+#if PY_VERSION_HEX < 0x02060000
+  #define PyBytesObject                PyStringObject
+  #define PyBytes_Type                 PyString_Type
+  #define PyBytes_Check                PyString_Check
+  #define PyBytes_CheckExact           PyString_CheckExact
+  #define PyBytes_FromString           PyString_FromString
+  #define PyBytes_FromStringAndSize    PyString_FromStringAndSize
+  #define PyBytes_FromFormat           PyString_FromFormat
+  #define PyBytes_DecodeEscape         PyString_DecodeEscape
+  #define PyBytes_AsString             PyString_AsString
+  #define PyBytes_AsStringAndSize      PyString_AsStringAndSize
+  #define PyBytes_Size                 PyString_Size
+  #define PyBytes_AS_STRING            PyString_AS_STRING
+  #define PyBytes_GET_SIZE             PyString_GET_SIZE
+  #define PyBytes_Repr                 PyString_Repr
+  #define PyBytes_Concat               PyString_Concat
+  #define PyBytes_ConcatAndDel         PyString_ConcatAndDel
+  #define PySet_Check(obj)             PyObject_TypeCheck(obj, &PySet_Type)
+  #define PyFrozenSet_Check(obj)       PyObject_TypeCheck(obj, &PyFrozenSet_Type)
+#endif
+
+#ifndef PySet_CheckExact
+#  define PySet_CheckExact(obj)          (Py_TYPE(obj) == &PySet_Type)
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define PyInt_Type                   PyLong_Type
+  #define PyInt_Check(op)              PyLong_Check(op)
+  #define PyInt_CheckExact(op)         PyLong_CheckExact(op)
+  #define PyInt_FromString             PyLong_FromString
+  #define PyInt_FromUnicode            PyLong_FromUnicode
+  #define PyInt_FromLong               PyLong_FromLong
+  #define PyInt_FromSize_t             PyLong_FromSize_t
+  #define PyInt_FromSsize_t            PyLong_FromSsize_t
+  #define PyInt_AsLong                 PyLong_AsLong
+  #define PyInt_AS_LONG                PyLong_AS_LONG
+  #define PyInt_AsSsize_t              PyLong_AsSsize_t
+  #define PyInt_AsUnsignedLongMask     PyLong_AsUnsignedLongMask
+  #define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_TrueDivide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceTrueDivide(x,y)
+#else
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_Divide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceDivide(x,y)
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define PyMethod_New(func, self, klass) ((self) ? PyMethod_New(func, self) : PyInstanceMethod_New(func))
+#endif
+
+#if PY_VERSION_HEX < 0x02050000
+  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),((char *)(n)))
+  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),((char *)(n)),(a))
+  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),((char *)(n)))
+#else
+  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),(n))
+  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),(n),(a))
+  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),(n))
+#endif
+
+#if PY_VERSION_HEX < 0x02050000
+  #define __Pyx_NAMESTR(n) ((char *)(n))
+  #define __Pyx_DOCSTR(n)  ((char *)(n))
+#else
+  #define __Pyx_NAMESTR(n) (n)
+  #define __Pyx_DOCSTR(n)  (n)
+#endif
+
+#ifdef __cplusplus
+#define __PYX_EXTERN_C extern "C"
+#else
+#define __PYX_EXTERN_C extern
+#endif
+
+#if defined(WIN32) || defined(MS_WINDOWS)
+#define _USE_MATH_DEFINES
+#endif
+#include <math.h>
+#define __PYX_HAVE_API__yt__ramses_reader
+#include "stdlib.h"
+#include "stdio.h"
+#include "numpy/arrayobject.h"
+#include "numpy/ufuncobject.h"
+#include <vector>
+#include <map>
+#include "string"
+#include "RAMSES_typedefs.h"
+#include "RAMSES_info.hh"
+#include "RAMSES_amr_data.hh"
+
+/* inline attribute */
+#ifndef CYTHON_INLINE
+  #if defined(__GNUC__)
+    #define CYTHON_INLINE __inline__
+  #elif defined(_MSC_VER)
+    #define CYTHON_INLINE __inline
+  #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+    #define CYTHON_INLINE inline
+  #else
+    #define CYTHON_INLINE 
+  #endif
+#endif
+
+/* unused attribute */
+#ifndef CYTHON_UNUSED
+# if defined(__GNUC__)
+#   if !(defined(__cplusplus)) || (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+#     define CYTHON_UNUSED __attribute__ ((__unused__)) 
+#   else
+#     define CYTHON_UNUSED
+#   endif
+# elif defined(__ICC) || defined(__INTEL_COMPILER)
+#   define CYTHON_UNUSED __attribute__ ((__unused__)) 
+# else
+#   define CYTHON_UNUSED 
+# endif
+#endif
+
+typedef struct {PyObject **p; char *s; const long n; const char* encoding; const char is_unicode; const char is_str; const char intern; } __Pyx_StringTabEntry; /*proto*/
+
+
+/* Type Conversion Predeclarations */
+
+#define __Pyx_PyBytes_FromUString(s) PyBytes_FromString((char*)s)
+#define __Pyx_PyBytes_AsUString(s)   ((unsigned char*) PyBytes_AsString(s))
+
+#define __Pyx_PyBool_FromLong(b) ((b) ? (Py_INCREF(Py_True), Py_True) : (Py_INCREF(Py_False), Py_False))
+static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject*);
+static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x);
+
+static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject*);
+static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t);
+static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject*);
+
+#define __pyx_PyFloat_AsDouble(x) (PyFloat_CheckExact(x) ? PyFloat_AS_DOUBLE(x) : PyFloat_AsDouble(x))
+
+
+#ifdef __GNUC__
+/* Test for GCC > 2.95 */
+#if __GNUC__ > 2 || (__GNUC__ == 2 && (__GNUC_MINOR__ > 95)) 
+#define likely(x)   __builtin_expect(!!(x), 1)
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#else /* __GNUC__ > 2 ... */
+#define likely(x)   (x)
+#define unlikely(x) (x)
+#endif /* __GNUC__ > 2 ... */
+#else /* __GNUC__ */
+#define likely(x)   (x)
+#define unlikely(x) (x)
+#endif /* __GNUC__ */
+    
+static PyObject *__pyx_m;
+static PyObject *__pyx_b;
+static PyObject *__pyx_empty_tuple;
+static PyObject *__pyx_empty_bytes;
+static int __pyx_lineno;
+static int __pyx_clineno = 0;
+static const char * __pyx_cfilenm= __FILE__;
+static const char *__pyx_filename;
+
+
+#if !defined(CYTHON_CCOMPLEX)
+  #if defined(__cplusplus)
+    #define CYTHON_CCOMPLEX 1
+  #elif defined(_Complex_I)
+    #define CYTHON_CCOMPLEX 1
+  #else
+    #define CYTHON_CCOMPLEX 0
+  #endif
+#endif
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    #include <complex>
+  #else
+    #include <complex.h>
+  #endif
+#endif
+
+#if CYTHON_CCOMPLEX && !defined(__cplusplus) && defined(__sun__) && defined(__GNUC__)
+  #undef _Complex_I
+  #define _Complex_I 1.0fj
+#endif
+
+static const char *__pyx_f[] = {
+  "ramses_reader.pyx",
+  "numpy.pxd",
+};
+
+typedef npy_int8 __pyx_t_5numpy_int8_t;
+
+typedef npy_int16 __pyx_t_5numpy_int16_t;
+
+typedef npy_int32 __pyx_t_5numpy_int32_t;
+
+typedef npy_int64 __pyx_t_5numpy_int64_t;
+
+typedef npy_uint8 __pyx_t_5numpy_uint8_t;
+
+typedef npy_uint16 __pyx_t_5numpy_uint16_t;
+
+typedef npy_uint32 __pyx_t_5numpy_uint32_t;
+
+typedef npy_uint64 __pyx_t_5numpy_uint64_t;
+
+typedef npy_float32 __pyx_t_5numpy_float32_t;
+
+typedef npy_float64 __pyx_t_5numpy_float64_t;
+
+typedef npy_long __pyx_t_5numpy_int_t;
+
+typedef npy_longlong __pyx_t_5numpy_long_t;
+
+typedef npy_intp __pyx_t_5numpy_intp_t;
+
+typedef npy_uintp __pyx_t_5numpy_uintp_t;
+
+typedef npy_ulong __pyx_t_5numpy_uint_t;
+
+typedef npy_ulonglong __pyx_t_5numpy_ulong_t;
+
+typedef npy_double __pyx_t_5numpy_float_t;
+
+typedef npy_double __pyx_t_5numpy_double_t;
+
+typedef npy_longdouble __pyx_t_5numpy_longdouble_t;
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    typedef ::std::complex< float > __pyx_t_float_complex;
+  #else
+    typedef float _Complex __pyx_t_float_complex;
+  #endif
+#else
+    typedef struct { float real, imag; } __pyx_t_float_complex;
+#endif
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    typedef ::std::complex< double > __pyx_t_double_complex;
+  #else
+    typedef double _Complex __pyx_t_double_complex;
+  #endif
+#else
+    typedef struct { double real, imag; } __pyx_t_double_complex;
+#endif
+
+/* Type declarations */
+
+typedef npy_cfloat __pyx_t_5numpy_cfloat_t;
+
+typedef npy_cdouble __pyx_t_5numpy_cdouble_t;
+
+typedef npy_clongdouble __pyx_t_5numpy_clongdouble_t;
+
+typedef npy_cdouble __pyx_t_5numpy_complex_t;
+
+/* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":370
+ *         vector[vector[double]] m_var_array
+ * 
+ * cdef class RAMSES_tree_proxy:             # <<<<<<<<<<<<<<
+ *     cdef string *snapshot_name
+ *     cdef snapshot *rsnap
+ */
+
+struct __pyx_obj_2yt_13ramses_reader_RAMSES_tree_proxy {
+  PyObject_HEAD
+  std::string *snapshot_name;
+  RAMSES::snapshot *rsnap;
+  RAMSES::AMR::RAMSES_tree **trees;
+  RAMSES::HYDRO::RAMSES_hydro_data ***hydro_datas;
+  int *loaded;
+  PyObject *field_ind;
+  PyObject *field_names;
+  int ndomains;
+  int nfields;
+};
+
+/* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":659
+ *         return to_fill
+ * 
+ * cdef class ProtoSubgrid:             # <<<<<<<<<<<<<<
+ *     cdef np.int64_t *signature[3]
+ *     cdef np.int64_t left_edge[3]
+ */
+
+struct __pyx_obj_2yt_13ramses_reader_ProtoSubgrid {
+  PyObject_HEAD
+  __pyx_t_5numpy_int64_t *signature[3];
+  __pyx_t_5numpy_int64_t left_edge[3];
+  __pyx_t_5numpy_int64_t right_edge[3];
+  __pyx_t_5numpy_int64_t dimensions[3];
+  __pyx_t_5numpy_float64_t efficiency;
+  PyObject *sigs;
+  PyObject *grid_file_locations;
+  PyObject *dd;
+};
+
+#ifndef CYTHON_REFNANNY
+  #define CYTHON_REFNANNY 0
+#endif
+
+#if CYTHON_REFNANNY
+  typedef struct {
+    void (*INCREF)(void*, PyObject*, int);
+    void (*DECREF)(void*, PyObject*, int);
+    void (*GOTREF)(void*, PyObject*, int);
+    void (*GIVEREF)(void*, PyObject*, int);
+    void* (*SetupContext)(const char*, int, const char*);
+    void (*FinishContext)(void**);
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+  #define __Pyx_RefNannyFinishContext()
+  #define __Pyx_INCREF(r) Py_INCREF(r)
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+  #define __Pyx_GOTREF(r)
+  #define __Pyx_GIVEREF(r)
+  #define __Pyx_XDECREF(r) Py_XDECREF(r)
+#endif /* CYTHON_REFNANNY */
+#define __Pyx_XGIVEREF(r) do { if((r) != NULL) {__Pyx_GIVEREF(r);} } while(0)
+#define __Pyx_XGOTREF(r) do { if((r) != NULL) {__Pyx_GOTREF(r);} } while(0)
+
+static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name); /*proto*/
+
+static void __Pyx_RaiseDoubleKeywordsError(
+    const char* func_name, PyObject* kw_name); /*proto*/
+
+static void __Pyx_RaiseArgtupleInvalid(const char* func_name, int exact,
+    Py_ssize_t num_min, Py_ssize_t num_max, Py_ssize_t num_found); /*proto*/
+
+static int __Pyx_ParseOptionalKeywords(PyObject *kwds, PyObject **argnames[],     PyObject *kwds2, PyObject *values[], Py_ssize_t num_pos_args,     const char* function_name); /*proto*/
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_Append(PyObject* L, PyObject* x) {
+    if (likely(PyList_CheckExact(L))) {
+        if (PyList_Append(L, x) < 0) return NULL;
+        Py_INCREF(Py_None);
+        return Py_None; /* this is just to have an accurate signature */
+    }
+    else {
+        PyObject *r, *m;
+        m = __Pyx_GetAttrString(L, "append");
+        if (!m) return NULL;
+        r = PyObject_CallFunctionObjArgs(m, x, NULL);
+        Py_DECREF(m);
+        return r;
+    }
+}
+
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Generic(PyObject *o, PyObject* j) {
+    PyObject *r;
+    if (!j) return NULL;
+    r = PyObject_GetItem(o, j);
+    Py_DECREF(j);
+    return r;
+}
+
+
+#define __Pyx_GetItemInt_List(o, i, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
+                                                    __Pyx_GetItemInt_List_Fast(o, i) : \
+                                                    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_List_Fast(PyObject *o, Py_ssize_t i) {
+    if (likely(o != Py_None)) {
+        if (likely((0 <= i) & (i < PyList_GET_SIZE(o)))) {
+            PyObject *r = PyList_GET_ITEM(o, i);
+            Py_INCREF(r);
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+            PyObject *r = PyList_GET_ITEM(o, PyList_GET_SIZE(o) + i);
+            Py_INCREF(r);
+            return r;
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+    }
+    return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
+}
+
+#define __Pyx_GetItemInt_Tuple(o, i, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
+                                                    __Pyx_GetItemInt_Tuple_Fast(o, i) : \
+                                                    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Tuple_Fast(PyObject *o, Py_ssize_t i) {
+    if (likely(o != Py_None)) {
+        if (likely((0 <= i) & (i < PyTuple_GET_SIZE(o)))) {
+            PyObject *r = PyTuple_GET_ITEM(o, i);
+            Py_INCREF(r);
+            return r;
+        }
+        else if ((-PyTuple_GET_SIZE(o) <= i) & (i < 0)) {
+            PyObject *r = PyTuple_GET_ITEM(o, PyTuple_GET_SIZE(o) + i);
+            Py_INCREF(r);
+            return r;
+        }
+    }
+    return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
+}
+
+
+#define __Pyx_GetItemInt(o, i, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
+                                                    __Pyx_GetItemInt_Fast(o, i) : \
+                                                    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Fast(PyObject *o, Py_ssize_t i) {
+    PyObject *r;
+    if (PyList_CheckExact(o) && ((0 <= i) & (i < PyList_GET_SIZE(o)))) {
+        r = PyList_GET_ITEM(o, i);
+        Py_INCREF(r);
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+    else if (PyTuple_CheckExact(o) && ((0 <= i) & (i < PyTuple_GET_SIZE(o)))) {
+        r = PyTuple_GET_ITEM(o, i);
+        Py_INCREF(r);
+    }
+    else if (Py_TYPE(o)->tp_as_sequence && Py_TYPE(o)->tp_as_sequence->sq_item && (likely(i >= 0))) {
+        r = PySequence_GetItem(o, i);
+    }
+    else {
+        r = __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
+    }
+    return r;
+}
+
+#define __Pyx_SetItemInt(o, i, v, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
+                                                    __Pyx_SetItemInt_Fast(o, i, v) : \
+                                                    __Pyx_SetItemInt_Generic(o, to_py_func(i), v))
+
+static CYTHON_INLINE int __Pyx_SetItemInt_Generic(PyObject *o, PyObject *j, PyObject *v) {
+    int r;
+    if (!j) return -1;
+    r = PyObject_SetItem(o, j, v);
+    Py_DECREF(j);
+    return r;
+}
+
+static CYTHON_INLINE int __Pyx_SetItemInt_Fast(PyObject *o, Py_ssize_t i, PyObject *v) {
+    if (PyList_CheckExact(o) && ((0 <= i) & (i < PyList_GET_SIZE(o)))) {
+        Py_INCREF(v);
+        Py_DECREF(PyList_GET_ITEM(o, i));
+        PyList_SET_ITEM(o, i, v);
+        return 1;
+    }
+    else if (Py_TYPE(o)->tp_as_sequence && Py_TYPE(o)->tp_as_sequence->sq_ass_item && (likely(i >= 0)))
+        return PySequence_SetItem(o, i, v);
+    else {
+        PyObject *j = PyInt_FromSsize_t(i);
+        return __Pyx_SetItemInt_Generic(o, j, v);
+    }
+}
+
+static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
+    const char *name, int exact); /*proto*/
+
+/* Run-time type information about structs used with buffers */
+struct __Pyx_StructField_;
+
+typedef struct {
+  const char* name; /* for error messages only */
+  struct __Pyx_StructField_* fields;
+  size_t size;     /* sizeof(type) */
+  char typegroup; /* _R_eal, _C_omplex, Signed _I_nt, _U_nsigned int, _S_truct, _P_ointer, _O_bject */
+} __Pyx_TypeInfo;
+
+typedef struct __Pyx_StructField_ {
+  __Pyx_TypeInfo* type;
+  const char* name;
+  size_t offset;
+} __Pyx_StructField;
+
+typedef struct {
+  __Pyx_StructField* field;
+  size_t parent_offset;
+} __Pyx_BufFmt_StackElem;
+
+
+static CYTHON_INLINE int  __Pyx_GetBufferAndValidate(Py_buffer* buf, PyObject* obj, __Pyx_TypeInfo* dtype, int flags, int nd, int cast, __Pyx_BufFmt_StackElem* stack);
+static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info);
+static void __Pyx_RaiseBufferIndexError(int axis); /*proto*/
+#define __Pyx_BufPtrStrided2d(type, buf, i0, s0, i1, s1) (type)((char*)buf + i0 * s0 + i1 * s1)
+
+static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
+static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type); /*proto*/
+#define __Pyx_BufPtrStrided1d(type, buf, i0, s0) (type)((char*)buf + i0 * s0)
+
+static void __Pyx_RaiseBufferFallbackError(void); /*proto*/
+
+static CYTHON_INLINE int __Pyx_div_int(int, int); /* proto */
+
+#define UNARY_NEG_WOULD_OVERFLOW(x)		(((x) < 0) & ((unsigned long)(x) == 0-(unsigned long)(x)))
+#define __Pyx_BufPtrStrided3d(type, buf, i0, s0, i1, s1, i2, s2) (type)((char*)buf + i0 * s0 + i1 * s1 + i2 * s2)
+
+static CYTHON_INLINE __pyx_t_5numpy_int64_t __Pyx_div___pyx_t_5numpy_int64_t(__pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t); /* proto */
+
+static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void);
+
+static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index);
+
+static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected);
+
+static void __Pyx_UnpackTupleError(PyObject *, Py_ssize_t index); /*proto*/
+#if PY_MAJOR_VERSION < 3
+static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags);
+static void __Pyx_ReleaseBuffer(Py_buffer *view);
+#else
+#define __Pyx_GetBuffer PyObject_GetBuffer
+#define __Pyx_ReleaseBuffer PyBuffer_Release
+#endif
+
+Py_ssize_t __Pyx_zeros[] = {0, 0, 0};
+Py_ssize_t __Pyx_minusones[] = {-1, -1, -1};
+
+static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list); /*proto*/
+
+static int __Pyx_Print(PyObject*, PyObject *, int); /*proto*/
+#if PY_MAJOR_VERSION >= 3
+static PyObject* __pyx_print = 0;
+static PyObject* __pyx_print_kwargs = 0;
+#endif
+
+static CYTHON_INLINE long __Pyx_pow_long(long, long); /* proto */
+
+static CYTHON_INLINE npy_int64 __Pyx_PyInt_from_py_npy_int64(PyObject *);
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int64(npy_int64);
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    #define __Pyx_CREAL(z) ((z).real())
+    #define __Pyx_CIMAG(z) ((z).imag())
+  #else
+    #define __Pyx_CREAL(z) (__real__(z))
+    #define __Pyx_CIMAG(z) (__imag__(z))
+  #endif
+#else
+    #define __Pyx_CREAL(z) ((z).real)
+    #define __Pyx_CIMAG(z) ((z).imag)
+#endif
+
+#if defined(_WIN32) && defined(__cplusplus) && CYTHON_CCOMPLEX
+    #define __Pyx_SET_CREAL(z,x) ((z).real(x))
+    #define __Pyx_SET_CIMAG(z,y) ((z).imag(y))
+#else
+    #define __Pyx_SET_CREAL(z,x) __Pyx_CREAL(z) = (x)
+    #define __Pyx_SET_CIMAG(z,y) __Pyx_CIMAG(z) = (y)
+#endif
+
+static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float, float);
+
+#if CYTHON_CCOMPLEX
+    #define __Pyx_c_eqf(a, b)   ((a)==(b))
+    #define __Pyx_c_sumf(a, b)  ((a)+(b))
+    #define __Pyx_c_difff(a, b) ((a)-(b))
+    #define __Pyx_c_prodf(a, b) ((a)*(b))
+    #define __Pyx_c_quotf(a, b) ((a)/(b))
+    #define __Pyx_c_negf(a)     (-(a))
+  #ifdef __cplusplus
+    #define __Pyx_c_is_zerof(z) ((z)==(float)0)
+    #define __Pyx_c_conjf(z)    (::std::conj(z))
+    /*#define __Pyx_c_absf(z)     (::std::abs(z))*/
+  #else
+    #define __Pyx_c_is_zerof(z) ((z)==0)
+    #define __Pyx_c_conjf(z)    (conjf(z))
+    /*#define __Pyx_c_absf(z)     (cabsf(z))*/
+ #endif
+#else
+    static CYTHON_INLINE int __Pyx_c_eqf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_sumf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_difff(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_prodf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_quotf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_negf(__pyx_t_float_complex);
+    static CYTHON_INLINE int __Pyx_c_is_zerof(__pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_conjf(__pyx_t_float_complex);
+    /*static CYTHON_INLINE float __Pyx_c_absf(__pyx_t_float_complex);*/
+#endif
+
+static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double, double);
+
+#if CYTHON_CCOMPLEX
+    #define __Pyx_c_eq(a, b)   ((a)==(b))
+    #define __Pyx_c_sum(a, b)  ((a)+(b))
+    #define __Pyx_c_diff(a, b) ((a)-(b))
+    #define __Pyx_c_prod(a, b) ((a)*(b))
+    #define __Pyx_c_quot(a, b) ((a)/(b))
+    #define __Pyx_c_neg(a)     (-(a))
+  #ifdef __cplusplus
+    #define __Pyx_c_is_zero(z) ((z)==(double)0)
+    #define __Pyx_c_conj(z)    (::std::conj(z))
+    /*#define __Pyx_c_abs(z)     (::std::abs(z))*/
+  #else
+    #define __Pyx_c_is_zero(z) ((z)==0)
+    #define __Pyx_c_conj(z)    (conj(z))
+    /*#define __Pyx_c_abs(z)     (cabs(z))*/
+ #endif
+#else
+    static CYTHON_INLINE int __Pyx_c_eq(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_sum(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_diff(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_prod(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_quot(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_neg(__pyx_t_double_complex);
+    static CYTHON_INLINE int __Pyx_c_is_zero(__pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_conj(__pyx_t_double_complex);
+    /*static CYTHON_INLINE double __Pyx_c_abs(__pyx_t_double_complex);*/
+#endif
+
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
+
+static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject *);
+
+static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject *);
+
+static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject *);
+
+static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject *);
+
+static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject *);
+
+static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject *);
+
+static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject *);
+
+static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject *);
+
+static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject *);
+
+static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject *);
+
+static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject *);
+
+static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject *);
+
+static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject *);
+
+static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject *);
+
+static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject *);
+
+static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject *);
+
+static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name, long size, int strict);  /*proto*/
+
+static PyObject *__Pyx_ImportModule(const char *name); /*proto*/
+
+static void __Pyx_AddTraceback(const char *funcname); /*proto*/
+
+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
+/* Module declarations from libc.stdlib */
+
+/* Module declarations from cpython.buffer */
+
+/* Module declarations from cpython.ref */
+
+/* Module declarations from libc.stdio */
+
+/* Module declarations from cpython.object */
+
+/* Module declarations from numpy */
+
+/* Module declarations from numpy */
+
+static PyTypeObject *__pyx_ptype_5numpy_dtype = 0;
+static PyTypeObject *__pyx_ptype_5numpy_flatiter = 0;
+static PyTypeObject *__pyx_ptype_5numpy_broadcast = 0;
+static PyTypeObject *__pyx_ptype_5numpy_ndarray = 0;
+static PyTypeObject *__pyx_ptype_5numpy_ufunc = 0;
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew1(PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew2(PyObject *, PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew3(PyObject *, PyObject *, PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew4(PyObject *, PyObject *, PyObject *, PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew5(PyObject *, PyObject *, PyObject *, PyObject *, PyObject *); /*proto*/
+static CYTHON_INLINE char *__pyx_f_5numpy__util_dtypestring(PyArray_Descr *, char *, char *, int *); /*proto*/
+static CYTHON_INLINE void __pyx_f_5numpy_set_array_base(PyArrayObject *, PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_get_array_base(PyArrayObject *); /*proto*/
+/* Module declarations from cython */
+
+/* Module declarations from yt.ramses_reader */
+
+static PyTypeObject *__pyx_ptype_2yt_13ramses_reader_RAMSES_tree_proxy = 0;
+static PyTypeObject *__pyx_ptype_2yt_13ramses_reader_ProtoSubgrid = 0;
+static CYTHON_INLINE __pyx_t_5numpy_int64_t __pyx_f_2yt_13ramses_reader_i64max(__pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t); /*proto*/
+static CYTHON_INLINE __pyx_t_5numpy_int64_t __pyx_f_2yt_13ramses_reader_i64min(__pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t); /*proto*/
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t = { "float64_t", NULL, sizeof(__pyx_t_5numpy_float64_t), 'R' };
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int32_t = { "int32_t", NULL, sizeof(__pyx_t_5numpy_int32_t), 'I' };
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int64_t = { "int64_t", NULL, sizeof(__pyx_t_5numpy_int64_t), 'I' };
+#define __Pyx_MODULE_NAME "yt.ramses_reader"
+int __pyx_module_is_main_yt__ramses_reader = 0;
+
+/* Implementation of yt.ramses_reader */
+static PyObject *__pyx_builtin_range;
+static PyObject *__pyx_builtin_ValueError;
+static PyObject *__pyx_builtin_RuntimeError;
+static char __pyx_k_1[] = "READING FROM DISK";
+static char __pyx_k_2[] = "get_absolute_position";
+static char __pyx_k_3[] = "ndarray is not C contiguous";
+static char __pyx_k_4[] = "ndarray is not Fortran contiguous";
+static char __pyx_k_5[] = "Non-native byte order not supported";
+static char __pyx_k_6[] = "unknown dtype code in numpy.pxd (%d)";
+static char __pyx_k_7[] = "Format string allocated too short, see comment in numpy.pxd";
+static char __pyx_k_8[] = "Format string allocated too short.";
+static char __pyx_k_9[] = "\nWrapping code for Oliver Hahn's RamsesRead++\n\nAuthor: Matthew Turk <matthewturk@gmail.com>\nAffiliation: UCSD\nAuthor: Oliver Hahn <ohahn@stanford.edu>\nAffiliation: KIPAC / Stanford\nHomepage: http://yt.enzotools.org/\nLicense:\n  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.\n\n  This file is part of yt.\n\n  yt is free software; you can redistribute it and/or modify\n  it under the terms of the GNU General Public License as published by\n  the Free Software Foundation; either version 3 of the License, or\n  (at your option) any later version.\n\n  This program is distributed in the hope that it will be useful,\n  but WITHOUT ANY WARRANTY; without even the implied warranty of\n  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n  GNU General Public License for more details.\n\n  You should have received a copy of the GNU General Public License\n  along with this program.  If not, see <http://www.gnu.org/licenses/>.\n";
+static char __pyx_k__B[] = "B";
+static char __pyx_k__F[] = "F";
+static char __pyx_k__H[] = "H";
+static char __pyx_k__I[] = "I";
+static char __pyx_k__L[] = "L";
+static char __pyx_k__O[] = "O";
+static char __pyx_k__Q[] = "Q";
+static char __pyx_k__b[] = "b";
+static char __pyx_k__d[] = "d";
+static char __pyx_k__f[] = "f";
+static char __pyx_k__g[] = "g";
+static char __pyx_k__h[] = "h";
+static char __pyx_k__i[] = "i";
+static char __pyx_k__l[] = "l";
+static char __pyx_k__q[] = "q";
+static char __pyx_k__x[] = "x";
+static char __pyx_k__y[] = "y";
+static char __pyx_k__z[] = "z";
+static char __pyx_k__H0[] = "H0";
+static char __pyx_k__Zd[] = "Zd";
+static char __pyx_k__Zf[] = "Zf";
+static char __pyx_k__Zg[] = "Zg";
+static char __pyx_k__dd[] = "dd";
+static char __pyx_k__fn[] = "fn";
+static char __pyx_k__np[] = "np";
+static char __pyx_k__zc[] = "zc";
+static char __pyx_k__zs[] = "zs";
+static char __pyx_k__buf[] = "buf";
+static char __pyx_k__end[] = "end";
+static char __pyx_k__obj[] = "obj";
+static char __pyx_k__aexp[] = "aexp";
+static char __pyx_k__base[] = "base";
+static char __pyx_k__data[] = "data";
+static char __pyx_k__ncpu[] = "ncpu";
+static char __pyx_k__ndim[] = "ndim";
+static char __pyx_k__next[] = "next";
+static char __pyx_k__ones[] = "ones";
+static char __pyx_k__read[] = "read";
+static char __pyx_k__sigs[] = "sigs";
+static char __pyx_k__size[] = "size";
+static char __pyx_k__time[] = "time";
+static char __pyx_k__begin[] = "begin";
+static char __pyx_k__c_str[] = "c_str";
+static char __pyx_k__descr[] = "descr";
+static char __pyx_k__dtype[] = "dtype";
+static char __pyx_k__empty[] = "empty";
+static char __pyx_k__field[] = "field";
+static char __pyx_k__int64[] = "int64";
+static char __pyx_k__level[] = "level";
+static char __pyx_k__names[] = "names";
+static char __pyx_k__numpy[] = "numpy";
+static char __pyx_k__order[] = "order";
+static char __pyx_k__range[] = "range";
+static char __pyx_k__rsnap[] = "rsnap";
+static char __pyx_k__shape[] = "shape";
+static char __pyx_k__trees[] = "trees";
+static char __pyx_k__zeros[] = "zeros";
+static char __pyx_k__boxlen[] = "boxlen";
+static char __pyx_k__domain[] = "domain";
+static char __pyx_k__fields[] = "fields";
+static char __pyx_k__filled[] = "filled";
+static char __pyx_k__format[] = "format";
+static char __pyx_k__loaded[] = "loaded";
+static char __pyx_k__unit_d[] = "unit_d";
+static char __pyx_k__unit_l[] = "unit_l";
+static char __pyx_k__unit_t[] = "unit_t";
+static char __pyx_k__argsort[] = "argsort";
+static char __pyx_k__float64[] = "float64";
+static char __pyx_k__grid_id[] = "grid_id";
+static char __pyx_k__m_nvars[] = "m_nvars";
+static char __pyx_k__nfields[] = "nfields";
+static char __pyx_k__omega_b[] = "omega_b";
+static char __pyx_k__omega_k[] = "omega_k";
+static char __pyx_k__omega_l[] = "omega_l";
+static char __pyx_k__omega_m[] = "omega_m";
+static char __pyx_k__strides[] = "strides";
+static char __pyx_k__varname[] = "varname";
+static char __pyx_k____main__[] = "__main__";
+static char __pyx_k____test__[] = "__test__";
+static char __pyx_k__itemsize[] = "itemsize";
+static char __pyx_k__levelmax[] = "levelmax";
+static char __pyx_k__levelmin[] = "levelmin";
+static char __pyx_k__m_header[] = "m_header";
+static char __pyx_k__ndomains[] = "ndomains";
+static char __pyx_k__ngridmax[] = "ngridmax";
+static char __pyx_k__readonly[] = "readonly";
+static char __pyx_k__type_num[] = "type_num";
+static char __pyx_k__byteorder[] = "byteorder";
+static char __pyx_k__field_ind[] = "field_ind";
+static char __pyx_k__grid_dims[] = "grid_dims";
+static char __pyx_k__is_finest[] = "is_finest";
+static char __pyx_k__left_edge[] = "left_edge";
+static char __pyx_k__signature[] = "signature";
+static char __pyx_k__ValueError[] = "ValueError";
+static char __pyx_k__child_mask[] = "child_mask";
+static char __pyx_k__dimensions[] = "dimensions";
+static char __pyx_k__efficiency[] = "efficiency";
+static char __pyx_k__get_parent[] = "get_parent";
+static char __pyx_k__left_edges[] = "left_edges";
+static char __pyx_k__left_index[] = "left_index";
+static char __pyx_k__m_maxlevel[] = "m_maxlevel";
+static char __pyx_k__m_varnames[] = "m_varnames";
+static char __pyx_k__ref_factor[] = "ref_factor";
+static char __pyx_k__right_edge[] = "right_edge";
+static char __pyx_k__suboffsets[] = "suboffsets";
+static char __pyx_k__field_names[] = "field_names";
+static char __pyx_k__grid_levels[] = "grid_levels";
+static char __pyx_k__hydro_datas[] = "hydro_datas";
+static char __pyx_k__m_var_array[] = "m_var_array";
+static char __pyx_k__right_edges[] = "right_edges";
+static char __pyx_k__start_index[] = "start_index";
+static char __pyx_k__RuntimeError[] = "RuntimeError";
+static char __pyx_k__domain_index[] = "domain_index";
+static char __pyx_k__m_AMR_levels[] = "m_AMR_levels";
+static char __pyx_k__nstep_coarse[] = "nstep_coarse";
+static char __pyx_k__ensure_loaded[] = "ensure_loaded";
+static char __pyx_k__snapshot_name[] = "snapshot_name";
+static char __pyx_k__grid_dimensions[] = "grid_dimensions";
+static char __pyx_k__grid_pos_double[] = "grid_pos_double";
+static char __pyx_k__component_grid_info[] = "component_grid_info";
+static char __pyx_k__grid_file_locations[] = "grid_file_locations";
+static PyObject *__pyx_kp_s_1;
+static PyObject *__pyx_n_s_2;
+static PyObject *__pyx_kp_u_3;
+static PyObject *__pyx_kp_u_4;
+static PyObject *__pyx_kp_u_5;
+static PyObject *__pyx_kp_u_6;
+static PyObject *__pyx_kp_u_7;
+static PyObject *__pyx_kp_u_8;
+static PyObject *__pyx_n_s__F;
+static PyObject *__pyx_n_s__H0;
+static PyObject *__pyx_n_s__RuntimeError;
+static PyObject *__pyx_n_s__ValueError;
+static PyObject *__pyx_n_s____main__;
+static PyObject *__pyx_n_s____test__;
+static PyObject *__pyx_n_s__aexp;
+static PyObject *__pyx_n_s__argsort;
+static PyObject *__pyx_n_s__base;
+static PyObject *__pyx_n_s__begin;
+static PyObject *__pyx_n_s__boxlen;
+static PyObject *__pyx_n_s__buf;
+static PyObject *__pyx_n_s__byteorder;
+static PyObject *__pyx_n_s__c_str;
+static PyObject *__pyx_n_s__child_mask;
+static PyObject *__pyx_n_s__component_grid_info;
+static PyObject *__pyx_n_s__data;
+static PyObject *__pyx_n_s__dd;
+static PyObject *__pyx_n_s__descr;
+static PyObject *__pyx_n_s__dimensions;
+static PyObject *__pyx_n_s__domain;
+static PyObject *__pyx_n_s__domain_index;
+static PyObject *__pyx_n_s__dtype;
+static PyObject *__pyx_n_s__efficiency;
+static PyObject *__pyx_n_s__empty;
+static PyObject *__pyx_n_s__end;
+static PyObject *__pyx_n_s__ensure_loaded;
+static PyObject *__pyx_n_s__field;
+static PyObject *__pyx_n_s__field_ind;
+static PyObject *__pyx_n_s__field_names;
+static PyObject *__pyx_n_s__fields;
+static PyObject *__pyx_n_s__filled;
+static PyObject *__pyx_n_s__float64;
+static PyObject *__pyx_n_s__fn;
+static PyObject *__pyx_n_s__format;
+static PyObject *__pyx_n_s__get_parent;
+static PyObject *__pyx_n_s__grid_dimensions;
+static PyObject *__pyx_n_s__grid_dims;
+static PyObject *__pyx_n_s__grid_file_locations;
+static PyObject *__pyx_n_s__grid_id;
+static PyObject *__pyx_n_s__grid_levels;
+static PyObject *__pyx_n_s__grid_pos_double;
+static PyObject *__pyx_n_s__hydro_datas;
+static PyObject *__pyx_n_s__int64;
+static PyObject *__pyx_n_s__is_finest;
+static PyObject *__pyx_n_s__itemsize;
+static PyObject *__pyx_n_s__left_edge;
+static PyObject *__pyx_n_s__left_edges;
+static PyObject *__pyx_n_s__left_index;
+static PyObject *__pyx_n_s__level;
+static PyObject *__pyx_n_s__levelmax;
+static PyObject *__pyx_n_s__levelmin;
+static PyObject *__pyx_n_s__loaded;
+static PyObject *__pyx_n_s__m_AMR_levels;
+static PyObject *__pyx_n_s__m_header;
+static PyObject *__pyx_n_s__m_maxlevel;
+static PyObject *__pyx_n_s__m_nvars;
+static PyObject *__pyx_n_s__m_var_array;
+static PyObject *__pyx_n_s__m_varnames;
+static PyObject *__pyx_n_s__names;
+static PyObject *__pyx_n_s__ncpu;
+static PyObject *__pyx_n_s__ndim;
+static PyObject *__pyx_n_s__ndomains;
+static PyObject *__pyx_n_s__next;
+static PyObject *__pyx_n_s__nfields;
+static PyObject *__pyx_n_s__ngridmax;
+static PyObject *__pyx_n_s__np;
+static PyObject *__pyx_n_s__nstep_coarse;
+static PyObject *__pyx_n_s__numpy;
+static PyObject *__pyx_n_s__obj;
+static PyObject *__pyx_n_s__omega_b;
+static PyObject *__pyx_n_s__omega_k;
+static PyObject *__pyx_n_s__omega_l;
+static PyObject *__pyx_n_s__omega_m;
+static PyObject *__pyx_n_s__ones;
+static PyObject *__pyx_n_s__order;
+static PyObject *__pyx_n_s__range;
+static PyObject *__pyx_n_s__read;
+static PyObject *__pyx_n_s__readonly;
+static PyObject *__pyx_n_s__ref_factor;
+static PyObject *__pyx_n_s__right_edge;
+static PyObject *__pyx_n_s__right_edges;
+static PyObject *__pyx_n_s__rsnap;
+static PyObject *__pyx_n_s__shape;
+static PyObject *__pyx_n_s__signature;
+static PyObject *__pyx_n_s__sigs;
+static PyObject *__pyx_n_s__size;
+static PyObject *__pyx_n_s__snapshot_name;
+static PyObject *__pyx_n_s__start_index;
+static PyObject *__pyx_n_s__strides;
+static PyObject *__pyx_n_s__suboffsets;
+static PyObject *__pyx_n_s__time;
+static PyObject *__pyx_n_s__trees;
+static PyObject *__pyx_n_s__type_num;
+static PyObject *__pyx_n_s__unit_d;
+static PyObject *__pyx_n_s__unit_l;
+static PyObject *__pyx_n_s__unit_t;
+static PyObject *__pyx_n_s__varname;
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+ *                     new RAMSES_hydro_data(deref(local_tree))
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+ */
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+  /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":415
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+ */
+  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 534; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(((PyObject *)__pyx_t_1));
+  __Pyx_DECREF(((PyObject *)__pyx_v_level_cell_counts));
+  __pyx_v_level_cell_counts = __pyx_t_1;
+  __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":535
+ *         cell_count = []
+ *         level_cell_counts = {}
+ *         for idomain in range(1, self.rsnap.m_header.ncpu + 1):             # <<<<<<<<<<<<<<
+ *             local_tree = new RAMSES_tree(deref(self.rsnap), idomain,
+ *                                          self.rsnap.m_header.levelmax, 0)
+ */
+  __pyx_t_2 = (((struct __pyx_obj_2yt_13ramses_reader_RAMSES_tree_proxy *)__pyx_v_self)->rsnap->m_header.ncpu + 1);
+  for (__pyx_t_3 = 1; __pyx_t_3 < __pyx_t_2; __pyx_t_3+=1) {
+    __pyx_v_idomain = __pyx_t_3;
+
+    /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":537
+ *         for idomain in range(1, self.rsnap.m_header.ncpu + 1):
+ *             local_tree = new RAMSES_tree(deref(self.rsnap), idomain,
+ *                                          self.rsnap.m_header.levelmax, 0)             # <<<<<<<<<<<<<<
+ *             local_tree.read()
+ *             local_hydro_data = new RAMSES_hydro_data(deref(local_tree))
+ */
+    __pyx_v_local_tree = new RAMSES::AMR::RAMSES_tree((*((struct __pyx_obj_2yt_13ramses_reader_RAMSES_tree_proxy *)__pyx_v_self)->rsnap), __pyx_v_idomain, ((struct __pyx_obj_2yt_13ramses_reader_RAMSES_tree_proxy *)__pyx_v_self)->rsnap->m_header.levelmax, 0);
+
+    /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":538
+ *             local_tree = new RAMSES_tree(deref(self.rsnap), idomain,
+ *                                          self.rsnap.m_header.levelmax, 0)
+ *             local_tree.read()             # <<<<<<<<<<<<<<
+ *             local_hydro_data = new RAMSES_hydro_data(deref(local_tree))
+ *             for ilevel in range(local_tree.m_maxlevel + 1):
+ */
+    __pyx_v_local_tree->read();
+
+    /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":539
+ *                                          self.rsnap.m_header.levelmax, 0)
+ *             local_tree.read()
+ *             local_hydro_data = new RAMSES_hydro_data(deref(local_tree))             # <<<<<<<<<<<<<<
+ *             for ilevel in range(local_tree.m_maxlevel + 1):
+ *                 # this gets overwritten for every domain, which is okay
+ */
+    __pyx_v_local_hydro_data = new RAMSES::HYDRO::RAMSES_hydro_data((*__pyx_v_local_tree));
+
+    /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":540
+ *             local_tree.read()
+ *             local_hydro_data = new RAMSES_hydro_data(deref(local_tree))
+ *             for ilevel in range(local_tree.m_maxlevel + 1):             # <<<<<<<<<<<<<<
+ *                 # this gets overwritten for every domain, which is okay
+ *                 level_cell_counts[ilevel] = grid_ind
+ */
+    __pyx_t_4 = (__pyx_v_local_tree->m_maxlevel + 1);
+    for (__pyx_t_5 = 0; __pyx_t_5 < __pyx_t_4; __pyx_t_5+=1) {
+      __pyx_v_ilevel = __pyx_t_5;
+
+      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":542
+ *             for ilevel in range(local_tree.m_maxlevel + 1):
+ *                 # this gets overwritten for every domain, which is okay
+ *                 level_cell_counts[ilevel] = grid_ind             # <<<<<<<<<<<<<<
+ *                 grid_half_width = self.rsnap.m_header.boxlen / (2**(ilevel + 1))
+ *                 grid_it = local_tree.begin(ilevel)
+ */
+      __pyx_t_1 = PyInt_FromLong(__pyx_v_grid_ind); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 542; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __Pyx_GOTREF(__pyx_t_1);
+      if (__Pyx_SetItemInt(((PyObject *)__pyx_v_level_cell_counts), __pyx_v_ilevel, __pyx_t_1, sizeof(unsigned int)+1, PyLong_FromUnsignedLong) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 542; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":543
+ *                 # this gets overwritten for every domain, which is okay
+ *                 level_cell_counts[ilevel] = grid_ind
+ *                 grid_half_width = self.rsnap.m_header.boxlen / (2**(ilevel + 1))             # <<<<<<<<<<<<<<
+ *                 grid_it = local_tree.begin(ilevel)
+ *                 grid_end = local_tree.end(ilevel)
+ */
+      __pyx_t_6 = __Pyx_pow_long(2, (__pyx_v_ilevel + 1));
+      if (unlikely(__pyx_t_6 == 0)) {
+        PyErr_Format(PyExc_ZeroDivisionError, "float division");
+        {__pyx_filename = __pyx_f[0]; __pyx_lineno = 543; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      }
+      __pyx_v_grid_half_width = (((struct __pyx_obj_2yt_13ramses_reader_RAMSES_tree_proxy *)__pyx_v_self)->rsnap->m_header.boxlen / __pyx_t_6);
+
+      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":544
+ *                 level_cell_counts[ilevel] = grid_ind
+ *                 grid_half_width = self.rsnap.m_header.boxlen / (2**(ilevel + 1))
+ *                 grid_it = local_tree.begin(ilevel)             # <<<<<<<<<<<<<<
+ *                 grid_end = local_tree.end(ilevel)
+ *                 while grid_it != grid_end:
+ */
+      __pyx_v_grid_it = __pyx_v_local_tree->begin(__pyx_v_ilevel);
+
+      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":545
+ *                 grid_half_width = self.rsnap.m_header.boxlen / (2**(ilevel + 1))
+ *                 grid_it = local_tree.begin(ilevel)
+ *                 grid_end = local_tree.end(ilevel)             # <<<<<<<<<<<<<<
+ *                 while grid_it != grid_end:
+ *                     gvec = local_tree.grid_pos_double(grid_it)
+ */
+      __pyx_v_grid_end = __pyx_v_local_tree->end(__pyx_v_ilevel);
+
+      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":546
+ *                 grid_it = local_tree.begin(ilevel)
+ *                 grid_end = local_tree.end(ilevel)
+ *                 while grid_it != grid_end:             # <<<<<<<<<<<<<<
+ *                     gvec = local_tree.grid_pos_double(grid_it)
+ *                     left_edges[grid_ind, 0] = gvec.x - grid_half_width
+ */
+      while (1) {
+        __pyx_t_7 = (__pyx_v_grid_it != __pyx_v_grid_end);
+        if (!__pyx_t_7) break;
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":547
+ *                 grid_end = local_tree.end(ilevel)
+ *                 while grid_it != grid_end:
+ *                     gvec = local_tree.grid_pos_double(grid_it)             # <<<<<<<<<<<<<<
+ *                     left_edges[grid_ind, 0] = gvec.x - grid_half_width
+ *                     left_edges[grid_ind, 1] = gvec.y - grid_half_width
+ */
+        __pyx_v_gvec = __pyx_v_local_tree->grid_pos<double>(__pyx_v_grid_it);
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":548
+ *                 while grid_it != grid_end:
+ *                     gvec = local_tree.grid_pos_double(grid_it)
+ *                     left_edges[grid_ind, 0] = gvec.x - grid_half_width             # <<<<<<<<<<<<<<
+ *                     left_edges[grid_ind, 1] = gvec.y - grid_half_width
+ *                     left_edges[grid_ind, 2] = gvec.z - grid_half_width
+ */
+        __pyx_t_8 = __pyx_v_grid_ind;
+        __pyx_t_6 = 0;
+        __pyx_t_9 = -1;
+        if (__pyx_t_8 < 0) {
+          __pyx_t_8 += __pyx_bshape_0_left_edges;
+          if (unlikely(__pyx_t_8 < 0)) __pyx_t_9 = 0;
+        } else if (unlikely(__pyx_t_8 >= __pyx_bshape_0_left_edges)) __pyx_t_9 = 0;
+        if (__pyx_t_6 < 0) {
+          __pyx_t_6 += __pyx_bshape_1_left_edges;
+          if (unlikely(__pyx_t_6 < 0)) __pyx_t_9 = 1;
+        } else if (unlikely(__pyx_t_6 >= __pyx_bshape_1_left_edges)) __pyx_t_9 = 1;
+        if (unlikely(__pyx_t_9 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_9);
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 548; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_left_edges.buf, __pyx_t_8, __pyx_bstride_0_left_edges, __pyx_t_6, __pyx_bstride_1_left_edges) = (__pyx_v_gvec.x - __pyx_v_grid_half_width);
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":549
+ *                     gvec = local_tree.grid_pos_double(grid_it)
+ *                     left_edges[grid_ind, 0] = gvec.x - grid_half_width
+ *                     left_edges[grid_ind, 1] = gvec.y - grid_half_width             # <<<<<<<<<<<<<<
+ *                     left_edges[grid_ind, 2] = gvec.z - grid_half_width
+ *                     right_edges[grid_ind, 0] = gvec.x + grid_half_width
+ */
+        __pyx_t_9 = __pyx_v_grid_ind;
+        __pyx_t_10 = 1;
+        __pyx_t_11 = -1;
+        if (__pyx_t_9 < 0) {
+          __pyx_t_9 += __pyx_bshape_0_left_edges;
+          if (unlikely(__pyx_t_9 < 0)) __pyx_t_11 = 0;
+        } else if (unlikely(__pyx_t_9 >= __pyx_bshape_0_left_edges)) __pyx_t_11 = 0;
+        if (__pyx_t_10 < 0) {
+          __pyx_t_10 += __pyx_bshape_1_left_edges;
+          if (unlikely(__pyx_t_10 < 0)) __pyx_t_11 = 1;
+        } else if (unlikely(__pyx_t_10 >= __pyx_bshape_1_left_edges)) __pyx_t_11 = 1;
+        if (unlikely(__pyx_t_11 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_11);
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 549; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_left_edges.buf, __pyx_t_9, __pyx_bstride_0_left_edges, __pyx_t_10, __pyx_bstride_1_left_edges) = (__pyx_v_gvec.y - __pyx_v_grid_half_width);
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":550
+ *                     left_edges[grid_ind, 0] = gvec.x - grid_half_width
+ *                     left_edges[grid_ind, 1] = gvec.y - grid_half_width
+ *                     left_edges[grid_ind, 2] = gvec.z - grid_half_width             # <<<<<<<<<<<<<<
+ *                     right_edges[grid_ind, 0] = gvec.x + grid_half_width
+ *                     right_edges[grid_ind, 1] = gvec.y + grid_half_width
+ */
+        __pyx_t_11 = __pyx_v_grid_ind;
+        __pyx_t_12 = 2;
+        __pyx_t_13 = -1;
+        if (__pyx_t_11 < 0) {
+          __pyx_t_11 += __pyx_bshape_0_left_edges;
+          if (unlikely(__pyx_t_11 < 0)) __pyx_t_13 = 0;
+        } else if (unlikely(__pyx_t_11 >= __pyx_bshape_0_left_edges)) __pyx_t_13 = 0;
+        if (__pyx_t_12 < 0) {
+          __pyx_t_12 += __pyx_bshape_1_left_edges;
+          if (unlikely(__pyx_t_12 < 0)) __pyx_t_13 = 1;
+        } else if (unlikely(__pyx_t_12 >= __pyx_bshape_1_left_edges)) __pyx_t_13 = 1;
+        if (unlikely(__pyx_t_13 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_13);
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 550; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_left_edges.buf, __pyx_t_11, __pyx_bstride_0_left_edges, __pyx_t_12, __pyx_bstride_1_left_edges) = (__pyx_v_gvec.z - __pyx_v_grid_half_width);
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":551
+ *                     left_edges[grid_ind, 1] = gvec.y - grid_half_width
+ *                     left_edges[grid_ind, 2] = gvec.z - grid_half_width
+ *                     right_edges[grid_ind, 0] = gvec.x + grid_half_width             # <<<<<<<<<<<<<<
+ *                     right_edges[grid_ind, 1] = gvec.y + grid_half_width
+ *                     right_edges[grid_ind, 2] = gvec.z + grid_half_width
+ */
+        __pyx_t_13 = __pyx_v_grid_ind;
+        __pyx_t_14 = 0;
+        __pyx_t_15 = -1;
+        if (__pyx_t_13 < 0) {
+          __pyx_t_13 += __pyx_bshape_0_right_edges;
+          if (unlikely(__pyx_t_13 < 0)) __pyx_t_15 = 0;
+        } else if (unlikely(__pyx_t_13 >= __pyx_bshape_0_right_edges)) __pyx_t_15 = 0;
+        if (__pyx_t_14 < 0) {
+          __pyx_t_14 += __pyx_bshape_1_right_edges;
+          if (unlikely(__pyx_t_14 < 0)) __pyx_t_15 = 1;
+        } else if (unlikely(__pyx_t_14 >= __pyx_bshape_1_right_edges)) __pyx_t_15 = 1;
+        if (unlikely(__pyx_t_15 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_15);
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 551; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_right_edges.buf, __pyx_t_13, __pyx_bstride_0_right_edges, __pyx_t_14, __pyx_bstride_1_right_edges) = (__pyx_v_gvec.x + __pyx_v_grid_half_width);
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":552
+ *                     left_edges[grid_ind, 2] = gvec.z - grid_half_width
+ *                     right_edges[grid_ind, 0] = gvec.x + grid_half_width
+ *                     right_edges[grid_ind, 1] = gvec.y + grid_half_width             # <<<<<<<<<<<<<<
+ *                     right_edges[grid_ind, 2] = gvec.z + grid_half_width
+ *                     grid_levels[grid_ind, 0] = ilevel
+ */
+        __pyx_t_15 = __pyx_v_grid_ind;
+        __pyx_t_16 = 1;
+        __pyx_t_17 = -1;
+        if (__pyx_t_15 < 0) {
+          __pyx_t_15 += __pyx_bshape_0_right_edges;
+          if (unlikely(__pyx_t_15 < 0)) __pyx_t_17 = 0;
+        } else if (unlikely(__pyx_t_15 >= __pyx_bshape_0_right_edges)) __pyx_t_17 = 0;
+        if (__pyx_t_16 < 0) {
+          __pyx_t_16 += __pyx_bshape_1_right_edges;
+          if (unlikely(__pyx_t_16 < 0)) __pyx_t_17 = 1;
+        } else if (unlikely(__pyx_t_16 >= __pyx_bshape_1_right_edges)) __pyx_t_17 = 1;
+        if (unlikely(__pyx_t_17 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_17);
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 552; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_right_edges.buf, __pyx_t_15, __pyx_bstride_0_right_edges, __pyx_t_16, __pyx_bstride_1_right_edges) = (__pyx_v_gvec.y + __pyx_v_grid_half_width);
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":553
+ *                     right_edges[grid_ind, 0] = gvec.x + grid_half_width
+ *                     right_edges[grid_ind, 1] = gvec.y + grid_half_width
+ *                     right_edges[grid_ind, 2] = gvec.z + grid_half_width             # <<<<<<<<<<<<<<
+ *                     grid_levels[grid_ind, 0] = ilevel
+ *                     # Now the harder part
+ */
+        __pyx_t_17 = __pyx_v_grid_ind;
+        __pyx_t_18 = 2;
+        __pyx_t_19 = -1;
+        if (__pyx_t_17 < 0) {
+          __pyx_t_17 += __pyx_bshape_0_right_edges;
+          if (unlikely(__pyx_t_17 < 0)) __pyx_t_19 = 0;
+        } else if (unlikely(__pyx_t_17 >= __pyx_bshape_0_right_edges)) __pyx_t_19 = 0;
+        if (__pyx_t_18 < 0) {
+          __pyx_t_18 += __pyx_bshape_1_right_edges;
+          if (unlikely(__pyx_t_18 < 0)) __pyx_t_19 = 1;
+        } else if (unlikely(__pyx_t_18 >= __pyx_bshape_1_right_edges)) __pyx_t_19 = 1;
+        if (unlikely(__pyx_t_19 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_19);
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 553; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_right_edges.buf, __pyx_t_17, __pyx_bstride_0_right_edges, __pyx_t_18, __pyx_bstride_1_right_edges) = (__pyx_v_gvec.z + __pyx_v_grid_half_width);
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":554
+ *                     right_edges[grid_ind, 1] = gvec.y + grid_half_width
+ *                     right_edges[grid_ind, 2] = gvec.z + grid_half_width
+ *                     grid_levels[grid_ind, 0] = ilevel             # <<<<<<<<<<<<<<
+ *                     # Now the harder part
+ *                     father_it = grid_it.get_parent()
+ */
+        __pyx_t_19 = __pyx_v_grid_ind;
+        __pyx_t_20 = 0;
+        __pyx_t_21 = -1;
+        if (__pyx_t_19 < 0) {
+          __pyx_t_19 += __pyx_bshape_0_grid_levels;
+          if (unlikely(__pyx_t_19 < 0)) __pyx_t_21 = 0;
+        } else if (unlikely(__pyx_t_19 >= __pyx_bshape_0_grid_levels)) __pyx_t_21 = 0;
+        if (__pyx_t_20 < 0) {
+          __pyx_t_20 += __pyx_bshape_1_grid_levels;
+          if (unlikely(__pyx_t_20 < 0)) __pyx_t_21 = 1;
+        } else if (unlikely(__pyx_t_20 >= __pyx_bshape_1_grid_levels)) __pyx_t_21 = 1;
+        if (unlikely(__pyx_t_21 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_21);
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 554; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_int32_t *, __pyx_bstruct_grid_levels.buf, __pyx_t_19, __pyx_bstride_0_grid_levels, __pyx_t_20, __pyx_bstride_1_grid_levels) = __pyx_v_ilevel;
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":556
+ *                     grid_levels[grid_ind, 0] = ilevel
+ *                     # Now the harder part
+ *                     father_it = grid_it.get_parent()             # <<<<<<<<<<<<<<
+ *                     grid_file_locations[grid_ind, 0] = <np.int64_t> idomain
+ *                     grid_file_locations[grid_ind, 1] = grid_ind - level_cell_counts[ilevel]
+ */
+        __pyx_v_father_it = __pyx_v_grid_it.get_parent();
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":557
+ *                     # Now the harder part
+ *                     father_it = grid_it.get_parent()
+ *                     grid_file_locations[grid_ind, 0] = <np.int64_t> idomain             # <<<<<<<<<<<<<<
+ *                     grid_file_locations[grid_ind, 1] = grid_ind - level_cell_counts[ilevel]
+ *                     parent_ind = father_it.get_absolute_position()
+ */
+        __pyx_t_21 = __pyx_v_grid_ind;
+        __pyx_t_22 = 0;
+        __pyx_t_23 = -1;
+        if (__pyx_t_21 < 0) {
+          __pyx_t_21 += __pyx_bshape_0_grid_file_locations;
+          if (unlikely(__pyx_t_21 < 0)) __pyx_t_23 = 0;
+        } else if (unlikely(__pyx_t_21 >= __pyx_bshape_0_grid_file_locations)) __pyx_t_23 = 0;
+        if (__pyx_t_22 < 0) {
+          __pyx_t_22 += __pyx_bshape_1_grid_file_locations;
+          if (unlikely(__pyx_t_22 < 0)) __pyx_t_23 = 1;
+        } else if (unlikely(__pyx_t_22 >= __pyx_bshape_1_grid_file_locations)) __pyx_t_23 = 1;
+        if (unlikely(__pyx_t_23 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_23);
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 557; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_grid_file_locations.buf, __pyx_t_21, __pyx_bstride_0_grid_file_locations, __pyx_t_22, __pyx_bstride_1_grid_file_locations) = ((__pyx_t_5numpy_int64_t)__pyx_v_idomain);
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":558
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+
+    /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":629
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+ *             offset = ogrid_info[1]             # <<<<<<<<<<<<<<
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+ *             for i in range(2*ref_factor):             # <<<<<<<<<<<<<<
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+ *                 if di < start_index[0] or di >= end_index[0]: continue             # <<<<<<<<<<<<<<
+ *                 ir = <int> (i / ref_factor)
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+      __pyx_t_19 = -1;
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+      if (unlikely(__pyx_t_19 != -1)) {
+        __Pyx_RaiseBufferIndexError(__pyx_t_19);
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+      if (__pyx_t_23) {
+        goto __pyx_L10_continue;
+        goto __pyx_L12;
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+      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":634
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+ *                 ir = <int> (i / ref_factor)             # <<<<<<<<<<<<<<
+ *                 for j in range(2 * ref_factor):
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+        {__pyx_filename = __pyx_f[0]; __pyx_lineno = 634; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      }
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+        PyErr_Format(PyExc_OverflowError, "value too large to perform division");
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+      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":635
+ *                 if di < start_index[0] or di >= end_index[0]: continue
+ *                 ir = <int> (i / ref_factor)
+ *                 for j in range(2 * ref_factor):             # <<<<<<<<<<<<<<
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+ *                     if dj < start_index[1] or dj >= end_index[1]: continue
+ */
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+      for (__pyx_t_19 = 0; __pyx_t_19 < __pyx_t_24; __pyx_t_19+=1) {
+        __pyx_v_j = __pyx_t_19;
+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":636
+ *                 ir = <int> (i / ref_factor)
+ *                 for j in range(2 * ref_factor):
+ *                     dj = j + og_start_index[1] * ref_factor             # <<<<<<<<<<<<<<
+ *                     if dj < start_index[1] or dj >= end_index[1]: continue
+ *                     jr = <int> (j / ref_factor)
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+          __Pyx_RaiseBufferIndexError(__pyx_t_26);
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 636; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":637
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+ *                     dj = j + og_start_index[1] * ref_factor
+ *                     if dj < start_index[1] or dj >= end_index[1]: continue             # <<<<<<<<<<<<<<
+ *                     jr = <int> (j / ref_factor)
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+        __pyx_t_26 = -1;
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+        if (unlikely(__pyx_t_26 != -1)) {
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+        if (__pyx_t_22) {
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+          goto __pyx_L15;
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+
+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":638
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+ *                     if dj < start_index[1] or dj >= end_index[1]: continue
+ *                     jr = <int> (j / ref_factor)             # <<<<<<<<<<<<<<
+ *                     for k in range(2 * ref_factor):
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+          PyErr_Format(PyExc_ZeroDivisionError, "integer division or modulo by zero");
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 638; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+        else if (sizeof(int) == sizeof(long) && unlikely(__pyx_v_ref_factor == -1) && unlikely(UNARY_NEG_WOULD_OVERFLOW(__pyx_v_j))) {
+          PyErr_Format(PyExc_OverflowError, "value too large to perform division");
+          {__pyx_filename = __pyx_f[0]; __pyx_lineno = 638; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+ *                     for k in range(2 * ref_factor):             # <<<<<<<<<<<<<<
+ *                         dk = k + og_start_index[2] * ref_factor
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+ *                     jr = <int> (j / ref_factor)
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+ *                         dk = k + og_start_index[2] * ref_factor             # <<<<<<<<<<<<<<
+ *                         if dk < start_index[2] or dk >= end_index[2]: continue
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+
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+ *                         kr = <int> (k / ref_factor)
+ *                         offi = di - start_index[0]             # <<<<<<<<<<<<<<
+ *                         offj = dj - start_index[1]
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+          __pyx_t_30 = -1;
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+            __Pyx_RaiseBufferIndexError(__pyx_t_30);
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+
+          /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":644
+ *                         kr = <int> (k / ref_factor)
+ *                         offi = di - start_index[0]
+ *                         offj = dj - start_index[1]             # <<<<<<<<<<<<<<
+ *                         offk = dk - start_index[2]
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+ */
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+          __pyx_t_30 = -1;
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+          if (unlikely(__pyx_t_30 != -1)) {
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+            {__pyx_filename = __pyx_f[0]; __pyx_lineno = 644; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+
+          /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":645
+ *                         offi = di - start_index[0]
+ *                         offj = dj - start_index[1]
+ *                         offk = dk - start_index[2]             # <<<<<<<<<<<<<<
+ *                         #print offi, filled.shape[0],
+ *                         #print offj, filled.shape[1],
+ */
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+          __pyx_t_30 = -1;
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+
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+ */
+      goto __pyx_L8_continue;
+      goto __pyx_L10;
+    }
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+    /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":698
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+ *                continue
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+ */
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+      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":699
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+ *                 if i0 >= self.right_edge[0]: break             # <<<<<<<<<<<<<<
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+      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":728
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+ *                 for l1 in range(grid_dimensions[gi, 1]):             # <<<<<<<<<<<<<<
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+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":730
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+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":731
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+ *                     if i1 >= self.right_edge[1]: break             # <<<<<<<<<<<<<<
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+        __pyx_L25:;
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+        /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":732
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+ *                     for l2 in range(grid_dimensions[gi, 2]):             # <<<<<<<<<<<<<<
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+          /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":734
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+ */
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+            goto __pyx_L26_continue;
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+          __pyx_L28:;
+
+          /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":735
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+ *                         if i2 >= self.right_edge[2]: break             # <<<<<<<<<<<<<<
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+            goto __pyx_L27_break;
+            goto __pyx_L29;
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+          /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":736
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+ *                         if i2 >= self.right_edge[2]: break
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+            {__pyx_filename = __pyx_f[0]; __pyx_lineno = 737; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+ *                         sig0[i] += 1
+ *                         i = i1 - self.left_edge[1]             # <<<<<<<<<<<<<<
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+          /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":739
+ *                         sig0[i] += 1
+ *                         i = i1 - self.left_edge[1]
+ *                         sig1[i] += 1             # <<<<<<<<<<<<<<
+ *                         i = i2 - self.left_edge[2]
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+}
+
+static int __pyx_tp_traverse_2yt_13ramses_reader_ProtoSubgrid(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_2yt_13ramses_reader_ProtoSubgrid *p = (struct __pyx_obj_2yt_13ramses_reader_ProtoSubgrid *)o;
+  if (p->sigs) {
+    e = (*v)(p->sigs, a); if (e) return e;
+  }
+  if (p->grid_file_locations) {
+    e = (*v)(p->grid_file_locations, a); if (e) return e;
+  }
+  if (p->dd) {
+    e = (*v)(p->dd, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_2yt_13ramses_reader_ProtoSubgrid(PyObject *o) {
+  struct __pyx_obj_2yt_13ramses_reader_ProtoSubgrid *p = (struct __pyx_obj_2yt_13ramses_reader_ProtoSubgrid *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->sigs);
+  p->sigs = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->grid_file_locations);
+  p->grid_file_locations = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->dd);
+  p->dd = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyObject *__pyx_getprop_2yt_13ramses_reader_12ProtoSubgrid_efficiency(PyObject *o, void *x) {
+  return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_10efficiency___get__(o);
+}
+
+static int __pyx_setprop_2yt_13ramses_reader_12ProtoSubgrid_efficiency(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_10efficiency___set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_13ramses_reader_12ProtoSubgrid_sigs(PyObject *o, void *x) {
+  return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_4sigs___get__(o);
+}
+
+static int __pyx_setprop_2yt_13ramses_reader_12ProtoSubgrid_sigs(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_4sigs___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_4sigs___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_13ramses_reader_12ProtoSubgrid_grid_file_locations(PyObject *o, void *x) {
+  return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_19grid_file_locations___get__(o);
+}
+
+static int __pyx_setprop_2yt_13ramses_reader_12ProtoSubgrid_grid_file_locations(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_19grid_file_locations___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_19grid_file_locations___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_13ramses_reader_12ProtoSubgrid_dd(PyObject *o, void *x) {
+  return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_2dd___get__(o);
+}
+
+static int __pyx_setprop_2yt_13ramses_reader_12ProtoSubgrid_dd(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_2dd___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_2dd___del__(o);
+  }
+}
+
+static PyMethodDef __pyx_methods_2yt_13ramses_reader_ProtoSubgrid[] = {
+  {__Pyx_NAMESTR("find_split"), (PyCFunction)__pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_find_split, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("get_properties"), (PyCFunction)__pyx_pf_2yt_13ramses_reader_12ProtoSubgrid_get_properties, METH_NOARGS, __Pyx_DOCSTR(0)},
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_2yt_13ramses_reader_ProtoSubgrid[] = {
+  {(char *)"efficiency", __pyx_getprop_2yt_13ramses_reader_12ProtoSubgrid_efficiency, __pyx_setprop_2yt_13ramses_reader_12ProtoSubgrid_efficiency, 0, 0},
+  {(char *)"sigs", __pyx_getprop_2yt_13ramses_reader_12ProtoSubgrid_sigs, __pyx_setprop_2yt_13ramses_reader_12ProtoSubgrid_sigs, 0, 0},
+  {(char *)"grid_file_locations", __pyx_getprop_2yt_13ramses_reader_12ProtoSubgrid_grid_file_locations, __pyx_setprop_2yt_13ramses_reader_12ProtoSubgrid_grid_file_locations, 0, 0},
+  {(char *)"dd", __pyx_getprop_2yt_13ramses_reader_12ProtoSubgrid_dd, __pyx_setprop_2yt_13ramses_reader_12ProtoSubgrid_dd, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_ProtoSubgrid = {
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+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*nb_long*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_ProtoSubgrid = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_ProtoSubgrid = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_ProtoSubgrid = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+PyTypeObject __pyx_type_2yt_13ramses_reader_ProtoSubgrid = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("yt.ramses_reader.ProtoSubgrid"), /*tp_name*/
+  sizeof(struct __pyx_obj_2yt_13ramses_reader_ProtoSubgrid), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_2yt_13ramses_reader_ProtoSubgrid, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*tp_compare*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_ProtoSubgrid, /*tp_as_number*/
+  &__pyx_tp_as_sequence_ProtoSubgrid, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_ProtoSubgrid, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_ProtoSubgrid, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_2yt_13ramses_reader_ProtoSubgrid, /*tp_traverse*/
+  __pyx_tp_clear_2yt_13ramses_reader_ProtoSubgrid, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_13ramses_reader_ProtoSubgrid, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_2yt_13ramses_reader_ProtoSubgrid, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_13ramses_reader_ProtoSubgrid, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyMethodDef __pyx_methods[] = {
+  {0, 0, 0, 0}
+};
+
+#if PY_MAJOR_VERSION >= 3
+static struct PyModuleDef __pyx_moduledef = {
+    PyModuleDef_HEAD_INIT,
+    __Pyx_NAMESTR("ramses_reader"),
+    __Pyx_DOCSTR(__pyx_k_9), /* m_doc */
+    -1, /* m_size */
+    __pyx_methods /* m_methods */,
+    NULL, /* m_reload */
+    NULL, /* m_traverse */
+    NULL, /* m_clear */
+    NULL /* m_free */
+};
+#endif
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+}
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+}
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+PyMODINIT_FUNC initramses_reader(void); /*proto*/
+PyMODINIT_FUNC initramses_reader(void)
+#else
+PyMODINIT_FUNC PyInit_ramses_reader(void); /*proto*/
+PyMODINIT_FUNC PyInit_ramses_reader(void)
+#endif
+{
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+  #if CYTHON_REFNANNY
+  void* __pyx_refnanny = NULL;
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+  #ifdef __pyx_binding_PyCFunctionType_USED
+  if (__pyx_binding_PyCFunctionType_init() < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  #endif
+  /*--- Library function declarations ---*/
+  /*--- Threads initialization code ---*/
+  #if defined(__PYX_FORCE_INIT_THREADS) && __PYX_FORCE_INIT_THREADS
+  #ifdef WITH_THREAD /* Python build with threading support? */
+  PyEval_InitThreads();
+  #endif
+  #endif
+  /*--- Module creation code ---*/
+  #if PY_MAJOR_VERSION < 3
+  __pyx_m = Py_InitModule4(__Pyx_NAMESTR("ramses_reader"), __pyx_methods, __Pyx_DOCSTR(__pyx_k_9), 0, PYTHON_API_VERSION);
+  #else
+  __pyx_m = PyModule_Create(&__pyx_moduledef);
+  #endif
+  if (!__pyx_m) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  #if PY_MAJOR_VERSION < 3
+  Py_INCREF(__pyx_m);
+  #endif
+  __pyx_b = PyImport_AddModule(__Pyx_NAMESTR(__Pyx_BUILTIN_MODULE_NAME));
+  if (!__pyx_b) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  if (__Pyx_SetAttrString(__pyx_m, "__builtins__", __pyx_b) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  /*--- Initialize various global constants etc. ---*/
+  if (unlikely(__Pyx_InitGlobals() < 0)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__pyx_module_is_main_yt__ramses_reader) {
+    if (__Pyx_SetAttrString(__pyx_m, "__name__", __pyx_n_s____main__) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  }
+  /*--- Builtin init code ---*/
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+  /*--- Global init code ---*/
+  /*--- Function export code ---*/
+  /*--- Type init code ---*/
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+  if (__Pyx_SetAttrString(__pyx_m, "RAMSES_tree_proxy", (PyObject *)&__pyx_type_2yt_13ramses_reader_RAMSES_tree_proxy) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 370; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_13ramses_reader_RAMSES_tree_proxy = &__pyx_type_2yt_13ramses_reader_RAMSES_tree_proxy;
+  if (PyType_Ready(&__pyx_type_2yt_13ramses_reader_ProtoSubgrid) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 659; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "ProtoSubgrid", (PyObject *)&__pyx_type_2yt_13ramses_reader_ProtoSubgrid) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 659; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_13ramses_reader_ProtoSubgrid = &__pyx_type_2yt_13ramses_reader_ProtoSubgrid;
+  /*--- Type import code ---*/
+  __pyx_ptype_5numpy_dtype = __Pyx_ImportType("numpy", "dtype", sizeof(PyArray_Descr), 0); if (unlikely(!__pyx_ptype_5numpy_dtype)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 149; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5numpy_flatiter = __Pyx_ImportType("numpy", "flatiter", sizeof(PyArrayIterObject), 0); if (unlikely(!__pyx_ptype_5numpy_flatiter)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 159; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5numpy_broadcast = __Pyx_ImportType("numpy", "broadcast", sizeof(PyArrayMultiIterObject), 0); if (unlikely(!__pyx_ptype_5numpy_broadcast)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 163; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5numpy_ndarray = __Pyx_ImportType("numpy", "ndarray", sizeof(PyArrayObject), 0); if (unlikely(!__pyx_ptype_5numpy_ndarray)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 172; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5numpy_ufunc = __Pyx_ImportType("numpy", "ufunc", sizeof(PyUFuncObject), 0); if (unlikely(!__pyx_ptype_5numpy_ufunc)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 849; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  /*--- Function import code ---*/
+  /*--- Execution code ---*/
+
+  /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":32
+ * from libc.stdlib cimport malloc, free, abs, calloc, labs
+ * 
+ * import numpy as np             # <<<<<<<<<<<<<<
+ * cimport numpy as np
+ * cimport cython
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":1
+ * """             # <<<<<<<<<<<<<<
+ * Wrapping code for Oliver Hahn's RamsesRead++
+ * 
+ */
+  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(((PyObject *)__pyx_t_1));
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+  __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
+
+  /* "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/Cython/Includes/numpy.pxd":963
+ *      arr.base = baseptr
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+ *     if arr.base is NULL:
+ *         return None
+ */
+  goto __pyx_L0;
+  __pyx_L1_error:;
+  __Pyx_XDECREF(__pyx_t_1);
+  if (__pyx_m) {
+    __Pyx_AddTraceback("init yt.ramses_reader");
+    Py_DECREF(__pyx_m); __pyx_m = 0;
+  } else if (!PyErr_Occurred()) {
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+  return;
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+  return __pyx_m;
+  #endif
+}
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+/* Runtime support code */
+
+static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name) {
+    PyObject *result;
+    result = PyObject_GetAttr(dict, name);
+    if (!result)
+        PyErr_SetObject(PyExc_NameError, name);
+    return result;
+}
+
+static void __Pyx_RaiseDoubleKeywordsError(
+    const char* func_name,
+    PyObject* kw_name)
+{
+    PyErr_Format(PyExc_TypeError,
+        #if PY_MAJOR_VERSION >= 3
+        "%s() got multiple values for keyword argument '%U'", func_name, kw_name);
+        #else
+        "%s() got multiple values for keyword argument '%s'", func_name,
+        PyString_AS_STRING(kw_name));
+        #endif
+}
+
+static void __Pyx_RaiseArgtupleInvalid(
+    const char* func_name,
+    int exact,
+    Py_ssize_t num_min,
+    Py_ssize_t num_max,
+    Py_ssize_t num_found)
+{
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+
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+        num_expected = num_min;
+        more_or_less = "at least";
+    } else {
+        num_expected = num_max;
+        more_or_less = "at most";
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+    if (exact) {
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+    }
+    number = (num_expected == 1) ? "" : "s";
+    PyErr_Format(PyExc_TypeError,
+        #if PY_VERSION_HEX < 0x02050000
+            "%s() takes %s %d positional argument%s (%d given)",
+        #else
+            "%s() takes %s %zd positional argument%s (%zd given)",
+        #endif
+        func_name, more_or_less, num_expected, number, num_found);
+}
+
+static int __Pyx_ParseOptionalKeywords(
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+    PyObject **argnames[],
+    PyObject *kwds2,
+    PyObject *values[],
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+    const char* function_name)
+{
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+    Py_ssize_t pos = 0;
+    PyObject*** name;
+    PyObject*** first_kw_arg = argnames + num_pos_args;
+
+    while (PyDict_Next(kwds, &pos, &key, &value)) {
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+        while (*name && (**name != key)) name++;
+        if (*name) {
+            values[name-argnames] = value;
+        } else {
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+            if (unlikely(!PyString_CheckExact(key)) && unlikely(!PyString_Check(key))) {
+            #else
+            if (unlikely(!PyUnicode_CheckExact(key)) && unlikely(!PyUnicode_Check(key))) {
+            #endif
+                goto invalid_keyword_type;
+            } else {
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+                    if (PyUnicode_GET_SIZE(**name) == PyUnicode_GET_SIZE(key) &&
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+                    #else
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+                }
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+                } else {
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+                    for (name=argnames; name != first_kw_arg; name++) {
+                        if (**name == key) goto arg_passed_twice;
+                        #if PY_MAJOR_VERSION >= 3
+                        if (PyUnicode_GET_SIZE(**name) == PyUnicode_GET_SIZE(key) &&
+                            PyUnicode_Compare(**name, key) == 0) goto arg_passed_twice;
+                        #else
+                        if (PyString_GET_SIZE(**name) == PyString_GET_SIZE(key) &&
+                            _PyString_Eq(**name, key)) goto arg_passed_twice;
+                        #endif
+                    }
+                    if (kwds2) {
+                        if (unlikely(PyDict_SetItem(kwds2, key, value))) goto bad;
+                    } else {
+                        goto invalid_keyword;
+                    }
+                }
+            }
+        }
+    }
+    return 0;
+arg_passed_twice:
+    __Pyx_RaiseDoubleKeywordsError(function_name, **name);
+    goto bad;
+invalid_keyword_type:
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+        "%s() keywords must be strings", function_name);
+    goto bad;
+invalid_keyword:
+    PyErr_Format(PyExc_TypeError,
+    #if PY_MAJOR_VERSION < 3
+        "%s() got an unexpected keyword argument '%s'",
+        function_name, PyString_AsString(key));
+    #else
+        "%s() got an unexpected keyword argument '%U'",
+        function_name, key);
+    #endif
+bad:
+    return -1;
+}
+
+
+
+static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
+    const char *name, int exact)
+{
+    if (!type) {
+        PyErr_Format(PyExc_SystemError, "Missing type object");
+        return 0;
+    }
+    if (none_allowed && obj == Py_None) return 1;
+    else if (exact) {
+        if (Py_TYPE(obj) == type) return 1;
+    }
+    else {
+        if (PyObject_TypeCheck(obj, type)) return 1;
+    }
+    PyErr_Format(PyExc_TypeError,
+        "Argument '%s' has incorrect type (expected %s, got %s)",
+        name, type->tp_name, Py_TYPE(obj)->tp_name);
+    return 0;
+}
+
+static CYTHON_INLINE int __Pyx_IsLittleEndian(void) {
+  unsigned int n = 1;
+  return *(unsigned char*)(&n) != 0;
+}
+
+typedef struct {
+  __Pyx_StructField root;
+  __Pyx_BufFmt_StackElem* head;
+  size_t fmt_offset;
+  int new_count, enc_count;
+  int is_complex;
+  char enc_type;
+  char packmode;
+} __Pyx_BufFmt_Context;
+
+static void __Pyx_BufFmt_Init(__Pyx_BufFmt_Context* ctx,
+                              __Pyx_BufFmt_StackElem* stack,
+                              __Pyx_TypeInfo* type) {
+  stack[0].field = &ctx->root;
+  stack[0].parent_offset = 0;
+  ctx->root.type = type;
+  ctx->root.name = "buffer dtype";
+  ctx->root.offset = 0;
+  ctx->head = stack;
+  ctx->head->field = &ctx->root;
+  ctx->fmt_offset = 0;
+  ctx->head->parent_offset = 0;
+  ctx->packmode = '@';
+  ctx->new_count = 1;
+  ctx->enc_count = 0;
+  ctx->enc_type = 0;
+  ctx->is_complex = 0;
+  while (type->typegroup == 'S') {
+    ++ctx->head;
+    ctx->head->field = type->fields;
+    ctx->head->parent_offset = 0;
+    type = type->fields->type;
+  }
+}
+
+static int __Pyx_BufFmt_ParseNumber(const char** ts) {
+    int count;
+    const char* t = *ts;
+    if (*t < '0' || *t > '9') {
+      return -1;
+    } else {
+        count = *t++ - '0';
+        while (*t >= '0' && *t < '9') {
+            count *= 10;
+            count += *t++ - '0';
+        }
+    }
+    *ts = t;
+    return count;
+}
+
+static void __Pyx_BufFmt_RaiseUnexpectedChar(char ch) {
+  char msg[] = {ch, 0};
+  PyErr_Format(PyExc_ValueError, "Unexpected format string character: '%s'", msg);
+}
+
+static const char* __Pyx_BufFmt_DescribeTypeChar(char ch, int is_complex) {
+  switch (ch) {
+    case 'b': return "'char'";
+    case 'B': return "'unsigned char'";
+    case 'h': return "'short'";
+    case 'H': return "'unsigned short'";
+    case 'i': return "'int'";
+    case 'I': return "'unsigned int'";
+    case 'l': return "'long'";
+    case 'L': return "'unsigned long'";
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+    case 'Q': return "'unsigned long long'";
+    case 'f': return (is_complex ? "'complex float'" : "'float'");
+    case 'd': return (is_complex ? "'complex double'" : "'double'");
+    case 'g': return (is_complex ? "'complex long double'" : "'long double'");
+    case 'T': return "a struct";
+    case 'O': return "Python object";
+    case 'P': return "a pointer";
+    case 0: return "end";
+    default: return "unparseable format string";
+  }
+}
+
+static size_t __Pyx_BufFmt_TypeCharToStandardSize(char ch, int is_complex) {
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': return 1;
+    case 'h': case 'H': return 2;
+    case 'i': case 'I': case 'l': case 'L': return 4;
+    case 'q': case 'Q': return 8;
+    case 'f': return (is_complex ? 8 : 4);
+    case 'd': return (is_complex ? 16 : 8);
+    case 'g': {
+      PyErr_SetString(PyExc_ValueError, "Python does not define a standard format string size for long double ('g')..");
+      return 0;
+    }
+    case 'O': case 'P': return sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+
+static size_t __Pyx_BufFmt_TypeCharToNativeSize(char ch, int is_complex) {
+  switch (ch) {
+    case 'c': case 'b': case 'B': return 1;
+    case 'h': case 'H': return sizeof(short);
+    case 'i': case 'I': return sizeof(int);
+    case 'l': case 'L': return sizeof(long);
+    #ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(PY_LONG_LONG);
+    #endif
+    case 'f': return sizeof(float) * (is_complex ? 2 : 1);
+    case 'd': return sizeof(double) * (is_complex ? 2 : 1);
+    case 'g': return sizeof(long double) * (is_complex ? 2 : 1);
+    case 'O': case 'P': return sizeof(void*);
+    default: {
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }    
+  }
+}
+
+typedef struct { char c; short x; } __Pyx_st_short;
+typedef struct { char c; int x; } __Pyx_st_int;
+typedef struct { char c; long x; } __Pyx_st_long;
+typedef struct { char c; float x; } __Pyx_st_float;
+typedef struct { char c; double x; } __Pyx_st_double;
+typedef struct { char c; long double x; } __Pyx_st_longdouble;
+typedef struct { char c; void *x; } __Pyx_st_void_p;
+#ifdef HAVE_LONG_LONG
+typedef struct { char c; PY_LONG_LONG x; } __Pyx_s_long_long;
+#endif
+
+static size_t __Pyx_BufFmt_TypeCharToAlignment(char ch, int is_complex) {
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': return 1;
+    case 'h': case 'H': return sizeof(__Pyx_st_short) - sizeof(short);
+    case 'i': case 'I': return sizeof(__Pyx_st_int) - sizeof(int);
+    case 'l': case 'L': return sizeof(__Pyx_st_long) - sizeof(long);
+#ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(__Pyx_s_long_long) - sizeof(PY_LONG_LONG);
+#endif
+    case 'f': return sizeof(__Pyx_st_float) - sizeof(float);
+    case 'd': return sizeof(__Pyx_st_double) - sizeof(double);
+    case 'g': return sizeof(__Pyx_st_longdouble) - sizeof(long double);
+    case 'P': case 'O': return sizeof(__Pyx_st_void_p) - sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+
+static size_t __Pyx_BufFmt_TypeCharToGroup(char ch, int is_complex) {
+  switch (ch) {
+    case 'c': case 'b': case 'h': case 'i': case 'l': case 'q': return 'I';
+    case 'B': case 'H': case 'I': case 'L': case 'Q': return 'U';
+    case 'f': case 'd': case 'g': return (is_complex ? 'C' : 'R');
+    case 'O': return 'O';
+    case 'P': return 'P';
+    default: {
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }    
+  }
+}
+
+static void __Pyx_BufFmt_RaiseExpected(__Pyx_BufFmt_Context* ctx) {
+  if (ctx->head == NULL || ctx->head->field == &ctx->root) {
+    const char* expected;
+    const char* quote;
+    if (ctx->head == NULL) {
+      expected = "end";
+      quote = "";
+    } else {
+      expected = ctx->head->field->type->name;
+      quote = "'";
+    }
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer dtype mismatch, expected %s%s%s but got %s",
+                 quote, expected, quote,
+                 __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex));
+  } else {
+    __Pyx_StructField* field = ctx->head->field;
+    __Pyx_StructField* parent = (ctx->head - 1)->field;
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer dtype mismatch, expected '%s' but got %s in '%s.%s'",
+                 field->type->name, __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex),
+                 parent->type->name, field->name);
+  }
+}
+
+static int __Pyx_BufFmt_ProcessTypeChunk(__Pyx_BufFmt_Context* ctx) {
+  char group;
+  size_t size, offset;
+  if (ctx->enc_type == 0) return 0;
+  group = __Pyx_BufFmt_TypeCharToGroup(ctx->enc_type, ctx->is_complex);
+  do {
+    __Pyx_StructField* field = ctx->head->field;
+    __Pyx_TypeInfo* type = field->type;
+  
+    if (ctx->packmode == '@' || ctx->packmode == '^') {
+      size = __Pyx_BufFmt_TypeCharToNativeSize(ctx->enc_type, ctx->is_complex);
+    } else {
+      size = __Pyx_BufFmt_TypeCharToStandardSize(ctx->enc_type, ctx->is_complex);
+    }
+    if (ctx->packmode == '@') {
+      int align_at = __Pyx_BufFmt_TypeCharToAlignment(ctx->enc_type, ctx->is_complex);
+      int align_mod_offset;
+      if (align_at == 0) return -1;
+      align_mod_offset = ctx->fmt_offset % align_at;
+      if (align_mod_offset > 0) ctx->fmt_offset += align_at - align_mod_offset;
+    }
+
+    if (type->size != size || type->typegroup != group) {
+      if (type->typegroup == 'C' && type->fields != NULL) {
+        /* special case -- treat as struct rather than complex number */
+        size_t parent_offset = ctx->head->parent_offset + field->offset;
+        ++ctx->head;
+        ctx->head->field = type->fields;
+        ctx->head->parent_offset = parent_offset;
+        continue;
+      }
+    
+      __Pyx_BufFmt_RaiseExpected(ctx);
+      return -1;
+    }
+
+    offset = ctx->head->parent_offset + field->offset;
+    if (ctx->fmt_offset != offset) {
+      PyErr_Format(PyExc_ValueError,
+                   "Buffer dtype mismatch; next field is at offset %"PY_FORMAT_SIZE_T"d "
+                   "but %"PY_FORMAT_SIZE_T"d expected", ctx->fmt_offset, offset);
+      return -1;
+    }
+
+    ctx->fmt_offset += size;
+  
+    --ctx->enc_count; /* Consume from buffer string */
+
+    /* Done checking, move to next field, pushing or popping struct stack if needed */
+    while (1) {
+      if (field == &ctx->root) {
+        ctx->head = NULL;
+        if (ctx->enc_count != 0) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return -1;
+        }
+        break; /* breaks both loops as ctx->enc_count == 0 */
+      }
+      ctx->head->field = ++field;
+      if (field->type == NULL) {
+        --ctx->head;
+        field = ctx->head->field;
+        continue;
+      } else if (field->type->typegroup == 'S') {
+        size_t parent_offset = ctx->head->parent_offset + field->offset;
+        if (field->type->fields->type == NULL) continue; /* empty struct */
+        field = field->type->fields;
+        ++ctx->head;
+        ctx->head->field = field;
+        ctx->head->parent_offset = parent_offset;
+        break;
+      } else {
+        break;
+      }
+    }
+  } while (ctx->enc_count);
+  ctx->enc_type = 0;
+  ctx->is_complex = 0;
+  return 0;    
+}
+
+static int __Pyx_BufFmt_FirstPack(__Pyx_BufFmt_Context* ctx) {
+  if (ctx->enc_type != 0 || ctx->packmode != '@') {
+    PyErr_SetString(PyExc_ValueError, "Buffer packing mode currently only allowed at beginning of format string (this is a defect)");
+    return -1;
+  }
+  return 0;
+}
+
+static const char* __Pyx_BufFmt_CheckString(__Pyx_BufFmt_Context* ctx, const char* ts) {
+  int got_Z = 0;
+  while (1) {
+    switch(*ts) {
+      case 0:
+        if (ctx->enc_type != 0 && ctx->head == NULL) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return NULL;
+        }
+        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+        if (ctx->head != NULL) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return NULL;
+        }
+        return ts;
+      case ' ':
+      case 10:
+      case 13:
+        ++ts;
+        break;
+      case '<':
+        if (!__Pyx_IsLittleEndian()) {
+          PyErr_SetString(PyExc_ValueError, "Little-endian buffer not supported on big-endian compiler");
+          return NULL;
+        }
+        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
+        ctx->packmode = '=';
+        ++ts;
+        break;
+      case '>':
+      case '!':
+        if (__Pyx_IsLittleEndian()) {
+          PyErr_SetString(PyExc_ValueError, "Big-endian buffer not supported on little-endian compiler");
+          return NULL;
+        }
+        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
+        ctx->packmode = '=';
+        ++ts;
+        break;
+      case '=':
+      case '@':
+      case '^':
+        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
+        ctx->packmode = *ts++;
+        break;
+      case 'T': /* substruct */
+        {
+          int i;
+          const char* ts_after_sub;
+          int struct_count = ctx->new_count;
+          ctx->new_count = 1;
+          ++ts;
+          if (*ts != '{') {
+            PyErr_SetString(PyExc_ValueError, "Buffer acquisition: Expected '{' after 'T'");
+            return NULL;
+          }
+          ++ts;
+          ts_after_sub = ts;
+          for (i = 0; i != struct_count; ++i) {
+            ts_after_sub = __Pyx_BufFmt_CheckString(ctx, ts);
+            if (!ts_after_sub) return NULL;
+          }
+          ts = ts_after_sub;
+        }
+        break;
+      case '}': /* end of substruct; either repeat or move on */
+        ++ts;
+        return ts;
+      case 'x':
+        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+        ctx->fmt_offset += ctx->new_count;
+        ctx->new_count = 1;
+        ctx->enc_count = 0;
+        ctx->enc_type = 0;
+        ++ts;
+        break;
+      case 'Z':
+        got_Z = 1;
+        ++ts;
+        if (*ts != 'f' && *ts != 'd' && *ts != 'g') {
+          __Pyx_BufFmt_RaiseUnexpectedChar('Z');
+          return NULL;
+        }        /* fall through */
+      case 'c': case 'b': case 'B': case 'h': case 'H': case 'i': case 'I':
+      case 'l': case 'L': case 'q': case 'Q':
+      case 'f': case 'd': case 'g':
+      case 'O':
+        if (ctx->enc_type == *ts && got_Z == ctx->is_complex) {
+          /* Continue pooling same type */
+          ctx->enc_count += ctx->new_count;
+        } else {
+          /* New type */
+          if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+          ctx->enc_count = ctx->new_count;
+          ctx->enc_type = *ts;
+          ctx->is_complex = got_Z;
+        }
+        ++ts;
+        ctx->new_count = 1;
+        got_Z = 0;
+        break;
+      default:
+        {
+          ctx->new_count = __Pyx_BufFmt_ParseNumber(&ts);
+          if (ctx->new_count == -1) { /* First char was not a digit */
+            char msg[2] = { *ts, 0 };
+            PyErr_Format(PyExc_ValueError,
+                         "Does not understand character buffer dtype format string ('%s')", msg);
+            return NULL;
+          }
+        }
+      
+    }
+  }
+}
+
+static CYTHON_INLINE void __Pyx_ZeroBuffer(Py_buffer* buf) {
+  buf->buf = NULL;
+  buf->obj = NULL;
+  buf->strides = __Pyx_zeros;
+  buf->shape = __Pyx_zeros;
+  buf->suboffsets = __Pyx_minusones;
+}
+
+static CYTHON_INLINE int __Pyx_GetBufferAndValidate(Py_buffer* buf, PyObject* obj, __Pyx_TypeInfo* dtype, int flags, int nd, int cast, __Pyx_BufFmt_StackElem* stack) {
+  if (obj == Py_None) {
+    __Pyx_ZeroBuffer(buf);
+    return 0;
+  }
+  buf->buf = NULL;
+  if (__Pyx_GetBuffer(obj, buf, flags) == -1) goto fail;
+  if (buf->ndim != nd) {
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer has wrong number of dimensions (expected %d, got %d)",
+                 nd, buf->ndim);
+    goto fail;
+  }
+  if (!cast) {
+    __Pyx_BufFmt_Context ctx;
+    __Pyx_BufFmt_Init(&ctx, stack, dtype);
+    if (!__Pyx_BufFmt_CheckString(&ctx, buf->format)) goto fail;
+  }
+  if ((unsigned)buf->itemsize != dtype->size) {
+    PyErr_Format(PyExc_ValueError,
+      "Item size of buffer (%"PY_FORMAT_SIZE_T"d byte%s) does not match size of '%s' (%"PY_FORMAT_SIZE_T"d byte%s)",
+      buf->itemsize, (buf->itemsize > 1) ? "s" : "",
+      dtype->name,
+      dtype->size, (dtype->size > 1) ? "s" : "");
+    goto fail;
+  }
+  if (buf->suboffsets == NULL) buf->suboffsets = __Pyx_minusones;
+  return 0;
+fail:;
+  __Pyx_ZeroBuffer(buf);
+  return -1;
+}
+
+static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info) {
+  if (info->buf == NULL) return;
+  if (info->suboffsets == __Pyx_minusones) info->suboffsets = NULL;
+  __Pyx_ReleaseBuffer(info);
+}
+static void __Pyx_RaiseBufferIndexError(int axis) {
+  PyErr_Format(PyExc_IndexError,
+     "Out of bounds on buffer access (axis %d)", axis);
+}
+
+
+static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb) {
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    PyThreadState *tstate = PyThreadState_GET();
+
+    tmp_type = tstate->curexc_type;
+    tmp_value = tstate->curexc_value;
+    tmp_tb = tstate->curexc_traceback;
+    tstate->curexc_type = type;
+    tstate->curexc_value = value;
+    tstate->curexc_traceback = tb;
+    Py_XDECREF(tmp_type);
+    Py_XDECREF(tmp_value);
+    Py_XDECREF(tmp_tb);
+}
+
+static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb) {
+    PyThreadState *tstate = PyThreadState_GET();
+    *type = tstate->curexc_type;
+    *value = tstate->curexc_value;
+    *tb = tstate->curexc_traceback;
+
+    tstate->curexc_type = 0;
+    tstate->curexc_value = 0;
+    tstate->curexc_traceback = 0;
+}
+
+
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
+    if (unlikely(!type)) {
+        PyErr_Format(PyExc_SystemError, "Missing type object");
+        return 0;
+    }
+    if (likely(PyObject_TypeCheck(obj, type)))
+        return 1;
+    PyErr_Format(PyExc_TypeError, "Cannot convert %.200s to %.200s",
+                 Py_TYPE(obj)->tp_name, type->tp_name);
+    return 0;
+}
+
+static void __Pyx_RaiseBufferFallbackError(void) {
+  PyErr_Format(PyExc_ValueError,
+     "Buffer acquisition failed on assignment; and then reacquiring the old buffer failed too!");
+}
+
+
+static CYTHON_INLINE int __Pyx_div_int(int a, int b) {
+    int q = a / b;
+    int r = a - q*b;
+    q -= ((r != 0) & ((r ^ b) < 0));
+    return q;
+}
+
+static CYTHON_INLINE __pyx_t_5numpy_int64_t __Pyx_div___pyx_t_5numpy_int64_t(__pyx_t_5numpy_int64_t a, __pyx_t_5numpy_int64_t b) {
+    __pyx_t_5numpy_int64_t q = a / b;
+    __pyx_t_5numpy_int64_t r = a - q*b;
+    q -= ((r != 0) & ((r ^ b) < 0));
+    return q;
+}
+
+static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void) {
+    PyErr_SetString(PyExc_TypeError, "'NoneType' object is not iterable");
+}
+
+static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index) {
+    PyErr_Format(PyExc_ValueError,
+        #if PY_VERSION_HEX < 0x02050000
+                 "need more than %d value%s to unpack", (int)index,
+        #else
+                 "need more than %zd value%s to unpack", index,
+        #endif
+                 (index == 1) ? "" : "s");
+}
+
+static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected) {
+    PyErr_Format(PyExc_ValueError,
+        #if PY_VERSION_HEX < 0x02050000
+            "too many values to unpack (expected %d)", (int)expected);
+        #else
+            "too many values to unpack (expected %zd)", expected);
+        #endif
+}
+
+static void __Pyx_UnpackTupleError(PyObject *t, Py_ssize_t index) {
+    if (t == Py_None) {
+      __Pyx_RaiseNoneNotIterableError();
+    } else if (PyTuple_GET_SIZE(t) < index) {
+      __Pyx_RaiseNeedMoreValuesError(PyTuple_GET_SIZE(t));
+    } else {
+      __Pyx_RaiseTooManyValuesError(index);
+    }
+}
+
+#if PY_MAJOR_VERSION < 3
+static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags) {
+  #if PY_VERSION_HEX >= 0x02060000
+  if (Py_TYPE(obj)->tp_flags & Py_TPFLAGS_HAVE_NEWBUFFER)
+      return PyObject_GetBuffer(obj, view, flags);
+  #endif
+  if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) return __pyx_pf_5numpy_7ndarray___getbuffer__(obj, view, flags);
+  else {
+  PyErr_Format(PyExc_TypeError, "'%100s' does not have the buffer interface", Py_TYPE(obj)->tp_name);
+  return -1;
+    }
+}
+
+static void __Pyx_ReleaseBuffer(Py_buffer *view) {
+  PyObject* obj = view->obj;
+  if (obj) {
+if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) __pyx_pf_5numpy_7ndarray___releasebuffer__(obj, view);
+    Py_DECREF(obj);
+    view->obj = NULL;
+  }
+}
+
+#endif
+
+static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list) {
+    PyObject *py_import = 0;
+    PyObject *empty_list = 0;
+    PyObject *module = 0;
+    PyObject *global_dict = 0;
+    PyObject *empty_dict = 0;
+    PyObject *list;
+    py_import = __Pyx_GetAttrString(__pyx_b, "__import__");
+    if (!py_import)
+        goto bad;
+    if (from_list)
+        list = from_list;
+    else {
+        empty_list = PyList_New(0);
+        if (!empty_list)
+            goto bad;
+        list = empty_list;
+    }
+    global_dict = PyModule_GetDict(__pyx_m);
+    if (!global_dict)
+        goto bad;
+    empty_dict = PyDict_New();
+    if (!empty_dict)
+        goto bad;
+    module = PyObject_CallFunctionObjArgs(py_import,
+        name, global_dict, empty_dict, list, NULL);
+bad:
+    Py_XDECREF(empty_list);
+    Py_XDECREF(py_import);
+    Py_XDECREF(empty_dict);
+    return module;
+}
+
+#if PY_MAJOR_VERSION < 3
+static PyObject *__Pyx_GetStdout(void) {
+    PyObject *f = PySys_GetObject((char *)"stdout");
+    if (!f) {
+        PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");
+    }
+    return f;
+}
+
+static int __Pyx_Print(PyObject* f, PyObject *arg_tuple, int newline) {
+    PyObject* v;
+    int i;
+
+    if (!f) {
+        if (!(f = __Pyx_GetStdout()))
+            return -1;
+    }
+    for (i=0; i < PyTuple_GET_SIZE(arg_tuple); i++) {
+        if (PyFile_SoftSpace(f, 1)) {
+            if (PyFile_WriteString(" ", f) < 0)
+                return -1;
+        }
+        v = PyTuple_GET_ITEM(arg_tuple, i);
+        if (PyFile_WriteObject(v, f, Py_PRINT_RAW) < 0)
+            return -1;
+        if (PyString_Check(v)) {
+            char *s = PyString_AsString(v);
+            Py_ssize_t len = PyString_Size(v);
+            if (len > 0 &&
+                isspace(Py_CHARMASK(s[len-1])) &&
+                s[len-1] != ' ')
+                    PyFile_SoftSpace(f, 0);
+        }
+    }
+    if (newline) {
+        if (PyFile_WriteString("\n", f) < 0)
+            return -1;
+        PyFile_SoftSpace(f, 0);
+    }
+    return 0;
+}
+
+#else /* Python 3 has a print function */
+
+static int __Pyx_Print(PyObject* stream, PyObject *arg_tuple, int newline) {
+    PyObject* kwargs = 0;
+    PyObject* result = 0;
+    PyObject* end_string;
+    if (unlikely(!__pyx_print)) {
+        __pyx_print = __Pyx_GetAttrString(__pyx_b, "print");
+        if (!__pyx_print)
+            return -1;
+    }
+    if (stream) {
+        kwargs = PyDict_New();
+        if (unlikely(!kwargs))
+            return -1;
+        if (unlikely(PyDict_SetItemString(kwargs, "file", stream) < 0))
+            goto bad;
+        if (!newline) {
+            end_string = PyUnicode_FromStringAndSize(" ", 1);
+            if (unlikely(!end_string))
+                goto bad;
+            if (PyDict_SetItemString(kwargs, "end", end_string) < 0) {
+                Py_DECREF(end_string);
+                goto bad;
+            }
+            Py_DECREF(end_string);
+        }
+    } else if (!newline) {
+        if (unlikely(!__pyx_print_kwargs)) {
+            __pyx_print_kwargs = PyDict_New();
+            if (unlikely(!__pyx_print_kwargs))
+                return -1;
+            end_string = PyUnicode_FromStringAndSize(" ", 1);
+            if (unlikely(!end_string))
+                return -1;
+            if (PyDict_SetItemString(__pyx_print_kwargs, "end", end_string) < 0) {
+                Py_DECREF(end_string);
+                return -1;
+            }
+            Py_DECREF(end_string);
+        }
+        kwargs = __pyx_print_kwargs;
+    }
+    result = PyObject_Call(__pyx_print, arg_tuple, kwargs);
+    if (unlikely(kwargs) && (kwargs != __pyx_print_kwargs))
+        Py_DECREF(kwargs);
+    if (!result)
+        return -1;
+    Py_DECREF(result);
+    return 0;
+bad:
+    if (kwargs != __pyx_print_kwargs)
+        Py_XDECREF(kwargs);
+    return -1;
+}
+
+#endif
+
+static CYTHON_INLINE long __Pyx_pow_long(long b, long e) {
+    long t = b;
+    switch (e) {
+        case 3:
+            t *= b;
+        case 2:
+            t *= b;
+        case 1:
+            return t;
+        case 0:
+            return 1;
+    }
+    if (unlikely(e<0)) return 0;
+    t = 1;
+    while (likely(e)) {
+        t *= (b * (e&1)) | ((~e)&1);    /* 1 or b */
+        b *= b;
+        e >>= 1;
+    }
+    return t;
+}
+
+static CYTHON_INLINE npy_int64 __Pyx_PyInt_from_py_npy_int64(PyObject* x) {
+    const npy_int64 neg_one = (npy_int64)-1, const_zero = (npy_int64)0;
+    const int is_unsigned = const_zero < neg_one;
+    if (sizeof(npy_int64) == sizeof(char)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedChar(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedChar(x);
+    } else if (sizeof(npy_int64) == sizeof(short)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedShort(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedShort(x);
+    } else if (sizeof(npy_int64) == sizeof(int)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedInt(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedInt(x);
+    } else if (sizeof(npy_int64) == sizeof(long)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedLong(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedLong(x);
+    } else if (sizeof(npy_int64) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedLongLong(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedLongLong(x);
+    }  else {
+        npy_int64 val;
+        PyObject *v = __Pyx_PyNumber_Int(x);
+        #if PY_VERSION_HEX < 0x03000000
+        if (likely(v) && !PyLong_Check(v)) {
+            PyObject *tmp = v;
+            v = PyNumber_Long(tmp);
+            Py_DECREF(tmp);
+        }
+        #endif
+        if (likely(v)) {
+            int one = 1; int is_little = (int)*(unsigned char *)&one;
+            unsigned char *bytes = (unsigned char *)&val;
+            int ret = _PyLong_AsByteArray((PyLongObject *)v,
+                                          bytes, sizeof(val),
+                                          is_little, !is_unsigned);
+            Py_DECREF(v);
+            if (likely(!ret))
+                return val;
+        }
+        return (npy_int64)-1;
+    }
+}
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int64(npy_int64 val) {
+    const npy_int64 neg_one = (npy_int64)-1, const_zero = (npy_int64)0;
+    const int is_unsigned = const_zero < neg_one;
+    if ((sizeof(npy_int64) == sizeof(char))  ||
+        (sizeof(npy_int64) == sizeof(short))) {
+        return PyInt_FromLong((long)val);
+    } else if ((sizeof(npy_int64) == sizeof(int)) ||
+               (sizeof(npy_int64) == sizeof(long))) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLong((unsigned long)val);
+        else
+            return PyInt_FromLong((long)val);
+    } else if (sizeof(npy_int64) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
+        else
+            return PyLong_FromLongLong((PY_LONG_LONG)val);
+    } else {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&val;
+        return _PyLong_FromByteArray(bytes, sizeof(npy_int64), 
+                                     little, !is_unsigned);
+    }
+}
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
+      return ::std::complex< float >(x, y);
+    }
+  #else
+    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
+      return x + y*(__pyx_t_float_complex)_Complex_I;
+    }
+  #endif
+#else
+    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
+      __pyx_t_float_complex z;
+      z.real = x;
+      z.imag = y;
+      return z;
+    }
+#endif
+
+#if CYTHON_CCOMPLEX
+#else
+    static CYTHON_INLINE int __Pyx_c_eqf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+       return (a.real == b.real) && (a.imag == b.imag);
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_sumf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        z.real = a.real + b.real;
+        z.imag = a.imag + b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_difff(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        z.real = a.real - b.real;
+        z.imag = a.imag - b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_prodf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        z.real = a.real * b.real - a.imag * b.imag;
+        z.imag = a.real * b.imag + a.imag * b.real;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_quotf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        float denom = b.real * b.real + b.imag * b.imag;
+        z.real = (a.real * b.real + a.imag * b.imag) / denom;
+        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_negf(__pyx_t_float_complex a) {
+        __pyx_t_float_complex z;
+        z.real = -a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    static CYTHON_INLINE int __Pyx_c_is_zerof(__pyx_t_float_complex a) {
+       return (a.real == 0) && (a.imag == 0);
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_conjf(__pyx_t_float_complex a) {
+        __pyx_t_float_complex z;
+        z.real =  a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+/*
+    static CYTHON_INLINE float __Pyx_c_absf(__pyx_t_float_complex z) {
+#if HAVE_HYPOT
+        return hypotf(z.real, z.imag);
+#else
+        return sqrtf(z.real*z.real + z.imag*z.imag);
+#endif
+    }
+*/
+#endif
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
+      return ::std::complex< double >(x, y);
+    }
+  #else
+    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
+      return x + y*(__pyx_t_double_complex)_Complex_I;
+    }
+  #endif
+#else
+    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
+      __pyx_t_double_complex z;
+      z.real = x;
+      z.imag = y;
+      return z;
+    }
+#endif
+
+#if CYTHON_CCOMPLEX
+#else
+    static CYTHON_INLINE int __Pyx_c_eq(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+       return (a.real == b.real) && (a.imag == b.imag);
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_sum(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        z.real = a.real + b.real;
+        z.imag = a.imag + b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_diff(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        z.real = a.real - b.real;
+        z.imag = a.imag - b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_prod(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        z.real = a.real * b.real - a.imag * b.imag;
+        z.imag = a.real * b.imag + a.imag * b.real;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_quot(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        double denom = b.real * b.real + b.imag * b.imag;
+        z.real = (a.real * b.real + a.imag * b.imag) / denom;
+        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_neg(__pyx_t_double_complex a) {
+        __pyx_t_double_complex z;
+        z.real = -a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    static CYTHON_INLINE int __Pyx_c_is_zero(__pyx_t_double_complex a) {
+       return (a.real == 0) && (a.imag == 0);
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_conj(__pyx_t_double_complex a) {
+        __pyx_t_double_complex z;
+        z.real =  a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+/*
+    static CYTHON_INLINE double __Pyx_c_abs(__pyx_t_double_complex z) {
+#if HAVE_HYPOT
+        return hypot(z.real, z.imag);
+#else
+        return sqrt(z.real*z.real + z.imag*z.imag);
+#endif
+    }
+*/
+#endif
+
+#if PY_MAJOR_VERSION < 3
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb) {
+    Py_XINCREF(type);
+    Py_XINCREF(value);
+    Py_XINCREF(tb);
+    /* First, check the traceback argument, replacing None with NULL. */
+    if (tb == Py_None) {
+        Py_DECREF(tb);
+        tb = 0;
+    }
+    else if (tb != NULL && !PyTraceBack_Check(tb)) {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: arg 3 must be a traceback or None");
+        goto raise_error;
+    }
+    /* Next, replace a missing value with None */
+    if (value == NULL) {
+        value = Py_None;
+        Py_INCREF(value);
+    }
+    #if PY_VERSION_HEX < 0x02050000
+    if (!PyClass_Check(type))
+    #else
+    if (!PyType_Check(type))
+    #endif
+    {
+        /* Raising an instance.  The value should be a dummy. */
+        if (value != Py_None) {
+            PyErr_SetString(PyExc_TypeError,
+                "instance exception may not have a separate value");
+            goto raise_error;
+        }
+        /* Normalize to raise <class>, <instance> */
+        Py_DECREF(value);
+        value = type;
+        #if PY_VERSION_HEX < 0x02050000
+            if (PyInstance_Check(type)) {
+                type = (PyObject*) ((PyInstanceObject*)type)->in_class;
+                Py_INCREF(type);
+            }
+            else {
+                type = 0;
+                PyErr_SetString(PyExc_TypeError,
+                    "raise: exception must be an old-style class or instance");
+                goto raise_error;
+            }
+        #else
+            type = (PyObject*) Py_TYPE(type);
+            Py_INCREF(type);
+            if (!PyType_IsSubtype((PyTypeObject *)type, (PyTypeObject *)PyExc_BaseException)) {
+                PyErr_SetString(PyExc_TypeError,
+                    "raise: exception class must be a subclass of BaseException");
+                goto raise_error;
+            }
+        #endif
+    }
+
+    __Pyx_ErrRestore(type, value, tb);
+    return;
+raise_error:
+    Py_XDECREF(value);
+    Py_XDECREF(type);
+    Py_XDECREF(tb);
+    return;
+}
+
+#else /* Python 3+ */
+
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb) {
+    if (tb == Py_None) {
+        tb = 0;
+    } else if (tb && !PyTraceBack_Check(tb)) {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: arg 3 must be a traceback or None");
+        goto bad;
+    }
+    if (value == Py_None)
+        value = 0;
+
+    if (PyExceptionInstance_Check(type)) {
+        if (value) {
+            PyErr_SetString(PyExc_TypeError,
+                "instance exception may not have a separate value");
+            goto bad;
+        }
+        value = type;
+        type = (PyObject*) Py_TYPE(value);
+    } else if (!PyExceptionClass_Check(type)) {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: exception class must be a subclass of BaseException");
+        goto bad;
+    }
+
+    PyErr_SetObject(type, value);
+
+    if (tb) {
+        PyThreadState *tstate = PyThreadState_GET();
+        PyObject* tmp_tb = tstate->curexc_traceback;
+        if (tb != tmp_tb) {
+            Py_INCREF(tb);
+            tstate->curexc_traceback = tb;
+            Py_XDECREF(tmp_tb);
+        }
+    }
+
+bad:
+    return;
+}
+#endif
+
+static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject* x) {
+    const unsigned char neg_one = (unsigned char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned char" :
+                    "value too large to convert to unsigned char");
+            }
+            return (unsigned char)-1;
+        }
+        return (unsigned char)val;
+    }
+    return (unsigned char)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject* x) {
+    const unsigned short neg_one = (unsigned short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned short" :
+                    "value too large to convert to unsigned short");
+            }
+            return (unsigned short)-1;
+        }
+        return (unsigned short)val;
+    }
+    return (unsigned short)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject* x) {
+    const unsigned int neg_one = (unsigned int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned int" :
+                    "value too large to convert to unsigned int");
+            }
+            return (unsigned int)-1;
+        }
+        return (unsigned int)val;
+    }
+    return (unsigned int)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject* x) {
+    const char neg_one = (char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to char" :
+                    "value too large to convert to char");
+            }
+            return (char)-1;
+        }
+        return (char)val;
+    }
+    return (char)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject* x) {
+    const short neg_one = (short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to short" :
+                    "value too large to convert to short");
+            }
+            return (short)-1;
+        }
+        return (short)val;
+    }
+    return (short)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject* x) {
+    const int neg_one = (int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to int" :
+                    "value too large to convert to int");
+            }
+            return (int)-1;
+        }
+        return (int)val;
+    }
+    return (int)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject* x) {
+    const signed char neg_one = (signed char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed char" :
+                    "value too large to convert to signed char");
+            }
+            return (signed char)-1;
+        }
+        return (signed char)val;
+    }
+    return (signed char)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject* x) {
+    const signed short neg_one = (signed short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed short" :
+                    "value too large to convert to signed short");
+            }
+            return (signed short)-1;
+        }
+        return (signed short)val;
+    }
+    return (signed short)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject* x) {
+    const signed int neg_one = (signed int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed int" :
+                    "value too large to convert to signed int");
+            }
+            return (signed int)-1;
+        }
+        return (signed int)val;
+    }
+    return (signed int)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject* x) {
+    const int neg_one = (int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to int" :
+                    "value too large to convert to int");
+            }
+            return (int)-1;
+        }
+        return (int)val;
+    }
+    return (int)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject* x) {
+    const unsigned long neg_one = (unsigned long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to unsigned long");
+            return (unsigned long)-1;
+        }
+        return (unsigned long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to unsigned long");
+                return (unsigned long)-1;
+            }
+            return PyLong_AsUnsignedLong(x);
+        } else {
+            return PyLong_AsLong(x);
+        }
+    } else {
+        unsigned long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (unsigned long)-1;
+        val = __Pyx_PyInt_AsUnsignedLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject* x) {
+    const unsigned PY_LONG_LONG neg_one = (unsigned PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to unsigned PY_LONG_LONG");
+            return (unsigned PY_LONG_LONG)-1;
+        }
+        return (unsigned PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to unsigned PY_LONG_LONG");
+                return (unsigned PY_LONG_LONG)-1;
+            }
+            return PyLong_AsUnsignedLongLong(x);
+        } else {
+            return PyLong_AsLongLong(x);
+        }
+    } else {
+        unsigned PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (unsigned PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsUnsignedLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject* x) {
+    const long neg_one = (long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to long");
+            return (long)-1;
+        }
+        return (long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to long");
+                return (long)-1;
+            }
+            return PyLong_AsUnsignedLong(x);
+        } else {
+            return PyLong_AsLong(x);
+        }
+    } else {
+        long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (long)-1;
+        val = __Pyx_PyInt_AsLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject* x) {
+    const PY_LONG_LONG neg_one = (PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to PY_LONG_LONG");
+            return (PY_LONG_LONG)-1;
+        }
+        return (PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to PY_LONG_LONG");
+                return (PY_LONG_LONG)-1;
+            }
+            return PyLong_AsUnsignedLongLong(x);
+        } else {
+            return PyLong_AsLongLong(x);
+        }
+    } else {
+        PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject* x) {
+    const signed long neg_one = (signed long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to signed long");
+            return (signed long)-1;
+        }
+        return (signed long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to signed long");
+                return (signed long)-1;
+            }
+            return PyLong_AsUnsignedLong(x);
+        } else {
+            return PyLong_AsLong(x);
+        }
+    } else {
+        signed long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (signed long)-1;
+        val = __Pyx_PyInt_AsSignedLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject* x) {
+    const signed PY_LONG_LONG neg_one = (signed PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to signed PY_LONG_LONG");
+            return (signed PY_LONG_LONG)-1;
+        }
+        return (signed PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to signed PY_LONG_LONG");
+                return (signed PY_LONG_LONG)-1;
+            }
+            return PyLong_AsUnsignedLongLong(x);
+        } else {
+            return PyLong_AsLongLong(x);
+        }
+    } else {
+        signed PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (signed PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsSignedLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+#ifndef __PYX_HAVE_RT_ImportType
+#define __PYX_HAVE_RT_ImportType
+static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name,
+    long size, int strict)
+{
+    PyObject *py_module = 0;
+    PyObject *result = 0;
+    PyObject *py_name = 0;
+    char warning[200];
+
+    py_module = __Pyx_ImportModule(module_name);
+    if (!py_module)
+        goto bad;
+    #if PY_MAJOR_VERSION < 3
+    py_name = PyString_FromString(class_name);
+    #else
+    py_name = PyUnicode_FromString(class_name);
+    #endif
+    if (!py_name)
+        goto bad;
+    result = PyObject_GetAttr(py_module, py_name);
+    Py_DECREF(py_name);
+    py_name = 0;
+    Py_DECREF(py_module);
+    py_module = 0;
+    if (!result)
+        goto bad;
+    if (!PyType_Check(result)) {
+        PyErr_Format(PyExc_TypeError, 
+            "%s.%s is not a type object",
+            module_name, class_name);
+        goto bad;
+    }
+    if (!strict && ((PyTypeObject *)result)->tp_basicsize > size) {
+        PyOS_snprintf(warning, sizeof(warning), 
+            "%s.%s size changed, may indicate binary incompatibility",
+            module_name, class_name);
+        #if PY_VERSION_HEX < 0x02050000
+        PyErr_Warn(NULL, warning);
+        #else
+        PyErr_WarnEx(NULL, warning, 0);
+        #endif
+    }
+    else if (((PyTypeObject *)result)->tp_basicsize != size) {
+        PyErr_Format(PyExc_ValueError, 
+            "%s.%s has the wrong size, try recompiling",
+            module_name, class_name);
+        goto bad;
+    }
+    return (PyTypeObject *)result;
+bad:
+    Py_XDECREF(py_module);
+    Py_XDECREF(result);
+    return 0;
+}
+#endif
+
+#ifndef __PYX_HAVE_RT_ImportModule
+#define __PYX_HAVE_RT_ImportModule
+static PyObject *__Pyx_ImportModule(const char *name) {
+    PyObject *py_name = 0;
+    PyObject *py_module = 0;
+
+    #if PY_MAJOR_VERSION < 3
+    py_name = PyString_FromString(name);
+    #else
+    py_name = PyUnicode_FromString(name);
+    #endif
+    if (!py_name)
+        goto bad;
+    py_module = PyImport_Import(py_name);
+    Py_DECREF(py_name);
+    return py_module;
+bad:
+    Py_XDECREF(py_name);
+    return 0;
+}
+#endif
+
+#include "compile.h"
+#include "frameobject.h"
+#include "traceback.h"
+
+static void __Pyx_AddTraceback(const char *funcname) {
+    PyObject *py_srcfile = 0;
+    PyObject *py_funcname = 0;
+    PyObject *py_globals = 0;
+    PyCodeObject *py_code = 0;
+    PyFrameObject *py_frame = 0;
+
+    #if PY_MAJOR_VERSION < 3
+    py_srcfile = PyString_FromString(__pyx_filename);
+    #else
+    py_srcfile = PyUnicode_FromString(__pyx_filename);
+    #endif
+    if (!py_srcfile) goto bad;
+    if (__pyx_clineno) {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, __pyx_clineno);
+        #else
+        py_funcname = PyUnicode_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, __pyx_clineno);
+        #endif
+    }
+    else {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromString(funcname);
+        #else
+        py_funcname = PyUnicode_FromString(funcname);
+        #endif
+    }
+    if (!py_funcname) goto bad;
+    py_globals = PyModule_GetDict(__pyx_m);
+    if (!py_globals) goto bad;
+    py_code = PyCode_New(
+        0,            /*int argcount,*/
+        #if PY_MAJOR_VERSION >= 3
+        0,            /*int kwonlyargcount,*/
+        #endif
+        0,            /*int nlocals,*/
+        0,            /*int stacksize,*/
+        0,            /*int flags,*/
+        __pyx_empty_bytes, /*PyObject *code,*/
+        __pyx_empty_tuple,  /*PyObject *consts,*/
+        __pyx_empty_tuple,  /*PyObject *names,*/
+        __pyx_empty_tuple,  /*PyObject *varnames,*/
+        __pyx_empty_tuple,  /*PyObject *freevars,*/
+        __pyx_empty_tuple,  /*PyObject *cellvars,*/
+        py_srcfile,   /*PyObject *filename,*/
+        py_funcname,  /*PyObject *name,*/
+        __pyx_lineno,   /*int firstlineno,*/
+        __pyx_empty_bytes  /*PyObject *lnotab*/
+    );
+    if (!py_code) goto bad;
+    py_frame = PyFrame_New(
+        PyThreadState_GET(), /*PyThreadState *tstate,*/
+        py_code,             /*PyCodeObject *code,*/
+        py_globals,          /*PyObject *globals,*/
+        0                    /*PyObject *locals*/
+    );
+    if (!py_frame) goto bad;
+    py_frame->f_lineno = __pyx_lineno;
+    PyTraceBack_Here(py_frame);
+bad:
+    Py_XDECREF(py_srcfile);
+    Py_XDECREF(py_funcname);
+    Py_XDECREF(py_code);
+    Py_XDECREF(py_frame);
+}
+
+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
+    while (t->p) {
+        #if PY_MAJOR_VERSION < 3
+        if (t->is_unicode) {
+            *t->p = PyUnicode_DecodeUTF8(t->s, t->n - 1, NULL);
+        } else if (t->intern) {
+            *t->p = PyString_InternFromString(t->s);
+        } else {
+            *t->p = PyString_FromStringAndSize(t->s, t->n - 1);
+        }
+        #else  /* Python 3+ has unicode identifiers */
+        if (t->is_unicode | t->is_str) {
+            if (t->intern) {
+                *t->p = PyUnicode_InternFromString(t->s);
+            } else if (t->encoding) {
+                *t->p = PyUnicode_Decode(t->s, t->n - 1, t->encoding, NULL);
+            } else {
+                *t->p = PyUnicode_FromStringAndSize(t->s, t->n - 1);
+            }
+        } else {
+            *t->p = PyBytes_FromStringAndSize(t->s, t->n - 1);
+        }
+        #endif
+        if (!*t->p)
+            return -1;
+        ++t;
+    }
+    return 0;
+}
+
+/* Type Conversion Functions */
+
+static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject* x) {
+   int is_true = x == Py_True;
+   if (is_true | (x == Py_False) | (x == Py_None)) return is_true;
+   else return PyObject_IsTrue(x);
+}
+
+static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x) {
+  PyNumberMethods *m;
+  const char *name = NULL;
+  PyObject *res = NULL;
+#if PY_VERSION_HEX < 0x03000000
+  if (PyInt_Check(x) || PyLong_Check(x))
+#else
+  if (PyLong_Check(x))
+#endif
+    return Py_INCREF(x), x;
+  m = Py_TYPE(x)->tp_as_number;
+#if PY_VERSION_HEX < 0x03000000
+  if (m && m->nb_int) {
+    name = "int";
+    res = PyNumber_Int(x);
+  }
+  else if (m && m->nb_long) {
+    name = "long";
+    res = PyNumber_Long(x);
+  }
+#else
+  if (m && m->nb_int) {
+    name = "int";
+    res = PyNumber_Long(x);
+  }
+#endif
+  if (res) {
+#if PY_VERSION_HEX < 0x03000000
+    if (!PyInt_Check(res) && !PyLong_Check(res)) {
+#else
+    if (!PyLong_Check(res)) {
+#endif
+      PyErr_Format(PyExc_TypeError,
+                   "__%s__ returned non-%s (type %.200s)",
+                   name, name, Py_TYPE(res)->tp_name);
+      Py_DECREF(res);
+      return NULL;
+    }
+  }
+  else if (!PyErr_Occurred()) {
+    PyErr_SetString(PyExc_TypeError,
+                    "an integer is required");
+  }
+  return res;
+}
+
+static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject* b) {
+  Py_ssize_t ival;
+  PyObject* x = PyNumber_Index(b);
+  if (!x) return -1;
+  ival = PyInt_AsSsize_t(x);
+  Py_DECREF(x);
+  return ival;
+}
+
+static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t ival) {
+#if PY_VERSION_HEX < 0x02050000
+   if (ival <= LONG_MAX)
+       return PyInt_FromLong((long)ival);
+   else {
+       unsigned char *bytes = (unsigned char *) &ival;
+       int one = 1; int little = (int)*(unsigned char*)&one;
+       return _PyLong_FromByteArray(bytes, sizeof(size_t), little, 0);
+   }
+#else
+   return PyInt_FromSize_t(ival);
+#endif
+}
+
+static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject* x) {
+   unsigned PY_LONG_LONG val = __Pyx_PyInt_AsUnsignedLongLong(x);
+   if (unlikely(val == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())) {
+       return (size_t)-1;
+   } else if (unlikely(val != (unsigned PY_LONG_LONG)(size_t)val)) {
+       PyErr_SetString(PyExc_OverflowError,
+                       "value too large to convert to size_t");
+       return (size_t)-1;
+   }
+   return (size_t)val;
+}
+
+
+#endif /* Py_PYTHON_H */
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/frontends/ramses/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/frontends/ramses/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('ramses',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/frontends/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/frontends/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+import setuptools
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('frontends',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    config.add_subpackage("chombo")
+    config.add_subpackage("enzo")
+    config.add_subpackage("flash")
+    config.add_subpackage("orion")
+    config.add_subpackage("ramses")
+    config.add_subpackage("tiger")
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/frontends/tiger/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/frontends/tiger/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('tiger',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/logger.py
--- a/yt/logger.py	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,108 +0,0 @@
-"""
-Logging facility for yt
-Will initialize everything, and associate one with each module
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2007-2009 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-import logging, os
-import logging.handlers as handlers
-from yt.config import ytcfg
-
-# This next bit is grabbed from:
-# http://stackoverflow.com/questions/384076/how-can-i-make-the-python-logging-output-to-be-colored
-def add_coloring_to_emit_ansi(fn):
-    # add methods we need to the class
-    def new(*args):
-        levelno = args[1].levelno
-        if(levelno>=50):
-            color = '\x1b[31m' # red
-        elif(levelno>=40):
-            color = '\x1b[31m' # red
-        elif(levelno>=30):
-            color = '\x1b[33m' # yellow
-        elif(levelno>=20):
-            color = '\x1b[32m' # green 
-        elif(levelno>=10):
-            color = '\x1b[35m' # pink
-        else:
-            color = '\x1b[0m' # normal
-        args[1].msg = color + args[1].msg +  '\x1b[0m'  # normal
-        #print "after"
-        return fn(*args)
-    return new
-
-if ytcfg.getboolean("yt","coloredlogs"):
-    logging.StreamHandler.emit = add_coloring_to_emit_ansi(logging.StreamHandler.emit)
-
-level = min(max(ytcfg.getint("yt", "loglevel"), 0), 50)
-fstring = "%(name)-10s %(levelname)-10s %(asctime)s %(message)s"
-logging.basicConfig(
-    format=fstring,
-    level=level
-)
-
-f = logging.Formatter("%(levelname)-10s %(asctime)s %(message)s")
-
-rootLogger = logging.getLogger()
-
-ytLogger = logging.getLogger("yt")
-ytLogger.debug("Set log level to %s", level)
-
-fidoLogger = logging.getLogger("yt.fido")
-ravenLogger = logging.getLogger("yt.raven")
-lagosLogger = logging.getLogger("yt.lagos")
-enkiLogger = logging.getLogger("yt.enki")
-deliveratorLogger = logging.getLogger("yt.deliverator")
-reasonLogger = logging.getLogger("yt.reason")
-
-# Maybe some day we'll make this more configurable...  unfortunately, for now,
-# we preserve thread-safety by opening in the current directory.
-
-mb = 10*1024*1024
-bc = 10
-
-loggers = []
-file_handlers = []
-
-if ytcfg.getboolean("yt","logfile") and os.access(".", os.W_OK):
-    log_file_name = ytcfg.get("yt","LogFileName")
-    ytFileHandler = handlers.RotatingFileHandler(log_file_name,
-                                             maxBytes=mb, backupCount=bc)
-    k = logging.Formatter(fstring)
-    ytFileHandler.setFormatter(k)
-    ytLogger.addHandler(ytFileHandler)
-    loggers.append(ytLogger)
-    file_handlers.append(ytFileHandler)
-
-def disable_stream_logging():
-    # We just remove the root logger's handlers
-    for handler in rootLogger.handlers:
-        if isinstance(handler, logging.StreamHandler):
-            rootLogger.removeHandler(handler)
-
-def disable_file_logging():
-    for logger, handler in zip(loggers, file_handlers):
-        logger.removeHandler(handler)
-
-if ytcfg.getboolean("yt","suppressStreamLogging"):
-    disable_stream_logging()
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/parallel_tools/__init__.py
--- a/yt/parallel_tools/__init__.py	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,27 +0,0 @@
-"""
-Tools for parallelism.
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-from yt.lagos.ParallelTools import ParallelAnalysisInterface
-from distributed_object_collection import DistributedObjectCollection
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/parallel_tools/distributed_object_collection.py
--- a/yt/parallel_tools/distributed_object_collection.py	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,135 +0,0 @@
-"""
-A simple distributed object mechanism, for storing array-heavy objects.
-Meant to be subclassed.
-
-Author: Matthew Turk <matthewturk@gmail.com>
-Affiliation: KIPAC/SLAC/Stanford
-Homepage: http://yt.enzotools.org/
-License:
-  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
-
-  This file is part of yt.
-
-  yt is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-"""
-
-import numpy as na
-from yt.funcs import *
-from yt.parallel_tools import ParallelAnalysisInterface
-from itertools import izip
-
-class DistributedObjectCollection(ParallelAnalysisInterface):
-    valid = True
-
-    def _get_object_info(self):
-        pass
-
-    def _set_object_info(self):
-        pass
-
-    def join_lists(self):
-        info_dict = self._get_object_info()
-        info_dict = self._mpi_catdict(info_dict)
-        self._set_object_info(info_dict)
-
-    def _collect_objects(self, desired_indices):
-        # We figure out which indices belong to which processor,
-        # then we pack them up, and we send a list to each processor.
-        request_count = []
-        owners = self._object_owners[desired_indices]
-        mylog.debug("Owner list: %s", na.unique1d(owners))
-        # Even if we have a million bricks, this should not take long.
-        s = self._mpi_get_size()
-        m = self._mpi_get_rank()
-        requests = dict( ( (i, []) for i in xrange(s) ) )
-        for i, p in izip(desired_indices, owners):
-            requests[p].append(i)
-        for p in sorted(requests):
-            requests[p] = na.array(requests[p], dtype='int64')
-            request_count.append(len(requests[p]))
-        size = len(request_count)
-        mylog.debug("Requesting: %s", request_count)
-        request_count = na.array(request_count, dtype='int64')
-        # Now we distribute our requests to all the processors.
-        # This is two-pass.  One to get the length of the arrays.  The second
-        # pass is to get the actual indices themselves.
-        request_count = self._mpi_joindict({m : request_count})
-        # Now we have our final array of requests, with arrangement
-        # (Nproc,Nproc).  First index corresponds to requesting proc, second to
-        # sending.  So [them,us] = 5 means we owe 5, whereas [us, them] means
-        # we are owed.
-        send_hooks = []
-        dsend_buffers, dsend_hooks = [], []
-        recv_hooks, recv_buffers = [], []
-        drecv_buffers, drecv_hooks = [], []
-        # We post our index-list and data receives from each processor.
-        mylog.debug("Posting data buffer receives")
-        proc_hooks = {}
-        for p, request_from in request_count.items():
-            if p == m: continue
-            size = request_from[m]
-            #if size == 0: continue
-            # We post receives of the grids we *asked* for.
-            # Note that indices into this are not necessarily processor ids.
-            # So we store.  This has to go before the appends or it's an
-            # off-by-one.
-            mylog.debug("Setting up index buffer of size %s for receive from %s",
-                        size, p)
-            proc_hooks[len(drecv_buffers)] = p
-            drecv_buffers.append(self._create_buffer(requests[p]))
-            drecv_hooks.append(self._mpi_Irecv_double(drecv_buffers[-1], p, 1))
-            recv_buffers.append(na.zeros(size, dtype='int64'))
-            # Our index list goes on 0, our buffer goes on 1.  We know how big
-            # the index list will be, now.
-            recv_hooks.append(self._mpi_Irecv_long(recv_buffers[-1], p, 0))
-        # Send our index lists into hte waiting buffers
-        mylog.debug("Sending index lists")
-        for p, ind_list in requests.items():
-            if p == m: continue
-            if len(ind_list) == 0: continue
-            # Now, we actually send our index lists.
-            send_hooks.append(self._mpi_Isend_long(ind_list, p, 0))
-        # Now we post receives for all of the data buffers.
-        mylog.debug("Sending data")
-        for i in self._mpi_Request_Waititer(recv_hooks):
-            # We get back the index, which here is identical to the processor
-            # number doing the send.  At this point, we can post our receives.
-            p = proc_hooks[i]
-            mylog.debug("Processing from %s", p)
-            ind_list = recv_buffers[i]
-            dsend_buffers.append(self._create_buffer(ind_list))
-            self._pack_buffer(ind_list, dsend_buffers[-1])
-            dsend_hooks.append(self._mpi_Isend_double(
-                dsend_buffers[-1], p, 1))
-        mylog.debug("Waiting on data receives: %s", len(drecv_hooks))
-        for i in self._mpi_Request_Waititer(drecv_hooks):
-            mylog.debug("Unpacking from %s", proc_hooks[i])
-            # Now we have to unpack our buffers
-            # Our key into this is actually the request for the processor
-            # number.
-            p = proc_hooks[i]
-            self._unpack_buffer(requests[p], drecv_buffers[i])
-        mylog.debug("Finalizing sends: %s", len(dsend_hooks))
-        for i in self._mpi_Request_Waititer(dsend_hooks):
-            continue
-
-    def _create_buffer(self, ind_list):
-        pass
-
-    def _pack_buffer(self, ind_list):
-        pass
-
-    def _unpack_buffer(self, ind_list, my_buffer):
-        pass
-
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/physical_constants.py
--- a/yt/physical_constants.py	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,53 +0,0 @@
-#
-# Physical Constants and Units Conversion Factors
-#
-
-# Masses
-mass_hydrogen_cgs = 1.67e-24 # g
-mass_electron_cgs = 9.11e-28 # g
-# Velocities
-speed_of_light_cgs = 2.99792458e10 # cm/s, exact
-
-# Cross Sections
-cross_section_thompson_cgs = 6.65e-25 # cm^2
-
-# Physical Constants
-boltzmann_constant_cgs = 1.3806504e-16 # erg K^-1
-gravitational_constant_cgs  = 6.67428e-8 # cm^3 g^-1 s^-2
-planck_constant_cgs   = 6.62606896e-27 # erg s
-rho_crit_now = 1.8788e-29 # g times h^2 (critical mass for closure, Cosmology)
-
-# Misc. Approximations
-mass_mean_atomic_cosmology = 1.22
-mass_mean_atomic_galactic = 2.3
-
-# Conversion Factors:  X au * mpc_per_au = Y au
-# length
-mpc_per_mpc   = 1
-mpc_per_kpc   = 1e-3
-mpc_per_pc    = 1e-6
-mpc_per_au    = 4.847e-12
-mpc_per_rsun  = 2.253e-14
-mpc_per_miles = 5.216e-20
-mpc_per_cm    = 3.24e-25
-km_per_pc     = 1.3806504e13 
-km_per_m      = 1e-3
-km_per_cm     = 1e-5
-
-m_per_fpc     = 0.0324077649
-
-au_per_mpc    = 2.063e11
-rsun_per_mpc  = 4.43664e13
-miles_per_mpc = 1.917e19
-cm_per_mpc    = 3.0857e24
-cm_per_km     = 1e5
-pc_per_km     = 3.24e-14
-pc_per_cm     = 3.24e-19
-#Short cuts
-G = gravitational_constant_cgs
-me = mass_electron_cgs
-mp = mass_hydrogen_cgs
-clight = speed_of_light_cgs
-kboltz = boltzmann_constant_cgs
-hcgs = planck_constant_cgs
-sigma_thompson = cross_section_thompson_cgs
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/ramses_reader.cpp
--- a/yt/ramses_reader.cpp	Wed Aug 25 18:03:39 2010 -0600
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,11701 +0,0 @@
-/* Generated by Cython 0.13.beta0 on Tue Aug 10 15:34:03 2010 */
-
-#define PY_SSIZE_T_CLEAN
-#include "Python.h"
-#ifndef Py_PYTHON_H
-    #error Python headers needed to compile C extensions, please install development version of Python.
-#else
-
-#include <stddef.h> /* For offsetof */
-#ifndef offsetof
-#define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
-#endif
-
-#if !defined(WIN32) && !defined(MS_WINDOWS)
-  #ifndef __stdcall
-    #define __stdcall
-  #endif
-  #ifndef __cdecl
-    #define __cdecl
-  #endif
-  #ifndef __fastcall
-    #define __fastcall
-  #endif
-#endif
-
-#ifndef DL_IMPORT
-  #define DL_IMPORT(t) t
-#endif
-#ifndef DL_EXPORT
-  #define DL_EXPORT(t) t
-#endif
-
-#ifndef PY_LONG_LONG
-  #define PY_LONG_LONG LONG_LONG
-#endif
-
-#if PY_VERSION_HEX < 0x02040000
-  #define METH_COEXIST 0
-  #define PyDict_CheckExact(op) (Py_TYPE(op) == &PyDict_Type)
-  #define PyDict_Contains(d,o)   PySequence_Contains(d,o)
-#endif
-
-#if PY_VERSION_HEX < 0x02050000
-  typedef int Py_ssize_t;
-  #define PY_SSIZE_T_MAX INT_MAX
-  #define PY_SSIZE_T_MIN INT_MIN
-  #define PY_FORMAT_SIZE_T ""
-  #define PyInt_FromSsize_t(z) PyInt_FromLong(z)
-  #define PyInt_AsSsize_t(o)   PyInt_AsLong(o)
-  #define PyNumber_Index(o)    PyNumber_Int(o)
-  #define PyIndex_Check(o)     PyNumber_Check(o)
-  #define PyErr_WarnEx(category, message, stacklevel) PyErr_Warn(category, message)
-#endif
-
-#if PY_VERSION_HEX < 0x02060000
-  #define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
-  #define Py_TYPE(ob)   (((PyObject*)(ob))->ob_type)
-  #define Py_SIZE(ob)   (((PyVarObject*)(ob))->ob_size)
-  #define PyVarObject_HEAD_INIT(type, size) \
-          PyObject_HEAD_INIT(type) size,
-  #define PyType_Modified(t)
-
-  typedef struct {
-     void *buf;
-     PyObject *obj;
-     Py_ssize_t len;
-     Py_ssize_t itemsize;
-     int readonly;
-     int ndim;
-     char *format;
-     Py_ssize_t *shape;
-     Py_ssize_t *strides;
-     Py_ssize_t *suboffsets;
-     void *internal;
-  } Py_buffer;
-
-  #define PyBUF_SIMPLE 0
-  #define PyBUF_WRITABLE 0x0001
-  #define PyBUF_FORMAT 0x0004
-  #define PyBUF_ND 0x0008
-  #define PyBUF_STRIDES (0x0010 | PyBUF_ND)
-  #define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
-  #define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
-  #define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
-  #define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
-
-#endif
-
-#if PY_MAJOR_VERSION < 3
-  #define __Pyx_BUILTIN_MODULE_NAME "__builtin__"
-#else
-  #define __Pyx_BUILTIN_MODULE_NAME "builtins"
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define Py_TPFLAGS_CHECKTYPES 0
-  #define Py_TPFLAGS_HAVE_INDEX 0
-#endif
-
-#if (PY_VERSION_HEX < 0x02060000) || (PY_MAJOR_VERSION >= 3)
-  #define Py_TPFLAGS_HAVE_NEWBUFFER 0
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define PyBaseString_Type            PyUnicode_Type
-  #define PyStringObject               PyUnicodeObject
-  #define PyString_Type                PyUnicode_Type
-  #define PyString_Check               PyUnicode_Check
-  #define PyString_CheckExact          PyUnicode_CheckExact
-#endif
-
-#if PY_VERSION_HEX < 0x02060000
-  #define PyBytesObject                PyStringObject
-  #define PyBytes_Type                 PyString_Type
-  #define PyBytes_Check                PyString_Check
-  #define PyBytes_CheckExact           PyString_CheckExact
-  #define PyBytes_FromString           PyString_FromString
-  #define PyBytes_FromStringAndSize    PyString_FromStringAndSize
-  #define PyBytes_FromFormat           PyString_FromFormat
-  #define PyBytes_DecodeEscape         PyString_DecodeEscape
-  #define PyBytes_AsString             PyString_AsString
-  #define PyBytes_AsStringAndSize      PyString_AsStringAndSize
-  #define PyBytes_Size                 PyString_Size
-  #define PyBytes_AS_STRING            PyString_AS_STRING
-  #define PyBytes_GET_SIZE             PyString_GET_SIZE
-  #define PyBytes_Repr                 PyString_Repr
-  #define PyBytes_Concat               PyString_Concat
-  #define PyBytes_ConcatAndDel         PyString_ConcatAndDel
-  #define PySet_Check(obj)             PyObject_TypeCheck(obj, &PySet_Type)
-  #define PyFrozenSet_Check(obj)       PyObject_TypeCheck(obj, &PyFrozenSet_Type)
-#endif
-
-#ifndef PySet_CheckExact
-#  define PySet_CheckExact(obj)          (Py_TYPE(obj) == &PySet_Type)
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define PyInt_Type                   PyLong_Type
-  #define PyInt_Check(op)              PyLong_Check(op)
-  #define PyInt_CheckExact(op)         PyLong_CheckExact(op)
-  #define PyInt_FromString             PyLong_FromString
-  #define PyInt_FromUnicode            PyLong_FromUnicode
-  #define PyInt_FromLong               PyLong_FromLong
-  #define PyInt_FromSize_t             PyLong_FromSize_t
-  #define PyInt_FromSsize_t            PyLong_FromSsize_t
-  #define PyInt_AsLong                 PyLong_AsLong
-  #define PyInt_AS_LONG                PyLong_AS_LONG
-  #define PyInt_AsSsize_t              PyLong_AsSsize_t
-  #define PyInt_AsUnsignedLongMask     PyLong_AsUnsignedLongMask
-  #define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_TrueDivide(x,y)
-  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceTrueDivide(x,y)
-#else
-  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_Divide(x,y)
-  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceDivide(x,y)
-#endif
-
-#if PY_MAJOR_VERSION >= 3
-  #define PyMethod_New(func, self, klass) ((self) ? PyMethod_New(func, self) : PyInstanceMethod_New(func))
-#endif
-
-#if PY_VERSION_HEX < 0x02050000
-  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),((char *)(n)))
-  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),((char *)(n)),(a))
-  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),((char *)(n)))
-#else
-  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),(n))
-  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),(n),(a))
-  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),(n))
-#endif
-
-#if PY_VERSION_HEX < 0x02050000
-  #define __Pyx_NAMESTR(n) ((char *)(n))
-  #define __Pyx_DOCSTR(n)  ((char *)(n))
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-  #define __Pyx_NAMESTR(n) (n)
-  #define __Pyx_DOCSTR(n)  (n)
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-#ifdef __cplusplus
-#define __PYX_EXTERN_C extern "C"
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-#define __PYX_EXTERN_C extern
-#endif
-
-#if defined(WIN32) || defined(MS_WINDOWS)
-#define _USE_MATH_DEFINES
-#endif
-#include <math.h>
-#define __PYX_HAVE_API__yt__ramses_reader
-#include "stdlib.h"
-#include "stdio.h"
-#include "numpy/arrayobject.h"
-#include "numpy/ufuncobject.h"
-#include <vector>
-#include <map>
-#include "string"
-#include "RAMSES_typedefs.h"
-#include "RAMSES_info.hh"
-#include "RAMSES_amr_data.hh"
-
-/* inline attribute */
-#ifndef CYTHON_INLINE
-  #if defined(__GNUC__)
-    #define CYTHON_INLINE __inline__
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-#     define CYTHON_UNUSED __attribute__ ((__unused__)) 
-#   else
-#     define CYTHON_UNUSED
-#   endif
-# elif defined(__ICC) || defined(__INTEL_COMPILER)
-#   define CYTHON_UNUSED __attribute__ ((__unused__)) 
-# else
-#   define CYTHON_UNUSED 
-# endif
-#endif
-
-typedef struct {PyObject **p; char *s; const long n; const char* encoding; const char is_unicode; const char is_str; const char intern; } __Pyx_StringTabEntry; /*proto*/
-
-
-/* Type Conversion Predeclarations */
-
-#define __Pyx_PyBytes_FromUString(s) PyBytes_FromString((char*)s)
-#define __Pyx_PyBytes_AsUString(s)   ((unsigned char*) PyBytes_AsString(s))
-
-#define __Pyx_PyBool_FromLong(b) ((b) ? (Py_INCREF(Py_True), Py_True) : (Py_INCREF(Py_False), Py_False))
-static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject*);
-static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x);
-
-static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject*);
-static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t);
-static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject*);
-
-#define __pyx_PyFloat_AsDouble(x) (PyFloat_CheckExact(x) ? PyFloat_AS_DOUBLE(x) : PyFloat_AsDouble(x))
-
-
-#ifdef __GNUC__
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-#define unlikely(x) __builtin_expect(!!(x), 0)
-#else /* __GNUC__ > 2 ... */
-#define likely(x)   (x)
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-#endif /* __GNUC__ > 2 ... */
-#else /* __GNUC__ */
-#define likely(x)   (x)
-#define unlikely(x) (x)
-#endif /* __GNUC__ */
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-static PyObject *__pyx_m;
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-static PyObject *__pyx_empty_tuple;
-static PyObject *__pyx_empty_bytes;
-static int __pyx_lineno;
-static int __pyx_clineno = 0;
-static const char * __pyx_cfilenm= __FILE__;
-static const char *__pyx_filename;
-
-
-#if !defined(CYTHON_CCOMPLEX)
-  #if defined(__cplusplus)
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-  #else
-    #define CYTHON_CCOMPLEX 0
-  #endif
-#endif
-
-#if CYTHON_CCOMPLEX
-  #ifdef __cplusplus
-    #include <complex>
-  #else
-    #include <complex.h>
-  #endif
-#endif
-
-#if CYTHON_CCOMPLEX && !defined(__cplusplus) && defined(__sun__) && defined(__GNUC__)
-  #undef _Complex_I
-  #define _Complex_I 1.0fj
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-
-static const char *__pyx_f[] = {
-  "ramses_reader.pyx",
-  "numpy.pxd",
-};
-
-typedef npy_int8 __pyx_t_5numpy_int8_t;
-
-typedef npy_int16 __pyx_t_5numpy_int16_t;
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-typedef npy_int32 __pyx_t_5numpy_int32_t;
-
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- *                         offj = dj - start_index[1]             # <<<<<<<<<<<<<<
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-        __Pyx_RaiseBufferIndexError(__pyx_t_54);
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- *                 if i0 < self.left_edge[0]: continue             # <<<<<<<<<<<<<<
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- *                 for l1 in range(grid_dimensions[gi, 1]):
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- *                 if i0 >= self.right_edge[0]: break             # <<<<<<<<<<<<<<
- *                 for l1 in range(grid_dimensions[gi, 1]):
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- */
-      __pyx_t_16 = (__pyx_v_i0 >= (((struct __pyx_obj_2yt_13ramses_reader_ProtoSubgrid *)__pyx_v_self)->right_edge[0]));
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-        goto __pyx_L21;
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- *                 if i0 >= self.right_edge[0]: break
- *                 for l1 in range(grid_dimensions[gi, 1]):             # <<<<<<<<<<<<<<
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-      __pyx_t_56 = -1;
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-        __Pyx_RaiseBufferIndexError(__pyx_t_56);
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-      __pyx_t_57 = (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_grid_dimensions.buf, __pyx_t_54, __pyx_bstride_0_grid_dimensions, __pyx_t_55, __pyx_bstride_1_grid_dimensions));
-      for (__pyx_t_56 = 0; __pyx_t_56 < __pyx_t_57; __pyx_t_56+=1) {
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- *                     i1 = left_edges[gi, 1] + l1             # <<<<<<<<<<<<<<
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-        __pyx_t_60 = -1;
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- *                     if i1 < self.left_edge[1]: continue             # <<<<<<<<<<<<<<
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- */
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-          goto __pyx_L24;
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- *                     if i1 >= self.right_edge[1]: break             # <<<<<<<<<<<<<<
- *                     for l2 in range(grid_dimensions[gi, 2]):
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- */
-        __pyx_t_16 = (__pyx_v_i1 >= (((struct __pyx_obj_2yt_13ramses_reader_ProtoSubgrid *)__pyx_v_self)->right_edge[1]));
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-          goto __pyx_L25;
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-        __pyx_L25:;
-
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- *                     for l2 in range(grid_dimensions[gi, 2]):             # <<<<<<<<<<<<<<
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-        __pyx_t_61 = 2;
-        __pyx_t_62 = -1;
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-        if (unlikely(__pyx_t_62 != -1)) {
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-        __pyx_t_63 = (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_grid_dimensions.buf, __pyx_t_60, __pyx_bstride_0_grid_dimensions, __pyx_t_61, __pyx_bstride_1_grid_dimensions));
-        for (__pyx_t_62 = 0; __pyx_t_62 < __pyx_t_63; __pyx_t_62+=1) {
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- *                         i2 = left_edges[gi, 2] + l2             # <<<<<<<<<<<<<<
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- *                         if i2 >= self.right_edge[2]: break
- */
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-          __pyx_t_66 = -1;
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-            __pyx_t_65 += __pyx_bshape_1_left_edges;
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- *                         if i2 >= self.right_edge[2]: break             # <<<<<<<<<<<<<<
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- */
-          __pyx_t_16 = (__pyx_v_i2 >= (((struct __pyx_obj_2yt_13ramses_reader_ProtoSubgrid *)__pyx_v_self)->right_edge[2]));
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- */
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- *                         i = i0 - self.left_edge[0]
- *                         sig0[i] += 1             # <<<<<<<<<<<<<<
- *                         i = i1 - self.left_edge[1]
- *                         sig1[i] += 1
- */
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-          __pyx_t_67 = -1;
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-            __pyx_t_66 += __pyx_bshape_0_sig0;
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-          if (unlikely(__pyx_t_67 != -1)) {
-            __Pyx_RaiseBufferIndexError(__pyx_t_67);
-            {__pyx_filename = __pyx_f[0]; __pyx_lineno = 737; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-          }
-          *__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_sig0.buf, __pyx_t_66, __pyx_bstride_0_sig0) += 1;
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-          /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":738
- *                         i = i0 - self.left_edge[0]
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- *                         i = i1 - self.left_edge[1]             # <<<<<<<<<<<<<<
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- */
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-          /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":739
- *                         sig0[i] += 1
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- *                         sig1[i] += 1             # <<<<<<<<<<<<<<
- *                         i = i2 - self.left_edge[2]
- *                         sig2[i] += 1
- */
-          __pyx_t_67 = __pyx_v_i;
-          __pyx_t_68 = -1;
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-          if (unlikely(__pyx_t_68 != -1)) {
-            __Pyx_RaiseBufferIndexError(__pyx_t_68);
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- *                         i = i2 - self.left_edge[2]             # <<<<<<<<<<<<<<
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- */
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- *                         sig1[i] += 1
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- *                         sig2[i] += 1             # <<<<<<<<<<<<<<
- *                         efficiency += 1
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- */
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-          __pyx_t_69 = -1;
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-          if (unlikely(__pyx_t_69 != -1)) {
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-
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- *                         efficiency += 1
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-      /* "/Users/matthewturk/yt/yt/yt/ramses_reader.pyx":745
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-      __pyx_t_70 = 0;
-      __pyx_t_56 = -1;
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-        __Pyx_RaiseBufferIndexError(__pyx_t_62);
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-  0, /*nb_true_divide*/
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-static PyMappingMethods __pyx_tp_as_mapping_ProtoSubgrid = {
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-static PyBufferProcs __pyx_tp_as_buffer_ProtoSubgrid = {
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-  __pyx_ptype_2yt_13ramses_reader_RAMSES_tree_proxy = &__pyx_type_2yt_13ramses_reader_RAMSES_tree_proxy;
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-  if (__Pyx_SetAttrString(__pyx_m, "ProtoSubgrid", (PyObject *)&__pyx_type_2yt_13ramses_reader_ProtoSubgrid) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 659; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_2yt_13ramses_reader_ProtoSubgrid = &__pyx_type_2yt_13ramses_reader_ProtoSubgrid;
-  /*--- Type import code ---*/
-  __pyx_ptype_5numpy_dtype = __Pyx_ImportType("numpy", "dtype", sizeof(PyArray_Descr), 0); if (unlikely(!__pyx_ptype_5numpy_dtype)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 149; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5numpy_flatiter = __Pyx_ImportType("numpy", "flatiter", sizeof(PyArrayIterObject), 0); if (unlikely(!__pyx_ptype_5numpy_flatiter)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 159; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5numpy_broadcast = __Pyx_ImportType("numpy", "broadcast", sizeof(PyArrayMultiIterObject), 0); if (unlikely(!__pyx_ptype_5numpy_broadcast)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 163; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5numpy_ndarray = __Pyx_ImportType("numpy", "ndarray", sizeof(PyArrayObject), 0); if (unlikely(!__pyx_ptype_5numpy_ndarray)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 172; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  __pyx_ptype_5numpy_ufunc = __Pyx_ImportType("numpy", "ufunc", sizeof(PyUFuncObject), 0); if (unlikely(!__pyx_ptype_5numpy_ufunc)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 849; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
-  /*--- Function import code ---*/
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- * cimport cython
- */
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-  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
-
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-  __Pyx_GOTREF(((PyObject *)__pyx_t_1));
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-  __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
-
-  /* "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/Cython/Includes/numpy.pxd":963
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- *     if arr.base is NULL:
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- */
-  goto __pyx_L0;
-  __pyx_L1_error:;
-  __Pyx_XDECREF(__pyx_t_1);
-  if (__pyx_m) {
-    __Pyx_AddTraceback("init yt.ramses_reader");
-    Py_DECREF(__pyx_m); __pyx_m = 0;
-  } else if (!PyErr_Occurred()) {
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-static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name) {
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-        PyErr_SetObject(PyExc_NameError, name);
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-static void __Pyx_RaiseDoubleKeywordsError(
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-{
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-        "%s() got multiple values for keyword argument '%s'", func_name,
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-static void __Pyx_RaiseArgtupleInvalid(
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-{
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-            "%s() takes %s %zd positional argument%s (%zd given)",
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-static int __Pyx_ParseOptionalKeywords(
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-{
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-
-    while (PyDict_Next(kwds, &pos, &key, &value)) {
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-                        #if PY_MAJOR_VERSION >= 3
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-
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-{
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-static CYTHON_INLINE int __Pyx_IsLittleEndian(void) {
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-typedef struct {
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-  int new_count, enc_count;
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-static void __Pyx_BufFmt_Init(__Pyx_BufFmt_Context* ctx,
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-  ctx->root.name = "buffer dtype";
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-  ctx->enc_count = 0;
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-  while (type->typegroup == 'S') {
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-static int __Pyx_BufFmt_ParseNumber(const char** ts) {
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-            count += *t++ - '0';
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-static void __Pyx_BufFmt_RaiseUnexpectedChar(char ch) {
-  char msg[] = {ch, 0};
-  PyErr_Format(PyExc_ValueError, "Unexpected format string character: '%s'", msg);
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-
-static const char* __Pyx_BufFmt_DescribeTypeChar(char ch, int is_complex) {
-  switch (ch) {
-    case 'b': return "'char'";
-    case 'B': return "'unsigned char'";
-    case 'h': return "'short'";
-    case 'H': return "'unsigned short'";
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-static size_t __Pyx_BufFmt_TypeCharToStandardSize(char ch, int is_complex) {
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-    case 'q': case 'Q': return 8;
-    case 'f': return (is_complex ? 8 : 4);
-    case 'd': return (is_complex ? 16 : 8);
-    case 'g': {
-      PyErr_SetString(PyExc_ValueError, "Python does not define a standard format string size for long double ('g')..");
-      return 0;
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-    case 'O': case 'P': return sizeof(void*);
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-      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
-      return 0;
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-static size_t __Pyx_BufFmt_TypeCharToNativeSize(char ch, int is_complex) {
-  switch (ch) {
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-    #ifdef HAVE_LONG_LONG
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-      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
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-typedef struct { char c; short x; } __Pyx_st_short;
-typedef struct { char c; int x; } __Pyx_st_int;
-typedef struct { char c; long x; } __Pyx_st_long;
-typedef struct { char c; float x; } __Pyx_st_float;
-typedef struct { char c; double x; } __Pyx_st_double;
-typedef struct { char c; long double x; } __Pyx_st_longdouble;
-typedef struct { char c; void *x; } __Pyx_st_void_p;
-#ifdef HAVE_LONG_LONG
-typedef struct { char c; PY_LONG_LONG x; } __Pyx_s_long_long;
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-static size_t __Pyx_BufFmt_TypeCharToAlignment(char ch, int is_complex) {
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-static size_t __Pyx_BufFmt_TypeCharToGroup(char ch, int is_complex) {
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-static void __Pyx_BufFmt_RaiseExpected(__Pyx_BufFmt_Context* ctx) {
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-static int __Pyx_BufFmt_FirstPack(__Pyx_BufFmt_Context* ctx) {
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-}
-
-static const char* __Pyx_BufFmt_CheckString(__Pyx_BufFmt_Context* ctx, const char* ts) {
-  int got_Z = 0;
-  while (1) {
-    switch(*ts) {
-      case 0:
-        if (ctx->enc_type != 0 && ctx->head == NULL) {
-          __Pyx_BufFmt_RaiseExpected(ctx);
-          return NULL;
-        }
-        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
-        if (ctx->head != NULL) {
-          __Pyx_BufFmt_RaiseExpected(ctx);
-          return NULL;
-        }
-        return ts;
-      case ' ':
-      case 10:
-      case 13:
-        ++ts;
-        break;
-      case '<':
-        if (!__Pyx_IsLittleEndian()) {
-          PyErr_SetString(PyExc_ValueError, "Little-endian buffer not supported on big-endian compiler");
-          return NULL;
-        }
-        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
-        ctx->packmode = '=';
-        ++ts;
-        break;
-      case '>':
-      case '!':
-        if (__Pyx_IsLittleEndian()) {
-          PyErr_SetString(PyExc_ValueError, "Big-endian buffer not supported on little-endian compiler");
-          return NULL;
-        }
-        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
-        ctx->packmode = '=';
-        ++ts;
-        break;
-      case '=':
-      case '@':
-      case '^':
-        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
-        ctx->packmode = *ts++;
-        break;
-      case 'T': /* substruct */
-        {
-          int i;
-          const char* ts_after_sub;
-          int struct_count = ctx->new_count;
-          ctx->new_count = 1;
-          ++ts;
-          if (*ts != '{') {
-            PyErr_SetString(PyExc_ValueError, "Buffer acquisition: Expected '{' after 'T'");
-            return NULL;
-          }
-          ++ts;
-          ts_after_sub = ts;
-          for (i = 0; i != struct_count; ++i) {
-            ts_after_sub = __Pyx_BufFmt_CheckString(ctx, ts);
-            if (!ts_after_sub) return NULL;
-          }
-          ts = ts_after_sub;
-        }
-        break;
-      case '}': /* end of substruct; either repeat or move on */
-        ++ts;
-        return ts;
-      case 'x':
-        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
-        ctx->fmt_offset += ctx->new_count;
-        ctx->new_count = 1;
-        ctx->enc_count = 0;
-        ctx->enc_type = 0;
-        ++ts;
-        break;
-      case 'Z':
-        got_Z = 1;
-        ++ts;
-        if (*ts != 'f' && *ts != 'd' && *ts != 'g') {
-          __Pyx_BufFmt_RaiseUnexpectedChar('Z');
-          return NULL;
-        }        /* fall through */
-      case 'c': case 'b': case 'B': case 'h': case 'H': case 'i': case 'I':
-      case 'l': case 'L': case 'q': case 'Q':
-      case 'f': case 'd': case 'g':
-      case 'O':
-        if (ctx->enc_type == *ts && got_Z == ctx->is_complex) {
-          /* Continue pooling same type */
-          ctx->enc_count += ctx->new_count;
-        } else {
-          /* New type */
-          if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
-          ctx->enc_count = ctx->new_count;
-          ctx->enc_type = *ts;
-          ctx->is_complex = got_Z;
-        }
-        ++ts;
-        ctx->new_count = 1;
-        got_Z = 0;
-        break;
-      default:
-        {
-          ctx->new_count = __Pyx_BufFmt_ParseNumber(&ts);
-          if (ctx->new_count == -1) { /* First char was not a digit */
-            char msg[2] = { *ts, 0 };
-            PyErr_Format(PyExc_ValueError,
-                         "Does not understand character buffer dtype format string ('%s')", msg);
-            return NULL;
-          }
-        }
-      
-    }
-  }
-}
-
-static CYTHON_INLINE void __Pyx_ZeroBuffer(Py_buffer* buf) {
-  buf->buf = NULL;
-  buf->obj = NULL;
-  buf->strides = __Pyx_zeros;
-  buf->shape = __Pyx_zeros;
-  buf->suboffsets = __Pyx_minusones;
-}
-
-static CYTHON_INLINE int __Pyx_GetBufferAndValidate(Py_buffer* buf, PyObject* obj, __Pyx_TypeInfo* dtype, int flags, int nd, int cast, __Pyx_BufFmt_StackElem* stack) {
-  if (obj == Py_None) {
-    __Pyx_ZeroBuffer(buf);
-    return 0;
-  }
-  buf->buf = NULL;
-  if (__Pyx_GetBuffer(obj, buf, flags) == -1) goto fail;
-  if (buf->ndim != nd) {
-    PyErr_Format(PyExc_ValueError,
-                 "Buffer has wrong number of dimensions (expected %d, got %d)",
-                 nd, buf->ndim);
-    goto fail;
-  }
-  if (!cast) {
-    __Pyx_BufFmt_Context ctx;
-    __Pyx_BufFmt_Init(&ctx, stack, dtype);
-    if (!__Pyx_BufFmt_CheckString(&ctx, buf->format)) goto fail;
-  }
-  if ((unsigned)buf->itemsize != dtype->size) {
-    PyErr_Format(PyExc_ValueError,
-      "Item size of buffer (%"PY_FORMAT_SIZE_T"d byte%s) does not match size of '%s' (%"PY_FORMAT_SIZE_T"d byte%s)",
-      buf->itemsize, (buf->itemsize > 1) ? "s" : "",
-      dtype->name,
-      dtype->size, (dtype->size > 1) ? "s" : "");
-    goto fail;
-  }
-  if (buf->suboffsets == NULL) buf->suboffsets = __Pyx_minusones;
-  return 0;
-fail:;
-  __Pyx_ZeroBuffer(buf);
-  return -1;
-}
-
-static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info) {
-  if (info->buf == NULL) return;
-  if (info->suboffsets == __Pyx_minusones) info->suboffsets = NULL;
-  __Pyx_ReleaseBuffer(info);
-}
-static void __Pyx_RaiseBufferIndexError(int axis) {
-  PyErr_Format(PyExc_IndexError,
-     "Out of bounds on buffer access (axis %d)", axis);
-}
-
-
-static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb) {
-    PyObject *tmp_type, *tmp_value, *tmp_tb;
-    PyThreadState *tstate = PyThreadState_GET();
-
-    tmp_type = tstate->curexc_type;
-    tmp_value = tstate->curexc_value;
-    tmp_tb = tstate->curexc_traceback;
-    tstate->curexc_type = type;
-    tstate->curexc_value = value;
-    tstate->curexc_traceback = tb;
-    Py_XDECREF(tmp_type);
-    Py_XDECREF(tmp_value);
-    Py_XDECREF(tmp_tb);
-}
-
-static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb) {
-    PyThreadState *tstate = PyThreadState_GET();
-    *type = tstate->curexc_type;
-    *value = tstate->curexc_value;
-    *tb = tstate->curexc_traceback;
-
-    tstate->curexc_type = 0;
-    tstate->curexc_value = 0;
-    tstate->curexc_traceback = 0;
-}
-
-
-static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
-    if (unlikely(!type)) {
-        PyErr_Format(PyExc_SystemError, "Missing type object");
-        return 0;
-    }
-    if (likely(PyObject_TypeCheck(obj, type)))
-        return 1;
-    PyErr_Format(PyExc_TypeError, "Cannot convert %.200s to %.200s",
-                 Py_TYPE(obj)->tp_name, type->tp_name);
-    return 0;
-}
-
-static void __Pyx_RaiseBufferFallbackError(void) {
-  PyErr_Format(PyExc_ValueError,
-     "Buffer acquisition failed on assignment; and then reacquiring the old buffer failed too!");
-}
-
-
-static CYTHON_INLINE int __Pyx_div_int(int a, int b) {
-    int q = a / b;
-    int r = a - q*b;
-    q -= ((r != 0) & ((r ^ b) < 0));
-    return q;
-}
-
-static CYTHON_INLINE __pyx_t_5numpy_int64_t __Pyx_div___pyx_t_5numpy_int64_t(__pyx_t_5numpy_int64_t a, __pyx_t_5numpy_int64_t b) {
-    __pyx_t_5numpy_int64_t q = a / b;
-    __pyx_t_5numpy_int64_t r = a - q*b;
-    q -= ((r != 0) & ((r ^ b) < 0));
-    return q;
-}
-
-static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void) {
-    PyErr_SetString(PyExc_TypeError, "'NoneType' object is not iterable");
-}
-
-static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index) {
-    PyErr_Format(PyExc_ValueError,
-        #if PY_VERSION_HEX < 0x02050000
-                 "need more than %d value%s to unpack", (int)index,
-        #else
-                 "need more than %zd value%s to unpack", index,
-        #endif
-                 (index == 1) ? "" : "s");
-}
-
-static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected) {
-    PyErr_Format(PyExc_ValueError,
-        #if PY_VERSION_HEX < 0x02050000
-            "too many values to unpack (expected %d)", (int)expected);
-        #else
-            "too many values to unpack (expected %zd)", expected);
-        #endif
-}
-
-static void __Pyx_UnpackTupleError(PyObject *t, Py_ssize_t index) {
-    if (t == Py_None) {
-      __Pyx_RaiseNoneNotIterableError();
-    } else if (PyTuple_GET_SIZE(t) < index) {
-      __Pyx_RaiseNeedMoreValuesError(PyTuple_GET_SIZE(t));
-    } else {
-      __Pyx_RaiseTooManyValuesError(index);
-    }
-}
-
-#if PY_MAJOR_VERSION < 3
-static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags) {
-  #if PY_VERSION_HEX >= 0x02060000
-  if (Py_TYPE(obj)->tp_flags & Py_TPFLAGS_HAVE_NEWBUFFER)
-      return PyObject_GetBuffer(obj, view, flags);
-  #endif
-  if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) return __pyx_pf_5numpy_7ndarray___getbuffer__(obj, view, flags);
-  else {
-  PyErr_Format(PyExc_TypeError, "'%100s' does not have the buffer interface", Py_TYPE(obj)->tp_name);
-  return -1;
-    }
-}
-
-static void __Pyx_ReleaseBuffer(Py_buffer *view) {
-  PyObject* obj = view->obj;
-  if (obj) {
-if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) __pyx_pf_5numpy_7ndarray___releasebuffer__(obj, view);
-    Py_DECREF(obj);
-    view->obj = NULL;
-  }
-}
-
-#endif
-
-static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list) {
-    PyObject *py_import = 0;
-    PyObject *empty_list = 0;
-    PyObject *module = 0;
-    PyObject *global_dict = 0;
-    PyObject *empty_dict = 0;
-    PyObject *list;
-    py_import = __Pyx_GetAttrString(__pyx_b, "__import__");
-    if (!py_import)
-        goto bad;
-    if (from_list)
-        list = from_list;
-    else {
-        empty_list = PyList_New(0);
-        if (!empty_list)
-            goto bad;
-        list = empty_list;
-    }
-    global_dict = PyModule_GetDict(__pyx_m);
-    if (!global_dict)
-        goto bad;
-    empty_dict = PyDict_New();
-    if (!empty_dict)
-        goto bad;
-    module = PyObject_CallFunctionObjArgs(py_import,
-        name, global_dict, empty_dict, list, NULL);
-bad:
-    Py_XDECREF(empty_list);
-    Py_XDECREF(py_import);
-    Py_XDECREF(empty_dict);
-    return module;
-}
-
-#if PY_MAJOR_VERSION < 3
-static PyObject *__Pyx_GetStdout(void) {
-    PyObject *f = PySys_GetObject((char *)"stdout");
-    if (!f) {
-        PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");
-    }
-    return f;
-}
-
-static int __Pyx_Print(PyObject* f, PyObject *arg_tuple, int newline) {
-    PyObject* v;
-    int i;
-
-    if (!f) {
-        if (!(f = __Pyx_GetStdout()))
-            return -1;
-    }
-    for (i=0; i < PyTuple_GET_SIZE(arg_tuple); i++) {
-        if (PyFile_SoftSpace(f, 1)) {
-            if (PyFile_WriteString(" ", f) < 0)
-                return -1;
-        }
-        v = PyTuple_GET_ITEM(arg_tuple, i);
-        if (PyFile_WriteObject(v, f, Py_PRINT_RAW) < 0)
-            return -1;
-        if (PyString_Check(v)) {
-            char *s = PyString_AsString(v);
-            Py_ssize_t len = PyString_Size(v);
-            if (len > 0 &&
-                isspace(Py_CHARMASK(s[len-1])) &&
-                s[len-1] != ' ')
-                    PyFile_SoftSpace(f, 0);
-        }
-    }
-    if (newline) {
-        if (PyFile_WriteString("\n", f) < 0)
-            return -1;
-        PyFile_SoftSpace(f, 0);
-    }
-    return 0;
-}
-
-#else /* Python 3 has a print function */
-
-static int __Pyx_Print(PyObject* stream, PyObject *arg_tuple, int newline) {
-    PyObject* kwargs = 0;
-    PyObject* result = 0;
-    PyObject* end_string;
-    if (unlikely(!__pyx_print)) {
-        __pyx_print = __Pyx_GetAttrString(__pyx_b, "print");
-        if (!__pyx_print)
-            return -1;
-    }
-    if (stream) {
-        kwargs = PyDict_New();
-        if (unlikely(!kwargs))
-            return -1;
-        if (unlikely(PyDict_SetItemString(kwargs, "file", stream) < 0))
-            goto bad;
-        if (!newline) {
-            end_string = PyUnicode_FromStringAndSize(" ", 1);
-            if (unlikely(!end_string))
-                goto bad;
-            if (PyDict_SetItemString(kwargs, "end", end_string) < 0) {
-                Py_DECREF(end_string);
-                goto bad;
-            }
-            Py_DECREF(end_string);
-        }
-    } else if (!newline) {
-        if (unlikely(!__pyx_print_kwargs)) {
-            __pyx_print_kwargs = PyDict_New();
-            if (unlikely(!__pyx_print_kwargs))
-                return -1;
-            end_string = PyUnicode_FromStringAndSize(" ", 1);
-            if (unlikely(!end_string))
-                return -1;
-            if (PyDict_SetItemString(__pyx_print_kwargs, "end", end_string) < 0) {
-                Py_DECREF(end_string);
-                return -1;
-            }
-            Py_DECREF(end_string);
-        }
-        kwargs = __pyx_print_kwargs;
-    }
-    result = PyObject_Call(__pyx_print, arg_tuple, kwargs);
-    if (unlikely(kwargs) && (kwargs != __pyx_print_kwargs))
-        Py_DECREF(kwargs);
-    if (!result)
-        return -1;
-    Py_DECREF(result);
-    return 0;
-bad:
-    if (kwargs != __pyx_print_kwargs)
-        Py_XDECREF(kwargs);
-    return -1;
-}
-
-#endif
-
-static CYTHON_INLINE long __Pyx_pow_long(long b, long e) {
-    long t = b;
-    switch (e) {
-        case 3:
-            t *= b;
-        case 2:
-            t *= b;
-        case 1:
-            return t;
-        case 0:
-            return 1;
-    }
-    if (unlikely(e<0)) return 0;
-    t = 1;
-    while (likely(e)) {
-        t *= (b * (e&1)) | ((~e)&1);    /* 1 or b */
-        b *= b;
-        e >>= 1;
-    }
-    return t;
-}
-
-static CYTHON_INLINE npy_int64 __Pyx_PyInt_from_py_npy_int64(PyObject* x) {
-    const npy_int64 neg_one = (npy_int64)-1, const_zero = (npy_int64)0;
-    const int is_unsigned = const_zero < neg_one;
-    if (sizeof(npy_int64) == sizeof(char)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedChar(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedChar(x);
-    } else if (sizeof(npy_int64) == sizeof(short)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedShort(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedShort(x);
-    } else if (sizeof(npy_int64) == sizeof(int)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedInt(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedInt(x);
-    } else if (sizeof(npy_int64) == sizeof(long)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedLong(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedLong(x);
-    } else if (sizeof(npy_int64) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return (npy_int64)__Pyx_PyInt_AsUnsignedLongLong(x);
-        else
-            return (npy_int64)__Pyx_PyInt_AsSignedLongLong(x);
-    }  else {
-        npy_int64 val;
-        PyObject *v = __Pyx_PyNumber_Int(x);
-        #if PY_VERSION_HEX < 0x03000000
-        if (likely(v) && !PyLong_Check(v)) {
-            PyObject *tmp = v;
-            v = PyNumber_Long(tmp);
-            Py_DECREF(tmp);
-        }
-        #endif
-        if (likely(v)) {
-            int one = 1; int is_little = (int)*(unsigned char *)&one;
-            unsigned char *bytes = (unsigned char *)&val;
-            int ret = _PyLong_AsByteArray((PyLongObject *)v,
-                                          bytes, sizeof(val),
-                                          is_little, !is_unsigned);
-            Py_DECREF(v);
-            if (likely(!ret))
-                return val;
-        }
-        return (npy_int64)-1;
-    }
-}
-
-static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int64(npy_int64 val) {
-    const npy_int64 neg_one = (npy_int64)-1, const_zero = (npy_int64)0;
-    const int is_unsigned = const_zero < neg_one;
-    if ((sizeof(npy_int64) == sizeof(char))  ||
-        (sizeof(npy_int64) == sizeof(short))) {
-        return PyInt_FromLong((long)val);
-    } else if ((sizeof(npy_int64) == sizeof(int)) ||
-               (sizeof(npy_int64) == sizeof(long))) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLong((unsigned long)val);
-        else
-            return PyInt_FromLong((long)val);
-    } else if (sizeof(npy_int64) == sizeof(PY_LONG_LONG)) {
-        if (is_unsigned)
-            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
-        else
-            return PyLong_FromLongLong((PY_LONG_LONG)val);
-    } else {
-        int one = 1; int little = (int)*(unsigned char *)&one;
-        unsigned char *bytes = (unsigned char *)&val;
-        return _PyLong_FromByteArray(bytes, sizeof(npy_int64), 
-                                     little, !is_unsigned);
-    }
-}
-
-#if CYTHON_CCOMPLEX
-  #ifdef __cplusplus
-    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
-      return ::std::complex< float >(x, y);
-    }
-  #else
-    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
-      return x + y*(__pyx_t_float_complex)_Complex_I;
-    }
-  #endif
-#else
-    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
-      __pyx_t_float_complex z;
-      z.real = x;
-      z.imag = y;
-      return z;
-    }
-#endif
-
-#if CYTHON_CCOMPLEX
-#else
-    static CYTHON_INLINE int __Pyx_c_eqf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-       return (a.real == b.real) && (a.imag == b.imag);
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_sumf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-        __pyx_t_float_complex z;
-        z.real = a.real + b.real;
-        z.imag = a.imag + b.imag;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_difff(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-        __pyx_t_float_complex z;
-        z.real = a.real - b.real;
-        z.imag = a.imag - b.imag;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_prodf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-        __pyx_t_float_complex z;
-        z.real = a.real * b.real - a.imag * b.imag;
-        z.imag = a.real * b.imag + a.imag * b.real;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_quotf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
-        __pyx_t_float_complex z;
-        float denom = b.real * b.real + b.imag * b.imag;
-        z.real = (a.real * b.real + a.imag * b.imag) / denom;
-        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_negf(__pyx_t_float_complex a) {
-        __pyx_t_float_complex z;
-        z.real = -a.real;
-        z.imag = -a.imag;
-        return z;
-    }
-    static CYTHON_INLINE int __Pyx_c_is_zerof(__pyx_t_float_complex a) {
-       return (a.real == 0) && (a.imag == 0);
-    }
-    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_conjf(__pyx_t_float_complex a) {
-        __pyx_t_float_complex z;
-        z.real =  a.real;
-        z.imag = -a.imag;
-        return z;
-    }
-/*
-    static CYTHON_INLINE float __Pyx_c_absf(__pyx_t_float_complex z) {
-#if HAVE_HYPOT
-        return hypotf(z.real, z.imag);
-#else
-        return sqrtf(z.real*z.real + z.imag*z.imag);
-#endif
-    }
-*/
-#endif
-
-#if CYTHON_CCOMPLEX
-  #ifdef __cplusplus
-    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
-      return ::std::complex< double >(x, y);
-    }
-  #else
-    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
-      return x + y*(__pyx_t_double_complex)_Complex_I;
-    }
-  #endif
-#else
-    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
-      __pyx_t_double_complex z;
-      z.real = x;
-      z.imag = y;
-      return z;
-    }
-#endif
-
-#if CYTHON_CCOMPLEX
-#else
-    static CYTHON_INLINE int __Pyx_c_eq(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-       return (a.real == b.real) && (a.imag == b.imag);
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_sum(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-        __pyx_t_double_complex z;
-        z.real = a.real + b.real;
-        z.imag = a.imag + b.imag;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_diff(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-        __pyx_t_double_complex z;
-        z.real = a.real - b.real;
-        z.imag = a.imag - b.imag;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_prod(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-        __pyx_t_double_complex z;
-        z.real = a.real * b.real - a.imag * b.imag;
-        z.imag = a.real * b.imag + a.imag * b.real;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_quot(__pyx_t_double_complex a, __pyx_t_double_complex b) {
-        __pyx_t_double_complex z;
-        double denom = b.real * b.real + b.imag * b.imag;
-        z.real = (a.real * b.real + a.imag * b.imag) / denom;
-        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
-        return z;
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_neg(__pyx_t_double_complex a) {
-        __pyx_t_double_complex z;
-        z.real = -a.real;
-        z.imag = -a.imag;
-        return z;
-    }
-    static CYTHON_INLINE int __Pyx_c_is_zero(__pyx_t_double_complex a) {
-       return (a.real == 0) && (a.imag == 0);
-    }
-    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_conj(__pyx_t_double_complex a) {
-        __pyx_t_double_complex z;
-        z.real =  a.real;
-        z.imag = -a.imag;
-        return z;
-    }
-/*
-    static CYTHON_INLINE double __Pyx_c_abs(__pyx_t_double_complex z) {
-#if HAVE_HYPOT
-        return hypot(z.real, z.imag);
-#else
-        return sqrt(z.real*z.real + z.imag*z.imag);
-#endif
-    }
-*/
-#endif
-
-#if PY_MAJOR_VERSION < 3
-static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb) {
-    Py_XINCREF(type);
-    Py_XINCREF(value);
-    Py_XINCREF(tb);
-    /* First, check the traceback argument, replacing None with NULL. */
-    if (tb == Py_None) {
-        Py_DECREF(tb);
-        tb = 0;
-    }
-    else if (tb != NULL && !PyTraceBack_Check(tb)) {
-        PyErr_SetString(PyExc_TypeError,
-            "raise: arg 3 must be a traceback or None");
-        goto raise_error;
-    }
-    /* Next, replace a missing value with None */
-    if (value == NULL) {
-        value = Py_None;
-        Py_INCREF(value);
-    }
-    #if PY_VERSION_HEX < 0x02050000
-    if (!PyClass_Check(type))
-    #else
-    if (!PyType_Check(type))
-    #endif
-    {
-        /* Raising an instance.  The value should be a dummy. */
-        if (value != Py_None) {
-            PyErr_SetString(PyExc_TypeError,
-                "instance exception may not have a separate value");
-            goto raise_error;
-        }
-        /* Normalize to raise <class>, <instance> */
-        Py_DECREF(value);
-        value = type;
-        #if PY_VERSION_HEX < 0x02050000
-            if (PyInstance_Check(type)) {
-                type = (PyObject*) ((PyInstanceObject*)type)->in_class;
-                Py_INCREF(type);
-            }
-            else {
-                type = 0;
-                PyErr_SetString(PyExc_TypeError,
-                    "raise: exception must be an old-style class or instance");
-                goto raise_error;
-            }
-        #else
-            type = (PyObject*) Py_TYPE(type);
-            Py_INCREF(type);
-            if (!PyType_IsSubtype((PyTypeObject *)type, (PyTypeObject *)PyExc_BaseException)) {
-                PyErr_SetString(PyExc_TypeError,
-                    "raise: exception class must be a subclass of BaseException");
-                goto raise_error;
-            }
-        #endif
-    }
-
-    __Pyx_ErrRestore(type, value, tb);
-    return;
-raise_error:
-    Py_XDECREF(value);
-    Py_XDECREF(type);
-    Py_XDECREF(tb);
-    return;
-}
-
-#else /* Python 3+ */
-
-static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb) {
-    if (tb == Py_None) {
-        tb = 0;
-    } else if (tb && !PyTraceBack_Check(tb)) {
-        PyErr_SetString(PyExc_TypeError,
-            "raise: arg 3 must be a traceback or None");
-        goto bad;
-    }
-    if (value == Py_None)
-        value = 0;
-
-    if (PyExceptionInstance_Check(type)) {
-        if (value) {
-            PyErr_SetString(PyExc_TypeError,
-                "instance exception may not have a separate value");
-            goto bad;
-        }
-        value = type;
-        type = (PyObject*) Py_TYPE(value);
-    } else if (!PyExceptionClass_Check(type)) {
-        PyErr_SetString(PyExc_TypeError,
-            "raise: exception class must be a subclass of BaseException");
-        goto bad;
-    }
-
-    PyErr_SetObject(type, value);
-
-    if (tb) {
-        PyThreadState *tstate = PyThreadState_GET();
-        PyObject* tmp_tb = tstate->curexc_traceback;
-        if (tb != tmp_tb) {
-            Py_INCREF(tb);
-            tstate->curexc_traceback = tb;
-            Py_XDECREF(tmp_tb);
-        }
-    }
-
-bad:
-    return;
-}
-#endif
-
-static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject* x) {
-    const unsigned char neg_one = (unsigned char)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(unsigned char) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(unsigned char)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to unsigned char" :
-                    "value too large to convert to unsigned char");
-            }
-            return (unsigned char)-1;
-        }
-        return (unsigned char)val;
-    }
-    return (unsigned char)__Pyx_PyInt_AsUnsignedLong(x);
-}
-
-static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject* x) {
-    const unsigned short neg_one = (unsigned short)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(unsigned short) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(unsigned short)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to unsigned short" :
-                    "value too large to convert to unsigned short");
-            }
-            return (unsigned short)-1;
-        }
-        return (unsigned short)val;
-    }
-    return (unsigned short)__Pyx_PyInt_AsUnsignedLong(x);
-}
-
-static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject* x) {
-    const unsigned int neg_one = (unsigned int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(unsigned int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(unsigned int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to unsigned int" :
-                    "value too large to convert to unsigned int");
-            }
-            return (unsigned int)-1;
-        }
-        return (unsigned int)val;
-    }
-    return (unsigned int)__Pyx_PyInt_AsUnsignedLong(x);
-}
-
-static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject* x) {
-    const char neg_one = (char)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(char) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(char)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to char" :
-                    "value too large to convert to char");
-            }
-            return (char)-1;
-        }
-        return (char)val;
-    }
-    return (char)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject* x) {
-    const short neg_one = (short)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(short) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(short)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to short" :
-                    "value too large to convert to short");
-            }
-            return (short)-1;
-        }
-        return (short)val;
-    }
-    return (short)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject* x) {
-    const int neg_one = (int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to int" :
-                    "value too large to convert to int");
-            }
-            return (int)-1;
-        }
-        return (int)val;
-    }
-    return (int)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject* x) {
-    const signed char neg_one = (signed char)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(signed char) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(signed char)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to signed char" :
-                    "value too large to convert to signed char");
-            }
-            return (signed char)-1;
-        }
-        return (signed char)val;
-    }
-    return (signed char)__Pyx_PyInt_AsSignedLong(x);
-}
-
-static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject* x) {
-    const signed short neg_one = (signed short)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(signed short) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(signed short)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to signed short" :
-                    "value too large to convert to signed short");
-            }
-            return (signed short)-1;
-        }
-        return (signed short)val;
-    }
-    return (signed short)__Pyx_PyInt_AsSignedLong(x);
-}
-
-static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject* x) {
-    const signed int neg_one = (signed int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(signed int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(signed int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to signed int" :
-                    "value too large to convert to signed int");
-            }
-            return (signed int)-1;
-        }
-        return (signed int)val;
-    }
-    return (signed int)__Pyx_PyInt_AsSignedLong(x);
-}
-
-static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject* x) {
-    const int neg_one = (int)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-    if (sizeof(int) < sizeof(long)) {
-        long val = __Pyx_PyInt_AsLong(x);
-        if (unlikely(val != (long)(int)val)) {
-            if (!unlikely(val == -1 && PyErr_Occurred())) {
-                PyErr_SetString(PyExc_OverflowError,
-                    (is_unsigned && unlikely(val < 0)) ?
-                    "can't convert negative value to int" :
-                    "value too large to convert to int");
-            }
-            return (int)-1;
-        }
-        return (int)val;
-    }
-    return (int)__Pyx_PyInt_AsLong(x);
-}
-
-static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject* x) {
-    const unsigned long neg_one = (unsigned long)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to unsigned long");
-            return (unsigned long)-1;
-        }
-        return (unsigned long)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to unsigned long");
-                return (unsigned long)-1;
-            }
-            return PyLong_AsUnsignedLong(x);
-        } else {
-            return PyLong_AsLong(x);
-        }
-    } else {
-        unsigned long val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (unsigned long)-1;
-        val = __Pyx_PyInt_AsUnsignedLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject* x) {
-    const unsigned PY_LONG_LONG neg_one = (unsigned PY_LONG_LONG)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to unsigned PY_LONG_LONG");
-            return (unsigned PY_LONG_LONG)-1;
-        }
-        return (unsigned PY_LONG_LONG)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to unsigned PY_LONG_LONG");
-                return (unsigned PY_LONG_LONG)-1;
-            }
-            return PyLong_AsUnsignedLongLong(x);
-        } else {
-            return PyLong_AsLongLong(x);
-        }
-    } else {
-        unsigned PY_LONG_LONG val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (unsigned PY_LONG_LONG)-1;
-        val = __Pyx_PyInt_AsUnsignedLongLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject* x) {
-    const long neg_one = (long)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to long");
-            return (long)-1;
-        }
-        return (long)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to long");
-                return (long)-1;
-            }
-            return PyLong_AsUnsignedLong(x);
-        } else {
-            return PyLong_AsLong(x);
-        }
-    } else {
-        long val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (long)-1;
-        val = __Pyx_PyInt_AsLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject* x) {
-    const PY_LONG_LONG neg_one = (PY_LONG_LONG)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to PY_LONG_LONG");
-            return (PY_LONG_LONG)-1;
-        }
-        return (PY_LONG_LONG)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to PY_LONG_LONG");
-                return (PY_LONG_LONG)-1;
-            }
-            return PyLong_AsUnsignedLongLong(x);
-        } else {
-            return PyLong_AsLongLong(x);
-        }
-    } else {
-        PY_LONG_LONG val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (PY_LONG_LONG)-1;
-        val = __Pyx_PyInt_AsLongLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject* x) {
-    const signed long neg_one = (signed long)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to signed long");
-            return (signed long)-1;
-        }
-        return (signed long)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to signed long");
-                return (signed long)-1;
-            }
-            return PyLong_AsUnsignedLong(x);
-        } else {
-            return PyLong_AsLong(x);
-        }
-    } else {
-        signed long val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (signed long)-1;
-        val = __Pyx_PyInt_AsSignedLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject* x) {
-    const signed PY_LONG_LONG neg_one = (signed PY_LONG_LONG)-1, const_zero = 0;
-    const int is_unsigned = neg_one > const_zero;
-#if PY_VERSION_HEX < 0x03000000
-    if (likely(PyInt_Check(x))) {
-        long val = PyInt_AS_LONG(x);
-        if (is_unsigned && unlikely(val < 0)) {
-            PyErr_SetString(PyExc_OverflowError,
-                            "can't convert negative value to signed PY_LONG_LONG");
-            return (signed PY_LONG_LONG)-1;
-        }
-        return (signed PY_LONG_LONG)val;
-    } else
-#endif
-    if (likely(PyLong_Check(x))) {
-        if (is_unsigned) {
-            if (unlikely(Py_SIZE(x) < 0)) {
-                PyErr_SetString(PyExc_OverflowError,
-                                "can't convert negative value to signed PY_LONG_LONG");
-                return (signed PY_LONG_LONG)-1;
-            }
-            return PyLong_AsUnsignedLongLong(x);
-        } else {
-            return PyLong_AsLongLong(x);
-        }
-    } else {
-        signed PY_LONG_LONG val;
-        PyObject *tmp = __Pyx_PyNumber_Int(x);
-        if (!tmp) return (signed PY_LONG_LONG)-1;
-        val = __Pyx_PyInt_AsSignedLongLong(tmp);
-        Py_DECREF(tmp);
-        return val;
-    }
-}
-
-#ifndef __PYX_HAVE_RT_ImportType
-#define __PYX_HAVE_RT_ImportType
-static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name,
-    long size, int strict)
-{
-    PyObject *py_module = 0;
-    PyObject *result = 0;
-    PyObject *py_name = 0;
-    char warning[200];
-
-    py_module = __Pyx_ImportModule(module_name);
-    if (!py_module)
-        goto bad;
-    #if PY_MAJOR_VERSION < 3
-    py_name = PyString_FromString(class_name);
-    #else
-    py_name = PyUnicode_FromString(class_name);
-    #endif
-    if (!py_name)
-        goto bad;
-    result = PyObject_GetAttr(py_module, py_name);
-    Py_DECREF(py_name);
-    py_name = 0;
-    Py_DECREF(py_module);
-    py_module = 0;
-    if (!result)
-        goto bad;
-    if (!PyType_Check(result)) {
-        PyErr_Format(PyExc_TypeError, 
-            "%s.%s is not a type object",
-            module_name, class_name);
-        goto bad;
-    }
-    if (!strict && ((PyTypeObject *)result)->tp_basicsize > size) {
-        PyOS_snprintf(warning, sizeof(warning), 
-            "%s.%s size changed, may indicate binary incompatibility",
-            module_name, class_name);
-        #if PY_VERSION_HEX < 0x02050000
-        PyErr_Warn(NULL, warning);
-        #else
-        PyErr_WarnEx(NULL, warning, 0);
-        #endif
-    }
-    else if (((PyTypeObject *)result)->tp_basicsize != size) {
-        PyErr_Format(PyExc_ValueError, 
-            "%s.%s has the wrong size, try recompiling",
-            module_name, class_name);
-        goto bad;
-    }
-    return (PyTypeObject *)result;
-bad:
-    Py_XDECREF(py_module);
-    Py_XDECREF(result);
-    return 0;
-}
-#endif
-
-#ifndef __PYX_HAVE_RT_ImportModule
-#define __PYX_HAVE_RT_ImportModule
-static PyObject *__Pyx_ImportModule(const char *name) {
-    PyObject *py_name = 0;
-    PyObject *py_module = 0;
-
-    #if PY_MAJOR_VERSION < 3
-    py_name = PyString_FromString(name);
-    #else
-    py_name = PyUnicode_FromString(name);
-    #endif
-    if (!py_name)
-        goto bad;
-    py_module = PyImport_Import(py_name);
-    Py_DECREF(py_name);
-    return py_module;
-bad:
-    Py_XDECREF(py_name);
-    return 0;
-}
-#endif
-
-#include "compile.h"
-#include "frameobject.h"
-#include "traceback.h"
-
-static void __Pyx_AddTraceback(const char *funcname) {
-    PyObject *py_srcfile = 0;
-    PyObject *py_funcname = 0;
-    PyObject *py_globals = 0;
-    PyCodeObject *py_code = 0;
-    PyFrameObject *py_frame = 0;
-
-    #if PY_MAJOR_VERSION < 3
-    py_srcfile = PyString_FromString(__pyx_filename);
-    #else
-    py_srcfile = PyUnicode_FromString(__pyx_filename);
-    #endif
-    if (!py_srcfile) goto bad;
-    if (__pyx_clineno) {
-        #if PY_MAJOR_VERSION < 3
-        py_funcname = PyString_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, __pyx_clineno);
-        #else
-        py_funcname = PyUnicode_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, __pyx_clineno);
-        #endif
-    }
-    else {
-        #if PY_MAJOR_VERSION < 3
-        py_funcname = PyString_FromString(funcname);
-        #else
-        py_funcname = PyUnicode_FromString(funcname);
-        #endif
-    }
-    if (!py_funcname) goto bad;
-    py_globals = PyModule_GetDict(__pyx_m);
-    if (!py_globals) goto bad;
-    py_code = PyCode_New(
-        0,            /*int argcount,*/
-        #if PY_MAJOR_VERSION >= 3
-        0,            /*int kwonlyargcount,*/
-        #endif
-        0,            /*int nlocals,*/
-        0,            /*int stacksize,*/
-        0,            /*int flags,*/
-        __pyx_empty_bytes, /*PyObject *code,*/
-        __pyx_empty_tuple,  /*PyObject *consts,*/
-        __pyx_empty_tuple,  /*PyObject *names,*/
-        __pyx_empty_tuple,  /*PyObject *varnames,*/
-        __pyx_empty_tuple,  /*PyObject *freevars,*/
-        __pyx_empty_tuple,  /*PyObject *cellvars,*/
-        py_srcfile,   /*PyObject *filename,*/
-        py_funcname,  /*PyObject *name,*/
-        __pyx_lineno,   /*int firstlineno,*/
-        __pyx_empty_bytes  /*PyObject *lnotab*/
-    );
-    if (!py_code) goto bad;
-    py_frame = PyFrame_New(
-        PyThreadState_GET(), /*PyThreadState *tstate,*/
-        py_code,             /*PyCodeObject *code,*/
-        py_globals,          /*PyObject *globals,*/
-        0                    /*PyObject *locals*/
-    );
-    if (!py_frame) goto bad;
-    py_frame->f_lineno = __pyx_lineno;
-    PyTraceBack_Here(py_frame);
-bad:
-    Py_XDECREF(py_srcfile);
-    Py_XDECREF(py_funcname);
-    Py_XDECREF(py_code);
-    Py_XDECREF(py_frame);
-}
-
-static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
-    while (t->p) {
-        #if PY_MAJOR_VERSION < 3
-        if (t->is_unicode) {
-            *t->p = PyUnicode_DecodeUTF8(t->s, t->n - 1, NULL);
-        } else if (t->intern) {
-            *t->p = PyString_InternFromString(t->s);
-        } else {
-            *t->p = PyString_FromStringAndSize(t->s, t->n - 1);
-        }
-        #else  /* Python 3+ has unicode identifiers */
-        if (t->is_unicode | t->is_str) {
-            if (t->intern) {
-                *t->p = PyUnicode_InternFromString(t->s);
-            } else if (t->encoding) {
-                *t->p = PyUnicode_Decode(t->s, t->n - 1, t->encoding, NULL);
-            } else {
-                *t->p = PyUnicode_FromStringAndSize(t->s, t->n - 1);
-            }
-        } else {
-            *t->p = PyBytes_FromStringAndSize(t->s, t->n - 1);
-        }
-        #endif
-        if (!*t->p)
-            return -1;
-        ++t;
-    }
-    return 0;
-}
-
-/* Type Conversion Functions */
-
-static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject* x) {
-   int is_true = x == Py_True;
-   if (is_true | (x == Py_False) | (x == Py_None)) return is_true;
-   else return PyObject_IsTrue(x);
-}
-
-static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x) {
-  PyNumberMethods *m;
-  const char *name = NULL;
-  PyObject *res = NULL;
-#if PY_VERSION_HEX < 0x03000000
-  if (PyInt_Check(x) || PyLong_Check(x))
-#else
-  if (PyLong_Check(x))
-#endif
-    return Py_INCREF(x), x;
-  m = Py_TYPE(x)->tp_as_number;
-#if PY_VERSION_HEX < 0x03000000
-  if (m && m->nb_int) {
-    name = "int";
-    res = PyNumber_Int(x);
-  }
-  else if (m && m->nb_long) {
-    name = "long";
-    res = PyNumber_Long(x);
-  }
-#else
-  if (m && m->nb_int) {
-    name = "int";
-    res = PyNumber_Long(x);
-  }
-#endif
-  if (res) {
-#if PY_VERSION_HEX < 0x03000000
-    if (!PyInt_Check(res) && !PyLong_Check(res)) {
-#else
-    if (!PyLong_Check(res)) {
-#endif
-      PyErr_Format(PyExc_TypeError,
-                   "__%s__ returned non-%s (type %.200s)",
-                   name, name, Py_TYPE(res)->tp_name);
-      Py_DECREF(res);
-      return NULL;
-    }
-  }
-  else if (!PyErr_Occurred()) {
-    PyErr_SetString(PyExc_TypeError,
-                    "an integer is required");
-  }
-  return res;
-}
-
-static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject* b) {
-  Py_ssize_t ival;
-  PyObject* x = PyNumber_Index(b);
-  if (!x) return -1;
-  ival = PyInt_AsSsize_t(x);
-  Py_DECREF(x);
-  return ival;
-}
-
-static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t ival) {
-#if PY_VERSION_HEX < 0x02050000
-   if (ival <= LONG_MAX)
-       return PyInt_FromLong((long)ival);
-   else {
-       unsigned char *bytes = (unsigned char *) &ival;
-       int one = 1; int little = (int)*(unsigned char*)&one;
-       return _PyLong_FromByteArray(bytes, sizeof(size_t), little, 0);
-   }
-#else
-   return PyInt_FromSize_t(ival);
-#endif
-}
-
-static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject* x) {
-   unsigned PY_LONG_LONG val = __Pyx_PyInt_AsUnsignedLongLong(x);
-   if (unlikely(val == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())) {
-       return (size_t)-1;
-   } else if (unlikely(val != (unsigned PY_LONG_LONG)(size_t)val)) {
-       PyErr_SetString(PyExc_OverflowError,
-                       "value too large to convert to size_t");
-       return (size_t)-1;
-   }
-   return (size_t)val;
-}
-
-
-#endif /* Py_PYTHON_H */
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/setup.py
--- a/yt/setup.py	Wed Aug 25 18:03:39 2010 -0600
+++ b/yt/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -56,13 +56,11 @@
 def configuration(parent_package='', top_path=None):
     from numpy.distutils.misc_util import Configuration
     config = Configuration('yt', parent_package, top_path)
-    config.add_subpackage('lagos')
-    config.add_subpackage('raven')
-    config.add_subpackage('fido')
-    config.add_subpackage('reason')
-    config.add_subpackage('extensions')
-    config.add_subpackage('parallel_tools')
+    config.add_subpackage('analysis_modules')
     config.add_subpackage('data_objects')
+    config.add_subpackage('frontends')
+    config.add_subpackage('utilities')
+    config.add_subpackage('visualization')
     png_inc, png_lib = check_for_png()
     include_dirs=[png_inc]
     library_dirs=[png_lib]
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/CICDeposit.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/CICDeposit.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,80 @@
+"""
+Simle integrators for the radiative transfer equation
+
+Author: Britton Smith <brittonsmith@gmail.com>
+Affiliation: CASA/University of Colorado
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+@cython.boundscheck(False)
+@cython.wraparound(False)
+def CICDeposit_3(np.ndarray[np.float64_t, ndim=1] posx,
+                 np.ndarray[np.float64_t, ndim=1] posy,
+                 np.ndarray[np.float64_t, ndim=1] posz,
+                 np.ndarray[np.float32_t, ndim=1] mass,
+                 np.int64_t npositions,
+                 np.ndarray[np.float32_t, ndim=3] field,
+                 np.ndarray[np.float64_t, ndim=1] leftEdge,
+                 np.ndarray[np.int32_t, ndim=1] gridDimension,
+                 np.float64_t cellSize):
+
+    cdef int i1, j1, k1, n
+    cdef double xpos, ypos, zpos
+    cdef double fact, edge0, edge1, edge2
+    cdef double le0, le1, le2
+    cdef float dx, dy, dz, dx2, dy2, dz2
+
+    edge0 = (<float> gridDimension[0]) - 0.5001
+    edge1 = (<float> gridDimension[1]) - 0.5001
+    edge2 = (<float> gridDimension[2]) - 0.5001
+    fact = 1.0 / cellSize
+
+    le0 = leftEdge[0]
+    le1 = leftEdge[1]
+    le2 = leftEdge[2]
+
+    for n in range(npositions):
+
+        # Compute the position of the central cell
+        xpos = fmin(fmax((posx[n] - le0)*fact, 0.5001), edge0)
+        ypos = fmin(fmax((posy[n] - le1)*fact, 0.5001), edge1)
+        zpos = fmin(fmax((posz[n] - le2)*fact, 0.5001), edge2)
+
+        i1  = <int> (xpos + 0.5)
+        j1  = <int> (ypos + 0.5)
+        k1  = <int> (zpos + 0.5)
+
+        # Compute the weights
+        dx = (<float> i1) + 0.5 - xpos
+        dy = (<float> j1) + 0.5 - ypos
+        dz = (<float> k1) + 0.5 - zpos
+        dx2 =  1.0 - dx
+        dy2 =  1.0 - dy
+        dz2 =  1.0 - dz
+
+        # Interpolate from field into sumfield
+        field[i1-1,j1-1,k1-1] += mass[n] * dx  * dy  * dz
+        field[i1  ,j1-1,k1-1] += mass[n] * dx2 * dy  * dz
+        field[i1-1,j1  ,k1-1] += mass[n] * dx  * dy2 * dz
+        field[i1  ,j1  ,k1-1] += mass[n] * dx2 * dy2 * dz
+        field[i1-1,j1-1,k1  ] += mass[n] * dx  * dy  * dz2
+        field[i1  ,j1-1,k1  ] += mass[n] * dx2 * dy  * dz2
+        field[i1-1,j1  ,k1  ] += mass[n] * dx  * dy2 * dz2
+        field[i1  ,j1  ,k1  ] += mass[n] * dx2 * dy2 * dz2
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/ContourFinding.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/ContourFinding.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,176 @@
+"""
+A two-pass contour finding algorithm
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import numpy as np
+cimport numpy as np
+cimport cython
+
+cdef extern from "math.h":
+    double fabs(double x)
+
+cdef inline np.int64_t i64max(np.int64_t i0, np.int64_t i1):
+    if i0 > i1: return i0
+    return i1
+
+cdef inline np.int64_t i64min(np.int64_t i0, np.int64_t i1):
+    if i0 < i1: return i0
+    return i1
+
+@cython.boundscheck(False)
+def construct_boundary_relationships(
+        np.ndarray[dtype=np.int64_t, ndim=3] contour_ids):
+    # We only look at the boundary and one cell in
+    cdef int i, j, nx, ny, nz, offset_i, offset_j, oi, oj
+    cdef np.int64_t c1, c2
+    tree = []
+    nx = contour_ids.shape[0]
+    ny = contour_ids.shape[1]
+    nz = contour_ids.shape[2]
+    # First x-pass
+    for i in range(ny):
+        for j in range(nz):
+            for offset_i in range(3):
+                oi = offset_i - 1
+                if i == 0 and oi == -1: continue
+                if i == ny - 1 and oj == 1: continue
+                for offset_j in range(3):
+                    oj = offset_j - 1
+                    if j == 0 and oj == -1: continue
+                    if j == nz - 1 and oj == 1: continue
+                    c1 = contour_ids[0, i, j]
+                    c2 = contour_ids[1, i + oi, j + oj]
+                    if c1 > -1 and c2 > -1:
+                        tree.append((i64max(c1,c2), i64min(c1,c2)))
+                    c1 = contour_ids[nx-1, i, j]
+                    c2 = contour_ids[nx-2, i + oi, j + oj]
+                    if c1 > -1 and c2 > -1:
+                        tree.append((i64max(c1,c2), i64min(c1,c2)))
+    # Now y-pass
+    for i in range(nx):
+        for j in range(nz):
+            for offset_i in range(3):
+                oi = offset_i - 1
+                if i == 0 and oi == -1: continue
+                if i == nx - 1 and oj == 1: continue
+                for offset_j in range(3):
+                    oj = offset_j - 1
+                    if j == 0 and oj == -1: continue
+                    if j == nz - 1 and oj == 1: continue
+                    c1 = contour_ids[i, 0, j]
+                    c2 = contour_ids[i + oi, 1, j + oj]
+                    if c1 > -1 and c2 > -1:
+                        tree.append((i64max(c1,c2), i64min(c1,c2)))
+                    c1 = contour_ids[i, ny-1, j]
+                    c2 = contour_ids[i + oi, ny-2, j + oj]
+                    if c1 > -1 and c2 > -1:
+                        tree.append((i64max(c1,c2), i64min(c1,c2)))
+    for i in range(nx):
+        for j in range(ny):
+            for offset_i in range(3):
+                oi = offset_i - 1
+                if i == 0 and oi == -1: continue
+                if i == nx - 1 and oj == 1: continue
+                for offset_j in range(3):
+                    oj = offset_j - 1
+                    if j == 0 and oj == -1: continue
+                    if j == ny - 1 and oj == 1: continue
+                    c1 = contour_ids[i, j, 0]
+                    c2 = contour_ids[i + oi, j + oj, 1]
+                    if c1 > -1 and c2 > -1:
+                        tree.append((i64max(c1,c2), i64min(c1,c2)))
+                    c1 = contour_ids[i, j, nz-1]
+                    c2 = contour_ids[i + oi, j + oj, nz-2]
+                    if c1 > -1 and c2 > -1:
+                        tree.append((i64max(c1,c2), i64min(c1,c2)))
+    return tree
+
+cdef inline int are_neighbors(
+            np.float64_t x1, np.float64_t y1, np.float64_t z1,
+            np.float64_t dx1, np.float64_t dy1, np.float64_t dz1,
+            np.float64_t x2, np.float64_t y2, np.float64_t z2,
+            np.float64_t dx2, np.float64_t dy2, np.float64_t dz2,
+        ):
+    # We assume an epsilon of 1e-15
+    if fabs(x1-x2) > 0.5*(dx1+dx2): return 0
+    if fabs(y1-y2) > 0.5*(dy1+dy2): return 0
+    if fabs(z1-z2) > 0.5*(dz1+dz2): return 0
+    return 1
+
+@cython.boundscheck(False)
+@cython.wraparound(False)
+def identify_field_neighbors(
+            np.ndarray[dtype=np.float64_t, ndim=1] field,
+            np.ndarray[dtype=np.float64_t, ndim=1] x,
+            np.ndarray[dtype=np.float64_t, ndim=1] y,
+            np.ndarray[dtype=np.float64_t, ndim=1] z,
+            np.ndarray[dtype=np.float64_t, ndim=1] dx,
+            np.ndarray[dtype=np.float64_t, ndim=1] dy,
+            np.ndarray[dtype=np.float64_t, ndim=1] dz,
+        ):
+    # We assume this field is pre-jittered; it has no identical values.
+    cdef int outer, inner, N, added
+    cdef np.float64_t x1, y1, z1, dx1, dy1, dz1
+    N = field.shape[0]
+    #cdef np.ndarray[dtype=np.object_t] joins
+    joins = [[] for outer in range(N)]
+    #joins = np.empty(N, dtype='object')
+    for outer in range(N):
+        if (outer % 10000) == 0: print outer, N
+        x1 = x[outer]
+        y1 = y[outer]
+        z1 = z[outer]
+        dx1 = dx[outer]
+        dy1 = dy[outer]
+        dz1 = dz[outer]
+        this_joins = joins[outer]
+        added = 0
+        # Go in reverse order
+        for inner in range(outer, 0, -1):
+            if not are_neighbors(x1, y1, z1, dx1, dy1, dz1,
+                                 x[inner], y[inner], z[inner],
+                                 dx[inner], dy[inner], dz[inner]):
+                continue
+            # Hot dog, we have a weiner!
+            this_joins.append(inner)
+            added += 1
+            if added == 26: break
+    return joins
+
+@cython.boundscheck(False)
+@cython.wraparound(False)
+def extract_identified_contours(int max_ind, joins):
+    cdef int i
+    contours = []
+    for i in range(max_ind + 1): # +1 to get to the max_ind itself
+        contours.append(set([i]))
+        if len(joins[i]) == 0:
+            continue
+        proto_contour = [i]
+        for j in joins[i]:
+            proto_contour += contours[j]
+        proto_contour = set(proto_contour)
+        for j in proto_contour:
+            contours[j] = proto_contour
+    return contours
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/DepthFirstOctree.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/DepthFirstOctree.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,167 @@
+"""
+This is a recursive function to return a depth-first octree
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import numpy as np
+cimport numpy as np
+cimport cython
+
+cdef class position:
+    cdef public int output_pos, refined_pos
+    def __cinit__(self):
+        self.output_pos = 0
+        self.refined_pos = 0
+
+cdef class OctreeGrid:
+    cdef public object child_indices, fields, left_edges, dimensions, dx
+    cdef public int level
+    def __cinit__(self,
+                  np.ndarray[np.int32_t, ndim=3] child_indices,
+                  np.ndarray[np.float64_t, ndim=4] fields,
+                  np.ndarray[np.float64_t, ndim=1] left_edges,
+                  np.ndarray[np.int32_t, ndim=1] dimensions,
+                  np.ndarray[np.float64_t, ndim=1] dx,
+                  int level):
+        self.child_indices = child_indices
+        self.fields = fields
+        self.left_edges = left_edges
+        self.dimensions = dimensions
+        self.dx = dx
+        self.level = level
+
+cdef class OctreeGridList:
+    cdef public object grids
+    def __cinit__(self, grids):
+        self.grids = grids
+
+    def __getitem__(self, int item):
+        return self.grids[item]
+
+@cython.boundscheck(False)
+def RecurseOctreeDepthFirst(int i_i, int j_i, int k_i,
+                            int i_f, int j_f, int k_f,
+                            position curpos, int gi, 
+                            np.ndarray[np.float64_t, ndim=2] output,
+                            np.ndarray[np.int32_t, ndim=1] refined,
+                            OctreeGridList grids):
+    cdef int i, i_off, j, j_off, k, k_off, ci, fi
+    cdef int child_i, child_j, child_k
+    cdef OctreeGrid child_grid
+    cdef OctreeGrid grid = grids[gi-1]
+    cdef np.ndarray[np.int32_t, ndim=3] child_indices = grid.child_indices
+    cdef np.ndarray[np.int32_t, ndim=1] dimensions = grid.dimensions
+    cdef np.ndarray[np.float64_t, ndim=4] fields = grid.fields
+    cdef np.ndarray[np.float64_t, ndim=1] leftedges = grid.left_edges
+    cdef np.float64_t dx = grid.dx[0]
+    cdef np.float64_t child_dx
+    cdef np.ndarray[np.float64_t, ndim=1] child_leftedges
+    cdef np.float64_t cx, cy, cz
+    for i_off in range(i_f):
+        i = i_off + i_i
+        cx = (leftedges[0] + i*dx)
+        for j_off in range(j_f):
+            j = j_off + j_i
+            cy = (leftedges[1] + j*dx)
+            for k_off in range(k_f):
+                k = k_off + k_i
+                cz = (leftedges[2] + k*dx)
+                ci = grid.child_indices[i,j,k]
+                if ci == -1:
+                    for fi in range(fields.shape[0]):
+                        output[curpos.output_pos,fi] = fields[fi,i,j,k]
+                    refined[curpos.refined_pos] = 0
+                    curpos.output_pos += 1
+                    curpos.refined_pos += 1
+                else:
+                    refined[curpos.refined_pos] = 1
+                    curpos.refined_pos += 1
+                    child_grid = grids[ci-1]
+                    child_dx = child_grid.dx[0]
+                    child_leftedges = child_grid.left_edges
+                    child_i = int((cx - child_leftedges[0])/child_dx)
+                    child_j = int((cy - child_leftedges[1])/child_dx)
+                    child_k = int((cz - child_leftedges[2])/child_dx)
+                    s = RecurseOctreeDepthFirst(child_i, child_j, child_k, 2, 2, 2,
+                                        curpos, ci, output, refined, grids)
+    return s
+
+@cython.boundscheck(False)
+def RecurseOctreeByLevels(int i_i, int j_i, int k_i,
+                          int i_f, int j_f, int k_f,
+                          np.ndarray[np.int32_t, ndim=1] curpos,
+                          int gi, 
+                          np.ndarray[np.float64_t, ndim=2] output,
+                          np.ndarray[np.int32_t, ndim=2] genealogy,
+                          np.ndarray[np.float64_t, ndim=2] corners,
+                          OctreeGridList grids):
+    cdef np.int32_t i, i_off, j, j_off, k, k_off, ci, fi
+    cdef int child_i, child_j, child_k
+    cdef OctreeGrid child_grid
+    cdef OctreeGrid grid = grids[gi-1]
+    cdef int level = grid.level
+    cdef np.ndarray[np.int32_t, ndim=3] child_indices = grid.child_indices
+    cdef np.ndarray[np.int32_t, ndim=1] dimensions = grid.dimensions
+    cdef np.ndarray[np.float64_t, ndim=4] fields = grid.fields
+    cdef np.ndarray[np.float64_t, ndim=1] leftedges = grid.left_edges
+    cdef np.float64_t dx = grid.dx[0]
+    cdef np.float64_t child_dx
+    cdef np.ndarray[np.float64_t, ndim=1] child_leftedges
+    cdef np.float64_t cx, cy, cz
+    cdef int cp
+    for i_off in range(i_f):
+        i = i_off + i_i
+        cx = (leftedges[0] + i*dx)
+        if i_f > 2: print k, cz
+        for j_off in range(j_f):
+            j = j_off + j_i
+            cy = (leftedges[1] + j*dx)
+            for k_off in range(k_f):
+                k = k_off + k_i
+                cz = (leftedges[2] + k*dx)
+                cp = curpos[level]
+                corners[cp, 0] = cx 
+                corners[cp, 1] = cy 
+                corners[cp, 2] = cz
+                genealogy[curpos[level], 2] = level
+                # always output data
+                for fi in range(fields.shape[0]):
+                    output[cp,fi] = fields[fi,i,j,k]
+                ci = child_indices[i,j,k]
+                if ci > -1:
+                    child_grid = grids[ci-1]
+                    child_dx = child_grid.dx[0]
+                    child_leftedges = child_grid.left_edges
+                    child_i = int((cx-child_leftedges[0])/child_dx)
+                    child_j = int((cy-child_leftedges[1])/child_dx)
+                    child_k = int((cz-child_leftedges[2])/child_dx)
+                    # set current child id to id of next cell to examine
+                    genealogy[cp, 0] = curpos[level+1] 
+                    # set next parent id to id of current cell
+                    genealogy[curpos[level+1]:curpos[level+1]+8, 1] = cp
+                    s = RecurseOctreeByLevels(child_i, child_j, child_k, 2, 2, 2,
+                                              curpos, ci, output, genealogy,
+                                              corners, grids)
+                curpos[level] += 1
+    return s
+
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/FixedInterpolator.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/FixedInterpolator.c	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,130 @@
+/************************************************************************
+* Copyright (C) 2009 Matthew Turk.  All Rights Reserved.
+*
+* This file is part of yt.
+*
+* yt is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+************************************************************************/
+
+
+//
+// A small, tiny, itty bitty module for computation-intensive interpolation
+// that I can't seem to make fast in Cython
+//
+
+#include "FixedInterpolator.h"
+
+#define VINDEX(A,B,C) data[((((A)+ci[0])*(ds[1]+1)+((B)+ci[1]))*(ds[2]+1)+ci[2]+(C))]
+//  (((C*ds[1])+B)*ds[0]+A)
+#define OINDEX(A,B,C) data[(A)*(ds[1]+1)*(ds[2]+1)+(B)*ds[2]+(B)+(C)]
+
+npy_float64 fast_interpolate(int ds[3], int ci[3], npy_float64 dp[3],
+                             npy_float64 *data)
+{
+    int i;
+    npy_float64 dv, dm[3];
+    for(i=0;i<3;i++)dm[i] = (1.0 - dp[i]);
+    dv  = 0.0;
+    dv += VINDEX(0,0,0) * (dm[0]*dm[1]*dm[2]);
+    dv += VINDEX(0,0,1) * (dm[0]*dm[1]*dp[2]);
+    dv += VINDEX(0,1,0) * (dm[0]*dp[1]*dm[2]);
+    dv += VINDEX(0,1,1) * (dm[0]*dp[1]*dp[2]);
+    dv += VINDEX(1,0,0) * (dp[0]*dm[1]*dm[2]);
+    dv += VINDEX(1,0,1) * (dp[0]*dm[1]*dp[2]);
+    dv += VINDEX(1,1,0) * (dp[0]*dp[1]*dm[2]);
+    dv += VINDEX(1,1,1) * (dp[0]*dp[1]*dp[2]);
+    /*assert(dv < -20);*/
+    return dv;
+}
+
+npy_float64 offset_interpolate(int ds[3], npy_float64 dp[3], npy_float64 *data)
+{
+    int i;
+    npy_float64 dv, vz[4];
+
+    dv = 1.0 - dp[2];
+    vz[0] = dv*OINDEX(0,0,0) + dp[2]*OINDEX(0,0,1);
+    vz[1] = dv*OINDEX(0,1,0) + dp[2]*OINDEX(0,1,1);
+    vz[2] = dv*OINDEX(1,0,0) + dp[2]*OINDEX(1,0,1);
+    vz[3] = dv*OINDEX(1,1,0) + dp[2]*OINDEX(1,1,1);
+
+    dv = 1.0 - dp[1];
+    vz[0] = dv*vz[0] + dp[1]*vz[1];
+    vz[1] = dv*vz[2] + dp[1]*vz[3];
+
+    dv = 1.0 - dp[0];
+    vz[0] = dv*vz[0] + dp[0]*vz[1];
+
+    return vz[0];
+}
+
+npy_float64 trilinear_interpolate(int ds[3], int ci[3], npy_float64 dp[3],
+				  npy_float64 *data)
+{
+    /* dims is one less than the dimensions of the array */
+    int i;
+    npy_float64 dm[3], vz[4];
+  //dp is the distance to the plane.  dm is val, dp = 1-val
+    for(i=0;i<3;i++)dm[i] = (1.0 - dp[i]);
+    
+  //First interpolate in z
+    vz[0] = dm[2]*VINDEX(0,0,0) + dp[2]*VINDEX(0,0,1);
+    vz[1] = dm[2]*VINDEX(0,1,0) + dp[2]*VINDEX(0,1,1);
+    vz[2] = dm[2]*VINDEX(1,0,0) + dp[2]*VINDEX(1,0,1);
+    vz[3] = dm[2]*VINDEX(1,1,0) + dp[2]*VINDEX(1,1,1);
+
+  //Then in y
+    vz[0] = dm[1]*vz[0] + dp[1]*vz[1];
+    vz[1] = dm[1]*vz[2] + dp[1]*vz[3];
+
+  //Then in x
+    vz[0] = dm[0]*vz[0] + dp[0]*vz[1];
+    /*assert(dv < -20);*/
+    return vz[0];
+}
+
+npy_float64 eval_gradient(int *ds, int *ci, npy_float64 *dp,
+				  npy_float64 *data, npy_float64 *grad)
+{
+    // We just take some small value
+
+    int i;
+    npy_float64 denom, plus, minus, backup, normval;
+    
+    normval = 0.0;
+    for (i = 0; i < 3; i++) {
+      backup = dp[i];
+      grad[i] = 0.0;
+      if (dp[i] >= 0.95) {plus = dp[i]; minus = dp[i] - 0.05;}
+      else if (dp[i] <= 0.05) {plus = dp[i] + 0.05; minus = 0.0;}
+      else {plus = dp[i] + 0.05; minus = dp[i] - 0.05;}
+      //fprintf(stderr, "DIM: %d %0.3lf %0.3lf\n", i, plus, minus);
+      denom = plus - minus;
+      dp[i] = plus;
+      grad[i] += trilinear_interpolate(ds, ci, dp, data) / denom;
+      dp[i] = minus;
+      grad[i] -= trilinear_interpolate(ds, ci, dp, data) / denom;
+      dp[i] = backup;
+      normval += grad[i]*grad[i];
+    }
+    if (normval != 0.0){
+      normval = sqrt(normval);
+      for (i = 0; i < 3; i++) grad[i] /= -normval;
+      //fprintf(stderr, "Normval: %0.3lf %0.3lf %0.3lf %0.3lf\n",
+      //        normval, grad[0], grad[1], grad[2]);
+    }else{
+      grad[0]=grad[1]=grad[2]=0.0;
+    }
+}
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/FixedInterpolator.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/FixedInterpolator.h	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,45 @@
+/************************************************************************
+* Copyright (C) 2009 Matthew Turk.  All Rights Reserved.
+*
+* This file is part of yt.
+*
+* yt is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+************************************************************************/
+
+
+//
+// A small, tiny, itty bitty module for computation-intensive interpolation
+// that I can't seem to make fast in Cython
+//
+
+#include "Python.h"
+
+#include <stdio.h>
+#include <math.h>
+#include <signal.h>
+#include <ctype.h>
+
+#include "numpy/ndarrayobject.h"
+
+npy_float64 fast_interpolate(int ds[3], int ci[3], npy_float64 dp[3],
+                             npy_float64 *data);
+
+npy_float64 offset_interpolate(int ds[3], npy_float64 dp[3], npy_float64 *data);
+
+npy_float64 trilinear_interpolate(int ds[3], int ci[3], npy_float64 dp[3],
+				  npy_float64 *data);
+
+npy_float64 eval_gradient(int ds[3], int ci[3], npy_float64 dp[3],
+				  npy_float64 *data, npy_float64 *grad);
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/Interpolators.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/Interpolators.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,116 @@
+"""
+Simple interpolators
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import numpy as np
+cimport numpy as np
+cimport cython
+
+@cython.boundscheck(False)
+def UnilinearlyInterpolate(np.ndarray[np.float64_t, ndim=1] table,
+                           np.ndarray[np.float64_t, ndim=1] x_vals,
+                           np.ndarray[np.float64_t, ndim=1] x_bins,
+                           np.ndarray[np.int32_t, ndim=1] x_is,
+                           np.ndarray[np.float64_t, ndim=1] output):
+    cdef double x, xp, xm
+    cdef int i, x_i, y_i
+    for i in range(x_vals.shape[0]):
+        x_i = x_is[i]
+        x = x_vals[i]
+        dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
+        xp = (x - x_bins[x_i]) * dx_inv
+        xm = (x_bins[x_i+1] - x) * dx_inv
+        output[i]  = table[x_i  ] * (xm) \
+                   + table[x_i+1] * (xp)
+
+@cython.boundscheck(False)
+def BilinearlyInterpolate(np.ndarray[np.float64_t, ndim=2] table,
+                          np.ndarray[np.float64_t, ndim=1] x_vals,
+                          np.ndarray[np.float64_t, ndim=1] y_vals,
+                          np.ndarray[np.float64_t, ndim=1] x_bins,
+                          np.ndarray[np.float64_t, ndim=1] y_bins,
+                          np.ndarray[np.int32_t, ndim=1] x_is,
+                          np.ndarray[np.int32_t, ndim=1] y_is,
+                          np.ndarray[np.float64_t, ndim=1] output):
+    cdef double x, xp, xm
+    cdef double y, yp, ym
+    cdef double dx_inv, dy_inv
+    cdef int i, x_i, y_i
+    for i in range(x_vals.shape[0]):
+        x_i = x_is[i]
+        y_i = y_is[i]
+        x = x_vals[i]
+        y = y_vals[i]
+        dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
+        dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
+        xp = (x - x_bins[x_i]) * dx_inv
+        yp = (y - y_bins[y_i]) * dy_inv
+        xm = (x_bins[x_i+1] - x) * dx_inv
+        ym = (y_bins[y_i+1] - y) * dy_inv
+        output[i]  = table[x_i  , y_i  ] * (xm*ym) \
+                   + table[x_i+1, y_i  ] * (xp*ym) \
+                   + table[x_i  , y_i+1] * (xm*yp) \
+                   + table[x_i+1, y_i+1] * (xp*yp)
+
+@cython.boundscheck(False)
+def TrilinearlyInterpolate(np.ndarray[np.float64_t, ndim=3] table,
+                           np.ndarray[np.float64_t, ndim=1] x_vals,
+                           np.ndarray[np.float64_t, ndim=1] y_vals,
+                           np.ndarray[np.float64_t, ndim=1] z_vals,
+                           np.ndarray[np.float64_t, ndim=1] x_bins,
+                           np.ndarray[np.float64_t, ndim=1] y_bins,
+                           np.ndarray[np.float64_t, ndim=1] z_bins,
+                           np.ndarray[np.int_t, ndim=1] x_is,
+                           np.ndarray[np.int_t, ndim=1] y_is,
+                           np.ndarray[np.int_t, ndim=1] z_is,
+                           np.ndarray[np.float64_t, ndim=1] output):
+    cdef double x, xp, xm
+    cdef double y, yp, ym
+    cdef double z, zp, zm
+    cdef double dx_inv, dy_inv, dz_inv
+    cdef int i, x_i, y_i, z_i
+    for i in range(x_vals.shape[0]):
+        x_i = x_is[i]
+        y_i = y_is[i]
+        z_i = z_is[i]
+        x = x_vals[i]
+        y = y_vals[i]
+        z = z_vals[i]
+        dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
+        dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
+        dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])
+        xp = (x - x_bins[x_i]) * dx_inv
+        yp = (y - y_bins[y_i]) * dy_inv
+        zp = (z - z_bins[z_i]) * dz_inv
+        xm = (x_bins[x_i+1] - x) * dx_inv
+        ym = (y_bins[y_i+1] - y) * dy_inv
+        zm = (z_bins[z_i+1] - z) * dz_inv
+        output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \
+                   + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \
+                   + table[x_i  ,y_i+1,z_i  ] * (xm*yp*zm) \
+                   + table[x_i  ,y_i  ,z_i+1] * (xm*ym*zp) \
+                   + table[x_i+1,y_i  ,z_i+1] * (xp*ym*zp) \
+                   + table[x_i  ,y_i+1,z_i+1] * (xm*yp*zp) \
+                   + table[x_i+1,y_i+1,z_i  ] * (xp*yp*zm) \
+                   + table[x_i+1,y_i+1,z_i+1] * (xp*yp*zp)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/Octree.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/Octree.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,280 @@
+"""
+A refine-by-two AMR-specific octree
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: UCSD
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+
+import numpy as np
+cimport numpy as np
+# Double up here for def'd functions
+cimport numpy as cnp
+cimport cython
+
+from stdlib cimport malloc, free, abs
+
+cdef extern from "stdlib.h":
+    # NOTE that size_t might not be int
+    void *alloca(int)
+
+cdef struct OctreeNode:
+    np.float64_t *val
+    np.float64_t weight_val
+    np.int64_t pos[3]
+    int level
+    int nvals
+    OctreeNode *children[2][2][2]
+
+cdef void OTN_add_value(OctreeNode *self,
+        np.float64_t *val, np.float64_t weight_val):
+    cdef int i
+    for i in range(self.nvals):
+        self.val[i] += val[i]
+    self.weight_val += weight_val
+
+cdef void OTN_refine(OctreeNode *self):
+    cdef int i, j, i1, j1
+    cdef np.int64_t npos[3]
+    cdef OctreeNode *node
+    for i in range(2):
+        npos[0] = self.pos[0] * 2 + i
+        for j in range(2):
+            npos[1] = self.pos[1] * 2 + j
+            # We have to be careful with allocation...
+            for k in range(2):
+                npos[2] = self.pos[2] * 2 + k
+                self.children[i][j][k] = OTN_initialize(
+                            npos,
+                            self.nvals, self.val, self.weight_val,
+                            self.level + 1)
+    for i in range(self.nvals): self.val[i] = 0.0
+    self.weight_val = 0.0
+
+cdef OctreeNode *OTN_initialize(np.int64_t pos[3], int nvals,
+                        np.float64_t *val, np.float64_t weight_val,
+                        int level):
+    cdef OctreeNode *node
+    cdef int i, j
+    node = <OctreeNode *> malloc(sizeof(OctreeNode))
+    node.pos[0] = pos[0]
+    node.pos[1] = pos[1]
+    node.pos[2] = pos[2]
+    node.nvals = nvals
+    node.val = <np.float64_t *> malloc(
+                nvals * sizeof(np.float64_t))
+    for i in range(nvals):
+        node.val[i] = val[i]
+    node.weight_val = weight_val
+    for i in range(2):
+        for j in range(2):
+            for k in range(2):
+                node.children[i][j][k] = NULL
+    node.level = level
+    return node
+
+cdef void OTN_free(OctreeNode *node):
+    cdef int i, j
+    for i in range(2):
+        for j in range(2):
+            for k in range(2):
+                if node.children[i][j][k] == NULL: continue
+                OTN_free(node.children[i][j][k])
+    free(node.val)
+    free(node)
+
+cdef class Octree:
+    cdef int nvals
+    cdef np.int64_t po2[80]
+    cdef OctreeNode ****root_nodes
+    cdef np.int64_t top_grid_dims[3]
+
+    def __cinit__(self, np.ndarray[np.int64_t, ndim=1] top_grid_dims,
+                  int nvals):
+        cdef int i, j
+        cdef OctreeNode *node
+        cdef np.int64_t pos[3]
+        cdef np.float64_t *vals = <np.float64_t *> alloca(
+                sizeof(np.float64_t)*nvals)
+        cdef np.float64_t weight_val = 0.0
+        self.nvals = nvals
+        for i in range(nvals): vals[i] = 0.0
+
+        self.top_grid_dims[0] = top_grid_dims[0]
+        self.top_grid_dims[1] = top_grid_dims[1]
+        self.top_grid_dims[2] = top_grid_dims[2]
+
+        # This wouldn't be necessary if we did bitshifting...
+        for i in range(80):
+            self.po2[i] = 2**i
+        # Cython doesn't seem to like sizeof(OctreeNode ***)
+        self.root_nodes = <OctreeNode ****> \
+            malloc(sizeof(void*) * top_grid_dims[0])
+
+        # We initialize our root values to 0.0.
+        for i in range(top_grid_dims[0]):
+            pos[0] = i
+            self.root_nodes[i] = <OctreeNode ***> \
+                malloc(sizeof(OctreeNode **) * top_grid_dims[1])
+            for j in range(top_grid_dims[1]):
+                pos[1] = j
+                self.root_nodes[i][j] = <OctreeNode **> \
+                    malloc(sizeof(OctreeNode *) * top_grid_dims[1])
+                for k in range(top_grid_dims[2]):
+                    pos[2] = k
+                    self.root_nodes[i][j][k] = OTN_initialize(
+                        pos, nvals, vals, weight_val, 0)
+
+    cdef void add_to_position(self,
+                 int level, np.int64_t pos[3],
+                 np.float64_t *val,
+                 np.float64_t weight_val):
+        cdef int i, j
+        cdef OctreeNode *node
+        node = self.find_on_root_level(pos, level)
+        cdef np.int64_t fac
+        for L in range(level):
+            if node.children[0][0][0] == NULL:
+                OTN_refine(node)
+            # Maybe we should use bitwise operators?
+            fac = self.po2[level - L - 1]
+            i = (pos[0] >= fac*(2*node.pos[0]+1))
+            j = (pos[1] >= fac*(2*node.pos[1]+1))
+            k = (pos[2] >= fac*(2*node.pos[2]+1))
+            node = node.children[i][j][k]
+        OTN_add_value(node, val, weight_val)
+            
+    cdef OctreeNode *find_on_root_level(self, np.int64_t pos[3], int level):
+        # We need this because the root level won't just have four children
+        # So we find on the root level, then we traverse the tree.
+        cdef np.int64_t i, j
+        i = <np.int64_t> (pos[0] / self.po2[level])
+        j = <np.int64_t> (pos[1] / self.po2[level])
+        k = <np.int64_t> (pos[2] / self.po2[level])
+        return self.root_nodes[i][j][k]
+        
+    
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    def add_array_to_tree(self, int level,
+            np.ndarray[np.int64_t, ndim=1] pxs,
+            np.ndarray[np.int64_t, ndim=1] pys,
+            np.ndarray[np.int64_t, ndim=1] pzs,
+            np.ndarray[np.float64_t, ndim=2] pvals,
+            np.ndarray[np.float64_t, ndim=1] pweight_vals):
+        cdef int np = pxs.shape[0]
+        cdef int p
+        cdef cnp.float64_t *vals
+        cdef cnp.float64_t *data = <cnp.float64_t *> pvals.data
+        cdef cnp.int64_t pos[3]
+        for p in range(np):
+            vals = data + self.nvals*p
+            pos[0] = pxs[p]
+            pos[1] = pys[p]
+            pos[2] = pzs[p]
+            self.add_to_position(level, pos, vals, pweight_vals[p])
+
+    def add_grid_to_tree(self, int level,
+                         np.ndarray[np.int64_t, ndim=1] start_index,
+                         np.ndarray[np.float64_t, ndim=2] pvals,
+                         np.ndarray[np.float64_t, ndim=2] wvals,
+                         np.ndarray[np.int32_t, ndim=2] cm):
+        pass
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    def get_all_from_level(self, int level, int count_only = 0):
+        cdef int i, j
+        cdef int total = 0
+        vals = []
+        for i in range(self.top_grid_dims[0]):
+            for j in range(self.top_grid_dims[1]):
+                for k in range(self.top_grid_dims[2]):
+                    total += self.count_at_level(self.root_nodes[i][j][k], level)
+        if count_only: return total
+        # Allocate our array
+        cdef np.ndarray[np.int64_t, ndim=2] npos
+        cdef np.ndarray[np.float64_t, ndim=2] nvals
+        cdef np.ndarray[np.float64_t, ndim=1] nwvals
+        npos = np.zeros( (total, 2), dtype='int64')
+        nvals = np.zeros( (total, self.nvals), dtype='float64')
+        nwvals = np.zeros( total, dtype='float64')
+        cdef np.int64_t curpos = 0
+        cdef np.int64_t *pdata = <np.int64_t *> npos.data
+        cdef np.float64_t *vdata = <np.float64_t *> nvals.data
+        cdef np.float64_t *wdata = <np.float64_t *> nwvals.data
+        for i in range(self.top_grid_dims[0]):
+            for j in range(self.top_grid_dims[1]):
+                for k in range(self.top_grid_dims[2]):
+                    curpos += self.fill_from_level(self.root_nodes[i][j][k],
+                        level, curpos, pdata, vdata, wdata)
+        return npos, nvals, nwvals
+
+    cdef int count_at_level(self, OctreeNode *node, int level):
+        cdef int i, j
+        # We only really return a non-zero, calculated value if we are at the
+        # level in question.
+        if node.level == level:
+            # We return 1 if there are no finer points at this level and zero
+            # if there are
+            return (node.children[0][0][0] == NULL)
+        if node.children[0][0][0] == NULL: return 0
+        cdef int count = 0
+        for i in range(2):
+            for j in range(2):
+                for k in range(2):
+                    count += self.count_at_level(node.children[i][j][k], level)
+        return count
+
+    cdef int fill_from_level(self, OctreeNode *node, int level,
+                              np.int64_t curpos,
+                              np.int64_t *pdata,
+                              np.float64_t *vdata,
+                              np.float64_t *wdata):
+        cdef int i, j
+        if node.level == level:
+            if node.children[0][0][0] != NULL: return 0
+            for i in range(self.nvals):
+                vdata[self.nvals * curpos + i] = node.val[i]
+            wdata[curpos] = node.weight_val
+            pdata[curpos * 3] = node.pos[0]
+            pdata[curpos * 3 + 1] = node.pos[1]
+            pdata[curpos * 3 + 2] = node.pos[2]
+            return 1
+        if node.children[0][0] == NULL: return 0
+        cdef np.int64_t added = 0
+        for i in range(2):
+            for j in range(2):
+                for k in range(2):
+                    added += self.fill_from_level(node.children[i][j][k],
+                            level, curpos + added, pdata, vdata, wdata)
+        return added
+
+    def __dealloc__(self):
+        cdef int i, j
+        for i in range(self.top_grid_dims[0]):
+            for j in range(self.top_grid_dims[1]):
+                for k in range(self.top_grid_dims[2]):
+                    OTN_free(self.root_nodes[i][j][k])
+                free(self.root_nodes[i][j])
+            free(self.root_nodes[i])
+        free(self.root_nodes)
+
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/PointsInVolume.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/PointsInVolume.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,217 @@
+"""
+Checks for points contained in a volume
+
+Author: John Wise <jwise77@gmail.com>
+Affiliation: Princeton
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2009 John.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+
+import numpy as np
+cimport numpy as np
+cimport cython
+
+cdef extern from "math.h":
+    double fabs(double x)
+
+@cython.wraparound(False)
+@cython.boundscheck(False)
+def planar_points_in_volume(
+                   np.ndarray[np.float64_t, ndim=2] points,
+                   np.ndarray[np.int8_t, ndim=1] pmask,  # pixel mask
+                   np.ndarray[np.float64_t, ndim=1] left_edge,
+                   np.ndarray[np.float64_t, ndim=1] right_edge,
+                   np.ndarray[np.int32_t, ndim=3] mask,
+                   float dx):
+    cdef np.ndarray[np.int8_t, ndim=1] \
+         valid = np.zeros(points.shape[0], dtype='int8')
+    cdef int i, dim, count
+    cdef int ex
+    cdef double dx_inv
+    cdef unsigned int idx[3]
+    count = 0
+    dx_inv = 1.0 / dx
+    for i in xrange(points.shape[0]):
+        if pmask[i] == 0:
+            continue
+        ex = 1
+        for dim in xrange(3):
+            if points[i,dim] < left_edge[dim] or points[i,dim] > right_edge[dim]:
+                valid[i] = ex = 0
+                break
+        if ex == 1:
+            for dim in xrange(3):
+                idx[dim] = <unsigned int> \
+                           ((points[i,dim] - left_edge[dim]) * dx_inv)
+            if mask[idx[0], idx[1], idx[2]] == 1:
+                valid[i] = 1
+                count += 1
+
+    cdef np.ndarray[np.int32_t, ndim=1] result = np.empty(count, dtype='int32')
+    count = 0
+    for i in xrange(points.shape[0]):
+        if valid[i] == 1 and pmask[i] == 1:
+            result[count] = i
+            count += 1
+        
+    return result
+
+cdef inline void set_rotated_pos(
+            np.float64_t cp[3], np.float64_t rdds[3][3],
+            np.float64_t rorigin[3], int i, int j, int k):
+    cdef int oi
+    for oi in range(3):
+        cp[oi] = rdds[0][oi] * (0.5 + i) \
+               + rdds[1][oi] * (0.5 + j) \
+               + rdds[2][oi] * (0.5 + k) \
+               + rorigin[oi]
+
+#@cython.wraparound(False)
+#@cython.boundscheck(False)
+def grid_points_in_volume(
+                   np.ndarray[np.float64_t, ndim=1] box_lengths,
+                   np.ndarray[np.float64_t, ndim=1] box_origin,
+                   np.ndarray[np.float64_t, ndim=2] rot_mat,
+                   np.ndarray[np.float64_t, ndim=1] grid_left_edge,
+                   np.ndarray[np.float64_t, ndim=1] grid_right_edge,
+                   np.ndarray[np.float64_t, ndim=1] dds,
+                   np.ndarray[np.int32_t, ndim=3] mask,
+                   int break_first):
+    cdef int n[3], i, j, k, ax
+    cdef np.float64_t rds[3][3], cur_pos[3], rorigin[3]
+    for i in range(3):
+        rorigin[i] = 0.0
+    for i in range(3):
+        n[i] = mask.shape[i]
+        for j in range(3):
+            # Set up our transposed dx, which has a component in every
+            # direction
+            rds[i][j] = dds[i] * rot_mat[j,i]
+            # In our rotated coordinate system, the box origin is 0,0,0
+            # so we subtract the box_origin from the grid_origin and rotate
+            # that
+            rorigin[j] += (grid_left_edge[i] - box_origin[i]) * rot_mat[j,i]
+
+    for i in range(n[0]):
+        for j in range(n[1]):
+            for k in range(n[2]):
+                set_rotated_pos(cur_pos, rds, rorigin, i, j, k)
+                if (cur_pos[0] > box_lengths[0]): continue
+                if (cur_pos[1] > box_lengths[1]): continue
+                if (cur_pos[2] > box_lengths[2]): continue
+                if (cur_pos[0] < 0.0): continue
+                if (cur_pos[1] < 0.0): continue
+                if (cur_pos[2] < 0.0): continue
+                if break_first:
+                    if mask[i,j,k]: return 1
+                else:
+                    mask[i,j,k] = 1
+    return 0
+
+cdef void normalize_vector(np.float64_t vec[3]):
+    cdef int i
+    cdef np.float64_t norm = 0.0
+    for i in range(3):
+        norm += vec[i]*vec[i]
+    norm = norm**0.5
+    for i in range(3):
+        vec[i] /= norm
+
+cdef void get_cross_product(np.float64_t v1[3],
+                            np.float64_t v2[3],
+                            np.float64_t cp[3]):
+    cp[0] = v1[1]*v2[2] - v1[2]*v2[1]
+    cp[1] = v1[3]*v2[0] - v1[0]*v2[3]
+    cp[2] = v1[0]*v2[1] - v1[1]*v2[0]
+    #print cp[0], cp[1], cp[2]
+
+cdef int check_projected_overlap(
+        np.float64_t sep_ax[3], np.float64_t sep_vec[3], int gi,
+        np.float64_t b_vec[3][3], np.float64_t g_vec[3][3]):
+    cdef int g_ax, b_ax
+    cdef np.float64_t tba, tga, ba, ga, sep_dot
+    ba = ga = sep_dot = 0.0
+    for g_ax in range(3):
+        # We need the grid vectors, which we'll precompute here
+        tba = tga = 0.0
+        for b_ax in range(3):
+            tba += b_vec[g_ax][b_ax] * sep_vec[b_ax]
+            tga += g_vec[g_ax][b_ax] * sep_vec[b_ax]
+        ba += fabs(tba)
+        ga += fabs(tga)
+        sep_dot += sep_vec[g_ax] * sep_ax[g_ax]
+    #print sep_vec[0], sep_vec[1], sep_vec[2],
+    #print sep_ax[0], sep_ax[1], sep_ax[2]
+    return (fabs(sep_dot) > ba+ga)
+    # Now we do 
+
+@cython.wraparound(False)
+@cython.boundscheck(False)
+def find_grids_in_inclined_box(
+        np.ndarray[np.float64_t, ndim=2] box_vectors,
+        np.ndarray[np.float64_t, ndim=1] box_center,
+        np.ndarray[np.float64_t, ndim=2] grid_left_edges,
+        np.ndarray[np.float64_t, ndim=2] grid_right_edges):
+
+    # http://www.gamasutra.com/view/feature/3383/simple_intersection_tests_for_games.php?page=5
+    cdef int n = grid_right_edges.shape[0]
+    cdef int g_ax, b_ax, gi
+    cdef np.float64_t b_vec[3][3], g_vec[3][3], a_vec[3][3], sep_ax[15][3]
+    cdef np.float64_t sep_vec[3], norm
+    cdef np.ndarray[np.int32_t, ndim=1] good = np.zeros(n, dtype='int32')
+    cdef np.ndarray[np.float64_t, ndim=2] grid_centers
+    # Fill in our axis unit vectors
+    for b_ax in range(3):
+        for g_ax in range(3):
+            a_vec[b_ax][g_ax] = <np.float64_t> (b_ax == g_ax)
+    grid_centers = (grid_right_edges + grid_left_edges)/2.0
+
+    # Now we pre-compute our candidate separating axes, because the unit
+    # vectors for all the grids are identical
+    for b_ax in range(3):
+        # We have 6 principal axes we already know, which are the grid (domain)
+        # principal axes and the box axes
+        sep_ax[b_ax][0] = sep_ax[b_ax][1] = sep_ax[b_ax][2] = 0.0
+        sep_ax[b_ax][b_ax] = 1.0 # delta_ijk, for grid axes
+        for g_ax in range(3):
+            b_vec[b_ax][g_ax] = 0.5*box_vectors[b_ax,g_ax]
+            sep_ax[b_ax + 3][g_ax] = b_vec[b_ax][g_ax] # box axes
+        normalize_vector(sep_ax[b_ax + 3])
+        for g_ax in range(3):
+            get_cross_product(b_vec[b_ax], a_vec[g_ax], sep_ax[b_ax*3 + g_ax + 6])
+            normalize_vector(sep_ax[b_ax*3 + g_ax + 6])
+
+    for gi in range(n):
+        for g_ax in range(3):
+            # Calculate the separation vector
+            sep_vec[g_ax] = grid_centers[gi, g_ax] - box_center[g_ax]
+            # Calculate the grid axis lengths
+            g_vec[g_ax][0] = g_vec[g_ax][1] = g_vec[g_ax][2] = 0.0
+            g_vec[g_ax][g_ax] = 0.5 * (grid_right_edges[gi, g_ax]
+                                     - grid_left_edges[gi, g_ax])
+        for b_ax in range(15):
+            #print b_ax,
+            if check_projected_overlap(
+                        sep_ax[b_ax], sep_vec, gi,
+                        b_vec,  g_vec):
+                good[gi] = 1
+                break
+    return good
+
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/QuadTree.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/QuadTree.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,257 @@
+"""
+A refine-by-two AMR-specific quadtree
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: UCSD
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+
+import numpy as np
+cimport numpy as np
+# Double up here for def'd functions
+cimport numpy as cnp
+cimport cython
+
+from stdlib cimport malloc, free, abs
+
+cdef extern from "stdlib.h":
+    # NOTE that size_t might not be int
+    void *alloca(int)
+
+cdef struct QuadTreeNode:
+    np.float64_t *val
+    np.float64_t weight_val
+    np.int64_t pos[2]
+    int level
+    int nvals
+    QuadTreeNode *children[2][2]
+
+cdef void QTN_add_value(QuadTreeNode *self,
+        np.float64_t *val, np.float64_t weight_val):
+    cdef int i
+    for i in range(self.nvals):
+        self.val[i] += val[i]
+    self.weight_val += weight_val
+
+cdef void QTN_refine(QuadTreeNode *self):
+    cdef int i, j, i1, j1
+    cdef np.int64_t npos[2]
+    cdef QuadTreeNode *node
+    for i in range(2):
+        npos[0] = self.pos[0] * 2 + i
+        for j in range(2):
+            npos[1] = self.pos[1] * 2 + j
+            # We have to be careful with allocation...
+            self.children[i][j] = QTN_initialize(
+                        npos,
+                        self.nvals, self.val, self.weight_val,
+                        self.level + 1)
+    for i in range(self.nvals): self.val[i] = 0.0
+    self.weight_val = 0.0
+
+cdef QuadTreeNode *QTN_initialize(np.int64_t pos[2], int nvals,
+                        np.float64_t *val, np.float64_t weight_val,
+                        int level):
+    cdef QuadTreeNode *node
+    cdef int i, j
+    node = <QuadTreeNode *> malloc(sizeof(QuadTreeNode))
+    node.pos[0] = pos[0]
+    node.pos[1] = pos[1]
+    node.nvals = nvals
+    node.val = <np.float64_t *> malloc(
+                nvals * sizeof(np.float64_t))
+    for i in range(nvals):
+        node.val[i] = val[i]
+    node.weight_val = weight_val
+    for i in range(2):
+        for j in range(2):
+            node.children[i][j] = NULL
+    node.level = level
+    return node
+
+cdef void QTN_free(QuadTreeNode *node):
+    cdef int i, j
+    for i in range(2):
+        for j in range(2):
+            if node.children[i][j] == NULL: continue
+            QTN_free(node.children[i][j])
+    free(node.val)
+    free(node)
+
+cdef class QuadTree:
+    cdef int nvals
+    cdef np.int64_t po2[80]
+    cdef QuadTreeNode ***root_nodes
+    cdef np.int64_t top_grid_dims[2]
+
+    def __cinit__(self, np.ndarray[np.int64_t, ndim=1] top_grid_dims,
+                  int nvals):
+        cdef int i, j
+        cdef QuadTreeNode *node
+        cdef np.int64_t pos[2]
+        cdef np.float64_t *vals = <np.float64_t *> alloca(
+                sizeof(np.float64_t)*nvals)
+        cdef np.float64_t weight_val = 0.0
+        self.nvals = nvals
+        for i in range(nvals): vals[i] = 0.0
+
+        self.top_grid_dims[0] = top_grid_dims[0]
+        self.top_grid_dims[1] = top_grid_dims[1]
+
+        # This wouldn't be necessary if we did bitshifting...
+        for i in range(80):
+            self.po2[i] = 2**i
+        self.root_nodes = <QuadTreeNode ***> \
+            malloc(sizeof(QuadTreeNode **) * top_grid_dims[0])
+
+        # We initialize our root values to 0.0.
+        for i in range(top_grid_dims[0]):
+            pos[0] = i
+            self.root_nodes[i] = <QuadTreeNode **> \
+                malloc(sizeof(QuadTreeNode *) * top_grid_dims[1])
+            for j in range(top_grid_dims[1]):
+                pos[1] = j
+                self.root_nodes[i][j] = QTN_initialize(
+                    pos, nvals, vals, weight_val, 0)
+
+    cdef void add_to_position(self,
+                 int level, np.int64_t pos[2],
+                 np.float64_t *val,
+                 np.float64_t weight_val):
+        cdef int i, j
+        cdef QuadTreeNode *node
+        node = self.find_on_root_level(pos, level)
+        cdef np.int64_t fac
+        for L in range(level):
+            if node.children[0][0] == NULL:
+                QTN_refine(node)
+            # Maybe we should use bitwise operators?
+            fac = self.po2[level - L - 1]
+            i = (pos[0] >= fac*(2*node.pos[0]+1))
+            j = (pos[1] >= fac*(2*node.pos[1]+1))
+            node = node.children[i][j]
+        QTN_add_value(node, val, weight_val)
+            
+    cdef QuadTreeNode *find_on_root_level(self, np.int64_t pos[2], int level):
+        # We need this because the root level won't just have four children
+        # So we find on the root level, then we traverse the tree.
+        cdef np.int64_t i, j
+        i = <np.int64_t> (pos[0] / self.po2[level])
+        j = <np.int64_t> (pos[1] / self.po2[level])
+        return self.root_nodes[i][j]
+        
+    
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    def add_array_to_tree(self, int level,
+            np.ndarray[np.int64_t, ndim=1] pxs,
+            np.ndarray[np.int64_t, ndim=1] pys,
+            np.ndarray[np.float64_t, ndim=2] pvals,
+            np.ndarray[np.float64_t, ndim=1] pweight_vals):
+        cdef int np = pxs.shape[0]
+        cdef int p
+        cdef cnp.float64_t *vals
+        cdef cnp.float64_t *data = <cnp.float64_t *> pvals.data
+        cdef cnp.int64_t pos[2]
+        for p in range(np):
+            vals = data + self.nvals*p
+            pos[0] = pxs[p]
+            pos[1] = pys[p]
+            self.add_to_position(level, pos, vals, pweight_vals[p])
+
+    def add_grid_to_tree(self, int level,
+                         np.ndarray[np.int64_t, ndim=1] start_index,
+                         np.ndarray[np.float64_t, ndim=2] pvals,
+                         np.ndarray[np.float64_t, ndim=2] wvals,
+                         np.ndarray[np.int32_t, ndim=2] cm):
+        pass
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    def get_all_from_level(self, int level, int count_only = 0):
+        cdef int i, j
+        cdef int total = 0
+        vals = []
+        for i in range(self.top_grid_dims[0]):
+            for j in range(self.top_grid_dims[1]):
+                total += self.count_at_level(self.root_nodes[i][j], level)
+        if count_only: return total
+        # Allocate our array
+        cdef np.ndarray[np.int64_t, ndim=2] npos
+        cdef np.ndarray[np.float64_t, ndim=2] nvals
+        cdef np.ndarray[np.float64_t, ndim=1] nwvals
+        npos = np.zeros( (total, 2), dtype='int64')
+        nvals = np.zeros( (total, self.nvals), dtype='float64')
+        nwvals = np.zeros( total, dtype='float64')
+        cdef np.int64_t curpos = 0
+        cdef np.int64_t *pdata = <np.int64_t *> npos.data
+        cdef np.float64_t *vdata = <np.float64_t *> nvals.data
+        cdef np.float64_t *wdata = <np.float64_t *> nwvals.data
+        for i in range(self.top_grid_dims[0]):
+            for j in range(self.top_grid_dims[1]):
+                curpos += self.fill_from_level(self.root_nodes[i][j],
+                    level, curpos, pdata, vdata, wdata)
+        return npos, nvals, nwvals
+
+    cdef int count_at_level(self, QuadTreeNode *node, int level):
+        cdef int i, j
+        # We only really return a non-zero, calculated value if we are at the
+        # level in question.
+        if node.level == level:
+            # We return 1 if there are no finer points at this level and zero
+            # if there are
+            return (node.children[0][0] == NULL)
+        if node.children[0][0] == NULL: return 0
+        cdef int count = 0
+        for i in range(2):
+            for j in range(2):
+                count += self.count_at_level(node.children[i][j], level)
+        return count
+
+    cdef int fill_from_level(self, QuadTreeNode *node, int level,
+                              np.int64_t curpos,
+                              np.int64_t *pdata,
+                              np.float64_t *vdata,
+                              np.float64_t *wdata):
+        cdef int i, j
+        if node.level == level:
+            if node.children[0][0] != NULL: return 0
+            for i in range(self.nvals):
+                vdata[self.nvals * curpos + i] = node.val[i]
+            wdata[curpos] = node.weight_val
+            pdata[curpos * 2] = node.pos[0]
+            pdata[curpos * 2 + 1] = node.pos[1]
+            return 1
+        if node.children[0][0] == NULL: return 0
+        cdef np.int64_t added = 0
+        for i in range(2):
+            for j in range(2):
+                added += self.fill_from_level(node.children[i][j],
+                        level, curpos + added, pdata, vdata, wdata)
+        return added
+
+    def __dealloc__(self):
+        cdef int i, j
+        for i in range(self.top_grid_dims[0]):
+            for j in range(self.top_grid_dims[1]):
+                QTN_free(self.root_nodes[i][j])
+            free(self.root_nodes[i])
+        free(self.root_nodes)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/RayIntegrators.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/RayIntegrators.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,374 @@
+"""
+Simle integrators for the radiative transfer equation
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import numpy as np
+cimport numpy as np
+cimport cython
+from stdlib cimport malloc, free, abs
+
+cdef extern from "math.h":
+    double exp(double x)
+    float expf(float x)
+
+@cython.boundscheck(False)
+def Transfer3D(np.ndarray[np.float64_t, ndim=3] i_s,
+               np.ndarray[np.float64_t, ndim=4] o_s,
+               np.ndarray[np.float64_t, ndim=4] e,
+               np.ndarray[np.float64_t, ndim=4] a,
+               int imin, int imax, int jmin, int jmax,
+               int kmin, int kmax, int istride, int jstride,
+               np.float64_t dx):
+    """
+    This function accepts an incoming slab (*i_s*), a buffer
+    for an outgoing set of values at every point in the grid (*o_s*),
+    an emission array (*e*), an absorption array (*a*), and dimensions of
+    the grid (*imin*, *imax*, *jmin*, *jmax*, *kmin*, *kmax*) as well
+    as strides in the *i* and *j* directions, and a *dx* of the grid being
+    integrated.
+    """
+    cdef int i, ii
+    cdef int j, jj
+    cdef int k, kk
+    cdef int n, nn
+    nn = o_s.shape[3] # This might be slow
+    cdef np.float64_t *temp = <np.float64_t *>malloc(sizeof(np.float64_t) * nn)
+    for i in range((imax-imin)*istride):
+        ii = i + imin*istride
+        for j in range((jmax-jmin)*jstride):
+            jj = j + jmin*jstride
+            # Not sure about the ordering of the loops here
+            for n in range(nn):
+                temp[n] = i_s[ii,jj,n] 
+            for k in range(kmax-kmin):
+                kk = k + kmin#*kstride, which doesn't make any sense
+                for n in range(nn):
+                    o_s[i,j,k,n] = temp[n] + dx*(e[i,j,k,n] - temp[n]*a[i,j,k,n])
+                    temp[n] = o_s[i,j,k,n]
+            for n in range(nn):
+                i_s[ii,jj,n] = temp[n]
+    free(temp)
+
+@cython.boundscheck(False)
+def TransferShells(np.ndarray[np.float64_t, ndim=3] i_s,
+                   np.ndarray[np.float64_t, ndim=3] data,
+                   np.ndarray[np.float64_t, ndim=2] shells):
+    """
+    This function accepts an incoming slab (*i_s*), a buffer of *data*,
+    and a list of shells specified as [ (value, tolerance, r, g, b), ... ].
+    """
+    cdef int i, ii
+    cdef int j, jj
+    cdef int k, kk
+    cdef int n, nn
+    cdef np.float64_t dist
+    ii = data.shape[0]
+    jj = data.shape[1]
+    kk = data.shape[2]
+    nn = shells.shape[0]
+    cdef float rgba[4]
+    cdef float alpha
+    for i in range(ii):
+        for j in range(jj):
+            # Not sure about the ordering of the loops here
+            for k in range(kk):
+                for n in range(nn):
+                    dist = shells[n, 0] - data[i,j,k]
+                    if dist < 0: dist *= -1.0
+                    if dist < shells[n,1]:
+                        dist = exp(-dist/8.0)
+                        rgba[0] = shells[n,2]
+                        rgba[1] = shells[n,3]
+                        rgba[2] = shells[n,4]
+                        rgba[3] = shells[n,5]
+                        alpha = i_s[i,j,3]
+                        dist *= dist # This might improve appearance
+                        i_s[i,j,0] += (1.0 - alpha)*rgba[0]*dist*rgba[3]
+                        i_s[i,j,1] += (1.0 - alpha)*rgba[1]*dist*rgba[3]
+                        i_s[i,j,2] += (1.0 - alpha)*rgba[2]*dist*rgba[3]
+                        i_s[i,j,3] += (1.0 - alpha)*rgba[3]*dist*rgba[3]
+                        break
+
+@cython.boundscheck(False)
+def Transfer1D(float i_s,
+               np.ndarray[np.float_t, ndim=1] o_s,
+               np.ndarray[np.float_t, ndim=1] e,
+               np.ndarray[np.float_t, ndim=1] a,
+               np.ndarray[np.float_t, ndim=1] dx,
+               int imin, int imax):
+    cdef int i
+    for i in range(imin, imax):
+        o_s[i] = i_s + dx[i]*(e[i] - i_s*a[i])
+        i_s = o_s[i]
+    return i_s
+
+@cython.wraparound(False)
+@cython.boundscheck(False)
+def VoxelTraversal(np.ndarray[np.int_t, ndim=3] grid_mask,
+                   np.ndarray[np.float64_t, ndim=3] grid_t,
+                   np.ndarray[np.float64_t, ndim=3] grid_dt,
+                   np.ndarray[np.float64_t, ndim=1] left_edge,
+                   np.ndarray[np.float64_t, ndim=1] right_edge,
+                   np.ndarray[np.float64_t, ndim=1] dx,
+                   np.ndarray[np.float64_t, ndim=1] u,
+                   np.ndarray[np.float64_t, ndim=1] v):
+    # We're roughly following Amanatides & Woo
+    # Find the first place the ray hits the grid on its path
+    # Do left edge then right edge in each dim
+    cdef int i, x, y
+    cdef np.float64_t tl, tr, intersect_t, enter_t, exit_t, dt_tolerance
+    cdef np.ndarray[np.int64_t,   ndim=1] step = np.empty((3,), dtype=np.int64)
+    cdef np.ndarray[np.int64_t,   ndim=1] cur_ind = np.empty((3,), dtype=np.int64)
+    cdef np.ndarray[np.float64_t, ndim=1] tdelta = np.empty((3,), dtype=np.float64)
+    cdef np.ndarray[np.float64_t, ndim=1] tmax = np.empty((3,), dtype=np.float64)
+    cdef np.ndarray[np.float64_t, ndim=1] intersect = np.empty((3,), dtype=np.float64)
+    intersect_t = 1
+    dt_tolerance = 1e-6
+    # recall p = v * t + u
+    #  where p is position, v is our vector, u is the start point
+    for i in range(3):
+        # As long as we're iterating, set some other stuff, too
+        if(v[i] < 0): step[i] = -1
+        else: step[i] = 1
+        x = (i+1)%3
+        y = (i+2)%3
+        tl = (left_edge[i] - u[i])/v[i]
+        tr = (right_edge[i] - u[i])/v[i]
+        if (left_edge[x] <= (u[x] + tl*v[x]) <= right_edge[x]) and \
+           (left_edge[y] <= (u[y] + tl*v[y]) <= right_edge[y]) and \
+           (0.0 <= tl < intersect_t):
+            intersect_t = tl
+        if (left_edge[x] <= (u[x] + tr*v[x]) <= right_edge[x]) and \
+           (left_edge[y] <= (u[y] + tr*v[y]) <= right_edge[y]) and \
+           (0.0 <= tr < intersect_t):
+            intersect_t = tr
+    # if fully enclosed
+    if (left_edge[0] <= u[0] <= right_edge[0]) and \
+       (left_edge[1] <= u[1] <= right_edge[1]) and \
+       (left_edge[2] <= u[2] <= right_edge[2]):
+        intersect_t = 0.0
+    if not (0 <= intersect_t <= 1): return
+    # Now get the indices of the intersection
+    intersect = u + intersect_t * v
+    for i in range(3):
+        cur_ind[i] = np.floor((intersect[i] + 1e-8*dx[i] - left_edge[i])/dx[i])
+        tmax[i] = (((cur_ind[i]+step[i])*dx[i])+left_edge[i]-u[i])/v[i]
+        if cur_ind[i] == grid_mask.shape[i] and step[i] < 0:
+            cur_ind[i] = grid_mask.shape[i] - 1
+        if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]
+        if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
+        tdelta[i] = (dx[i]/v[i])
+        if tdelta[i] < 0: tdelta[i] *= -1
+    # The variable intersect contains the point we first pierce the grid
+    enter_t = intersect_t
+    while 1:
+        if (not (0 <= cur_ind[0] < grid_mask.shape[0])) or \
+           (not (0 <= cur_ind[1] < grid_mask.shape[1])) or \
+           (not (0 <= cur_ind[2] < grid_mask.shape[2])):
+            break
+        # Note that we are calculating t on the fly, but we get *negative* t
+        # values from what they should be.
+        # If we've reached t = 1, we are done.
+        grid_mask[cur_ind[0], cur_ind[1], cur_ind[2]] = 1
+        if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
+            grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = 1.0 - enter_t
+            break
+        if tmax[0] < tmax[1]:
+            if tmax[0] < tmax[2]:
+                grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
+                grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[0] - enter_t
+                enter_t = tmax[0]
+                tmax[0] += tdelta[0]
+                cur_ind[0] += step[0]
+            else:
+                grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
+                grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[2] - enter_t
+                enter_t = tmax[2]
+                tmax[2] += tdelta[2]
+                cur_ind[2] += step[2]
+        else:
+            if tmax[1] < tmax[2]:
+                grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
+                grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[1] - enter_t
+                enter_t = tmax[1]
+                tmax[1] += tdelta[1]
+                cur_ind[1] += step[1]
+            else:
+                grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
+                grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[2] - enter_t
+                enter_t = tmax[2]
+                tmax[2] += tdelta[2]
+                cur_ind[2] += step[2]
+    return
+
+@cython.wraparound(False)
+@cython.boundscheck(False)
+def PlaneVoxelIntegration(np.ndarray[np.float64_t, ndim=1] left_edge,
+                          np.ndarray[np.float64_t, ndim=1] right_edge,
+                          np.ndarray[np.float64_t, ndim=1] dx,
+                          np.ndarray[np.float64_t, ndim=2] ug,
+                          np.ndarray[np.float64_t, ndim=1] v,
+                          np.ndarray[np.float64_t, ndim=2] image,
+                          np.ndarray[np.float64_t, ndim=3] data,
+                          np.ndarray[np.float64_t, ndim=2] shells):
+    # We're roughly following Amanatides & Woo on a ray-by-ray basis
+    # Note that for now it's just shells, but this can and should be
+    # generalized to transfer functions
+    cdef int i, x, y, vi
+    intersect_t = 1
+    dt_tolerance = 1e-6
+    cdef int nv = ug.shape[0]
+    cdef int nshells = shells.shape[0]
+    cdef np.ndarray[np.float64_t, ndim=1] u = np.empty((3,), dtype=np.float64)
+    # Copy things into temporary location for passing between functions
+    for vi in range(nv):
+        for i in range(3): u[i] = ug[vi, i]
+        integrate_ray(u, v, left_edge, right_edge, dx, 
+                      nshells, vi, data, shells, image)
+
+@cython.wraparound(False)
+@cython.boundscheck(False)
+def integrate_ray(np.ndarray[np.float64_t, ndim=1] u,
+                  np.ndarray[np.float64_t, ndim=1] v,
+                  np.ndarray[np.float64_t, ndim=1] left_edge,
+                  np.ndarray[np.float64_t, ndim=1] right_edge,
+                  np.ndarray[np.float64_t, ndim=1] dx,
+                  int nshells, int ind,
+                  np.ndarray[np.float64_t, ndim=3] data,
+                  np.ndarray[np.float64_t, ndim=2] shells,
+                  np.ndarray[np.float64_t, ndim=2] image):
+    cdef int step[3], x, y, i, n
+    cdef np.float64_t intersect_t = 1
+    cdef np.float64_t dt_tolerance = 1e-6
+    cdef np.float64_t tl, tr, enter_t, exit_t
+    cdef np.int64_t cur_ind[3]
+    cdef np.float64_t tdelta[3]
+    cdef np.float64_t tmax[3]
+    cdef np.float64_t intersect[3]
+    cdef np.float64_t dt, dv
+    cdef np.float64_t dist, alpha
+    cdef np.float64_t one = 1.0
+    cdef int dims[3]
+    cdef np.float64_t rgba[4], temp_x, temp_y
+    for i in range(3):
+        # As long as we're iterating, set some other stuff, too
+        dims[i] = data.shape[i]
+        if(v[i] < 0): step[i] = -1
+        else: step[i] = 1
+        x = (i+1)%3
+        y = (i+2)%3
+        tl = (left_edge[i] - u[i])/v[i]
+        tr = (right_edge[i] - u[i])/v[i]
+        temp_x = (u[x] + tl*v[x])
+        temp_y = (u[y] + tl*v[y])
+        if (left_edge[x] <= temp_x) and (temp_x <= right_edge[x]) and \
+           (left_edge[y] <= temp_y) and (temp_y <= right_edge[y]) and \
+           (0.0 <= tl) and (tl < intersect_t):
+            intersect_t = tl
+        temp_x = (u[x] + tr*v[x])
+        temp_y = (u[y] + tr*v[y])
+        if (left_edge[x] <= temp_x) and (temp_x <= right_edge[x]) and \
+           (left_edge[y] <= temp_y) and (temp_y <= right_edge[y]) and \
+           (0.0 <= tr) and (tr < intersect_t):
+            intersect_t = tr
+    # if fully enclosed
+    if (left_edge[0] <= u[0] <= right_edge[0]) and \
+       (left_edge[1] <= u[1] <= right_edge[1]) and \
+       (left_edge[2] <= u[2] <= right_edge[2]):
+        intersect_t = 0.0
+    if not (0 <= intersect_t <= 1):
+        #print "Returning: intersect_t ==", intersect_t
+        return
+    # Now get the indices of the intersection
+    for i in range(3): intersect[i] = u[i] + intersect_t * v[i]
+    cdef int ncells = 0
+    for i in range(3):
+        cur_ind[i] = np.floor((intersect[i] + 1e-8*dx[i] - left_edge[i])/dx[i])
+        tmax[i] = (((cur_ind[i]+step[i])*dx[i])+left_edge[i]-u[i])/v[i]
+        if cur_ind[i] == dims[i] and step[i] < 0:
+            cur_ind[i] = dims[i] - 1
+        if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]
+        if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
+        tdelta[i] = (dx[i]/v[i])
+        if tdelta[i] < 0: tdelta[i] *= -1
+    # The variable intersect contains the point we first pierce the grid
+    enter_t = intersect_t
+    if (not (0 <= cur_ind[0] < dims[0])) or \
+       (not (0 <= cur_ind[1] < dims[1])) or \
+       (not (0 <= cur_ind[2] < dims[2])):
+        #print "Returning: cur_ind", cur_ind[0], cur_ind[1], cur_ind[2]
+        #print "  dims:     ", dims[0], dims[1], dims[2]
+        #print "  intersect:",  intersect[0], intersect[1], intersect[2]
+        #print "  intersect:", intersect_t
+        #print "  u        :", u[0], u[1], u[2]
+        #
+        return
+    #print cur_ind[0], dims[0], cur_ind[1], dims[1], cur_ind[2], dims[2]
+    dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]
+    #dt = 1e300
+    while 1:
+        if image[ind,3] >= 1.0: break
+        if (not (0 <= cur_ind[0] < dims[0])) or \
+           (not (0 <= cur_ind[1] < dims[1])) or \
+           (not (0 <= cur_ind[2] < dims[2])):
+            break
+        # Do our transfer here
+        for n in range(nshells):
+            dist = shells[n, 0] - dv
+            if dist < shells[n,1]:
+                dist = exp(-dist/8.0)
+                alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
+                image[ind,0] += alpha*shells[n,2]*dist
+                image[ind,1] += alpha*shells[n,3]*dist
+                image[ind,2] += alpha*shells[n,4]*dist
+                image[ind,3] += alpha*shells[n,5]*dist
+                #image[ind,i] += rgba[i]*dist*rgba[3]/dt
+                #print rgba[i], image[ind,i], dist, dt
+                break
+        if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
+            dt = 1.0 - enter_t
+            break
+        if tmax[0] < tmax[1]:
+            if tmax[0] < tmax[2]:
+                dt = tmax[0] - enter_t
+                enter_t = tmax[0]
+                tmax[0] += tdelta[0]
+                cur_ind[0] += step[0]
+            else:
+                dt = tmax[2] - enter_t
+                enter_t = tmax[2]
+                tmax[2] += tdelta[2]
+                cur_ind[2] += step[2]
+        else:
+            if tmax[1] < tmax[2]:
+                dt = tmax[1] - enter_t
+                enter_t = tmax[1]
+                tmax[1] += tdelta[1]
+                cur_ind[1] += step[1]
+            else:
+                dt = tmax[2] - enter_t
+                enter_t = tmax[2]
+                tmax[2] += tdelta[2]
+                cur_ind[2] += step[2]
+        dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/VolumeIntegrator.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/VolumeIntegrator.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,656 @@
+"""
+Simple integrators for the radiative transfer equation
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2009 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import numpy as np
+cimport numpy as np
+cimport cython
+from stdlib cimport malloc, free, abs
+
+cdef inline int imax(int i0, int i1):
+    if i0 > i1: return i0
+    return i1
+
+cdef inline np.float64_t fmax(np.float64_t f0, np.float64_t f1):
+    if f0 > f1: return f0
+    return f1
+
+cdef inline int imin(int i0, int i1):
+    if i0 < i1: return i0
+    return i1
+
+cdef inline np.float64_t fmin(np.float64_t f0, np.float64_t f1):
+    if f0 < f1: return f0
+    return f1
+
+cdef inline int iclip(int i, int a, int b):
+    if i < a: return a
+    if i > b: return b
+    return i
+
+cdef inline np.float64_t fclip(np.float64_t f,
+                      np.float64_t a, np.float64_t b):
+    return fmin(fmax(f, a), b)
+
+cdef extern from "math.h":
+    double exp(double x)
+    float expf(float x)
+    double floor(double x)
+    double ceil(double x)
+    double fmod(double x, double y)
+    double log2(double x)
+    long int lrint(double x)
+
+cdef extern from "FixedInterpolator.h":
+    np.float64_t fast_interpolate(int ds[3], int ci[3], np.float64_t dp[3],
+                                  np.float64_t *data)
+    np.float64_t offset_interpolate(int ds[3], np.float64_t dp[3], np.float64_t *data)
+    np.float64_t trilinear_interpolate(int ds[3], int ci[3], np.float64_t dp[3],
+                                       np.float64_t *data)
+    np.float64_t eval_gradient(int *ds, int *ci, np.float64_t *dp,
+                                       np.float64_t *data, np.float64_t *grad)
+
+cdef class VectorPlane
+
+cdef struct FieldInterpolationTable:
+    # Note that we make an assumption about retaining a reference to values
+    # externally.
+    np.float64_t *values 
+    np.float64_t bounds[2]
+    np.float64_t dbin
+    np.float64_t idbin
+    int field_id
+    int weight_field_id
+    int weight_table_id
+    int nbins
+    int pass_through
+
+cdef void FIT_initialize_table(FieldInterpolationTable *fit, int nbins,
+              np.float64_t *values, np.float64_t bounds1, np.float64_t bounds2,
+              int field_id, int weight_field_id = -1, int weight_table_id = -1,
+              int pass_through = 0):
+    fit.bounds[0] = bounds1; fit.bounds[1] = bounds2
+    fit.nbins = nbins
+    fit.dbin = (fit.bounds[1] - fit.bounds[0])/fit.nbins
+    fit.idbin = 1.0/fit.dbin
+    # Better not pull this out from under us, yo
+    fit.values = values
+    fit.field_id = field_id
+    fit.weight_field_id = weight_field_id
+    fit.weight_table_id = weight_table_id
+    fit.pass_through = pass_through
+
+cdef np.float64_t FIT_get_value(FieldInterpolationTable *fit,
+                            np.float64_t *dvs):
+    cdef np.float64_t bv, dy, dd, tf
+    cdef int bin_id
+    if fit.pass_through == 1: return dvs[fit.field_id]
+    if dvs[fit.field_id] > fit.bounds[1] or dvs[fit.field_id] < fit.bounds[0]: return 0.0
+    bin_id = <int> ((dvs[fit.field_id] - fit.bounds[0]) * fit.idbin)
+    dd = dvs[fit.field_id] - (fit.bounds[0] + bin_id * fit.dbin) # x - x0
+    bv = fit.values[bin_id]
+    dy = fit.values[bin_id + 1] - bv
+    if fit.weight_field_id != -1:
+        return dvs[fit.weight_field_id] * (bv + dd*dy*fit.idbin)
+    return (bv + dd*dy*fit.idbin)
+
+cdef class TransferFunctionProxy:
+    cdef int n_fields
+    cdef int n_field_tables
+    cdef public int ns
+
+    # These are the field tables and their affiliated storage.
+    # We have one field_id for every table.  Note that a single field can
+    # correspond to multiple tables, and each field table will only have
+    # interpolate called once.
+    cdef FieldInterpolationTable field_tables[6]
+    cdef np.float64_t istorage[6]
+
+    # Here are the field tables that correspond to each of the six channels.
+    # We have three emission channels, three absorption channels.
+    cdef int field_table_ids[6]
+
+    # We store a reference to the transfer function object and to the field
+    # interpolation tables
+    cdef public object tf_obj
+    cdef public object my_field_tables
+
+    def __cinit__(self, tf_obj):
+        # We have N fields.  We have 6 channels.  We have M field tables.
+        # The idea is that we can have multiple channels corresponding to the
+        # same field table.  So, we create storage for the outputs from all the
+        # field tables.  We need to know which field value to pass in to the
+        # field table, and we need to know which table to use for each of the
+        # six channels.
+        cdef int i
+        cdef np.ndarray[np.float64_t, ndim=1] temp
+        cdef FieldInterpolationTable fit
+
+        self.tf_obj = tf_obj
+
+        self.n_field_tables = tf_obj.n_field_tables
+        for i in range(6): self.istorage[i] = 0.0
+
+        self.my_field_tables = []
+        for i in range(self.n_field_tables):
+            temp = tf_obj.tables[i].y
+            FIT_initialize_table(&self.field_tables[i],
+                      temp.shape[0],
+                      <np.float64_t *> temp.data,
+                      tf_obj.tables[i].x_bounds[0],
+                      tf_obj.tables[i].x_bounds[1],
+                      tf_obj.field_ids[i], tf_obj.weight_field_ids[i],
+                      tf_obj.weight_table_ids[i],
+                      tf_obj.tables[i].pass_through)
+            self.my_field_tables.append((tf_obj.tables[i],
+                                         tf_obj.tables[i].y))
+            self.field_tables[i].field_id = tf_obj.field_ids[i]
+            self.field_tables[i].weight_field_id = tf_obj.weight_field_ids[i]
+            print "Field table", i, "corresponds to",
+            print self.field_tables[i].field_id,
+            print "(Weighted with ", self.field_tables[i].weight_field_id,
+            print ")"
+
+        for i in range(6):
+            self.field_table_ids[i] = tf_obj.field_table_ids[i]
+            print "Channel", i, "corresponds to", self.field_table_ids[i]
+            
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    cdef void eval_transfer(self, np.float64_t dt, np.float64_t *dvs,
+                                  np.float64_t *rgba, np.float64_t *grad):
+        cdef int i, fid, use
+        cdef np.float64_t ta, tf, trgba[6], dot_prod
+        # NOTE: We now disable this.  I have left it to ease the process of
+        # potentially, one day, re-including it.
+        #use = 0
+        #for i in range(self.n_field_tables):
+        #    fid = self.field_tables[i].field_id
+        #    if (dvs[fid] >= self.field_tables[i].bounds[0]) and \
+        #       (dvs[fid] <= self.field_tables[i].bounds[1]):
+        #        use = 1
+        #        break
+        for i in range(self.n_field_tables):
+            self.istorage[i] = FIT_get_value(&self.field_tables[i], dvs)
+        # We have to do this after the interpolation
+        for i in range(self.n_field_tables):
+            fid = self.field_tables[i].weight_table_id
+            if fid != -1: self.istorage[i] *= self.istorage[fid]
+        for i in range(6):
+            trgba[i] = self.istorage[self.field_table_ids[i]]
+            #print i, trgba[i],
+        #print
+        # A few words on opacity.  We're going to be integrating equation 1.23
+        # from Rybicki & Lightman.  dI_\nu / ds = -\alpha_\nu I_\nu + j_\nu
+        # \alpha_nu = \kappa \rho , but we leave that up to the input
+        # transfer function.
+        # SOoooooOOOooo, the upshot is that we are doing a rectangular
+        # integration here:
+        #   I_{i+1} = ds * C_i + (1.0 - ds*alpha_i) * I_i
+        for i in range(3):
+            # This is the new way: alpha corresponds to opacity of a given
+            # slice.  Previously it was ill-defined, but represented some
+            # measure of emissivity.
+            ta = fmax((1.0 - dt*trgba[i+3]), 0.0)
+            rgba[i  ] = dt*trgba[i  ] + ta * rgba[i  ]
+            #rgba[i+3] = dt*trgba[i+3] + ta * rgba[i+3]
+            # This is the old way:
+            #rgba[i  ] += trgba[i] * (1.0 - rgba[i+3])*dt*trgba[i+3]
+            #rgba[i+3] += trgba[i] * (1.0 - rgba[i+3])*dt*trgba[i+3]
+
+cdef class VectorPlane:
+    cdef public object avp_pos, avp_dir, acenter, aimage
+    cdef np.float64_t *vp_pos, *vp_dir, *center, *image,
+    cdef np.float64_t pdx, pdy, bounds[4]
+    cdef int nv[2]
+    cdef int vp_strides[3]
+    cdef int im_strides[3]
+    cdef int vd_strides[3]
+    cdef public object ax_vec, ay_vec
+    cdef np.float64_t *x_vec, *y_vec
+
+    def __cinit__(self, 
+                  np.ndarray[np.float64_t, ndim=3] vp_pos,
+                  np.ndarray vp_dir,
+                  np.ndarray[np.float64_t, ndim=1] center,
+                  bounds,
+                  np.ndarray[np.float64_t, ndim=3] image,
+                  np.ndarray[np.float64_t, ndim=1] x_vec,
+                  np.ndarray[np.float64_t, ndim=1] y_vec):
+        cdef int i, j
+        self.avp_pos = vp_pos
+        self.avp_dir = vp_dir
+        self.acenter = center
+        self.aimage = image
+        self.ax_vec = x_vec
+        self.ay_vec = y_vec
+        self.vp_pos = <np.float64_t *> vp_pos.data
+        self.vp_dir = <np.float64_t *> vp_dir.data
+        self.center = <np.float64_t *> center.data
+        self.image = <np.float64_t *> image.data
+        self.x_vec = <np.float64_t *> x_vec.data
+        self.y_vec = <np.float64_t *> y_vec.data
+        self.nv[0] = vp_pos.shape[0]
+        self.nv[1] = vp_pos.shape[1]
+        for i in range(4): self.bounds[i] = bounds[i]
+        self.pdx = (self.bounds[1] - self.bounds[0])/self.nv[0]
+        self.pdy = (self.bounds[3] - self.bounds[2])/self.nv[1]
+        for i in range(3):
+            self.vp_strides[i] = vp_pos.strides[i] / 8
+            self.im_strides[i] = image.strides[i] / 8
+        if vp_dir.ndim > 1:
+            for i in range(3):
+                self.vd_strides[i] = vp_dir.strides[i] / 8
+        else:
+            self.vd_strides[0] = self.vd_strides[1] = self.vd_strides[2] = -1
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    cdef void get_start_stop(self, np.float64_t *ex, int *rv):
+        # Extrema need to be re-centered
+        cdef np.float64_t cx, cy
+        cdef int i
+        cx = cy = 0.0
+        for i in range(3):
+            cx += self.center[i] * self.x_vec[i]
+            cy += self.center[i] * self.y_vec[i]
+        rv[0] = lrint((ex[0] - cx - self.bounds[0])/self.pdx)
+        rv[1] = rv[0] + lrint((ex[1] - ex[0])/self.pdx)
+        rv[2] = lrint((ex[2] - cy - self.bounds[2])/self.pdy)
+        rv[3] = rv[2] + lrint((ex[3] - ex[2])/self.pdy)
+
+    cdef inline void copy_into(self, np.float64_t *fv, np.float64_t *tv,
+                        int i, int j, int nk, int strides[3]):
+        # We know the first two dimensions of our from-vector, and our
+        # to-vector is flat and 'ni' long
+        cdef int k
+        cdef int offset = strides[0] * i + strides[1] * j
+        for k in range(nk):
+            tv[k] = fv[offset + k]
+
+    cdef inline void copy_back(self, np.float64_t *fv, np.float64_t *tv,
+                        int i, int j, int nk, int strides[3]):
+        cdef int k
+        cdef int offset = strides[0] * i + strides[1] * j
+        for k in range(nk):
+            tv[offset + k] = fv[k]
+
+cdef class PartitionedGrid:
+    cdef public object my_data
+    cdef public object LeftEdge
+    cdef public object RightEdge
+    cdef np.float64_t *data[6]
+    cdef np.float64_t dvs[6]
+    cdef np.float64_t left_edge[3]
+    cdef np.float64_t right_edge[3]
+    cdef np.float64_t dds[3]
+    cdef np.float64_t idds[3]
+    cdef int dims[3]
+    cdef public int parent_grid_id
+    cdef public int n_fields
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    def __cinit__(self,
+                  int parent_grid_id, int n_fields, data,
+                  np.ndarray[np.float64_t, ndim=1] left_edge,
+                  np.ndarray[np.float64_t, ndim=1] right_edge,
+                  np.ndarray[np.int64_t, ndim=1] dims):
+        # The data is likely brought in via a slice, so we copy it
+        cdef int i, j, k, size
+        cdef np.ndarray[np.float64_t, ndim=3] tdata
+        self.parent_grid_id = parent_grid_id
+        self.LeftEdge = left_edge
+        self.RightEdge = right_edge
+        for i in range(3):
+            self.left_edge[i] = left_edge[i]
+            self.right_edge[i] = right_edge[i]
+            self.dims[i] = dims[i]
+            self.dds[i] = (self.right_edge[i] - self.left_edge[i])/dims[i]
+            self.idds[i] = 1.0/self.dds[i]
+        self.my_data = data
+        self.n_fields = n_fields
+        for i in range(n_fields):
+            tdata = data[i]
+            self.data[i] = <np.float64_t *> tdata.data
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    def cast_plane(self, TransferFunctionProxy tf, VectorPlane vp):
+        # This routine will iterate over all of the vectors and cast each in
+        # turn.  Might benefit from a more sophisticated intersection check,
+        # like http://courses.csusm.edu/cs697exz/ray_box.htm
+        cdef int vi, vj, hit, i, ni, nj, nn
+        cdef int iter[4]
+        cdef np.float64_t v_pos[3], v_dir[3], rgba[6], extrema[4]
+        hit = 0
+        self.calculate_extent(vp, extrema)
+        vp.get_start_stop(extrema, iter)
+        iter[0] = iclip(iter[0], 0, vp.nv[0])
+        iter[1] = iclip(iter[1], 0, vp.nv[0])
+        iter[2] = iclip(iter[2], 0, vp.nv[1])
+        iter[3] = iclip(iter[3], 0, vp.nv[1])
+        if vp.vd_strides[0] == -1:
+            for vi in range(iter[0], iter[1]):
+                for vj in range(iter[2], iter[3]):
+                    vp.copy_into(vp.vp_pos, v_pos, vi, vj, 3, vp.vp_strides)
+                    vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
+                    self.integrate_ray(v_pos, vp.vp_dir, rgba, tf)
+                    vp.copy_back(rgba, vp.image, vi, vj, 3, vp.im_strides)
+        else:
+            # If we do not have an orthographic projection, we have to cast all
+            # our rays (until we can get an extrema calculation...)
+            for vi in range(vp.nv[0]):
+                for vj in range(vp.nv[1]):
+                    vp.copy_into(vp.vp_pos, v_pos, vi, vj, 3, vp.vp_strides)
+                    vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
+                    vp.copy_into(vp.vp_dir, v_dir, vi, vj, 3, vp.vd_strides)
+                    self.integrate_ray(v_pos, v_dir, rgba, tf)
+                    vp.copy_back(rgba, vp.image, vi, vj, 3, vp.im_strides)
+        return hit
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    cdef void calculate_extent(self, VectorPlane vp,
+                               np.float64_t extrema[4]):
+        # We do this for all eight corners
+        cdef np.float64_t *edges[2], temp
+        edges[0] = self.left_edge
+        edges[1] = self.right_edge
+        extrema[0] = extrema[2] = 1e300; extrema[1] = extrema[3] = -1e300
+        cdef int i, j, k
+        for i in range(2):
+            for j in range(2):
+                for k in range(2):
+                    # This should rotate it into the vector plane
+                    temp  = edges[i][0] * vp.x_vec[0]
+                    temp += edges[j][1] * vp.x_vec[1]
+                    temp += edges[k][2] * vp.x_vec[2]
+                    if temp < extrema[0]: extrema[0] = temp
+                    if temp > extrema[1]: extrema[1] = temp
+                    temp  = edges[i][0] * vp.y_vec[0]
+                    temp += edges[j][1] * vp.y_vec[1]
+                    temp += edges[k][2] * vp.y_vec[2]
+                    if temp < extrema[2]: extrema[2] = temp
+                    if temp > extrema[3]: extrema[3] = temp
+        #print extrema[0], extrema[1], extrema[2], extrema[3]
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    cdef int integrate_ray(self, np.float64_t v_pos[3],
+                                 np.float64_t v_dir[3],
+                                 np.float64_t rgba[4],
+                                 TransferFunctionProxy tf):
+        cdef int cur_ind[3], step[3], x, y, i, n, flat_ind, hit, direction
+        cdef np.float64_t intersect_t = 1.0
+        cdef np.float64_t iv_dir[3]
+        cdef np.float64_t intersect[3], tmax[3], tdelta[3]
+        cdef np.float64_t enter_t, dist, alpha, dt, exit_t
+        cdef np.float64_t tr, tl, temp_x, temp_y, dv
+        for i in range(3):
+            if (v_dir[i] < 0):
+                step[i] = -1
+            elif (v_dir[i] == 0):
+                step[i] = 1
+                tmax[i] = 1e60
+                iv_dir[i] = 1e60
+                tdelta[i] = 1e-60
+                continue
+            else:
+                step[i] = 1
+            x = (i+1) % 3
+            y = (i+2) % 3
+            iv_dir[i] = 1.0/v_dir[i]
+            tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
+            temp_x = (v_pos[x] + tl*v_dir[x])
+            temp_y = (v_pos[y] + tl*v_dir[y])
+            if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+               self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+               0.0 <= tl and tl < intersect_t:
+                direction = i
+                intersect_t = tl
+            tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
+            temp_x = (v_pos[x] + tr*v_dir[x])
+            temp_y = (v_pos[y] + tr*v_dir[y])
+            if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+               self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+               0.0 <= tr and tr < intersect_t:
+                direction = i
+                intersect_t = tr
+        if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
+           self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
+           self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
+            intersect_t = 0.0
+        if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
+        for i in range(3):
+            intersect[i] = v_pos[i] + intersect_t * v_dir[i]
+            cur_ind[i] = <int> floor((intersect[i] +
+                                      step[i]*1e-8*self.dds[i] -
+                                      self.left_edge[i])*self.idds[i])
+            tmax[i] = (((cur_ind[i]+step[i])*self.dds[i])+
+                        self.left_edge[i]-v_pos[i])*iv_dir[i]
+            # This deals with the asymmetry in having our indices refer to the
+            # left edge of a cell, but the right edge of the brick being one
+            # extra zone out.
+            if cur_ind[i] == self.dims[i] and step[i] < 0:
+                cur_ind[i] = self.dims[i] - 1
+            if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
+            if step[i] > 0:
+                tmax[i] = (((cur_ind[i]+1)*self.dds[i])
+                            +self.left_edge[i]-v_pos[i])*iv_dir[i]
+            if step[i] < 0:
+                tmax[i] = (((cur_ind[i]+0)*self.dds[i])
+                            +self.left_edge[i]-v_pos[i])*iv_dir[i]
+            tdelta[i] = (self.dds[i]*iv_dir[i])
+            if tdelta[i] < 0: tdelta[i] *= -1
+        # We have to jumpstart our calculation
+        enter_t = intersect_t
+        while 1:
+            # dims here is one less than the dimensions of the data,
+            # but we are tracing on the grid, not on the data...
+            if (not (0 <= cur_ind[0] < self.dims[0])) or \
+               (not (0 <= cur_ind[1] < self.dims[1])) or \
+               (not (0 <= cur_ind[2] < self.dims[2])):
+                break
+            hit += 1
+            if tmax[0] < tmax[1]:
+                if tmax[0] < tmax[2]:
+                    exit_t = fmin(tmax[0], 1.0)
+                    self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+                                       rgba, tf)
+                    cur_ind[0] += step[0]
+                    enter_t = tmax[0]
+                    tmax[0] += tdelta[0]
+                else:
+                    exit_t = fmin(tmax[2], 1.0)
+                    self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+                                       rgba, tf)
+                    cur_ind[2] += step[2]
+                    enter_t = tmax[2]
+                    tmax[2] += tdelta[2]
+            else:
+                if tmax[1] < tmax[2]:
+                    exit_t = fmin(tmax[1], 1.0)
+                    self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+                                       rgba, tf)
+                    cur_ind[1] += step[1]
+                    enter_t = tmax[1]
+                    tmax[1] += tdelta[1]
+                else:
+                    exit_t = fmin(tmax[2], 1.0)
+                    self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+                                       rgba, tf)
+                    cur_ind[2] += step[2]
+                    enter_t = tmax[2]
+                    tmax[2] += tdelta[2]
+            if enter_t > 1.0: break
+        return hit
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    cdef void sample_values(self,
+                            np.float64_t v_pos[3],
+                            np.float64_t v_dir[3],
+                            np.float64_t enter_t,
+                            np.float64_t exit_t,
+                            int ci[3],
+                            np.float64_t *rgba,
+                            TransferFunctionProxy tf):
+        cdef np.float64_t cp[3], dp[3], temp, dt, t, dv
+        cdef np.float64_t grad[3], ds[3]
+        grad[0] = grad[1] = grad[2] = 0.0
+        cdef int dti, i
+        dt = (exit_t - enter_t) / tf.ns # 4 samples should be dt=0.25
+        cdef int offset = ci[0] * (self.dims[1] + 1) * (self.dims[2] + 1) \
+                        + ci[1] * (self.dims[2] + 1) + ci[2]
+        for i in range(3):
+            # temp is the left edge of the current cell
+            temp = ci[i] * self.dds[i] + self.left_edge[i]
+            # this gets us dp as the current first sample position
+            dp[i] = (enter_t + 0.5 * dt) * v_dir[i] + v_pos[i] - temp
+            dp[i] *= self.idds[i]
+            ds[i] = v_dir[i] * self.idds[i] * dt
+        for dti in range(tf.ns): 
+            for i in range(self.n_fields):
+                self.dvs[i] = offset_interpolate(self.dims, dp, self.data[i] + offset)
+            #if (dv < tf.x_bounds[0]) or (dv > tf.x_bounds[1]):
+            #    continue
+            for i in range(3):
+                dp[i] += ds[i]
+            tf.eval_transfer(dt, self.dvs, rgba, grad)
+
+cdef class GridFace:
+    cdef int direction
+    cdef public np.float64_t coord
+    cdef np.float64_t left_edge[3]
+    cdef np.float64_t right_edge[3]
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    def __init__(self, grid, int direction, int left):
+        self.direction = direction
+        if left == 1:
+            self.coord = grid.LeftEdge[direction]
+        else:
+            self.coord = grid.RightEdge[direction]
+        cdef int i
+        for i in range(3):
+            self.left_edge[i] = grid.LeftEdge[i]
+            self.right_edge[i] = grid.RightEdge[i]
+        self.left_edge[direction] = self.right_edge[direction] = self.coord
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    cdef int proj_overlap(self, np.float64_t *left_edge, np.float64_t *right_edge):
+        cdef int xax, yax
+        xax = (self.direction + 1) % 3
+        yax = (self.direction + 2) % 3
+        if left_edge[xax] >= self.right_edge[xax]: return 0
+        if right_edge[xax] <= self.left_edge[xax]: return 0
+        if left_edge[yax] >= self.right_edge[yax]: return 0
+        if right_edge[yax] <= self.left_edge[yax]: return 0
+        return 1
+
+cdef class ProtoPrism:
+    cdef np.float64_t left_edge[3]
+    cdef np.float64_t right_edge[3]
+    cdef public object LeftEdge
+    cdef public object RightEdge
+    cdef public object subgrid_faces
+    cdef public int parent_grid_id
+    def __cinit__(self, int parent_grid_id,
+                  np.ndarray[np.float64_t, ndim=1] left_edge,
+                  np.ndarray[np.float64_t, ndim=1] right_edge,
+                  subgrid_faces):
+        self.parent_grid_id = parent_grid_id
+        cdef int i
+        self.LeftEdge = left_edge
+        self.RightEdge = right_edge
+        for i in range(3):
+            self.left_edge[i] = left_edge[i]
+            self.right_edge[i] = right_edge[i]
+        self.subgrid_faces = subgrid_faces
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    def sweep(self, int direction = 0, int stack = 0):
+        cdef int i
+        cdef GridFace face
+        cdef np.float64_t proto_split[3]
+        for i in range(3): proto_split[i] = self.right_edge[i]
+        for face in self.subgrid_faces[direction]:
+            proto_split[direction] = face.coord
+            if proto_split[direction] <= self.left_edge[direction]:
+                continue
+            if proto_split[direction] == self.right_edge[direction]:
+                if stack == 2: return [self]
+                return self.sweep((direction + 1) % 3, stack + 1)
+            if face.proj_overlap(self.left_edge, proto_split) == 1:
+                left, right = self.split(proto_split, direction)
+                LC = left.sweep((direction + 1) % 3)
+                RC = right.sweep(direction)
+                return LC + RC
+        raise RuntimeError
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    cdef object split(self, np.float64_t *sp, int direction):
+        cdef int i
+        cdef np.ndarray split_left = self.LeftEdge.copy()
+        cdef np.ndarray split_right = self.RightEdge.copy()
+
+        for i in range(3): split_left[i] = self.right_edge[i]
+        split_left[direction] = sp[direction]
+        left = ProtoPrism(self.parent_grid_id, self.LeftEdge, split_left,
+                          self.subgrid_faces)
+
+        for i in range(3): split_right[i] = self.left_edge[i]
+        split_right[direction] = sp[direction]
+        right = ProtoPrism(self.parent_grid_id, split_right, self.RightEdge,
+                           self.subgrid_faces)
+
+        return (left, right)
+
+    @cython.boundscheck(False)
+    @cython.wraparound(False)
+    def get_brick(self, np.ndarray[np.float64_t, ndim=1] grid_left_edge,
+                        np.ndarray[np.float64_t, ndim=1] grid_dds,
+                        child_mask):
+        # We get passed in the left edge, the dds (which gives dimensions) and
+        # the data, which is already vertex-centered.
+        cdef PartitionedGrid PG
+        cdef int li[3], ri[3], idims[3], i
+        for i in range(3):
+            li[i] = lrint((self.left_edge[i] - grid_left_edge[i])/grid_dds[i])
+            ri[i] = lrint((self.right_edge[i] - grid_left_edge[i])/grid_dds[i])
+            idims[i] = ri[i] - li[i]
+        if child_mask[li[0], li[1], li[2]] == 0: return []
+        cdef np.ndarray[np.int64_t, ndim=1] dims = np.empty(3, dtype='int64')
+        for i in range(3):
+            dims[i] = idims[i]
+        #cdef np.ndarray[np.float64_t, ndim=3] new_data
+        #new_data = data[li[0]:ri[0]+1,li[1]:ri[1]+1,li[2]:ri[2]+1].copy()
+        #PG = PartitionedGrid(self.parent_grid_id, new_data,
+        #                     self.LeftEdge, self.RightEdge, dims)
+        return ((li[0], ri[0]), (li[1], ri[1]), (li[2], ri[2]), dims)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/fortran_reader.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/fortran_reader.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,70 @@
+"""
+Simple readers for fortran unformatted data, specifically for the Tiger code.
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: UCSD
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import numpy as np
+cimport numpy as np
+cimport cython
+
+from stdio cimport fopen, fclose, FILE
+
+cdef extern from "stdio.h":
+    cdef int SEEK_SET
+    cdef int SEEK_CUR
+    cdef int SEEK_END
+    int fseek(FILE *stream, long offset, int whence)
+    size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
+    long ftell(FILE *stream)
+
+@cython.boundscheck(False)
+@cython.wraparound(False)
+def read_tiger_section(
+                     char *fn,
+                     np.ndarray[np.int64_t, ndim=1] slab_start,
+                     np.ndarray[np.int64_t, ndim=1] slab_size,
+                     np.ndarray[np.int64_t, ndim=1] root_size,
+                     int offset = 36):
+    cdef int strides[3]
+    strides[0] = 1
+    strides[1] = root_size[0] * strides[0]
+    strides[2] = strides[1] * root_size[1] + 2
+    cdef np.int64_t i, j, k
+    cdef np.ndarray buffer = np.zeros(slab_size, dtype='float32', order='F')
+    cdef FILE *f = fopen(fn, "rb")
+    #for i in range(3): offset += strides[i] * slab_start[i]
+    cdef np.int64_t pos = 0
+    cdef np.int64_t moff = 0
+    cdef float *data = <float *> buffer.data
+    fseek(f, offset, 0)
+    # If anybody wants to convert this loop to a SEEK_CUR, that'd be great.
+    for i in range(slab_size[2]):
+        for j in range(slab_size[1]):
+            moff = (slab_start[0]    ) * strides[0] \
+                 + (slab_start[1] + j) * strides[1] \
+                 + (slab_start[2] + i) * strides[2]
+            #print offset + 4 * moff, pos
+            fseek(f, offset + 4 * moff, SEEK_SET)
+            fread(<void *> (data + pos), 4, slab_size[0], f)
+            pos += slab_size[0]
+    return buffer
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/_amr_utils/png_writer.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/_amr_utils/png_writer.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,170 @@
+"""
+A light interface to libpng
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: UCSD
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import numpy as np
+cimport numpy as np
+cimport cython
+
+from stdio cimport fopen, fclose, FILE
+
+cdef extern from "stdlib.h":
+    # NOTE that size_t might not be int
+    void *alloca(int)
+
+cdef extern from "png.h":
+    ctypedef unsigned long png_uint_32
+    ctypedef long png_int_32
+    ctypedef unsigned short png_uint_16
+    ctypedef short png_int_16
+    ctypedef unsigned char png_byte
+    ctypedef void            *png_voidp
+    ctypedef png_byte        *png_bytep
+    ctypedef png_uint_32     *png_uint_32p
+    ctypedef png_int_32      *png_int_32p
+    ctypedef png_uint_16     *png_uint_16p
+    ctypedef png_int_16      *png_int_16p
+    ctypedef char            *png_charp
+    ctypedef char            *png_const_charp
+    ctypedef FILE            *png_FILE_p
+
+    ctypedef struct png_struct:
+        pass
+    ctypedef png_struct      *png_structp
+
+    ctypedef struct png_info:
+        pass
+    ctypedef png_info        *png_infop
+
+    ctypedef struct png_color_8:
+        png_byte red
+        png_byte green
+        png_byte blue
+        png_byte gray
+        png_byte alpha
+    ctypedef png_color_8 *png_color_8p
+
+    cdef png_const_charp PNG_LIBPNG_VER_STRING
+
+    # Note that we don't support error or warning functions
+    png_structp png_create_write_struct(
+        png_const_charp user_png_ver, png_voidp error_ptr,
+        void *error_fn, void *warn_fn)
+    
+    png_infop png_create_info_struct(png_structp png_ptr)
+
+    void png_init_io(png_structp png_ptr, png_FILE_p fp)
+
+    void png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
+        png_uint_32 width, png_uint_32 height, int bit_depth,
+        int color_type, int interlace_method, int compression_method,
+        int filter_method)
+
+    cdef int PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE
+    cdef int PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE
+
+    void png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
+        png_uint_32 res_x, png_uint_32 res_y, int unit_type)
+
+    cdef int PNG_RESOLUTION_METER
+
+    void png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
+        png_color_8p sig_bit)
+
+    void png_write_info(png_structp png_ptr, png_infop info_ptr)
+    void png_write_image(png_structp png_ptr, png_bytep *image)
+    void png_write_end(png_structp png_ptr, png_infop info_ptr)
+
+    void png_destroy_write_struct(
+        png_structp *png_ptr_ptr, png_infop *info_ptr_ptr)
+
+def write_png(np.ndarray[np.uint8_t, ndim=3] buffer,
+              char *filename, int dpi=100):
+
+    # This is something of a translation of the matplotlib _png module
+    cdef png_byte *pix_buffer = <png_byte *> buffer.data
+    cdef int width = buffer.shape[1]
+    cdef int height = buffer.shape[0]
+
+    cdef FILE* fileobj = fopen(filename, "wb")
+    cdef png_bytep *row_pointers
+    cdef png_structp png_ptr
+    cdef png_infop info_ptr
+
+    cdef png_color_8 sig_bit
+    cdef png_uint_32 row
+
+    row_pointers = <png_bytep *> alloca(sizeof(png_bytep) * height)
+
+    for row in range(height):
+        row_pointers[row] = pix_buffer + row * width * 4
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL)
+    info_ptr = png_create_info_struct(png_ptr)
+    
+    # Um we are ignoring setjmp sorry guys
+
+    png_init_io(png_ptr, fileobj)
+
+    png_set_IHDR(png_ptr, info_ptr, width, height, 8,
+                 PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
+                 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE)
+
+    cdef size_t dots_per_meter = <size_t> (dpi / (2.54 / 100.0))
+    png_set_pHYs(png_ptr, info_ptr, dots_per_meter, dots_per_meter,
+                 PNG_RESOLUTION_METER)
+
+    sig_bit.gray = 0
+    sig_bit.red = sig_bit.green = sig_bit.blue = sig_bit.alpha = 8
+
+    png_set_sBIT(png_ptr, info_ptr, &sig_bit)
+
+    png_write_info(png_ptr, info_ptr)
+    png_write_image(png_ptr, row_pointers)
+    png_write_end(png_ptr, info_ptr)
+
+    fclose(fileobj)
+    png_destroy_write_struct(&png_ptr, &info_ptr)
+
+def add_points_to_image(
+        np.ndarray[np.uint8_t, ndim=3] buffer,
+        np.ndarray[np.float64_t, ndim=1] px,
+        np.ndarray[np.float64_t, ndim=1] py,
+        np.float64_t pv):
+    cdef int i, j, k, pi
+    cdef int np = px.shape[0]
+    cdef int xs = buffer.shape[0]
+    cdef int ys = buffer.shape[1]
+    cdef int v 
+    v = iclip(<int>(pv * 255), 0, 255)
+    for pi in range(np):
+        j = <int> (xs * px[pi])
+        i = <int> (ys * py[pi])
+        for k in range(3):
+            buffer[i, j, k] = 0
+    return
+    for i in range(xs):
+        for j in range(ys):
+            for k in range(3):
+                v = buffer[i, j, k]
+                buffer[i, j, k] = iclip(v, 0, 255)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/amr_utils.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/amr_utils.c	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,32107 @@
+/* Generated by Cython 0.13.beta0 on Mon Aug  2 07:18:26 2010 */
+
+#define PY_SSIZE_T_CLEAN
+#include "Python.h"
+#ifndef Py_PYTHON_H
+    #error Python headers needed to compile C extensions, please install development version of Python.
+#else
+
+#include <stddef.h> /* For offsetof */
+#ifndef offsetof
+#define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
+#endif
+
+#if !defined(WIN32) && !defined(MS_WINDOWS)
+  #ifndef __stdcall
+    #define __stdcall
+  #endif
+  #ifndef __cdecl
+    #define __cdecl
+  #endif
+  #ifndef __fastcall
+    #define __fastcall
+  #endif
+#endif
+
+#ifndef DL_IMPORT
+  #define DL_IMPORT(t) t
+#endif
+#ifndef DL_EXPORT
+  #define DL_EXPORT(t) t
+#endif
+
+#ifndef PY_LONG_LONG
+  #define PY_LONG_LONG LONG_LONG
+#endif
+
+#if PY_VERSION_HEX < 0x02040000
+  #define METH_COEXIST 0
+  #define PyDict_CheckExact(op) (Py_TYPE(op) == &PyDict_Type)
+  #define PyDict_Contains(d,o)   PySequence_Contains(d,o)
+#endif
+
+#if PY_VERSION_HEX < 0x02050000
+  typedef int Py_ssize_t;
+  #define PY_SSIZE_T_MAX INT_MAX
+  #define PY_SSIZE_T_MIN INT_MIN
+  #define PY_FORMAT_SIZE_T ""
+  #define PyInt_FromSsize_t(z) PyInt_FromLong(z)
+  #define PyInt_AsSsize_t(o)   PyInt_AsLong(o)
+  #define PyNumber_Index(o)    PyNumber_Int(o)
+  #define PyIndex_Check(o)     PyNumber_Check(o)
+  #define PyErr_WarnEx(category, message, stacklevel) PyErr_Warn(category, message)
+#endif
+
+#if PY_VERSION_HEX < 0x02060000
+  #define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
+  #define Py_TYPE(ob)   (((PyObject*)(ob))->ob_type)
+  #define Py_SIZE(ob)   (((PyVarObject*)(ob))->ob_size)
+  #define PyVarObject_HEAD_INIT(type, size) \
+          PyObject_HEAD_INIT(type) size,
+  #define PyType_Modified(t)
+
+  typedef struct {
+     void *buf;
+     PyObject *obj;
+     Py_ssize_t len;
+     Py_ssize_t itemsize;
+     int readonly;
+     int ndim;
+     char *format;
+     Py_ssize_t *shape;
+     Py_ssize_t *strides;
+     Py_ssize_t *suboffsets;
+     void *internal;
+  } Py_buffer;
+
+  #define PyBUF_SIMPLE 0
+  #define PyBUF_WRITABLE 0x0001
+  #define PyBUF_FORMAT 0x0004
+  #define PyBUF_ND 0x0008
+  #define PyBUF_STRIDES (0x0010 | PyBUF_ND)
+  #define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
+  #define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
+  #define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
+  #define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
+
+#endif
+
+#if PY_MAJOR_VERSION < 3
+  #define __Pyx_BUILTIN_MODULE_NAME "__builtin__"
+#else
+  #define __Pyx_BUILTIN_MODULE_NAME "builtins"
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define Py_TPFLAGS_CHECKTYPES 0
+  #define Py_TPFLAGS_HAVE_INDEX 0
+#endif
+
+#if (PY_VERSION_HEX < 0x02060000) || (PY_MAJOR_VERSION >= 3)
+  #define Py_TPFLAGS_HAVE_NEWBUFFER 0
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define PyBaseString_Type            PyUnicode_Type
+  #define PyStringObject               PyUnicodeObject
+  #define PyString_Type                PyUnicode_Type
+  #define PyString_Check               PyUnicode_Check
+  #define PyString_CheckExact          PyUnicode_CheckExact
+#endif
+
+#if PY_VERSION_HEX < 0x02060000
+  #define PyBytesObject                PyStringObject
+  #define PyBytes_Type                 PyString_Type
+  #define PyBytes_Check                PyString_Check
+  #define PyBytes_CheckExact           PyString_CheckExact
+  #define PyBytes_FromString           PyString_FromString
+  #define PyBytes_FromStringAndSize    PyString_FromStringAndSize
+  #define PyBytes_FromFormat           PyString_FromFormat
+  #define PyBytes_DecodeEscape         PyString_DecodeEscape
+  #define PyBytes_AsString             PyString_AsString
+  #define PyBytes_AsStringAndSize      PyString_AsStringAndSize
+  #define PyBytes_Size                 PyString_Size
+  #define PyBytes_AS_STRING            PyString_AS_STRING
+  #define PyBytes_GET_SIZE             PyString_GET_SIZE
+  #define PyBytes_Repr                 PyString_Repr
+  #define PyBytes_Concat               PyString_Concat
+  #define PyBytes_ConcatAndDel         PyString_ConcatAndDel
+  #define PySet_Check(obj)             PyObject_TypeCheck(obj, &PySet_Type)
+  #define PyFrozenSet_Check(obj)       PyObject_TypeCheck(obj, &PyFrozenSet_Type)
+#endif
+
+#ifndef PySet_CheckExact
+#  define PySet_CheckExact(obj)          (Py_TYPE(obj) == &PySet_Type)
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define PyInt_Type                   PyLong_Type
+  #define PyInt_Check(op)              PyLong_Check(op)
+  #define PyInt_CheckExact(op)         PyLong_CheckExact(op)
+  #define PyInt_FromString             PyLong_FromString
+  #define PyInt_FromUnicode            PyLong_FromUnicode
+  #define PyInt_FromLong               PyLong_FromLong
+  #define PyInt_FromSize_t             PyLong_FromSize_t
+  #define PyInt_FromSsize_t            PyLong_FromSsize_t
+  #define PyInt_AsLong                 PyLong_AsLong
+  #define PyInt_AS_LONG                PyLong_AS_LONG
+  #define PyInt_AsSsize_t              PyLong_AsSsize_t
+  #define PyInt_AsUnsignedLongMask     PyLong_AsUnsignedLongMask
+  #define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_TrueDivide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceTrueDivide(x,y)
+#else
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_Divide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceDivide(x,y)
+#endif
+
+#if PY_MAJOR_VERSION >= 3
+  #define PyMethod_New(func, self, klass) ((self) ? PyMethod_New(func, self) : PyInstanceMethod_New(func))
+#endif
+
+#if PY_VERSION_HEX < 0x02050000
+  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),((char *)(n)))
+  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),((char *)(n)),(a))
+  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),((char *)(n)))
+#else
+  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),(n))
+  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),(n),(a))
+  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),(n))
+#endif
+
+#if PY_VERSION_HEX < 0x02050000
+  #define __Pyx_NAMESTR(n) ((char *)(n))
+  #define __Pyx_DOCSTR(n)  ((char *)(n))
+#else
+  #define __Pyx_NAMESTR(n) (n)
+  #define __Pyx_DOCSTR(n)  (n)
+#endif
+
+#ifdef __cplusplus
+#define __PYX_EXTERN_C extern "C"
+#else
+#define __PYX_EXTERN_C extern
+#endif
+
+#if defined(WIN32) || defined(MS_WINDOWS)
+#define _USE_MATH_DEFINES
+#endif
+#include <math.h>
+#define __PYX_HAVE_API__yt__amr_utils
+#include "stdio.h"
+#include "stdlib.h"
+#include "numpy/arrayobject.h"
+#include "numpy/ufuncobject.h"
+#include "math.h"
+#include "FixedInterpolator.h"
+#include "png.h"
+
+/* inline attribute */
+#ifndef CYTHON_INLINE
+  #if defined(__GNUC__)
+    #define CYTHON_INLINE __inline__
+  #elif defined(_MSC_VER)
+    #define CYTHON_INLINE __inline
+  #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+    #define CYTHON_INLINE inline
+  #else
+    #define CYTHON_INLINE 
+  #endif
+#endif
+
+/* unused attribute */
+#ifndef CYTHON_UNUSED
+# if defined(__GNUC__)
+#   if !(defined(__cplusplus)) || (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+#     define CYTHON_UNUSED __attribute__ ((__unused__)) 
+#   else
+#     define CYTHON_UNUSED
+#   endif
+# elif defined(__ICC) || defined(__INTEL_COMPILER)
+#   define CYTHON_UNUSED __attribute__ ((__unused__)) 
+# else
+#   define CYTHON_UNUSED 
+# endif
+#endif
+
+typedef struct {PyObject **p; char *s; const long n; const char* encoding; const char is_unicode; const char is_str; const char intern; } __Pyx_StringTabEntry; /*proto*/
+
+
+/* Type Conversion Predeclarations */
+
+#define __Pyx_PyBytes_FromUString(s) PyBytes_FromString((char*)s)
+#define __Pyx_PyBytes_AsUString(s)   ((unsigned char*) PyBytes_AsString(s))
+
+#define __Pyx_PyBool_FromLong(b) ((b) ? (Py_INCREF(Py_True), Py_True) : (Py_INCREF(Py_False), Py_False))
+static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject*);
+static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x);
+
+static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject*);
+static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t);
+static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject*);
+
+#define __pyx_PyFloat_AsDouble(x) (PyFloat_CheckExact(x) ? PyFloat_AS_DOUBLE(x) : PyFloat_AsDouble(x))
+
+
+#ifdef __GNUC__
+/* Test for GCC > 2.95 */
+#if __GNUC__ > 2 || (__GNUC__ == 2 && (__GNUC_MINOR__ > 95)) 
+#define likely(x)   __builtin_expect(!!(x), 1)
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#else /* __GNUC__ > 2 ... */
+#define likely(x)   (x)
+#define unlikely(x) (x)
+#endif /* __GNUC__ > 2 ... */
+#else /* __GNUC__ */
+#define likely(x)   (x)
+#define unlikely(x) (x)
+#endif /* __GNUC__ */
+    
+static PyObject *__pyx_m;
+static PyObject *__pyx_b;
+static PyObject *__pyx_empty_tuple;
+static PyObject *__pyx_empty_bytes;
+static int __pyx_lineno;
+static int __pyx_clineno = 0;
+static const char * __pyx_cfilenm= __FILE__;
+static const char *__pyx_filename;
+
+
+#if !defined(CYTHON_CCOMPLEX)
+  #if defined(__cplusplus)
+    #define CYTHON_CCOMPLEX 1
+  #elif defined(_Complex_I)
+    #define CYTHON_CCOMPLEX 1
+  #else
+    #define CYTHON_CCOMPLEX 0
+  #endif
+#endif
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    #include <complex>
+  #else
+    #include <complex.h>
+  #endif
+#endif
+
+#if CYTHON_CCOMPLEX && !defined(__cplusplus) && defined(__sun__) && defined(__GNUC__)
+  #undef _Complex_I
+  #define _Complex_I 1.0fj
+#endif
+
+static const char *__pyx_f[] = {
+  "DepthFirstOctree.pyx",
+  "PointsInVolume.pyx",
+  "VolumeIntegrator.pyx",
+  "Interpolators.pyx",
+  "RayIntegrators.pyx",
+  "CICDeposit.pyx",
+  "ContourFinding.pyx",
+  "png_writer.pyx",
+  "fortran_reader.pyx",
+  "QuadTree.pyx",
+  "numpy.pxd",
+  "amr_utils.pyx",
+};
+
+typedef npy_int8 __pyx_t_5numpy_int8_t;
+
+typedef npy_int16 __pyx_t_5numpy_int16_t;
+
+typedef npy_int32 __pyx_t_5numpy_int32_t;
+
+typedef npy_int64 __pyx_t_5numpy_int64_t;
+
+typedef npy_uint8 __pyx_t_5numpy_uint8_t;
+
+typedef npy_uint16 __pyx_t_5numpy_uint16_t;
+
+typedef npy_uint32 __pyx_t_5numpy_uint32_t;
+
+typedef npy_uint64 __pyx_t_5numpy_uint64_t;
+
+typedef npy_float32 __pyx_t_5numpy_float32_t;
+
+typedef npy_float64 __pyx_t_5numpy_float64_t;
+
+typedef npy_long __pyx_t_5numpy_int_t;
+
+typedef npy_longlong __pyx_t_5numpy_long_t;
+
+typedef npy_intp __pyx_t_5numpy_intp_t;
+
+typedef npy_uintp __pyx_t_5numpy_uintp_t;
+
+typedef npy_ulong __pyx_t_5numpy_uint_t;
+
+typedef npy_ulonglong __pyx_t_5numpy_ulong_t;
+
+typedef npy_double __pyx_t_5numpy_float_t;
+
+typedef npy_double __pyx_t_5numpy_double_t;
+
+typedef npy_longdouble __pyx_t_5numpy_longdouble_t;
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    typedef ::std::complex< float > __pyx_t_float_complex;
+  #else
+    typedef float _Complex __pyx_t_float_complex;
+  #endif
+#else
+    typedef struct { float real, imag; } __pyx_t_float_complex;
+#endif
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    typedef ::std::complex< double > __pyx_t_double_complex;
+  #else
+    typedef double _Complex __pyx_t_double_complex;
+  #endif
+#else
+    typedef struct { double real, imag; } __pyx_t_double_complex;
+#endif
+
+/* Type declarations */
+
+typedef npy_cfloat __pyx_t_5numpy_cfloat_t;
+
+typedef npy_cdouble __pyx_t_5numpy_cdouble_t;
+
+typedef npy_clongdouble __pyx_t_5numpy_clongdouble_t;
+
+typedef npy_cdouble __pyx_t_5numpy_complex_t;
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":76
+ * cdef class VectorPlane
+ * 
+ * cdef struct FieldInterpolationTable:             # <<<<<<<<<<<<<<
+ *     # Note that we make an assumption about retaining a reference to values
+ *     # externally.
+ */
+
+struct __pyx_t_2yt_9amr_utils_FieldInterpolationTable {
+  __pyx_t_5numpy_float64_t *values;
+  __pyx_t_5numpy_float64_t bounds[2];
+  __pyx_t_5numpy_float64_t dbin;
+  __pyx_t_5numpy_float64_t idbin;
+  int field_id;
+  int weight_field_id;
+  int weight_table_id;
+  int nbins;
+  int pass_through;
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":89
+ *     int pass_through
+ * 
+ * cdef void FIT_initialize_table(FieldInterpolationTable *fit, int nbins,             # <<<<<<<<<<<<<<
+ *               np.float64_t *values, np.float64_t bounds1, np.float64_t bounds2,
+ *               int field_id, int weight_field_id = -1, int weight_table_id = -1,
+ */
+
+struct __pyx_opt_args_2yt_9amr_utils_FIT_initialize_table {
+  int __pyx_n;
+  int weight_field_id;
+  int weight_table_id;
+  int pass_through;
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/QuadTree.pyx":39
+ *     void *alloca(int)
+ * 
+ * cdef struct QuadTreeNode:             # <<<<<<<<<<<<<<
+ *     np.float64_t *val
+ *     np.float64_t weight_val
+ */
+
+struct __pyx_t_2yt_9amr_utils_QuadTreeNode {
+  __pyx_t_5numpy_float64_t *val;
+  __pyx_t_5numpy_float64_t weight_val;
+  __pyx_t_5numpy_int64_t pos[2];
+  int level;
+  int nvals;
+  struct __pyx_t_2yt_9amr_utils_QuadTreeNode *children[2][2];
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":118
+ *     return (bv + dd*dy*fit.idbin)
+ * 
+ * cdef class TransferFunctionProxy:             # <<<<<<<<<<<<<<
+ *     cdef int n_fields
+ *     cdef int n_field_tables
+ */
+
+struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_2yt_9amr_utils_TransferFunctionProxy *__pyx_vtab;
+  int n_fields;
+  int n_field_tables;
+  int ns;
+  struct __pyx_t_2yt_9amr_utils_FieldInterpolationTable field_tables[6];
+  __pyx_t_5numpy_float64_t istorage[6];
+  int field_table_ids[6];
+  PyObject *tf_obj;
+  PyObject *my_field_tables;
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/DepthFirstOctree.pyx":36
+ *         self.refined_pos = 0
+ * 
+ * cdef class OctreeGrid:             # <<<<<<<<<<<<<<
+ *     cdef public object child_indices, fields, left_edges, dimensions, dx
+ *     cdef public int level
+ */
+
+struct __pyx_obj_2yt_9amr_utils_OctreeGrid {
+  PyObject_HEAD
+  PyObject *child_indices;
+  PyObject *fields;
+  PyObject *left_edges;
+  PyObject *dimensions;
+  PyObject *dx;
+  int level;
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/DepthFirstOctree.pyx":53
+ *         self.level = level
+ * 
+ * cdef class OctreeGridList:             # <<<<<<<<<<<<<<
+ *     cdef public object grids
+ *     def __cinit__(self, grids):
+ */
+
+struct __pyx_obj_2yt_9amr_utils_OctreeGridList {
+  PyObject_HEAD
+  PyObject *grids;
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":575
+ *         return 1
+ * 
+ * cdef class ProtoPrism:             # <<<<<<<<<<<<<<
+ *     cdef np.float64_t left_edge[3]
+ *     cdef np.float64_t right_edge[3]
+ */
+
+struct __pyx_obj_2yt_9amr_utils_ProtoPrism {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_2yt_9amr_utils_ProtoPrism *__pyx_vtab;
+  __pyx_t_5numpy_float64_t left_edge[3];
+  __pyx_t_5numpy_float64_t right_edge[3];
+  PyObject *LeftEdge;
+  PyObject *RightEdge;
+  PyObject *subgrid_faces;
+  int parent_grid_id;
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/DepthFirstOctree.pyx":30
+ * cimport cython
+ * 
+ * cdef class position:             # <<<<<<<<<<<<<<
+ *     cdef public int output_pos, refined_pos
+ *     def __cinit__(self):
+ */
+
+struct __pyx_obj_2yt_9amr_utils_position {
+  PyObject_HEAD
+  int output_pos;
+  int refined_pos;
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":543
+ *             tf.eval_transfer(dt, self.dvs, rgba, grad)
+ * 
+ * cdef class GridFace:             # <<<<<<<<<<<<<<
+ *     cdef int direction
+ *     cdef public np.float64_t coord
+ */
+
+struct __pyx_obj_2yt_9amr_utils_GridFace {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_2yt_9amr_utils_GridFace *__pyx_vtab;
+  int direction;
+  __pyx_t_5numpy_float64_t coord;
+  __pyx_t_5numpy_float64_t left_edge[3];
+  __pyx_t_5numpy_float64_t right_edge[3];
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/QuadTree.pyx":99
+ *     free(node)
+ * 
+ * cdef class QuadTree:             # <<<<<<<<<<<<<<
+ *     cdef int nvals
+ *     cdef np.int64_t po2[80]
+ */
+
+struct __pyx_obj_2yt_9amr_utils_QuadTree {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_2yt_9amr_utils_QuadTree *__pyx_vtab;
+  int nvals;
+  __pyx_t_5numpy_int64_t po2[80];
+  struct __pyx_t_2yt_9amr_utils_QuadTreeNode ***root_nodes;
+  __pyx_t_5numpy_int64_t top_grid_dims[2];
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":74
+ *                                        np.float64_t *data, np.float64_t *grad)
+ * 
+ * cdef class VectorPlane             # <<<<<<<<<<<<<<
+ * 
+ * cdef struct FieldInterpolationTable:
+ */
+
+struct __pyx_obj_2yt_9amr_utils_VectorPlane {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_2yt_9amr_utils_VectorPlane *__pyx_vtab;
+  PyObject *avp_pos;
+  PyObject *avp_dir;
+  PyObject *acenter;
+  PyObject *aimage;
+  __pyx_t_5numpy_float64_t *vp_pos;
+  __pyx_t_5numpy_float64_t *vp_dir;
+  __pyx_t_5numpy_float64_t *center;
+  __pyx_t_5numpy_float64_t *image;
+  __pyx_t_5numpy_float64_t pdx;
+  __pyx_t_5numpy_float64_t pdy;
+  __pyx_t_5numpy_float64_t bounds[4];
+  int nv[2];
+  int vp_strides[3];
+  int im_strides[3];
+  int vd_strides[3];
+  PyObject *ax_vec;
+  PyObject *ay_vec;
+  __pyx_t_5numpy_float64_t *x_vec;
+  __pyx_t_5numpy_float64_t *y_vec;
+};
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":299
+ *             tv[offset + k] = fv[k]
+ * 
+ * cdef class PartitionedGrid:             # <<<<<<<<<<<<<<
+ *     cdef public object my_data
+ *     cdef public object LeftEdge
+ */
+
+struct __pyx_obj_2yt_9amr_utils_PartitionedGrid {
+  PyObject_HEAD
+  struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *__pyx_vtab;
+  PyObject *my_data;
+  PyObject *LeftEdge;
+  PyObject *RightEdge;
+  __pyx_t_5numpy_float64_t *data[6];
+  __pyx_t_5numpy_float64_t dvs[6];
+  __pyx_t_5numpy_float64_t left_edge[3];
+  __pyx_t_5numpy_float64_t right_edge[3];
+  __pyx_t_5numpy_float64_t dds[3];
+  __pyx_t_5numpy_float64_t idds[3];
+  int dims[3];
+  int parent_grid_id;
+  int n_fields;
+};
+
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":543
+ *             tf.eval_transfer(dt, self.dvs, rgba, grad)
+ * 
+ * cdef class GridFace:             # <<<<<<<<<<<<<<
+ *     cdef int direction
+ *     cdef public np.float64_t coord
+ */
+
+struct __pyx_vtabstruct_2yt_9amr_utils_GridFace {
+  int (*proj_overlap)(struct __pyx_obj_2yt_9amr_utils_GridFace *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *);
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_GridFace *__pyx_vtabptr_2yt_9amr_utils_GridFace;
+
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":118
+ *     return (bv + dd*dy*fit.idbin)
+ * 
+ * cdef class TransferFunctionProxy:             # <<<<<<<<<<<<<<
+ *     cdef int n_fields
+ *     cdef int n_field_tables
+ */
+
+struct __pyx_vtabstruct_2yt_9amr_utils_TransferFunctionProxy {
+  void (*eval_transfer)(struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *);
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_TransferFunctionProxy *__pyx_vtabptr_2yt_9amr_utils_TransferFunctionProxy;
+
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":575
+ *         return 1
+ * 
+ * cdef class ProtoPrism:             # <<<<<<<<<<<<<<
+ *     cdef np.float64_t left_edge[3]
+ *     cdef np.float64_t right_edge[3]
+ */
+
+struct __pyx_vtabstruct_2yt_9amr_utils_ProtoPrism {
+  PyObject *(*split)(struct __pyx_obj_2yt_9amr_utils_ProtoPrism *, __pyx_t_5numpy_float64_t *, int);
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_ProtoPrism *__pyx_vtabptr_2yt_9amr_utils_ProtoPrism;
+
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/QuadTree.pyx":99
+ *     free(node)
+ * 
+ * cdef class QuadTree:             # <<<<<<<<<<<<<<
+ *     cdef int nvals
+ *     cdef np.int64_t po2[80]
+ */
+
+struct __pyx_vtabstruct_2yt_9amr_utils_QuadTree {
+  void (*add_to_position)(struct __pyx_obj_2yt_9amr_utils_QuadTree *, int, __pyx_t_5numpy_int64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t);
+  struct __pyx_t_2yt_9amr_utils_QuadTreeNode *(*find_on_root_level)(struct __pyx_obj_2yt_9amr_utils_QuadTree *, __pyx_t_5numpy_int64_t *, int);
+  int (*count_at_level)(struct __pyx_obj_2yt_9amr_utils_QuadTree *, struct __pyx_t_2yt_9amr_utils_QuadTreeNode *, int);
+  int (*fill_from_level)(struct __pyx_obj_2yt_9amr_utils_QuadTree *, struct __pyx_t_2yt_9amr_utils_QuadTreeNode *, int, __pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *);
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_QuadTree *__pyx_vtabptr_2yt_9amr_utils_QuadTree;
+
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":222
+ *             #rgba[i+3] += trgba[i] * (1.0 - rgba[i+3])*dt*trgba[i+3]
+ * 
+ * cdef class VectorPlane:             # <<<<<<<<<<<<<<
+ *     cdef public object avp_pos, avp_dir, acenter, aimage
+ *     cdef np.float64_t *vp_pos, *vp_dir, *center, *image,
+ */
+
+struct __pyx_vtabstruct_2yt_9amr_utils_VectorPlane {
+  void (*get_start_stop)(struct __pyx_obj_2yt_9amr_utils_VectorPlane *, __pyx_t_5numpy_float64_t *, int *);
+  void (*copy_into)(struct __pyx_obj_2yt_9amr_utils_VectorPlane *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, int, int, int, int *);
+  void (*copy_back)(struct __pyx_obj_2yt_9amr_utils_VectorPlane *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, int, int, int, int *);
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_VectorPlane *__pyx_vtabptr_2yt_9amr_utils_VectorPlane;
+
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":299
+ *             tv[offset + k] = fv[k]
+ * 
+ * cdef class PartitionedGrid:             # <<<<<<<<<<<<<<
+ *     cdef public object my_data
+ *     cdef public object LeftEdge
+ */
+
+struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid {
+  void (*calculate_extent)(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *, struct __pyx_obj_2yt_9amr_utils_VectorPlane *, __pyx_t_5numpy_float64_t *);
+  int (*integrate_ray)(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *);
+  void (*sample_values)(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, int *, __pyx_t_5numpy_float64_t *, struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *);
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *__pyx_vtabptr_2yt_9amr_utils_PartitionedGrid;
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+#ifndef CYTHON_REFNANNY
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+  #define __Pyx_GIVEREF(r)
+  #define __Pyx_XDECREF(r) Py_XDECREF(r)
+#endif /* CYTHON_REFNANNY */
+#define __Pyx_XGIVEREF(r) do { if((r) != NULL) {__Pyx_GIVEREF(r);} } while(0)
+#define __Pyx_XGOTREF(r) do { if((r) != NULL) {__Pyx_GOTREF(r);} } while(0)
+
+static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name); /*proto*/
+
+static void __Pyx_RaiseArgtupleInvalid(const char* func_name, int exact,
+    Py_ssize_t num_min, Py_ssize_t num_max, Py_ssize_t num_found); /*proto*/
+
+static CYTHON_INLINE int __Pyx_CheckKeywordStrings(PyObject *kwdict,
+    const char* function_name, int kw_allowed); /*proto*/
+
+static void __Pyx_RaiseDoubleKeywordsError(
+    const char* func_name, PyObject* kw_name); /*proto*/
+
+static int __Pyx_ParseOptionalKeywords(PyObject *kwds, PyObject **argnames[],     PyObject *kwds2, PyObject *values[], Py_ssize_t num_pos_args,     const char* function_name); /*proto*/
+
+static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
+    const char *name, int exact); /*proto*/
+
+/* Run-time type information about structs used with buffers */
+struct __Pyx_StructField_;
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+typedef struct {
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+  struct __Pyx_StructField_* fields;
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+} __Pyx_TypeInfo;
+
+typedef struct __Pyx_StructField_ {
+  __Pyx_TypeInfo* type;
+  const char* name;
+  size_t offset;
+} __Pyx_StructField;
+
+typedef struct {
+  __Pyx_StructField* field;
+  size_t parent_offset;
+} __Pyx_BufFmt_StackElem;
+
+
+static CYTHON_INLINE int  __Pyx_GetBufferAndValidate(Py_buffer* buf, PyObject* obj, __Pyx_TypeInfo* dtype, int flags, int nd, int cast, __Pyx_BufFmt_StackElem* stack);
+static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info);
+
+static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
+static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Generic(PyObject *o, PyObject* j) {
+    PyObject *r;
+    if (!j) return NULL;
+    r = PyObject_GetItem(o, j);
+    Py_DECREF(j);
+    return r;
+}
+
+
+#define __Pyx_GetItemInt_List(o, i, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
+                                                    __Pyx_GetItemInt_List_Fast(o, i) : \
+                                                    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_List_Fast(PyObject *o, Py_ssize_t i) {
+    if (likely(o != Py_None)) {
+        if (likely((0 <= i) & (i < PyList_GET_SIZE(o)))) {
+            PyObject *r = PyList_GET_ITEM(o, i);
+            Py_INCREF(r);
+            return r;
+        }
+        else if ((-PyList_GET_SIZE(o) <= i) & (i < 0)) {
+            PyObject *r = PyList_GET_ITEM(o, PyList_GET_SIZE(o) + i);
+            Py_INCREF(r);
+            return r;
+        }
+    }
+    return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
+}
+
+#define __Pyx_GetItemInt_Tuple(o, i, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
+                                                    __Pyx_GetItemInt_Tuple_Fast(o, i) : \
+                                                    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Tuple_Fast(PyObject *o, Py_ssize_t i) {
+    if (likely(o != Py_None)) {
+        if (likely((0 <= i) & (i < PyTuple_GET_SIZE(o)))) {
+            PyObject *r = PyTuple_GET_ITEM(o, i);
+            Py_INCREF(r);
+            return r;
+        }
+        else if ((-PyTuple_GET_SIZE(o) <= i) & (i < 0)) {
+            PyObject *r = PyTuple_GET_ITEM(o, PyTuple_GET_SIZE(o) + i);
+            Py_INCREF(r);
+            return r;
+        }
+    }
+    return __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
+}
+
+
+#define __Pyx_GetItemInt(o, i, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
+                                                    __Pyx_GetItemInt_Fast(o, i) : \
+                                                    __Pyx_GetItemInt_Generic(o, to_py_func(i)))
+
+static CYTHON_INLINE PyObject *__Pyx_GetItemInt_Fast(PyObject *o, Py_ssize_t i) {
+    PyObject *r;
+    if (PyList_CheckExact(o) && ((0 <= i) & (i < PyList_GET_SIZE(o)))) {
+        r = PyList_GET_ITEM(o, i);
+        Py_INCREF(r);
+    }
+    else if (PyTuple_CheckExact(o) && ((0 <= i) & (i < PyTuple_GET_SIZE(o)))) {
+        r = PyTuple_GET_ITEM(o, i);
+        Py_INCREF(r);
+    }
+    else if (Py_TYPE(o)->tp_as_sequence && Py_TYPE(o)->tp_as_sequence->sq_item && (likely(i >= 0))) {
+        r = PySequence_GetItem(o, i);
+    }
+    else {
+        r = __Pyx_GetItemInt_Generic(o, PyInt_FromSsize_t(i));
+    }
+    return r;
+}
+
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type); /*proto*/
+#define __Pyx_BufPtrStrided1d(type, buf, i0, s0) (type)((char*)buf + i0 * s0)
+#define __Pyx_BufPtrStrided4d(type, buf, i0, s0, i1, s1, i2, s2, i3, s3) (type)((char*)buf + i0 * s0 + i1 * s1 + i2 * s2 + i3 * s3)
+#define __Pyx_BufPtrStrided2d(type, buf, i0, s0, i1, s1) (type)((char*)buf + i0 * s0 + i1 * s1)
+
+static void __Pyx_RaiseBufferFallbackError(void); /*proto*/
+#define __Pyx_BufPtrStrided3d(type, buf, i0, s0, i1, s1, i2, s2) (type)((char*)buf + i0 * s0 + i1 * s1 + i2 * s2)
+static void __Pyx_RaiseBufferIndexError(int axis); /*proto*/
+
+static CYTHON_INLINE long __Pyx_mod_long(long, long); /* proto */
+
+static CYTHON_INLINE PyObject* __Pyx_PyObject_Append(PyObject* L, PyObject* x) {
+    if (likely(PyList_CheckExact(L))) {
+        if (PyList_Append(L, x) < 0) return NULL;
+        Py_INCREF(Py_None);
+        return Py_None; /* this is just to have an accurate signature */
+    }
+    else {
+        PyObject *r, *m;
+        m = __Pyx_GetAttrString(L, "append");
+        if (!m) return NULL;
+        r = PyObject_CallFunctionObjArgs(m, x, NULL);
+        Py_DECREF(m);
+        return r;
+    }
+}
+
+static CYTHON_INLINE long __Pyx_div_long(long, long); /* proto */
+
+static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index);
+
+static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected);
+
+static PyObject *__Pyx_UnpackItem(PyObject *, Py_ssize_t index); /*proto*/
+static int __Pyx_EndUnpack(PyObject *, Py_ssize_t expected); /*proto*/
+
+#define __Pyx_SetItemInt(o, i, v, size, to_py_func) (((size) <= sizeof(Py_ssize_t)) ? \
+                                                    __Pyx_SetItemInt_Fast(o, i, v) : \
+                                                    __Pyx_SetItemInt_Generic(o, to_py_func(i), v))
+
+static CYTHON_INLINE int __Pyx_SetItemInt_Generic(PyObject *o, PyObject *j, PyObject *v) {
+    int r;
+    if (!j) return -1;
+    r = PyObject_SetItem(o, j, v);
+    Py_DECREF(j);
+    return r;
+}
+
+static CYTHON_INLINE int __Pyx_SetItemInt_Fast(PyObject *o, Py_ssize_t i, PyObject *v) {
+    if (PyList_CheckExact(o) && ((0 <= i) & (i < PyList_GET_SIZE(o)))) {
+        Py_INCREF(v);
+        Py_DECREF(PyList_GET_ITEM(o, i));
+        PyList_SET_ITEM(o, i, v);
+        return 1;
+    }
+    else if (Py_TYPE(o)->tp_as_sequence && Py_TYPE(o)->tp_as_sequence->sq_ass_item && (likely(i >= 0)))
+        return PySequence_SetItem(o, i, v);
+    else {
+        PyObject *j = PyInt_FromSsize_t(i);
+        return __Pyx_SetItemInt_Generic(o, j, v);
+    }
+}
+
+static CYTHON_INLINE __pyx_t_5numpy_int64_t __Pyx_div___pyx_t_5numpy_int64_t(__pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t); /* proto */
+
+#define UNARY_NEG_WOULD_OVERFLOW(x)		(((x) < 0) & ((unsigned long)(x) == 0-(unsigned long)(x)))
+
+static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void);
+
+static void __Pyx_UnpackTupleError(PyObject *, Py_ssize_t index); /*proto*/
+#if PY_MAJOR_VERSION < 3
+static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags);
+static void __Pyx_ReleaseBuffer(Py_buffer *view);
+#else
+#define __Pyx_GetBuffer PyObject_GetBuffer
+#define __Pyx_ReleaseBuffer PyBuffer_Release
+#endif
+
+Py_ssize_t __Pyx_zeros[] = {0, 0, 0, 0};
+Py_ssize_t __Pyx_minusones[] = {-1, -1, -1, -1};
+
+static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list); /*proto*/
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_intp(npy_intp);
+
+static CYTHON_INLINE npy_int32 __Pyx_PyInt_from_py_npy_int32(PyObject *);
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int32(npy_int32);
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+static int __Pyx_Print(PyObject*, PyObject *, int); /*proto*/
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+static PyObject* __pyx_print = 0;
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+static CYTHON_INLINE npy_int64 __Pyx_PyInt_from_py_npy_int64(PyObject *);
+
+static int __Pyx_PrintOne(PyObject* stream, PyObject *o); /*proto*/
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+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
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+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int64(npy_int64);
+
+#if PY_VERSION_HEX < 0x02050000
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+
+#define Pyx_PyFrozenSet_New(iterable) \
+    PyObject_CallFunctionObjArgs((PyObject *)&PyFrozenSet_Type, (iterable), NULL)
+
+#define PySet_Size(anyset) \
+    PyObject_Size((anyset))
+
+#define PySet_Contains(anyset, key) \
+    PySequence_Contains((anyset), (key))
+
+#define PySet_Pop(set) \
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+    Py_DECREF(ret); return 0;
+}
+
+static CYTHON_INLINE int PySet_Discard(PyObject *set, PyObject *key) {
+    PyObject *ret = PyObject_CallMethod(set, (char *)"discard", (char *)"O", key);
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+    Py_DECREF(ret); return 0;
+}
+
+static CYTHON_INLINE int PySet_Add(PyObject *set, PyObject *key) {
+    PyObject *ret = PyObject_CallMethod(set, (char *)"add", (char *)"O", key);
+    if (!ret) return -1;
+    Py_DECREF(ret); return 0;
+}
+
+#endif /* PyAnySet_CheckExact (<= Py2.4) */
+
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+
+static PyTypeObject *__Pyx_PySet_Type = NULL;
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+
+#define PySet_Type (*__Pyx_PySet_Type)
+#define PyFrozenSet_Type (*__Pyx_PyFrozenSet_Type)
+
+#define PyAnySet_Check(ob) \
+    (PyAnySet_CheckExact(ob) || \
+     PyType_IsSubtype((ob)->ob_type, &PySet_Type) || \
+     PyType_IsSubtype((ob)->ob_type, &PyFrozenSet_Type))
+
+#define PyFrozenSet_CheckExact(ob) ((ob)->ob_type == &PyFrozenSet_Type)
+
+static int __Pyx_Py23SetsImport(void) {
+    PyObject *sets=0, *Set=0, *ImmutableSet=0;
+
+    sets = PyImport_ImportModule((char *)"sets");
+    if (!sets) goto bad;
+    Set = PyObject_GetAttrString(sets, (char *)"Set");
+    if (!Set) goto bad;
+    ImmutableSet = PyObject_GetAttrString(sets, (char *)"ImmutableSet");
+    if (!ImmutableSet) goto bad;
+    Py_DECREF(sets);
+
+    __Pyx_PySet_Type       = (PyTypeObject*) Set;
+    __Pyx_PyFrozenSet_Type = (PyTypeObject*) ImmutableSet;
+
+    return 0;
+
+ bad:
+    Py_XDECREF(sets);
+    Py_XDECREF(Set);
+    Py_XDECREF(ImmutableSet);
+    return -1;
+}
+
+#else
+static int __Pyx_Py23SetsImport(void) { return 0; }
+#endif /* !Py_SETOBJECT_H */
+#endif /* < Py2.4  */
+#endif /* < Py2.5  */
+
+static CYTHON_INLINE png_uint_32 __Pyx_PyInt_from_py_png_uint_32(PyObject *);
+
+static CYTHON_INLINE long __Pyx_pow_long(long, long); /* proto */
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    #define __Pyx_CREAL(z) ((z).real())
+    #define __Pyx_CIMAG(z) ((z).imag())
+  #else
+    #define __Pyx_CREAL(z) (__real__(z))
+    #define __Pyx_CIMAG(z) (__imag__(z))
+  #endif
+#else
+    #define __Pyx_CREAL(z) ((z).real)
+    #define __Pyx_CIMAG(z) ((z).imag)
+#endif
+
+#if defined(_WIN32) && defined(__cplusplus) && CYTHON_CCOMPLEX
+    #define __Pyx_SET_CREAL(z,x) ((z).real(x))
+    #define __Pyx_SET_CIMAG(z,y) ((z).imag(y))
+#else
+    #define __Pyx_SET_CREAL(z,x) __Pyx_CREAL(z) = (x)
+    #define __Pyx_SET_CIMAG(z,y) __Pyx_CIMAG(z) = (y)
+#endif
+
+static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float, float);
+
+#if CYTHON_CCOMPLEX
+    #define __Pyx_c_eqf(a, b)   ((a)==(b))
+    #define __Pyx_c_sumf(a, b)  ((a)+(b))
+    #define __Pyx_c_difff(a, b) ((a)-(b))
+    #define __Pyx_c_prodf(a, b) ((a)*(b))
+    #define __Pyx_c_quotf(a, b) ((a)/(b))
+    #define __Pyx_c_negf(a)     (-(a))
+  #ifdef __cplusplus
+    #define __Pyx_c_is_zerof(z) ((z)==(float)0)
+    #define __Pyx_c_conjf(z)    (::std::conj(z))
+    /*#define __Pyx_c_absf(z)     (::std::abs(z))*/
+  #else
+    #define __Pyx_c_is_zerof(z) ((z)==0)
+    #define __Pyx_c_conjf(z)    (conjf(z))
+    /*#define __Pyx_c_absf(z)     (cabsf(z))*/
+ #endif
+#else
+    static CYTHON_INLINE int __Pyx_c_eqf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_sumf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_difff(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_prodf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_quotf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_negf(__pyx_t_float_complex);
+    static CYTHON_INLINE int __Pyx_c_is_zerof(__pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_conjf(__pyx_t_float_complex);
+    /*static CYTHON_INLINE float __Pyx_c_absf(__pyx_t_float_complex);*/
+#endif
+
+static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double, double);
+
+#if CYTHON_CCOMPLEX
+    #define __Pyx_c_eq(a, b)   ((a)==(b))
+    #define __Pyx_c_sum(a, b)  ((a)+(b))
+    #define __Pyx_c_diff(a, b) ((a)-(b))
+    #define __Pyx_c_prod(a, b) ((a)*(b))
+    #define __Pyx_c_quot(a, b) ((a)/(b))
+    #define __Pyx_c_neg(a)     (-(a))
+  #ifdef __cplusplus
+    #define __Pyx_c_is_zero(z) ((z)==(double)0)
+    #define __Pyx_c_conj(z)    (::std::conj(z))
+    /*#define __Pyx_c_abs(z)     (::std::abs(z))*/
+  #else
+    #define __Pyx_c_is_zero(z) ((z)==0)
+    #define __Pyx_c_conj(z)    (conj(z))
+    /*#define __Pyx_c_abs(z)     (cabs(z))*/
+ #endif
+#else
+    static CYTHON_INLINE int __Pyx_c_eq(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_sum(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_diff(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_prod(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_quot(__pyx_t_double_complex, __pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_neg(__pyx_t_double_complex);
+    static CYTHON_INLINE int __Pyx_c_is_zero(__pyx_t_double_complex);
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_conj(__pyx_t_double_complex);
+    /*static CYTHON_INLINE double __Pyx_c_abs(__pyx_t_double_complex);*/
+#endif
+
+static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject *);
+
+static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject *);
+
+static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject *);
+
+static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject *);
+
+static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject *);
+
+static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject *);
+
+static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject *);
+
+static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject *);
+
+static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject *);
+
+static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject *);
+
+static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject *);
+
+static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject *);
+
+static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject *);
+
+static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject *);
+
+static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject *);
+
+static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject *);
+
+static void __Pyx_WriteUnraisable(const char *name); /*proto*/
+
+static int __Pyx_SetVtable(PyObject *dict, void *vtable); /*proto*/
+
+static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name, long size, int strict);  /*proto*/
+
+static PyObject *__Pyx_ImportModule(const char *name); /*proto*/
+
+static void __Pyx_AddTraceback(const char *funcname); /*proto*/
+
+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
+/* Module declarations from cpython.buffer */
+
+/* Module declarations from cpython.ref */
+
+/* Module declarations from libc.stdio */
+
+/* Module declarations from cpython.object */
+
+/* Module declarations from libc.stdlib */
+
+/* Module declarations from numpy */
+
+/* Module declarations from numpy */
+
+static PyTypeObject *__pyx_ptype_5numpy_dtype = 0;
+static PyTypeObject *__pyx_ptype_5numpy_flatiter = 0;
+static PyTypeObject *__pyx_ptype_5numpy_broadcast = 0;
+static PyTypeObject *__pyx_ptype_5numpy_ndarray = 0;
+static PyTypeObject *__pyx_ptype_5numpy_ufunc = 0;
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew1(PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew2(PyObject *, PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew3(PyObject *, PyObject *, PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew4(PyObject *, PyObject *, PyObject *, PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_PyArray_MultiIterNew5(PyObject *, PyObject *, PyObject *, PyObject *, PyObject *); /*proto*/
+static CYTHON_INLINE char *__pyx_f_5numpy__util_dtypestring(PyArray_Descr *, char *, char *, int *); /*proto*/
+static CYTHON_INLINE void __pyx_f_5numpy_set_array_base(PyArrayObject *, PyObject *); /*proto*/
+static CYTHON_INLINE PyObject *__pyx_f_5numpy_get_array_base(PyArrayObject *); /*proto*/
+/* Module declarations from cython */
+
+/* Module declarations from stdlib */
+
+/* Module declarations from stdio */
+
+/* Module declarations from yt.amr_utils */
+
+static PyTypeObject *__pyx_ptype_2yt_9amr_utils_position = 0;
+static PyTypeObject *__pyx_ptype_2yt_9amr_utils_OctreeGrid = 0;
+static PyTypeObject *__pyx_ptype_2yt_9amr_utils_OctreeGridList = 0;
+static PyTypeObject *__pyx_ptype_2yt_9amr_utils_VectorPlane = 0;
+static PyTypeObject *__pyx_ptype_2yt_9amr_utils_TransferFunctionProxy = 0;
+static PyTypeObject *__pyx_ptype_2yt_9amr_utils_PartitionedGrid = 0;
+static PyTypeObject *__pyx_ptype_2yt_9amr_utils_GridFace = 0;
+static PyTypeObject *__pyx_ptype_2yt_9amr_utils_ProtoPrism = 0;
+static PyTypeObject *__pyx_ptype_2yt_9amr_utils_QuadTree = 0;
+static CYTHON_INLINE void __pyx_f_2yt_9amr_utils_set_rotated_pos(__pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t (*)[3], __pyx_t_5numpy_float64_t *, int, int, int); /*proto*/
+static void __pyx_f_2yt_9amr_utils_normalize_vector(__pyx_t_5numpy_float64_t *); /*proto*/
+static void __pyx_f_2yt_9amr_utils_get_cross_product(__pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *); /*proto*/
+static int __pyx_f_2yt_9amr_utils_check_projected_overlap(__pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, int, __pyx_t_5numpy_float64_t (*)[3], __pyx_t_5numpy_float64_t (*)[3]); /*proto*/
+static CYTHON_INLINE int __pyx_f_2yt_9amr_utils_imax(int, int); /*proto*/
+static CYTHON_INLINE __pyx_t_5numpy_float64_t __pyx_f_2yt_9amr_utils_fmax(__pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t); /*proto*/
+static CYTHON_INLINE int __pyx_f_2yt_9amr_utils_imin(int, int); /*proto*/
+static CYTHON_INLINE __pyx_t_5numpy_float64_t __pyx_f_2yt_9amr_utils_fmin(__pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t); /*proto*/
+static CYTHON_INLINE int __pyx_f_2yt_9amr_utils_iclip(int, int, int); /*proto*/
+static CYTHON_INLINE __pyx_t_5numpy_float64_t __pyx_f_2yt_9amr_utils_fclip(__pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t); /*proto*/
+static void __pyx_f_2yt_9amr_utils_FIT_initialize_table(struct __pyx_t_2yt_9amr_utils_FieldInterpolationTable *, int, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, int, struct __pyx_opt_args_2yt_9amr_utils_FIT_initialize_table *__pyx_optional_args); /*proto*/
+static __pyx_t_5numpy_float64_t __pyx_f_2yt_9amr_utils_FIT_get_value(struct __pyx_t_2yt_9amr_utils_FieldInterpolationTable *, __pyx_t_5numpy_float64_t *); /*proto*/
+static CYTHON_INLINE __pyx_t_5numpy_int64_t __pyx_f_2yt_9amr_utils_i64max(__pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t); /*proto*/
+static CYTHON_INLINE __pyx_t_5numpy_int64_t __pyx_f_2yt_9amr_utils_i64min(__pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t); /*proto*/
+static CYTHON_INLINE int __pyx_f_2yt_9amr_utils_are_neighbors(__pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t); /*proto*/
+static void __pyx_f_2yt_9amr_utils_QTN_add_value(struct __pyx_t_2yt_9amr_utils_QuadTreeNode *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t); /*proto*/
+static void __pyx_f_2yt_9amr_utils_QTN_refine(struct __pyx_t_2yt_9amr_utils_QuadTreeNode *); /*proto*/
+static struct __pyx_t_2yt_9amr_utils_QuadTreeNode *__pyx_f_2yt_9amr_utils_QTN_initialize(__pyx_t_5numpy_int64_t *, int, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t, int); /*proto*/
+static void __pyx_f_2yt_9amr_utils_QTN_free(struct __pyx_t_2yt_9amr_utils_QuadTreeNode *); /*proto*/
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int32_t = { "int32_t", NULL, sizeof(__pyx_t_5numpy_int32_t), 'I' };
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t = { "float64_t", NULL, sizeof(__pyx_t_5numpy_float64_t), 'R' };
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int_t = { "int_t", NULL, sizeof(__pyx_t_5numpy_int_t), 'I' };
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int8_t = { "int8_t", NULL, sizeof(__pyx_t_5numpy_int8_t), 'I' };
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_float_t = { "float_t", NULL, sizeof(__pyx_t_5numpy_float_t), 'R' };
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_int64_t = { "int64_t", NULL, sizeof(__pyx_t_5numpy_int64_t), 'I' };
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_float32_t = { "float32_t", NULL, sizeof(__pyx_t_5numpy_float32_t), 'R' };
+static __Pyx_TypeInfo __Pyx_TypeInfo_nn___pyx_t_5numpy_uint8_t = { "uint8_t", NULL, sizeof(__pyx_t_5numpy_uint8_t), 'U' };
+#define __Pyx_MODULE_NAME "yt.amr_utils"
+int __pyx_module_is_main_yt__amr_utils = 0;
+
+/* Implementation of yt.amr_utils */
+static PyObject *__pyx_builtin_range;
+static PyObject *__pyx_builtin_xrange;
+static PyObject *__pyx_builtin_RuntimeError;
+static PyObject *__pyx_builtin_ValueError;
+static char __pyx_k_1[] = "RecurseOctreeDepthFirst";
+static char __pyx_k_2[] = "RecurseOctreeByLevels";
+static char __pyx_k_3[] = "Field table";
+static char __pyx_k_4[] = "corresponds to";
+static char __pyx_k_5[] = "(Weighted with ";
+static char __pyx_k_6[] = ")";
+static char __pyx_k_7[] = "ndarray is not C contiguous";
+static char __pyx_k_8[] = "ndarray is not Fortran contiguous";
+static char __pyx_k_9[] = "Non-native byte order not supported";
+static char __pyx_k_10[] = "unknown dtype code in numpy.pxd (%d)";
+static char __pyx_k_11[] = "Format string allocated too short, see comment in numpy.pxd";
+static char __pyx_k_12[] = "Format string allocated too short.";
+static char __pyx_k_13[] = "\nContainer file to hold all our Cython routines.  This is to avoid problems with\nstatic linking.\n\nAuthor: Matthew Turk <matthewturk@gmail.com>\nAffiliation: KIPAC/SLAC/Stanford\nHomepage: http://yt.enzotools.org/\nLicense:\n  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.\n\n  This file is part of yt.\n\n  yt is free software; you can redistribute it and/or modify\n  it under the terms of the GNU General Public License as published by\n  the Free Software Foundation; either version 3 of the License, or\n  (at your option) any later version.\n\n  This program is distributed in the hope that it will be useful,\n  but WITHOUT ANY WARRANTY; without even the implied warranty of\n  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n  GNU General Public License for more details.\n\n  You should have received a copy of the GNU General Public License\n  along with this program.  If not, see <http://www.gnu.org/licenses/>.\n";
+static char __pyx_k_14[] = "Transfer3D (line 36)";
+static char __pyx_k_15[] = "TransferShells (line 74)";
+static char __pyx_k__B[] = "B";
+static char __pyx_k__F[] = "F";
+static char __pyx_k__H[] = "H";
+static char __pyx_k__I[] = "I";
+static char __pyx_k__L[] = "L";
+static char __pyx_k__O[] = "O";
+static char __pyx_k__Q[] = "Q";
+static char __pyx_k__a[] = "a";
+static char __pyx_k__b[] = "b";
+static char __pyx_k__d[] = "d";
+static char __pyx_k__e[] = "e";
+static char __pyx_k__f[] = "f";
+static char __pyx_k__g[] = "g";
+static char __pyx_k__h[] = "h";
+static char __pyx_k__i[] = "i";
+static char __pyx_k__l[] = "l";
+static char __pyx_k__q[] = "q";
+static char __pyx_k__u[] = "u";
+static char __pyx_k__v[] = "v";
+static char __pyx_k__x[] = "x";
+static char __pyx_k__y[] = "y";
+static char __pyx_k__z[] = "z";
+static char __pyx_k__Zd[] = "Zd";
+static char __pyx_k__Zf[] = "Zf";
+static char __pyx_k__Zg[] = "Zg";
+static char __pyx_k__cm[] = "cm";
+static char __pyx_k__dx[] = "dx";
+static char __pyx_k__dy[] = "dy";
+static char __pyx_k__dz[] = "dz";
+static char __pyx_k__fn[] = "fn";
+static char __pyx_k__gi[] = "gi";
+static char __pyx_k__np[] = "np";
+static char __pyx_k__ns[] = "ns";
+static char __pyx_k__nv[] = "nv";
+static char __pyx_k__pv[] = "pv";
+static char __pyx_k__px[] = "px";
+static char __pyx_k__py[] = "py";
+static char __pyx_k__rb[] = "rb";
+static char __pyx_k__tf[] = "tf";
+static char __pyx_k__ug[] = "ug";
+static char __pyx_k__vp[] = "vp";
+static char __pyx_k__wb[] = "wb";
+static char __pyx_k__buf[] = "buf";
+static char __pyx_k__dds[] = "dds";
+static char __pyx_k__dpi[] = "dpi";
+static char __pyx_k__dvs[] = "dvs";
+static char __pyx_k__i_f[] = "i_f";
+static char __pyx_k__i_i[] = "i_i";
+static char __pyx_k__i_s[] = "i_s";
+static char __pyx_k__ind[] = "ind";
+static char __pyx_k__j_f[] = "j_f";
+static char __pyx_k__j_i[] = "j_i";
+static char __pyx_k__k_f[] = "k_f";
+static char __pyx_k__k_i[] = "k_i";
+static char __pyx_k__o_s[] = "o_s";
+static char __pyx_k__obj[] = "obj";
+static char __pyx_k__pdx[] = "pdx";
+static char __pyx_k__pdy[] = "pdy";
+static char __pyx_k__po2[] = "po2";
+static char __pyx_k__pos[] = "pos";
+static char __pyx_k__pxs[] = "pxs";
+static char __pyx_k__pys[] = "pys";
+static char __pyx_k__red[] = "red";
+static char __pyx_k__val[] = "val";
+static char __pyx_k__base[] = "base";
+static char __pyx_k__blue[] = "blue";
+static char __pyx_k__copy[] = "copy";
+static char __pyx_k__data[] = "data";
+static char __pyx_k__dbin[] = "dbin";
+static char __pyx_k__dims[] = "dims";
+static char __pyx_k__gray[] = "gray";
+static char __pyx_k__grid[] = "grid";
+static char __pyx_k__idds[] = "idds";
+static char __pyx_k__imax[] = "imax";
+static char __pyx_k__imin[] = "imin";
+static char __pyx_k__int8[] = "int8";
+static char __pyx_k__jmax[] = "jmax";
+static char __pyx_k__jmin[] = "jmin";
+static char __pyx_k__kmax[] = "kmax";
+static char __pyx_k__kmin[] = "kmin";
+static char __pyx_k__left[] = "left";
+static char __pyx_k__mask[] = "mask";
+static char __pyx_k__mass[] = "mass";
+static char __pyx_k__ndim[] = "ndim";
+static char __pyx_k__posx[] = "posx";
+static char __pyx_k__posy[] = "posy";
+static char __pyx_k__posz[] = "posz";
+static char __pyx_k__x_is[] = "x_is";
+static char __pyx_k__y_is[] = "y_is";
+static char __pyx_k__z_is[] = "z_is";
+static char __pyx_k__alpha[] = "alpha";
+static char __pyx_k__coord[] = "coord";
+static char __pyx_k__descr[] = "descr";
+static char __pyx_k__dtype[] = "dtype";
+static char __pyx_k__empty[] = "empty";
+static char __pyx_k__field[] = "field";
+static char __pyx_k__floor[] = "floor";
+static char __pyx_k__green[] = "green";
+static char __pyx_k__grids[] = "grids";
+static char __pyx_k__idbin[] = "idbin";
+static char __pyx_k__image[] = "image";
+static char __pyx_k__int32[] = "int32";
+static char __pyx_k__int64[] = "int64";
+static char __pyx_k__joins[] = "joins";
+static char __pyx_k__level[] = "level";
+static char __pyx_k__names[] = "names";
+static char __pyx_k__nbins[] = "nbins";
+static char __pyx_k__numpy[] = "numpy";
+static char __pyx_k__nvals[] = "nvals";
+static char __pyx_k__order[] = "order";
+static char __pyx_k__pmask[] = "pmask";
+static char __pyx_k__pvals[] = "pvals";
+static char __pyx_k__range[] = "range";
+static char __pyx_k__shape[] = "shape";
+static char __pyx_k__split[] = "split";
+static char __pyx_k__stack[] = "stack";
+static char __pyx_k__sweep[] = "sweep";
+static char __pyx_k__table[] = "table";
+static char __pyx_k__wvals[] = "wvals";
+static char __pyx_k__x_vec[] = "x_vec";
+static char __pyx_k__y_vec[] = "y_vec";
+static char __pyx_k__zeros[] = "zeros";
+static char __pyx_k__aimage[] = "aimage";
+static char __pyx_k__ax_vec[] = "ax_vec";
+static char __pyx_k__ay_vec[] = "ay_vec";
+static char __pyx_k__bounds[] = "bounds";
+static char __pyx_k__buffer[] = "buffer";
+static char __pyx_k__center[] = "center";
+static char __pyx_k__curpos[] = "curpos";
+static char __pyx_k__fields[] = "fields";
+static char __pyx_k__format[] = "format";
+static char __pyx_k__grid_t[] = "grid_t";
+static char __pyx_k__offset[] = "offset";
+static char __pyx_k__output[] = "output";
+static char __pyx_k__points[] = "points";
+static char __pyx_k__shells[] = "shells";
+static char __pyx_k__tables[] = "tables";
+static char __pyx_k__tf_obj[] = "tf_obj";
+static char __pyx_k__values[] = "values";
+static char __pyx_k__vp_dir[] = "vp_dir";
+static char __pyx_k__vp_pos[] = "vp_pos";
+static char __pyx_k__x_bins[] = "x_bins";
+static char __pyx_k__x_vals[] = "x_vals";
+static char __pyx_k__xrange[] = "xrange";
+static char __pyx_k__y_bins[] = "y_bins";
+static char __pyx_k__y_vals[] = "y_vals";
+static char __pyx_k__z_bins[] = "z_bins";
+static char __pyx_k__z_vals[] = "z_vals";
+static char __pyx_k__Channel[] = "Channel";
+static char __pyx_k__acenter[] = "acenter";
+static char __pyx_k__avp_dir[] = "avp_dir";
+static char __pyx_k__avp_pos[] = "avp_pos";
+static char __pyx_k__corners[] = "corners";
+static char __pyx_k__float32[] = "float32";
+static char __pyx_k__float64[] = "float64";
+static char __pyx_k__grid_dt[] = "grid_dt";
+static char __pyx_k__istride[] = "istride";
+static char __pyx_k__jstride[] = "jstride";
+static char __pyx_k__max_ind[] = "max_ind";
+static char __pyx_k__my_data[] = "my_data";
+static char __pyx_k__nshells[] = "nshells";
+static char __pyx_k__refined[] = "refined";
+static char __pyx_k__rot_mat[] = "rot_mat";
+static char __pyx_k__strides[] = "strides";
+static char __pyx_k__LeftEdge[] = "LeftEdge";
+static char __pyx_k____main__[] = "__main__";
+static char __pyx_k____test__[] = "__test__";
+static char __pyx_k__cellSize[] = "cellSize";
+static char __pyx_k__children[] = "children";
+static char __pyx_k__field_id[] = "field_id";
+static char __pyx_k__filename[] = "filename";
+static char __pyx_k__grid_dds[] = "grid_dds";
+static char __pyx_k__istorage[] = "istorage";
+static char __pyx_k__itemsize[] = "itemsize";
+static char __pyx_k__leftEdge[] = "leftEdge";
+static char __pyx_k__n_fields[] = "n_fields";
+static char __pyx_k__readonly[] = "readonly";
+static char __pyx_k__type_num[] = "type_num";
+static char __pyx_k__x_bounds[] = "x_bounds";
+static char __pyx_k__RightEdge[] = "RightEdge";
+static char __pyx_k__byteorder[] = "byteorder";
+static char __pyx_k__copy_back[] = "copy_back";
+static char __pyx_k__copy_into[] = "copy_into";
+static char __pyx_k__direction[] = "direction";
+static char __pyx_k__field_ids[] = "field_ids";
+static char __pyx_k__genealogy[] = "genealogy";
+static char __pyx_k__grid_mask[] = "grid_mask";
+static char __pyx_k__left_edge[] = "left_edge";
+static char __pyx_k__root_size[] = "root_size";
+static char __pyx_k__slab_size[] = "slab_size";
+static char __pyx_k__Transfer3D[] = "Transfer3D";
+static char __pyx_k__ValueError[] = "ValueError";
+static char __pyx_k__box_center[] = "box_center";
+static char __pyx_k__box_origin[] = "box_origin";
+static char __pyx_k__child_mask[] = "child_mask";
+static char __pyx_k__count_only[] = "count_only";
+static char __pyx_k__dimensions[] = "dimensions";
+static char __pyx_k__im_strides[] = "im_strides";
+static char __pyx_k__left_edges[] = "left_edges";
+static char __pyx_k__npositions[] = "npositions";
+static char __pyx_k__output_pos[] = "output_pos";
+static char __pyx_k__right_edge[] = "right_edge";
+static char __pyx_k__root_nodes[] = "root_nodes";
+static char __pyx_k__slab_start[] = "slab_start";
+static char __pyx_k__suboffsets[] = "suboffsets";
+static char __pyx_k__vd_strides[] = "vd_strides";
+static char __pyx_k__vp_strides[] = "vp_strides";
+static char __pyx_k__weight_val[] = "weight_val";
+static char __pyx_k__box_lengths[] = "box_lengths";
+static char __pyx_k__box_vectors[] = "box_vectors";
+static char __pyx_k__break_first[] = "break_first";
+static char __pyx_k__refined_pos[] = "refined_pos";
+static char __pyx_k__start_index[] = "start_index";
+static char __pyx_k__RuntimeError[] = "RuntimeError";
+static char __pyx_k__field_tables[] = "field_tables";
+static char __pyx_k__pass_through[] = "pass_through";
+static char __pyx_k__proj_overlap[] = "proj_overlap";
+static char __pyx_k__pweight_vals[] = "pweight_vals";
+static char __pyx_k__child_indices[] = "child_indices";
+static char __pyx_k__eval_transfer[] = "eval_transfer";
+static char __pyx_k__gridDimension[] = "gridDimension";
+static char __pyx_k__integrate_ray[] = "integrate_ray";
+static char __pyx_k__sample_values[] = "sample_values";
+static char __pyx_k__subgrid_faces[] = "subgrid_faces";
+static char __pyx_k__top_grid_dims[] = "top_grid_dims";
+static char __pyx_k__TransferShells[] = "TransferShells";
+static char __pyx_k__count_at_level[] = "count_at_level";
+static char __pyx_k__get_start_stop[] = "get_start_stop";
+static char __pyx_k__grid_left_edge[] = "grid_left_edge";
+static char __pyx_k__n_field_tables[] = "n_field_tables";
+static char __pyx_k__parent_grid_id[] = "parent_grid_id";
+static char __pyx_k__add_to_position[] = "add_to_position";
+static char __pyx_k__field_table_ids[] = "field_table_ids";
+static char __pyx_k__fill_from_level[] = "fill_from_level";
+static char __pyx_k__grid_left_edges[] = "grid_left_edges";
+static char __pyx_k__grid_right_edge[] = "grid_right_edge";
+static char __pyx_k__my_field_tables[] = "my_field_tables";
+static char __pyx_k__weight_field_id[] = "weight_field_id";
+static char __pyx_k__weight_table_id[] = "weight_table_id";
+static char __pyx_k__calculate_extent[] = "calculate_extent";
+static char __pyx_k__grid_right_edges[] = "grid_right_edges";
+static char __pyx_k__weight_field_ids[] = "weight_field_ids";
+static char __pyx_k__weight_table_ids[] = "weight_table_ids";
+static char __pyx_k__find_on_root_level[] = "find_on_root_level";
+static PyObject *__pyx_n_s_1;
+static PyObject *__pyx_kp_u_10;
+static PyObject *__pyx_kp_u_11;
+static PyObject *__pyx_kp_u_12;
+static PyObject *__pyx_kp_u_14;
+static PyObject *__pyx_kp_u_15;
+static PyObject *__pyx_n_s_2;
+static PyObject *__pyx_kp_s_3;
+static PyObject *__pyx_kp_s_4;
+static PyObject *__pyx_kp_s_5;
+static PyObject *__pyx_kp_s_6;
+static PyObject *__pyx_kp_u_7;
+static PyObject *__pyx_kp_u_8;
+static PyObject *__pyx_kp_u_9;
+static PyObject *__pyx_n_s__Channel;
+static PyObject *__pyx_n_s__F;
+static PyObject *__pyx_n_s__LeftEdge;
+static PyObject *__pyx_n_s__RightEdge;
+static PyObject *__pyx_n_s__RuntimeError;
+static PyObject *__pyx_n_s__Transfer3D;
+static PyObject *__pyx_n_s__TransferShells;
+static PyObject *__pyx_n_s__ValueError;
+static PyObject *__pyx_n_s____main__;
+static PyObject *__pyx_n_s____test__;
+static PyObject *__pyx_n_s__a;
+static PyObject *__pyx_n_s__acenter;
+static PyObject *__pyx_n_s__add_to_position;
+static PyObject *__pyx_n_s__aimage;
+static PyObject *__pyx_n_s__alpha;
+static PyObject *__pyx_n_s__avp_dir;
+static PyObject *__pyx_n_s__avp_pos;
+static PyObject *__pyx_n_s__ax_vec;
+static PyObject *__pyx_n_s__ay_vec;
+static PyObject *__pyx_n_s__base;
+static PyObject *__pyx_n_s__blue;
+static PyObject *__pyx_n_s__bounds;
+static PyObject *__pyx_n_s__box_center;
+static PyObject *__pyx_n_s__box_lengths;
+static PyObject *__pyx_n_s__box_origin;
+static PyObject *__pyx_n_s__box_vectors;
+static PyObject *__pyx_n_s__break_first;
+static PyObject *__pyx_n_s__buf;
+static PyObject *__pyx_n_s__buffer;
+static PyObject *__pyx_n_s__byteorder;
+static PyObject *__pyx_n_s__calculate_extent;
+static PyObject *__pyx_n_s__cellSize;
+static PyObject *__pyx_n_s__center;
+static PyObject *__pyx_n_s__child_indices;
+static PyObject *__pyx_n_s__child_mask;
+static PyObject *__pyx_n_s__children;
+static PyObject *__pyx_n_s__cm;
+static PyObject *__pyx_n_s__coord;
+static PyObject *__pyx_n_s__copy;
+static PyObject *__pyx_n_s__copy_back;
+static PyObject *__pyx_n_s__copy_into;
+static PyObject *__pyx_n_s__corners;
+static PyObject *__pyx_n_s__count_at_level;
+static PyObject *__pyx_n_s__count_only;
+static PyObject *__pyx_n_s__curpos;
+static PyObject *__pyx_n_s__data;
+static PyObject *__pyx_n_s__dbin;
+static PyObject *__pyx_n_s__dds;
+static PyObject *__pyx_n_s__descr;
+static PyObject *__pyx_n_s__dimensions;
+static PyObject *__pyx_n_s__dims;
+static PyObject *__pyx_n_s__direction;
+static PyObject *__pyx_n_s__dpi;
+static PyObject *__pyx_n_s__dtype;
+static PyObject *__pyx_n_s__dvs;
+static PyObject *__pyx_n_s__dx;
+static PyObject *__pyx_n_s__dy;
+static PyObject *__pyx_n_s__dz;
+static PyObject *__pyx_n_s__e;
+static PyObject *__pyx_n_s__empty;
+static PyObject *__pyx_n_s__eval_transfer;
+static PyObject *__pyx_n_s__field;
+static PyObject *__pyx_n_s__field_id;
+static PyObject *__pyx_n_s__field_ids;
+static PyObject *__pyx_n_s__field_table_ids;
+static PyObject *__pyx_n_s__field_tables;
+static PyObject *__pyx_n_s__fields;
+static PyObject *__pyx_n_s__filename;
+static PyObject *__pyx_n_s__fill_from_level;
+static PyObject *__pyx_n_s__find_on_root_level;
+static PyObject *__pyx_n_s__float32;
+static PyObject *__pyx_n_s__float64;
+static PyObject *__pyx_n_s__floor;
+static PyObject *__pyx_n_s__fn;
+static PyObject *__pyx_n_s__format;
+static PyObject *__pyx_n_s__genealogy;
+static PyObject *__pyx_n_s__get_start_stop;
+static PyObject *__pyx_n_s__gi;
+static PyObject *__pyx_n_s__gray;
+static PyObject *__pyx_n_s__green;
+static PyObject *__pyx_n_s__grid;
+static PyObject *__pyx_n_s__gridDimension;
+static PyObject *__pyx_n_s__grid_dds;
+static PyObject *__pyx_n_s__grid_dt;
+static PyObject *__pyx_n_s__grid_left_edge;
+static PyObject *__pyx_n_s__grid_left_edges;
+static PyObject *__pyx_n_s__grid_mask;
+static PyObject *__pyx_n_s__grid_right_edge;
+static PyObject *__pyx_n_s__grid_right_edges;
+static PyObject *__pyx_n_s__grid_t;
+static PyObject *__pyx_n_s__grids;
+static PyObject *__pyx_n_s__i_f;
+static PyObject *__pyx_n_s__i_i;
+static PyObject *__pyx_n_s__i_s;
+static PyObject *__pyx_n_s__idbin;
+static PyObject *__pyx_n_s__idds;
+static PyObject *__pyx_n_s__im_strides;
+static PyObject *__pyx_n_s__image;
+static PyObject *__pyx_n_s__imax;
+static PyObject *__pyx_n_s__imin;
+static PyObject *__pyx_n_s__ind;
+static PyObject *__pyx_n_s__int32;
+static PyObject *__pyx_n_s__int64;
+static PyObject *__pyx_n_s__int8;
+static PyObject *__pyx_n_s__integrate_ray;
+static PyObject *__pyx_n_s__istorage;
+static PyObject *__pyx_n_s__istride;
+static PyObject *__pyx_n_s__itemsize;
+static PyObject *__pyx_n_s__j_f;
+static PyObject *__pyx_n_s__j_i;
+static PyObject *__pyx_n_s__jmax;
+static PyObject *__pyx_n_s__jmin;
+static PyObject *__pyx_n_s__joins;
+static PyObject *__pyx_n_s__jstride;
+static PyObject *__pyx_n_s__k_f;
+static PyObject *__pyx_n_s__k_i;
+static PyObject *__pyx_n_s__kmax;
+static PyObject *__pyx_n_s__kmin;
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+static PyObject *__pyx_n_s__left_edge;
+static PyObject *__pyx_n_s__left_edges;
+static PyObject *__pyx_n_s__level;
+static PyObject *__pyx_n_s__mask;
+static PyObject *__pyx_n_s__mass;
+static PyObject *__pyx_n_s__max_ind;
+static PyObject *__pyx_n_s__my_data;
+static PyObject *__pyx_n_s__my_field_tables;
+static PyObject *__pyx_n_s__n_field_tables;
+static PyObject *__pyx_n_s__n_fields;
+static PyObject *__pyx_n_s__names;
+static PyObject *__pyx_n_s__nbins;
+static PyObject *__pyx_n_s__ndim;
+static PyObject *__pyx_n_s__np;
+static PyObject *__pyx_n_s__npositions;
+static PyObject *__pyx_n_s__ns;
+static PyObject *__pyx_n_s__nshells;
+static PyObject *__pyx_n_s__numpy;
+static PyObject *__pyx_n_s__nv;
+static PyObject *__pyx_n_s__nvals;
+static PyObject *__pyx_n_s__o_s;
+static PyObject *__pyx_n_s__obj;
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+static PyObject *__pyx_n_s__order;
+static PyObject *__pyx_n_s__output;
+static PyObject *__pyx_n_s__output_pos;
+static PyObject *__pyx_n_s__parent_grid_id;
+static PyObject *__pyx_n_s__pass_through;
+static PyObject *__pyx_n_s__pdx;
+static PyObject *__pyx_n_s__pdy;
+static PyObject *__pyx_n_s__pmask;
+static PyObject *__pyx_n_s__po2;
+static PyObject *__pyx_n_s__points;
+static PyObject *__pyx_n_s__pos;
+static PyObject *__pyx_n_s__posx;
+static PyObject *__pyx_n_s__posy;
+static PyObject *__pyx_n_s__posz;
+static PyObject *__pyx_n_s__proj_overlap;
+static PyObject *__pyx_n_s__pv;
+static PyObject *__pyx_n_s__pvals;
+static PyObject *__pyx_n_s__pweight_vals;
+static PyObject *__pyx_n_s__px;
+static PyObject *__pyx_n_s__pxs;
+static PyObject *__pyx_n_s__py;
+static PyObject *__pyx_n_s__pys;
+static PyObject *__pyx_n_s__range;
+static PyObject *__pyx_n_s__readonly;
+static PyObject *__pyx_n_s__red;
+static PyObject *__pyx_n_s__refined;
+static PyObject *__pyx_n_s__refined_pos;
+static PyObject *__pyx_n_s__right_edge;
+static PyObject *__pyx_n_s__root_nodes;
+static PyObject *__pyx_n_s__root_size;
+static PyObject *__pyx_n_s__rot_mat;
+static PyObject *__pyx_n_s__sample_values;
+static PyObject *__pyx_n_s__shape;
+static PyObject *__pyx_n_s__shells;
+static PyObject *__pyx_n_s__slab_size;
+static PyObject *__pyx_n_s__slab_start;
+static PyObject *__pyx_n_s__split;
+static PyObject *__pyx_n_s__stack;
+static PyObject *__pyx_n_s__start_index;
+static PyObject *__pyx_n_s__strides;
+static PyObject *__pyx_n_s__subgrid_faces;
+static PyObject *__pyx_n_s__suboffsets;
+static PyObject *__pyx_n_s__sweep;
+static PyObject *__pyx_n_s__table;
+static PyObject *__pyx_n_s__tables;
+static PyObject *__pyx_n_s__tf;
+static PyObject *__pyx_n_s__tf_obj;
+static PyObject *__pyx_n_s__top_grid_dims;
+static PyObject *__pyx_n_s__type_num;
+static PyObject *__pyx_n_s__u;
+static PyObject *__pyx_n_s__ug;
+static PyObject *__pyx_n_s__v;
+static PyObject *__pyx_n_s__val;
+static PyObject *__pyx_n_s__values;
+static PyObject *__pyx_n_s__vd_strides;
+static PyObject *__pyx_n_s__vp;
+static PyObject *__pyx_n_s__vp_dir;
+static PyObject *__pyx_n_s__vp_pos;
+static PyObject *__pyx_n_s__vp_strides;
+static PyObject *__pyx_n_s__weight_field_id;
+static PyObject *__pyx_n_s__weight_field_ids;
+static PyObject *__pyx_n_s__weight_table_id;
+static PyObject *__pyx_n_s__weight_table_ids;
+static PyObject *__pyx_n_s__weight_val;
+static PyObject *__pyx_n_s__wvals;
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+static PyObject *__pyx_n_s__x_bins;
+static PyObject *__pyx_n_s__x_bounds;
+static PyObject *__pyx_n_s__x_is;
+static PyObject *__pyx_n_s__x_vals;
+static PyObject *__pyx_n_s__x_vec;
+static PyObject *__pyx_n_s__xrange;
+static PyObject *__pyx_n_s__y;
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+static PyObject *__pyx_n_s__y_is;
+static PyObject *__pyx_n_s__y_vals;
+static PyObject *__pyx_n_s__y_vec;
+static PyObject *__pyx_n_s__z;
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+static PyObject *__pyx_n_s__z_is;
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+static PyObject *__pyx_n_s__zeros;
+static PyObject *__pyx_int_0;
+static PyObject *__pyx_int_1;
+static PyObject *__pyx_int_2;
+static PyObject *__pyx_int_3;
+static PyObject *__pyx_int_15;
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+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/DepthFirstOctree.pyx":31
+ * 
+ * cdef class position:
+ *     cdef public int output_pos, refined_pos             # <<<<<<<<<<<<<<
+ *     def __cinit__(self):
+ *         self.output_pos = 0
+ */
+
+static PyObject *__pyx_pf_2yt_9amr_utils_8position_10output_pos___get__(PyObject *__pyx_v_self); /*proto*/
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+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":73
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+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":74
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+ *                            np.ndarray[np.float64_t, ndim=1] x_vals,
+ *                            np.ndarray[np.float64_t, ndim=1] y_vals,
+ */
+
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+  double __pyx_v_zm;
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_y_bins), __pyx_ptype_5numpy_ndarray, 1, "y_bins", 0))) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 82; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_z_bins), __pyx_ptype_5numpy_ndarray, 1, "z_bins", 0))) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 83; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_bshape_0_table = __pyx_bstruct_table.shape[0]; __pyx_bshape_1_table = __pyx_bstruct_table.shape[1]; __pyx_bshape_2_table = __pyx_bstruct_table.shape[2];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_x_vals, (PyObject*)__pyx_v_x_vals, &__Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_x_vals = __pyx_bstruct_x_vals.strides[0];
+  __pyx_bshape_0_x_vals = __pyx_bstruct_x_vals.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_y_vals, (PyObject*)__pyx_v_y_vals, &__Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_y_vals = __pyx_bstruct_y_vals.strides[0];
+  __pyx_bshape_0_y_vals = __pyx_bstruct_y_vals.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_z_vals, (PyObject*)__pyx_v_z_vals, &__Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_bstride_0_z_vals = __pyx_bstruct_z_vals.strides[0];
+  __pyx_bshape_0_z_vals = __pyx_bstruct_z_vals.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_x_bins, (PyObject*)__pyx_v_x_bins, &__Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_x_bins = __pyx_bstruct_x_bins.strides[0];
+  __pyx_bshape_0_x_bins = __pyx_bstruct_x_bins.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_y_bins, (PyObject*)__pyx_v_y_bins, &__Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_y_bins = __pyx_bstruct_y_bins.strides[0];
+  __pyx_bshape_0_y_bins = __pyx_bstruct_y_bins.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_z_bins, (PyObject*)__pyx_v_z_bins, &__Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_z_bins = __pyx_bstruct_z_bins.strides[0];
+  __pyx_bshape_0_z_bins = __pyx_bstruct_z_bins.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_x_is, (PyObject*)__pyx_v_x_is, &__Pyx_TypeInfo_nn___pyx_t_5numpy_int_t, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_x_is = __pyx_bstruct_x_is.strides[0];
+  __pyx_bshape_0_x_is = __pyx_bstruct_x_is.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_y_is, (PyObject*)__pyx_v_y_is, &__Pyx_TypeInfo_nn___pyx_t_5numpy_int_t, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_y_is = __pyx_bstruct_y_is.strides[0];
+  __pyx_bshape_0_y_is = __pyx_bstruct_y_is.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_z_is, (PyObject*)__pyx_v_z_is, &__Pyx_TypeInfo_nn___pyx_t_5numpy_int_t, PyBUF_FORMAT| PyBUF_STRIDES, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_z_is = __pyx_bstruct_z_is.strides[0];
+  __pyx_bshape_0_z_is = __pyx_bstruct_z_is.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_output, (PyObject*)__pyx_v_output, &__Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t, PyBUF_FORMAT| PyBUF_STRIDES| PyBUF_WRITABLE, 1, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 77; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_output = __pyx_bstruct_output.strides[0];
+  __pyx_bshape_0_output = __pyx_bstruct_output.shape[0];
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":93
+ *     cdef double dx_inv, dy_inv, dz_inv
+ *     cdef int i, x_i, y_i, z_i
+ *     for i in range(x_vals.shape[0]):             # <<<<<<<<<<<<<<
+ *         x_i = x_is[i]
+ *         y_i = y_is[i]
+ */
+  __pyx_t_1 = (__pyx_v_x_vals->dimensions[0]);
+  for (__pyx_t_2 = 0; __pyx_t_2 < __pyx_t_1; __pyx_t_2+=1) {
+    __pyx_v_i = __pyx_t_2;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":94
+ *     cdef int i, x_i, y_i, z_i
+ *     for i in range(x_vals.shape[0]):
+ *         x_i = x_is[i]             # <<<<<<<<<<<<<<
+ *         y_i = y_is[i]
+ *         z_i = z_is[i]
+ */
+    __pyx_t_3 = __pyx_v_i;
+    if (__pyx_t_3 < 0) __pyx_t_3 += __pyx_bshape_0_x_is;
+    __pyx_v_x_i = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int_t *, __pyx_bstruct_x_is.buf, __pyx_t_3, __pyx_bstride_0_x_is));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":95
+ *     for i in range(x_vals.shape[0]):
+ *         x_i = x_is[i]
+ *         y_i = y_is[i]             # <<<<<<<<<<<<<<
+ *         z_i = z_is[i]
+ *         x = x_vals[i]
+ */
+    __pyx_t_4 = __pyx_v_i;
+    if (__pyx_t_4 < 0) __pyx_t_4 += __pyx_bshape_0_y_is;
+    __pyx_v_y_i = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int_t *, __pyx_bstruct_y_is.buf, __pyx_t_4, __pyx_bstride_0_y_is));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":96
+ *         x_i = x_is[i]
+ *         y_i = y_is[i]
+ *         z_i = z_is[i]             # <<<<<<<<<<<<<<
+ *         x = x_vals[i]
+ *         y = y_vals[i]
+ */
+    __pyx_t_5 = __pyx_v_i;
+    if (__pyx_t_5 < 0) __pyx_t_5 += __pyx_bshape_0_z_is;
+    __pyx_v_z_i = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int_t *, __pyx_bstruct_z_is.buf, __pyx_t_5, __pyx_bstride_0_z_is));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":97
+ *         y_i = y_is[i]
+ *         z_i = z_is[i]
+ *         x = x_vals[i]             # <<<<<<<<<<<<<<
+ *         y = y_vals[i]
+ *         z = z_vals[i]
+ */
+    __pyx_t_6 = __pyx_v_i;
+    if (__pyx_t_6 < 0) __pyx_t_6 += __pyx_bshape_0_x_vals;
+    __pyx_v_x = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_x_vals.buf, __pyx_t_6, __pyx_bstride_0_x_vals));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":98
+ *         z_i = z_is[i]
+ *         x = x_vals[i]
+ *         y = y_vals[i]             # <<<<<<<<<<<<<<
+ *         z = z_vals[i]
+ *         dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
+ */
+    __pyx_t_7 = __pyx_v_i;
+    if (__pyx_t_7 < 0) __pyx_t_7 += __pyx_bshape_0_y_vals;
+    __pyx_v_y = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_y_vals.buf, __pyx_t_7, __pyx_bstride_0_y_vals));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":99
+ *         x = x_vals[i]
+ *         y = y_vals[i]
+ *         z = z_vals[i]             # <<<<<<<<<<<<<<
+ *         dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
+ *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
+ */
+    __pyx_t_8 = __pyx_v_i;
+    if (__pyx_t_8 < 0) __pyx_t_8 += __pyx_bshape_0_z_vals;
+    __pyx_v_z = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_z_vals.buf, __pyx_t_8, __pyx_bstride_0_z_vals));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":100
+ *         y = y_vals[i]
+ *         z = z_vals[i]
+ *         dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])             # <<<<<<<<<<<<<<
+ *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
+ *         dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])
+ */
+    __pyx_t_9 = (__pyx_v_x_i + 1);
+    if (__pyx_t_9 < 0) __pyx_t_9 += __pyx_bshape_0_x_bins;
+    __pyx_t_10 = __pyx_v_x_i;
+    if (__pyx_t_10 < 0) __pyx_t_10 += __pyx_bshape_0_x_bins;
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+    if (unlikely(__pyx_t_11 == 0)) {
+      PyErr_Format(PyExc_ZeroDivisionError, "float division");
+      {__pyx_filename = __pyx_f[3]; __pyx_lineno = 100; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    }
+    __pyx_v_dx_inv = (1.0 / __pyx_t_11);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":101
+ *         z = z_vals[i]
+ *         dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
+ *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])             # <<<<<<<<<<<<<<
+ *         dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])
+ *         xp = (x - x_bins[x_i]) * dx_inv
+ */
+    __pyx_t_12 = (__pyx_v_y_i + 1);
+    if (__pyx_t_12 < 0) __pyx_t_12 += __pyx_bshape_0_y_bins;
+    __pyx_t_13 = __pyx_v_y_i;
+    if (__pyx_t_13 < 0) __pyx_t_13 += __pyx_bshape_0_y_bins;
+    __pyx_t_11 = ((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_y_bins.buf, __pyx_t_12, __pyx_bstride_0_y_bins)) - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_y_bins.buf, __pyx_t_13, __pyx_bstride_0_y_bins)));
+    if (unlikely(__pyx_t_11 == 0)) {
+      PyErr_Format(PyExc_ZeroDivisionError, "float division");
+      {__pyx_filename = __pyx_f[3]; __pyx_lineno = 101; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    }
+    __pyx_v_dy_inv = (1.0 / __pyx_t_11);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":102
+ *         dx_inv = 1.0 / (x_bins[x_i+1] - x_bins[x_i])
+ *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
+ *         dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])             # <<<<<<<<<<<<<<
+ *         xp = (x - x_bins[x_i]) * dx_inv
+ *         yp = (y - y_bins[y_i]) * dy_inv
+ */
+    __pyx_t_14 = (__pyx_v_z_i + 1);
+    if (__pyx_t_14 < 0) __pyx_t_14 += __pyx_bshape_0_z_bins;
+    __pyx_t_15 = __pyx_v_z_i;
+    if (__pyx_t_15 < 0) __pyx_t_15 += __pyx_bshape_0_z_bins;
+    __pyx_t_11 = ((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_z_bins.buf, __pyx_t_14, __pyx_bstride_0_z_bins)) - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_z_bins.buf, __pyx_t_15, __pyx_bstride_0_z_bins)));
+    if (unlikely(__pyx_t_11 == 0)) {
+      PyErr_Format(PyExc_ZeroDivisionError, "float division");
+      {__pyx_filename = __pyx_f[3]; __pyx_lineno = 102; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    }
+    __pyx_v_dz_inv = (1.0 / __pyx_t_11);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":103
+ *         dy_inv = 1.0 / (y_bins[y_i+1] - y_bins[y_i])
+ *         dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])
+ *         xp = (x - x_bins[x_i]) * dx_inv             # <<<<<<<<<<<<<<
+ *         yp = (y - y_bins[y_i]) * dy_inv
+ *         zp = (z - z_bins[z_i]) * dz_inv
+ */
+    __pyx_t_16 = __pyx_v_x_i;
+    if (__pyx_t_16 < 0) __pyx_t_16 += __pyx_bshape_0_x_bins;
+    __pyx_v_xp = ((__pyx_v_x - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_x_bins.buf, __pyx_t_16, __pyx_bstride_0_x_bins))) * __pyx_v_dx_inv);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":104
+ *         dz_inv = 1.0 / (z_bins[z_i+1] - z_bins[z_i])
+ *         xp = (x - x_bins[x_i]) * dx_inv
+ *         yp = (y - y_bins[y_i]) * dy_inv             # <<<<<<<<<<<<<<
+ *         zp = (z - z_bins[z_i]) * dz_inv
+ *         xm = (x_bins[x_i+1] - x) * dx_inv
+ */
+    __pyx_t_17 = __pyx_v_y_i;
+    if (__pyx_t_17 < 0) __pyx_t_17 += __pyx_bshape_0_y_bins;
+    __pyx_v_yp = ((__pyx_v_y - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_y_bins.buf, __pyx_t_17, __pyx_bstride_0_y_bins))) * __pyx_v_dy_inv);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":105
+ *         xp = (x - x_bins[x_i]) * dx_inv
+ *         yp = (y - y_bins[y_i]) * dy_inv
+ *         zp = (z - z_bins[z_i]) * dz_inv             # <<<<<<<<<<<<<<
+ *         xm = (x_bins[x_i+1] - x) * dx_inv
+ *         ym = (y_bins[y_i+1] - y) * dy_inv
+ */
+    __pyx_t_18 = __pyx_v_z_i;
+    if (__pyx_t_18 < 0) __pyx_t_18 += __pyx_bshape_0_z_bins;
+    __pyx_v_zp = ((__pyx_v_z - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_z_bins.buf, __pyx_t_18, __pyx_bstride_0_z_bins))) * __pyx_v_dz_inv);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":106
+ *         yp = (y - y_bins[y_i]) * dy_inv
+ *         zp = (z - z_bins[z_i]) * dz_inv
+ *         xm = (x_bins[x_i+1] - x) * dx_inv             # <<<<<<<<<<<<<<
+ *         ym = (y_bins[y_i+1] - y) * dy_inv
+ *         zm = (z_bins[z_i+1] - z) * dz_inv
+ */
+    __pyx_t_19 = (__pyx_v_x_i + 1);
+    if (__pyx_t_19 < 0) __pyx_t_19 += __pyx_bshape_0_x_bins;
+    __pyx_v_xm = (((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_x_bins.buf, __pyx_t_19, __pyx_bstride_0_x_bins)) - __pyx_v_x) * __pyx_v_dx_inv);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":107
+ *         zp = (z - z_bins[z_i]) * dz_inv
+ *         xm = (x_bins[x_i+1] - x) * dx_inv
+ *         ym = (y_bins[y_i+1] - y) * dy_inv             # <<<<<<<<<<<<<<
+ *         zm = (z_bins[z_i+1] - z) * dz_inv
+ *         output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \
+ */
+    __pyx_t_20 = (__pyx_v_y_i + 1);
+    if (__pyx_t_20 < 0) __pyx_t_20 += __pyx_bshape_0_y_bins;
+    __pyx_v_ym = (((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_y_bins.buf, __pyx_t_20, __pyx_bstride_0_y_bins)) - __pyx_v_y) * __pyx_v_dy_inv);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":108
+ *         xm = (x_bins[x_i+1] - x) * dx_inv
+ *         ym = (y_bins[y_i+1] - y) * dy_inv
+ *         zm = (z_bins[z_i+1] - z) * dz_inv             # <<<<<<<<<<<<<<
+ *         output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \
+ *                    + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \
+ */
+    __pyx_t_21 = (__pyx_v_z_i + 1);
+    if (__pyx_t_21 < 0) __pyx_t_21 += __pyx_bshape_0_z_bins;
+    __pyx_v_zm = (((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_z_bins.buf, __pyx_t_21, __pyx_bstride_0_z_bins)) - __pyx_v_z) * __pyx_v_dz_inv);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":109
+ *         ym = (y_bins[y_i+1] - y) * dy_inv
+ *         zm = (z_bins[z_i+1] - z) * dz_inv
+ *         output[i]  = table[x_i  ,y_i  ,z_i  ] * (xm*ym*zm) \             # <<<<<<<<<<<<<<
+ *                    + table[x_i+1,y_i  ,z_i  ] * (xp*ym*zm) \
+ *                    + table[x_i  ,y_i+1,z_i  ] * (xm*yp*zm) \
+ */
+    __pyx_t_22 = __pyx_v_x_i;
+    __pyx_t_23 = __pyx_v_y_i;
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_grid_left_edge), __pyx_ptype_5numpy_ndarray, 1, "grid_left_edge", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 92; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_dds), __pyx_ptype_5numpy_ndarray, 1, "dds", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 94; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_mask), __pyx_ptype_5numpy_ndarray, 1, "mask", 0))) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 95; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+  __pyx_bstride_0_grid_left_edge = __pyx_bstruct_grid_left_edge.strides[0];
+  __pyx_bshape_0_grid_left_edge = __pyx_bstruct_grid_left_edge.shape[0];
+  {
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+  }
+  __pyx_bstride_0_grid_right_edge = __pyx_bstruct_grid_right_edge.strides[0];
+  __pyx_bshape_0_grid_right_edge = __pyx_bstruct_grid_right_edge.shape[0];
+  {
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+  }
+  __pyx_bstride_0_dds = __pyx_bstruct_dds.strides[0];
+  __pyx_bshape_0_dds = __pyx_bstruct_dds.shape[0];
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_mask, (PyObject*)__pyx_v_mask, &__Pyx_TypeInfo_nn___pyx_t_5numpy_int32_t, PyBUF_FORMAT| PyBUF_STRIDES| PyBUF_WRITABLE, 3, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 88; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_mask = __pyx_bstruct_mask.strides[0]; __pyx_bstride_1_mask = __pyx_bstruct_mask.strides[1]; __pyx_bstride_2_mask = __pyx_bstruct_mask.strides[2];
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+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":99
+ *     cdef int n[3], i, j, k, ax
+ *     cdef np.float64_t rds[3][3], cur_pos[3], rorigin[3]
+ *     for i in range(3):             # <<<<<<<<<<<<<<
+ *         rorigin[i] = 0.0
+ *     for i in range(3):
+ */
+  for (__pyx_t_1 = 0; __pyx_t_1 < 3; __pyx_t_1+=1) {
+    __pyx_v_i = __pyx_t_1;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":100
+ *     cdef np.float64_t rds[3][3], cur_pos[3], rorigin[3]
+ *     for i in range(3):
+ *         rorigin[i] = 0.0             # <<<<<<<<<<<<<<
+ *     for i in range(3):
+ *         n[i] = mask.shape[i]
+ */
+    (__pyx_v_rorigin[__pyx_v_i]) = 0.0;
+  }
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":101
+ *     for i in range(3):
+ *         rorigin[i] = 0.0
+ *     for i in range(3):             # <<<<<<<<<<<<<<
+ *         n[i] = mask.shape[i]
+ *         for j in range(3):
+ */
+  for (__pyx_t_1 = 0; __pyx_t_1 < 3; __pyx_t_1+=1) {
+    __pyx_v_i = __pyx_t_1;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":102
+ *         rorigin[i] = 0.0
+ *     for i in range(3):
+ *         n[i] = mask.shape[i]             # <<<<<<<<<<<<<<
+ *         for j in range(3):
+ *             # Set up our transposed dx, which has a component in every
+ */
+    (__pyx_v_n[__pyx_v_i]) = (__pyx_v_mask->dimensions[__pyx_v_i]);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":103
+ *     for i in range(3):
+ *         n[i] = mask.shape[i]
+ *         for j in range(3):             # <<<<<<<<<<<<<<
+ *             # Set up our transposed dx, which has a component in every
+ *             # direction
+ */
+    for (__pyx_t_2 = 0; __pyx_t_2 < 3; __pyx_t_2+=1) {
+      __pyx_v_j = __pyx_t_2;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":106
+ *             # Set up our transposed dx, which has a component in every
+ *             # direction
+ *             rds[i][j] = dds[i] * rot_mat[j,i]             # <<<<<<<<<<<<<<
+ *             # In our rotated coordinate system, the box origin is 0,0,0
+ *             # so we subtract the box_origin from the grid_origin and rotate
+ */
+      __pyx_t_3 = __pyx_v_i;
+      __pyx_t_4 = -1;
+      if (__pyx_t_3 < 0) {
+        __pyx_t_3 += __pyx_bshape_0_dds;
+        if (unlikely(__pyx_t_3 < 0)) __pyx_t_4 = 0;
+      } else if (unlikely(__pyx_t_3 >= __pyx_bshape_0_dds)) __pyx_t_4 = 0;
+      if (unlikely(__pyx_t_4 != -1)) {
+        __Pyx_RaiseBufferIndexError(__pyx_t_4);
+        {__pyx_filename = __pyx_f[1]; __pyx_lineno = 106; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      }
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+      __pyx_t_5 = __pyx_v_i;
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+      if (__pyx_t_4 < 0) {
+        __pyx_t_4 += __pyx_bshape_0_rot_mat;
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+        __pyx_t_5 += __pyx_bshape_1_rot_mat;
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+      if (unlikely(__pyx_t_6 != -1)) {
+        __Pyx_RaiseBufferIndexError(__pyx_t_6);
+        {__pyx_filename = __pyx_f[1]; __pyx_lineno = 106; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
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+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":110
+ *             # so we subtract the box_origin from the grid_origin and rotate
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+ *             rorigin[j] += (grid_left_edge[i] - box_origin[i]) * rot_mat[j,i]             # <<<<<<<<<<<<<<
+ * 
+ *     for i in range(n[0]):
+ */
+      __pyx_t_6 = __pyx_v_i;
+      __pyx_t_7 = -1;
+      if (__pyx_t_6 < 0) {
+        __pyx_t_6 += __pyx_bshape_0_grid_left_edge;
+        if (unlikely(__pyx_t_6 < 0)) __pyx_t_7 = 0;
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+      if (unlikely(__pyx_t_7 != -1)) {
+        __Pyx_RaiseBufferIndexError(__pyx_t_7);
+        {__pyx_filename = __pyx_f[1]; __pyx_lineno = 110; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      }
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+      } else if (unlikely(__pyx_t_7 >= __pyx_bshape_0_box_origin)) __pyx_t_8 = 0;
+      if (unlikely(__pyx_t_8 != -1)) {
+        __Pyx_RaiseBufferIndexError(__pyx_t_8);
+        {__pyx_filename = __pyx_f[1]; __pyx_lineno = 110; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      }
+      __pyx_t_8 = __pyx_v_j;
+      __pyx_t_9 = __pyx_v_i;
+      __pyx_t_10 = -1;
+      if (__pyx_t_8 < 0) {
+        __pyx_t_8 += __pyx_bshape_0_rot_mat;
+        if (unlikely(__pyx_t_8 < 0)) __pyx_t_10 = 0;
+      } else if (unlikely(__pyx_t_8 >= __pyx_bshape_0_rot_mat)) __pyx_t_10 = 0;
+      if (__pyx_t_9 < 0) {
+        __pyx_t_9 += __pyx_bshape_1_rot_mat;
+        if (unlikely(__pyx_t_9 < 0)) __pyx_t_10 = 1;
+      } else if (unlikely(__pyx_t_9 >= __pyx_bshape_1_rot_mat)) __pyx_t_10 = 1;
+      if (unlikely(__pyx_t_10 != -1)) {
+        __Pyx_RaiseBufferIndexError(__pyx_t_10);
+        {__pyx_filename = __pyx_f[1]; __pyx_lineno = 110; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      }
+      (__pyx_v_rorigin[__pyx_v_j]) += (((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_grid_left_edge.buf, __pyx_t_6, __pyx_bstride_0_grid_left_edge)) - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_box_origin.buf, __pyx_t_7, __pyx_bstride_0_box_origin))) * (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_rot_mat.buf, __pyx_t_8, __pyx_bstride_0_rot_mat, __pyx_t_9, __pyx_bstride_1_rot_mat)));
+    }
+  }
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":112
+ *             rorigin[j] += (grid_left_edge[i] - box_origin[i]) * rot_mat[j,i]
+ * 
+ *     for i in range(n[0]):             # <<<<<<<<<<<<<<
+ *         for j in range(n[1]):
+ *             for k in range(n[2]):
+ */
+  __pyx_t_1 = (__pyx_v_n[0]);
+  for (__pyx_t_2 = 0; __pyx_t_2 < __pyx_t_1; __pyx_t_2+=1) {
+    __pyx_v_i = __pyx_t_2;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":113
+ * 
+ *     for i in range(n[0]):
+ *         for j in range(n[1]):             # <<<<<<<<<<<<<<
+ *             for k in range(n[2]):
+ *                 set_rotated_pos(cur_pos, rds, rorigin, i, j, k)
+ */
+    __pyx_t_10 = (__pyx_v_n[1]);
+    for (__pyx_t_11 = 0; __pyx_t_11 < __pyx_t_10; __pyx_t_11+=1) {
+      __pyx_v_j = __pyx_t_11;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":114
+ *     for i in range(n[0]):
+ *         for j in range(n[1]):
+ *             for k in range(n[2]):             # <<<<<<<<<<<<<<
+ *                 set_rotated_pos(cur_pos, rds, rorigin, i, j, k)
+ *                 if (cur_pos[0] > box_lengths[0]): continue
+ */
+      __pyx_t_12 = (__pyx_v_n[2]);
+      for (__pyx_t_13 = 0; __pyx_t_13 < __pyx_t_12; __pyx_t_13+=1) {
+        __pyx_v_k = __pyx_t_13;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":115
+ *         for j in range(n[1]):
+ *             for k in range(n[2]):
+ *                 set_rotated_pos(cur_pos, rds, rorigin, i, j, k)             # <<<<<<<<<<<<<<
+ *                 if (cur_pos[0] > box_lengths[0]): continue
+ *                 if (cur_pos[1] > box_lengths[1]): continue
+ */
+        __pyx_f_2yt_9amr_utils_set_rotated_pos(__pyx_v_cur_pos, __pyx_v_rds, __pyx_v_rorigin, __pyx_v_i, __pyx_v_j, __pyx_v_k);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":116
+ *             for k in range(n[2]):
+ *                 set_rotated_pos(cur_pos, rds, rorigin, i, j, k)
+ *                 if (cur_pos[0] > box_lengths[0]): continue             # <<<<<<<<<<<<<<
+ *                 if (cur_pos[1] > box_lengths[1]): continue
+ *                 if (cur_pos[2] > box_lengths[2]): continue
+ */
+        __pyx_t_14 = 0;
+        __pyx_t_15 = -1;
+        if (__pyx_t_14 < 0) {
+          __pyx_t_14 += __pyx_bshape_0_box_lengths;
+          if (unlikely(__pyx_t_14 < 0)) __pyx_t_15 = 0;
+        } else if (unlikely(__pyx_t_14 >= __pyx_bshape_0_box_lengths)) __pyx_t_15 = 0;
+        if (unlikely(__pyx_t_15 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_15);
+          {__pyx_filename = __pyx_f[1]; __pyx_lineno = 116; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        __pyx_t_16 = ((__pyx_v_cur_pos[0]) > (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_box_lengths.buf, __pyx_t_14, __pyx_bstride_0_box_lengths)));
+        if (__pyx_t_16) {
+          goto __pyx_L16_continue;
+          goto __pyx_L18;
+        }
+        __pyx_L18:;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":117
+ *                 set_rotated_pos(cur_pos, rds, rorigin, i, j, k)
+ *                 if (cur_pos[0] > box_lengths[0]): continue
+ *                 if (cur_pos[1] > box_lengths[1]): continue             # <<<<<<<<<<<<<<
+ *                 if (cur_pos[2] > box_lengths[2]): continue
+ *                 if (cur_pos[0] < 0.0): continue
+ */
+        __pyx_t_17 = 1;
+        __pyx_t_15 = -1;
+        if (__pyx_t_17 < 0) {
+          __pyx_t_17 += __pyx_bshape_0_box_lengths;
+          if (unlikely(__pyx_t_17 < 0)) __pyx_t_15 = 0;
+        } else if (unlikely(__pyx_t_17 >= __pyx_bshape_0_box_lengths)) __pyx_t_15 = 0;
+        if (unlikely(__pyx_t_15 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_15);
+          {__pyx_filename = __pyx_f[1]; __pyx_lineno = 117; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        __pyx_t_16 = ((__pyx_v_cur_pos[1]) > (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_box_lengths.buf, __pyx_t_17, __pyx_bstride_0_box_lengths)));
+        if (__pyx_t_16) {
+          goto __pyx_L16_continue;
+          goto __pyx_L19;
+        }
+        __pyx_L19:;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":118
+ *                 if (cur_pos[0] > box_lengths[0]): continue
+ *                 if (cur_pos[1] > box_lengths[1]): continue
+ *                 if (cur_pos[2] > box_lengths[2]): continue             # <<<<<<<<<<<<<<
+ *                 if (cur_pos[0] < 0.0): continue
+ *                 if (cur_pos[1] < 0.0): continue
+ */
+        __pyx_t_18 = 2;
+        __pyx_t_15 = -1;
+        if (__pyx_t_18 < 0) {
+          __pyx_t_18 += __pyx_bshape_0_box_lengths;
+          if (unlikely(__pyx_t_18 < 0)) __pyx_t_15 = 0;
+        } else if (unlikely(__pyx_t_18 >= __pyx_bshape_0_box_lengths)) __pyx_t_15 = 0;
+        if (unlikely(__pyx_t_15 != -1)) {
+          __Pyx_RaiseBufferIndexError(__pyx_t_15);
+          {__pyx_filename = __pyx_f[1]; __pyx_lineno = 118; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+        }
+        __pyx_t_16 = ((__pyx_v_cur_pos[2]) > (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_box_lengths.buf, __pyx_t_18, __pyx_bstride_0_box_lengths)));
+        if (__pyx_t_16) {
+          goto __pyx_L16_continue;
+          goto __pyx_L20;
+        }
+        __pyx_L20:;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":119
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+ *             tga += g_vec[g_ax][b_ax] * sep_vec[b_ax]
+ *         ba += fabs(tba)             # <<<<<<<<<<<<<<
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+ */
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+  __pyx_t_8 = 0;
+  __Pyx_DECREF(((PyObject *)__pyx_v_grid_centers));
+  __pyx_v_grid_centers = ((PyArrayObject *)__pyx_t_3);
+  __pyx_t_3 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":188
+ *     # Now we pre-compute our candidate separating axes, because the unit
+ *     # vectors for all the grids are identical
+ *     for b_ax in range(3):             # <<<<<<<<<<<<<<
+ *         # We have 6 principal axes we already know, which are the grid (domain)
+ *         # principal axes and the box axes
+ */
+  for (__pyx_t_6 = 0; __pyx_t_6 < 3; __pyx_t_6+=1) {
+    __pyx_v_b_ax = __pyx_t_6;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":191
+ *         # We have 6 principal axes we already know, which are the grid (domain)
+ *         # principal axes and the box axes
+ *         sep_ax[b_ax][0] = sep_ax[b_ax][1] = sep_ax[b_ax][2] = 0.0             # <<<<<<<<<<<<<<
+ *         sep_ax[b_ax][b_ax] = 1.0 # delta_ijk, for grid axes
+ *         for g_ax in range(3):
+ */
+    ((__pyx_v_sep_ax[__pyx_v_b_ax])[0]) = 0.0;
+    ((__pyx_v_sep_ax[__pyx_v_b_ax])[1]) = 0.0;
+    ((__pyx_v_sep_ax[__pyx_v_b_ax])[2]) = 0.0;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":192
+ *         # principal axes and the box axes
+ *         sep_ax[b_ax][0] = sep_ax[b_ax][1] = sep_ax[b_ax][2] = 0.0
+ *         sep_ax[b_ax][b_ax] = 1.0 # delta_ijk, for grid axes             # <<<<<<<<<<<<<<
+ *         for g_ax in range(3):
+ *             b_vec[b_ax][g_ax] = 0.5*box_vectors[b_ax,g_ax]
+ */
+    ((__pyx_v_sep_ax[__pyx_v_b_ax])[__pyx_v_b_ax]) = 1.0;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":193
+ *         sep_ax[b_ax][0] = sep_ax[b_ax][1] = sep_ax[b_ax][2] = 0.0
+ *         sep_ax[b_ax][b_ax] = 1.0 # delta_ijk, for grid axes
+ *         for g_ax in range(3):             # <<<<<<<<<<<<<<
+ *             b_vec[b_ax][g_ax] = 0.5*box_vectors[b_ax,g_ax]
+ *             sep_ax[b_ax + 3][g_ax] = b_vec[b_ax][g_ax] # box axes
+ */
+    for (__pyx_t_7 = 0; __pyx_t_7 < 3; __pyx_t_7+=1) {
+      __pyx_v_g_ax = __pyx_t_7;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":194
+ *         sep_ax[b_ax][b_ax] = 1.0 # delta_ijk, for grid axes
+ *         for g_ax in range(3):
+ *             b_vec[b_ax][g_ax] = 0.5*box_vectors[b_ax,g_ax]             # <<<<<<<<<<<<<<
+ *             sep_ax[b_ax + 3][g_ax] = b_vec[b_ax][g_ax] # box axes
+ *         normalize_vector(sep_ax[b_ax + 3])
+ */
+      __pyx_t_12 = __pyx_v_b_ax;
+      __pyx_t_13 = __pyx_v_g_ax;
+      ((__pyx_v_b_vec[__pyx_v_b_ax])[__pyx_v_g_ax]) = (0.5 * (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_box_vectors.buf, __pyx_t_12, __pyx_bstride_0_box_vectors, __pyx_t_13, __pyx_bstride_1_box_vectors)));
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":195
+ *         for g_ax in range(3):
+ *             b_vec[b_ax][g_ax] = 0.5*box_vectors[b_ax,g_ax]
+ *             sep_ax[b_ax + 3][g_ax] = b_vec[b_ax][g_ax] # box axes             # <<<<<<<<<<<<<<
+ *         normalize_vector(sep_ax[b_ax + 3])
+ *         for g_ax in range(3):
+ */
+      ((__pyx_v_sep_ax[(__pyx_v_b_ax + 3)])[__pyx_v_g_ax]) = ((__pyx_v_b_vec[__pyx_v_b_ax])[__pyx_v_g_ax]);
+    }
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":196
+ *             b_vec[b_ax][g_ax] = 0.5*box_vectors[b_ax,g_ax]
+ *             sep_ax[b_ax + 3][g_ax] = b_vec[b_ax][g_ax] # box axes
+ *         normalize_vector(sep_ax[b_ax + 3])             # <<<<<<<<<<<<<<
+ *         for g_ax in range(3):
+ *             get_cross_product(b_vec[b_ax], a_vec[g_ax], sep_ax[b_ax*3 + g_ax + 6])
+ */
+    __pyx_f_2yt_9amr_utils_normalize_vector((__pyx_v_sep_ax[(__pyx_v_b_ax + 3)]));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":197
+ *             sep_ax[b_ax + 3][g_ax] = b_vec[b_ax][g_ax] # box axes
+ *         normalize_vector(sep_ax[b_ax + 3])
+ *         for g_ax in range(3):             # <<<<<<<<<<<<<<
+ *             get_cross_product(b_vec[b_ax], a_vec[g_ax], sep_ax[b_ax*3 + g_ax + 6])
+ *             normalize_vector(sep_ax[b_ax*3 + g_ax + 6])
+ */
+    for (__pyx_t_7 = 0; __pyx_t_7 < 3; __pyx_t_7+=1) {
+      __pyx_v_g_ax = __pyx_t_7;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":198
+ *         normalize_vector(sep_ax[b_ax + 3])
+ *         for g_ax in range(3):
+ *             get_cross_product(b_vec[b_ax], a_vec[g_ax], sep_ax[b_ax*3 + g_ax + 6])             # <<<<<<<<<<<<<<
+ *             normalize_vector(sep_ax[b_ax*3 + g_ax + 6])
+ * 
+ */
+      __pyx_f_2yt_9amr_utils_get_cross_product((__pyx_v_b_vec[__pyx_v_b_ax]), (__pyx_v_a_vec[__pyx_v_g_ax]), (__pyx_v_sep_ax[(((__pyx_v_b_ax * 3) + __pyx_v_g_ax) + 6)]));
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":199
+ *         for g_ax in range(3):
+ *             get_cross_product(b_vec[b_ax], a_vec[g_ax], sep_ax[b_ax*3 + g_ax + 6])
+ *             normalize_vector(sep_ax[b_ax*3 + g_ax + 6])             # <<<<<<<<<<<<<<
+ * 
+ *     for gi in range(n):
+ */
+      __pyx_f_2yt_9amr_utils_normalize_vector((__pyx_v_sep_ax[(((__pyx_v_b_ax * 3) + __pyx_v_g_ax) + 6)]));
+    }
+  }
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":201
+ *             normalize_vector(sep_ax[b_ax*3 + g_ax + 6])
+ * 
+ *     for gi in range(n):             # <<<<<<<<<<<<<<
+ *         for g_ax in range(3):
+ *             # Calculate the separation vector
+ */
+  __pyx_t_6 = __pyx_v_n;
+  for (__pyx_t_7 = 0; __pyx_t_7 < __pyx_t_6; __pyx_t_7+=1) {
+    __pyx_v_gi = __pyx_t_7;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":202
+ * 
+ *     for gi in range(n):
+ *         for g_ax in range(3):             # <<<<<<<<<<<<<<
+ *             # Calculate the separation vector
+ *             sep_vec[g_ax] = grid_centers[gi, g_ax] - box_center[g_ax]
+ */
+    for (__pyx_t_14 = 0; __pyx_t_14 < 3; __pyx_t_14+=1) {
+      __pyx_v_g_ax = __pyx_t_14;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":204
+ *         for g_ax in range(3):
+ *             # Calculate the separation vector
+ *             sep_vec[g_ax] = grid_centers[gi, g_ax] - box_center[g_ax]             # <<<<<<<<<<<<<<
+ *             # Calculate the grid axis lengths
+ *             g_vec[g_ax][0] = g_vec[g_ax][1] = g_vec[g_ax][2] = 0.0
+ */
+      __pyx_t_15 = __pyx_v_gi;
+      __pyx_t_16 = __pyx_v_g_ax;
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+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":206
+ *             sep_vec[g_ax] = grid_centers[gi, g_ax] - box_center[g_ax]
+ *             # Calculate the grid axis lengths
+ *             g_vec[g_ax][0] = g_vec[g_ax][1] = g_vec[g_ax][2] = 0.0             # <<<<<<<<<<<<<<
+ *             g_vec[g_ax][g_ax] = 0.5 * (grid_right_edges[gi, g_ax]
+ *                                      - grid_left_edges[gi, g_ax])
+ */
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+      ((__pyx_v_g_vec[__pyx_v_g_ax])[1]) = 0.0;
+      ((__pyx_v_g_vec[__pyx_v_g_ax])[2]) = 0.0;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":207
+ *             # Calculate the grid axis lengths
+ *             g_vec[g_ax][0] = g_vec[g_ax][1] = g_vec[g_ax][2] = 0.0
+ *             g_vec[g_ax][g_ax] = 0.5 * (grid_right_edges[gi, g_ax]             # <<<<<<<<<<<<<<
+ *                                      - grid_left_edges[gi, g_ax])
+ *         for b_ax in range(15):
+ */
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+      __pyx_t_19 = __pyx_v_g_ax;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":208
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+ *             g_vec[g_ax][g_ax] = 0.5 * (grid_right_edges[gi, g_ax]
+ *                                      - grid_left_edges[gi, g_ax])             # <<<<<<<<<<<<<<
+ *         for b_ax in range(15):
+ *             #print b_ax,
+ */
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+      __pyx_t_21 = __pyx_v_g_ax;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":207
+ *             # Calculate the grid axis lengths
+ *             g_vec[g_ax][0] = g_vec[g_ax][1] = g_vec[g_ax][2] = 0.0
+ *             g_vec[g_ax][g_ax] = 0.5 * (grid_right_edges[gi, g_ax]             # <<<<<<<<<<<<<<
+ *                                      - grid_left_edges[gi, g_ax])
+ *         for b_ax in range(15):
+ */
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+    }
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":209
+ *             g_vec[g_ax][g_ax] = 0.5 * (grid_right_edges[gi, g_ax]
+ *                                      - grid_left_edges[gi, g_ax])
+ *         for b_ax in range(15):             # <<<<<<<<<<<<<<
+ *             #print b_ax,
+ *             if check_projected_overlap(
+ */
+    for (__pyx_t_14 = 0; __pyx_t_14 < 15; __pyx_t_14+=1) {
+      __pyx_v_b_ax = __pyx_t_14;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":213
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+ *                         sep_ax[b_ax], sep_vec, gi,
+ *                         b_vec,  g_vec):             # <<<<<<<<<<<<<<
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+ *                 break
+ */
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+      if (__pyx_t_22) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":214
+ *                         sep_ax[b_ax], sep_vec, gi,
+ *                         b_vec,  g_vec):
+ *                 good[gi] = 1             # <<<<<<<<<<<<<<
+ *                 break
+ *     return good
+ */
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+        *__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int32_t *, __pyx_bstruct_good.buf, __pyx_t_22, __pyx_bstride_0_good) = 1;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":215
+ *                         b_vec,  g_vec):
+ *                 good[gi] = 1
+ *                 break             # <<<<<<<<<<<<<<
+ *     return good
+ * 
+ */
+        goto __pyx_L21_break;
+        goto __pyx_L22;
+      }
+      __pyx_L22:;
+    }
+    __pyx_L21_break:;
+  }
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":216
+ *                 good[gi] = 1
+ *                 break
+ *     return good             # <<<<<<<<<<<<<<
+ * 
+ */
+  __Pyx_XDECREF(__pyx_r);
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+}
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":36
+ * 
+ * @cython.boundscheck(False)
+ * def Transfer3D(np.ndarray[np.float64_t, ndim=3] i_s,             # <<<<<<<<<<<<<<
+ *                np.ndarray[np.float64_t, ndim=4] o_s,
+ *                np.ndarray[np.float64_t, ndim=4] e,
+ */
+
+static PyObject *__pyx_pf_2yt_9amr_utils_Transfer3D(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
+static char __pyx_doc_2yt_9amr_utils_Transfer3D[] = "\n    This function accepts an incoming slab (*i_s*), a buffer\n    for an outgoing set of values at every point in the grid (*o_s*),\n    an emission array (*e*), an absorption array (*a*), and dimensions of\n    the grid (*imin*, *imax*, *jmin*, *jmax*, *kmin*, *kmax*) as well\n    as strides in the *i* and *j* directions, and a *dx* of the grid being\n    integrated.\n    ";
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+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_shells, (PyObject*)__pyx_v_shells, &__Pyx_TypeInfo_nn___pyx_t_5numpy_float64_t, PyBUF_FORMAT| PyBUF_STRIDES, 2, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 74; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_shells = __pyx_bstruct_shells.strides[0]; __pyx_bstride_1_shells = __pyx_bstruct_shells.strides[1];
+  __pyx_bshape_0_shells = __pyx_bstruct_shells.shape[0]; __pyx_bshape_1_shells = __pyx_bstruct_shells.shape[1];
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":86
+ *     cdef int n, nn
+ *     cdef np.float64_t dist
+ *     ii = data.shape[0]             # <<<<<<<<<<<<<<
+ *     jj = data.shape[1]
+ *     kk = data.shape[2]
+ */
+  __pyx_v_ii = (__pyx_v_data->dimensions[0]);
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":87
+ *     cdef np.float64_t dist
+ *     ii = data.shape[0]
+ *     jj = data.shape[1]             # <<<<<<<<<<<<<<
+ *     kk = data.shape[2]
+ *     nn = shells.shape[0]
+ */
+  __pyx_v_jj = (__pyx_v_data->dimensions[1]);
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":88
+ *     ii = data.shape[0]
+ *     jj = data.shape[1]
+ *     kk = data.shape[2]             # <<<<<<<<<<<<<<
+ *     nn = shells.shape[0]
+ *     cdef float rgba[4]
+ */
+  __pyx_v_kk = (__pyx_v_data->dimensions[2]);
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":89
+ *     jj = data.shape[1]
+ *     kk = data.shape[2]
+ *     nn = shells.shape[0]             # <<<<<<<<<<<<<<
+ *     cdef float rgba[4]
+ *     cdef float alpha
+ */
+  __pyx_v_nn = (__pyx_v_shells->dimensions[0]);
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":92
+ *     cdef float rgba[4]
+ *     cdef float alpha
+ *     for i in range(ii):             # <<<<<<<<<<<<<<
+ *         for j in range(jj):
+ *             # Not sure about the ordering of the loops here
+ */
+  __pyx_t_1 = __pyx_v_ii;
+  for (__pyx_t_2 = 0; __pyx_t_2 < __pyx_t_1; __pyx_t_2+=1) {
+    __pyx_v_i = __pyx_t_2;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":93
+ *     cdef float alpha
+ *     for i in range(ii):
+ *         for j in range(jj):             # <<<<<<<<<<<<<<
+ *             # Not sure about the ordering of the loops here
+ *             for k in range(kk):
+ */
+    __pyx_t_3 = __pyx_v_jj;
+    for (__pyx_t_4 = 0; __pyx_t_4 < __pyx_t_3; __pyx_t_4+=1) {
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+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":95
+ *         for j in range(jj):
+ *             # Not sure about the ordering of the loops here
+ *             for k in range(kk):             # <<<<<<<<<<<<<<
+ *                 for n in range(nn):
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+ */
+      __pyx_t_5 = __pyx_v_kk;
+      for (__pyx_t_6 = 0; __pyx_t_6 < __pyx_t_5; __pyx_t_6+=1) {
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+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":96
+ *             # Not sure about the ordering of the loops here
+ *             for k in range(kk):
+ *                 for n in range(nn):             # <<<<<<<<<<<<<<
+ *                     dist = shells[n, 0] - data[i,j,k]
+ *                     if dist < 0: dist *= -1.0
+ */
+        __pyx_t_7 = __pyx_v_nn;
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+          __pyx_v_n = __pyx_t_8;
+
+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":97
+ *             for k in range(kk):
+ *                 for n in range(nn):
+ *                     dist = shells[n, 0] - data[i,j,k]             # <<<<<<<<<<<<<<
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+ */
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+
+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":98
+ *                 for n in range(nn):
+ *                     dist = shells[n, 0] - data[i,j,k]
+ *                     if dist < 0: dist *= -1.0             # <<<<<<<<<<<<<<
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+ */
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+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":99
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+ *                     if dist < 0: dist *= -1.0
+ *                     if dist < shells[n,1]:             # <<<<<<<<<<<<<<
+ *                         dist = exp(-dist/8.0)
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+ */
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+          __pyx_t_16 = 1;
+          if (__pyx_t_15 < 0) __pyx_t_15 += __pyx_bshape_0_shells;
+          if (__pyx_t_16 < 0) __pyx_t_16 += __pyx_bshape_1_shells;
+          __pyx_t_14 = (__pyx_v_dist < (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_15, __pyx_bstride_0_shells, __pyx_t_16, __pyx_bstride_1_shells)));
+          if (__pyx_t_14) {
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":100
+ *                     if dist < 0: dist *= -1.0
+ *                     if dist < shells[n,1]:
+ *                         dist = exp(-dist/8.0)             # <<<<<<<<<<<<<<
+ *                         rgba[0] = shells[n,2]
+ *                         rgba[1] = shells[n,3]
+ */
+            __pyx_v_dist = exp(((-__pyx_v_dist) / 8.0));
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+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":101
+ *                     if dist < shells[n,1]:
+ *                         dist = exp(-dist/8.0)
+ *                         rgba[0] = shells[n,2]             # <<<<<<<<<<<<<<
+ *                         rgba[1] = shells[n,3]
+ *                         rgba[2] = shells[n,4]
+ */
+            __pyx_t_17 = __pyx_v_n;
+            __pyx_t_18 = 2;
+            if (__pyx_t_17 < 0) __pyx_t_17 += __pyx_bshape_0_shells;
+            if (__pyx_t_18 < 0) __pyx_t_18 += __pyx_bshape_1_shells;
+            (__pyx_v_rgba[0]) = (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_17, __pyx_bstride_0_shells, __pyx_t_18, __pyx_bstride_1_shells));
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":102
+ *                         dist = exp(-dist/8.0)
+ *                         rgba[0] = shells[n,2]
+ *                         rgba[1] = shells[n,3]             # <<<<<<<<<<<<<<
+ *                         rgba[2] = shells[n,4]
+ *                         rgba[3] = shells[n,5]
+ */
+            __pyx_t_19 = __pyx_v_n;
+            __pyx_t_20 = 3;
+            if (__pyx_t_19 < 0) __pyx_t_19 += __pyx_bshape_0_shells;
+            if (__pyx_t_20 < 0) __pyx_t_20 += __pyx_bshape_1_shells;
+            (__pyx_v_rgba[1]) = (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_19, __pyx_bstride_0_shells, __pyx_t_20, __pyx_bstride_1_shells));
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":103
+ *                         rgba[0] = shells[n,2]
+ *                         rgba[1] = shells[n,3]
+ *                         rgba[2] = shells[n,4]             # <<<<<<<<<<<<<<
+ *                         rgba[3] = shells[n,5]
+ *                         alpha = i_s[i,j,3]
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+            __pyx_t_22 = 4;
+            if (__pyx_t_21 < 0) __pyx_t_21 += __pyx_bshape_0_shells;
+            if (__pyx_t_22 < 0) __pyx_t_22 += __pyx_bshape_1_shells;
+            (__pyx_v_rgba[2]) = (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_21, __pyx_bstride_0_shells, __pyx_t_22, __pyx_bstride_1_shells));
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":104
+ *                         rgba[1] = shells[n,3]
+ *                         rgba[2] = shells[n,4]
+ *                         rgba[3] = shells[n,5]             # <<<<<<<<<<<<<<
+ *                         alpha = i_s[i,j,3]
+ *                         dist *= dist # This might improve appearance
+ */
+            __pyx_t_23 = __pyx_v_n;
+            __pyx_t_24 = 5;
+            if (__pyx_t_23 < 0) __pyx_t_23 += __pyx_bshape_0_shells;
+            if (__pyx_t_24 < 0) __pyx_t_24 += __pyx_bshape_1_shells;
+            (__pyx_v_rgba[3]) = (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_23, __pyx_bstride_0_shells, __pyx_t_24, __pyx_bstride_1_shells));
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":105
+ *                         rgba[2] = shells[n,4]
+ *                         rgba[3] = shells[n,5]
+ *                         alpha = i_s[i,j,3]             # <<<<<<<<<<<<<<
+ *                         dist *= dist # This might improve appearance
+ *                         i_s[i,j,0] += (1.0 - alpha)*rgba[0]*dist*rgba[3]
+ */
+            __pyx_t_25 = __pyx_v_i;
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+            __pyx_v_alpha = (*__Pyx_BufPtrStrided3d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_i_s.buf, __pyx_t_25, __pyx_bstride_0_i_s, __pyx_t_26, __pyx_bstride_1_i_s, __pyx_t_27, __pyx_bstride_2_i_s));
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":106
+ *                         rgba[3] = shells[n,5]
+ *                         alpha = i_s[i,j,3]
+ *                         dist *= dist # This might improve appearance             # <<<<<<<<<<<<<<
+ *                         i_s[i,j,0] += (1.0 - alpha)*rgba[0]*dist*rgba[3]
+ *                         i_s[i,j,1] += (1.0 - alpha)*rgba[1]*dist*rgba[3]
+ */
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+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":107
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+ *                         dist *= dist # This might improve appearance
+ *                         i_s[i,j,0] += (1.0 - alpha)*rgba[0]*dist*rgba[3]             # <<<<<<<<<<<<<<
+ *                         i_s[i,j,1] += (1.0 - alpha)*rgba[1]*dist*rgba[3]
+ *                         i_s[i,j,2] += (1.0 - alpha)*rgba[2]*dist*rgba[3]
+ */
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+            __pyx_t_29 = __pyx_v_j;
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+            if (__pyx_t_29 < 0) __pyx_t_29 += __pyx_bshape_1_i_s;
+            if (__pyx_t_30 < 0) __pyx_t_30 += __pyx_bshape_2_i_s;
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+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":108
+ *                         dist *= dist # This might improve appearance
+ *                         i_s[i,j,0] += (1.0 - alpha)*rgba[0]*dist*rgba[3]
+ *                         i_s[i,j,1] += (1.0 - alpha)*rgba[1]*dist*rgba[3]             # <<<<<<<<<<<<<<
+ *                         i_s[i,j,2] += (1.0 - alpha)*rgba[2]*dist*rgba[3]
+ *                         i_s[i,j,3] += (1.0 - alpha)*rgba[3]*dist*rgba[3]
+ */
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+            __pyx_t_32 = __pyx_v_j;
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+            if (__pyx_t_31 < 0) __pyx_t_31 += __pyx_bshape_0_i_s;
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+            *__Pyx_BufPtrStrided3d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_i_s.buf, __pyx_t_31, __pyx_bstride_0_i_s, __pyx_t_32, __pyx_bstride_1_i_s, __pyx_t_33, __pyx_bstride_2_i_s) += ((((1.0 - __pyx_v_alpha) * (__pyx_v_rgba[1])) * __pyx_v_dist) * (__pyx_v_rgba[3]));
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":109
+ *                         i_s[i,j,0] += (1.0 - alpha)*rgba[0]*dist*rgba[3]
+ *                         i_s[i,j,1] += (1.0 - alpha)*rgba[1]*dist*rgba[3]
+ *                         i_s[i,j,2] += (1.0 - alpha)*rgba[2]*dist*rgba[3]             # <<<<<<<<<<<<<<
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+ *                         break
+ */
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+
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+ *                         i_s[i,j,1] += (1.0 - alpha)*rgba[1]*dist*rgba[3]
+ *                         i_s[i,j,2] += (1.0 - alpha)*rgba[2]*dist*rgba[3]
+ *                         i_s[i,j,3] += (1.0 - alpha)*rgba[3]*dist*rgba[3]             # <<<<<<<<<<<<<<
+ *                         break
+ * 
+ */
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+            __pyx_t_38 = __pyx_v_j;
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+            if (__pyx_t_38 < 0) __pyx_t_38 += __pyx_bshape_1_i_s;
+            if (__pyx_t_39 < 0) __pyx_t_39 += __pyx_bshape_2_i_s;
+            *__Pyx_BufPtrStrided3d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_i_s.buf, __pyx_t_37, __pyx_bstride_0_i_s, __pyx_t_38, __pyx_bstride_1_i_s, __pyx_t_39, __pyx_bstride_2_i_s) += ((((1.0 - __pyx_v_alpha) * (__pyx_v_rgba[3])) * __pyx_v_dist) * (__pyx_v_rgba[3]));
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+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":111
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+ *                         i_s[i,j,3] += (1.0 - alpha)*rgba[3]*dist*rgba[3]
+ *                         break             # <<<<<<<<<<<<<<
+ * 
+ * @cython.boundscheck(False)
+ */
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+}
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+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":114
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+ * def Transfer1D(float i_s,             # <<<<<<<<<<<<<<
+ *                np.ndarray[np.float_t, ndim=1] o_s,
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+ */
+
+static PyObject *__pyx_pf_2yt_9amr_utils_Transfer1D(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
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+  PyObject *__pyx_r = NULL;
+  int __pyx_t_1;
+  int __pyx_t_2;
+  int __pyx_t_3;
+  int __pyx_t_4;
+  int __pyx_t_5;
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+  __pyx_t_5numpy_int64_t __pyx_t_96;
+  __pyx_t_5numpy_int64_t __pyx_t_97;
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+  long __pyx_t_100;
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+  __pyx_t_5numpy_int64_t __pyx_t_104;
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+  __pyx_t_5numpy_int64_t __pyx_t_114;
+  __pyx_t_5numpy_int64_t __pyx_t_115;
+  __pyx_t_5numpy_int64_t __pyx_t_116;
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+  long __pyx_t_118;
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+  long __pyx_t_120;
+  __pyx_t_5numpy_int64_t __pyx_t_121;
+  __pyx_t_5numpy_int64_t __pyx_t_122;
+  __pyx_t_5numpy_int64_t __pyx_t_123;
+  long __pyx_t_124;
+  long __pyx_t_125;
+  long __pyx_t_126;
+  long __pyx_t_127;
+  long __pyx_t_128;
+  long __pyx_t_129;
+  long __pyx_t_130;
+  long __pyx_t_131;
+  __pyx_t_5numpy_int64_t __pyx_t_132;
+  __pyx_t_5numpy_int64_t __pyx_t_133;
+  __pyx_t_5numpy_int64_t __pyx_t_134;
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+  __pyx_t_5numpy_int64_t __pyx_t_161;
+  long __pyx_t_162;
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+  __pyx_t_5numpy_int64_t __pyx_t_172;
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+  __pyx_t_5numpy_int64_t __pyx_t_177;
+  __pyx_t_5numpy_int64_t __pyx_t_178;
+  __pyx_t_5numpy_int64_t __pyx_t_179;
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+  if (unlikely(__pyx_kwds)) {
+    Py_ssize_t kw_args = PyDict_Size(__pyx_kwds);
+    PyObject* values[8] = {0,0,0,0,0,0,0,0};
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+      case  7: values[6] = PyTuple_GET_ITEM(__pyx_args, 6);
+      case  6: values[5] = PyTuple_GET_ITEM(__pyx_args, 5);
+      case  5: values[4] = PyTuple_GET_ITEM(__pyx_args, 4);
+      case  4: values[3] = PyTuple_GET_ITEM(__pyx_args, 3);
+      case  3: values[2] = PyTuple_GET_ITEM(__pyx_args, 2);
+      case  2: values[1] = PyTuple_GET_ITEM(__pyx_args, 1);
+      case  1: values[0] = PyTuple_GET_ITEM(__pyx_args, 0);
+      case  0: break;
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+    switch (PyTuple_GET_SIZE(__pyx_args)) {
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+      values[1] = PyDict_GetItem(__pyx_kwds, __pyx_n_s__grid_t);
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+      else {
+        __Pyx_RaiseArgtupleInvalid("VoxelTraversal", 1, 8, 8, 1); {__pyx_filename = __pyx_f[4]; __pyx_lineno = 128; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+      }
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+      if (likely(values[2])) kw_args--;
+      else {
+        __Pyx_RaiseArgtupleInvalid("VoxelTraversal", 1, 8, 8, 2); {__pyx_filename = __pyx_f[4]; __pyx_lineno = 128; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+      }
+      case  3:
+      values[3] = PyDict_GetItem(__pyx_kwds, __pyx_n_s__left_edge);
+      if (likely(values[3])) kw_args--;
+      else {
+        __Pyx_RaiseArgtupleInvalid("VoxelTraversal", 1, 8, 8, 3); {__pyx_filename = __pyx_f[4]; __pyx_lineno = 128; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+      }
+      case  4:
+      values[4] = PyDict_GetItem(__pyx_kwds, __pyx_n_s__right_edge);
+      if (likely(values[4])) kw_args--;
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+        __Pyx_RaiseArgtupleInvalid("VoxelTraversal", 1, 8, 8, 4); {__pyx_filename = __pyx_f[4]; __pyx_lineno = 128; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+      }
+      case  5:
+      values[5] = PyDict_GetItem(__pyx_kwds, __pyx_n_s__dx);
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+        __Pyx_RaiseArgtupleInvalid("VoxelTraversal", 1, 8, 8, 5); {__pyx_filename = __pyx_f[4]; __pyx_lineno = 128; __pyx_clineno = __LINE__; goto __pyx_L3_error;}
+      }
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+  __pyx_bstruct_left_edge.buf = NULL;
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":141
+ *     cdef int i, x, y
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+      __pyx_t_18 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_v.buf, __pyx_t_83, __pyx_bstride_0_v));
+      if (unlikely(__pyx_t_18 == 0)) {
+        PyErr_Format(PyExc_ZeroDivisionError, "float division");
+        {__pyx_filename = __pyx_f[4]; __pyx_lineno = 180; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      }
+      __pyx_t_84 = __pyx_v_i;
+      *__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tmax.buf, __pyx_t_84, __pyx_bstride_0_tmax) = (__pyx_t_20 / __pyx_t_18);
+      goto __pyx_L17;
+    }
+    __pyx_L17:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":181
+ *         if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]
+ *         if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
+ *         tdelta[i] = (dx[i]/v[i])             # <<<<<<<<<<<<<<
+ *         if tdelta[i] < 0: tdelta[i] *= -1
+ *     # The variable intersect contains the point we first pierce the grid
+ */
+    __pyx_t_85 = __pyx_v_i;
+    __pyx_t_18 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_dx.buf, __pyx_t_85, __pyx_bstride_0_dx));
+    __pyx_t_86 = __pyx_v_i;
+    __pyx_t_20 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_v.buf, __pyx_t_86, __pyx_bstride_0_v));
+    if (unlikely(__pyx_t_20 == 0)) {
+      PyErr_Format(PyExc_ZeroDivisionError, "float division");
+      {__pyx_filename = __pyx_f[4]; __pyx_lineno = 181; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    }
+    __pyx_t_87 = __pyx_v_i;
+    *__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tdelta.buf, __pyx_t_87, __pyx_bstride_0_tdelta) = (__pyx_t_18 / __pyx_t_20);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":182
+ *         if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
+ *         tdelta[i] = (dx[i]/v[i])
+ *         if tdelta[i] < 0: tdelta[i] *= -1             # <<<<<<<<<<<<<<
+ *     # The variable intersect contains the point we first pierce the grid
+ *     enter_t = intersect_t
+ */
+    __pyx_t_88 = __pyx_v_i;
+    __pyx_t_34 = ((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tdelta.buf, __pyx_t_88, __pyx_bstride_0_tdelta)) < 0.0);
+    if (__pyx_t_34) {
+      __pyx_t_89 = __pyx_v_i;
+      *__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tdelta.buf, __pyx_t_89, __pyx_bstride_0_tdelta) *= -1.0;
+      goto __pyx_L18;
+    }
+    __pyx_L18:;
+  }
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":184
+ *         if tdelta[i] < 0: tdelta[i] *= -1
+ *     # The variable intersect contains the point we first pierce the grid
+ *     enter_t = intersect_t             # <<<<<<<<<<<<<<
+ *     while 1:
+ *         if (not (0 <= cur_ind[0] < grid_mask.shape[0])) or \
+ */
+  __pyx_v_enter_t = __pyx_v_intersect_t;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":185
+ *     # The variable intersect contains the point we first pierce the grid
+ *     enter_t = intersect_t
+ *     while 1:             # <<<<<<<<<<<<<<
+ *         if (not (0 <= cur_ind[0] < grid_mask.shape[0])) or \
+ *            (not (0 <= cur_ind[1] < grid_mask.shape[1])) or \
+ */
+  while (1) {
+    if (!1) break;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":186
+ *     enter_t = intersect_t
+ *     while 1:
+ *         if (not (0 <= cur_ind[0] < grid_mask.shape[0])) or \             # <<<<<<<<<<<<<<
+ *            (not (0 <= cur_ind[1] < grid_mask.shape[1])) or \
+ *            (not (0 <= cur_ind[2] < grid_mask.shape[2])):
+ */
+    __pyx_t_90 = 0;
+    __pyx_t_59 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_90, __pyx_bstride_0_cur_ind));
+    __pyx_t_34 = (0 <= __pyx_t_59);
+    if (__pyx_t_34) {
+      __pyx_t_34 = (__pyx_t_59 < (__pyx_v_grid_mask->dimensions[0]));
+    }
+    __pyx_t_13 = (!__pyx_t_34);
+    if (!__pyx_t_13) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":187
+ *     while 1:
+ *         if (not (0 <= cur_ind[0] < grid_mask.shape[0])) or \
+ *            (not (0 <= cur_ind[1] < grid_mask.shape[1])) or \             # <<<<<<<<<<<<<<
+ *            (not (0 <= cur_ind[2] < grid_mask.shape[2])):
+ *             break
+ */
+      __pyx_t_91 = 1;
+      __pyx_t_59 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_91, __pyx_bstride_0_cur_ind));
+      __pyx_t_34 = (0 <= __pyx_t_59);
+      if (__pyx_t_34) {
+        __pyx_t_34 = (__pyx_t_59 < (__pyx_v_grid_mask->dimensions[1]));
+      }
+      __pyx_t_31 = (!__pyx_t_34);
+      if (!__pyx_t_31) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":188
+ *         if (not (0 <= cur_ind[0] < grid_mask.shape[0])) or \
+ *            (not (0 <= cur_ind[1] < grid_mask.shape[1])) or \
+ *            (not (0 <= cur_ind[2] < grid_mask.shape[2])):             # <<<<<<<<<<<<<<
+ *             break
+ *         # Note that we are calculating t on the fly, but we get *negative* t
+ */
+        __pyx_t_92 = 2;
+        __pyx_t_59 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_92, __pyx_bstride_0_cur_ind));
+        __pyx_t_34 = (0 <= __pyx_t_59);
+        if (__pyx_t_34) {
+          __pyx_t_34 = (__pyx_t_59 < (__pyx_v_grid_mask->dimensions[2]));
+        }
+        __pyx_t_33 = (!__pyx_t_34);
+        __pyx_t_34 = __pyx_t_33;
+      } else {
+        __pyx_t_34 = __pyx_t_31;
+      }
+      __pyx_t_31 = __pyx_t_34;
+    } else {
+      __pyx_t_31 = __pyx_t_13;
+    }
+    if (__pyx_t_31) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":189
+ *            (not (0 <= cur_ind[1] < grid_mask.shape[1])) or \
+ *            (not (0 <= cur_ind[2] < grid_mask.shape[2])):
+ *             break             # <<<<<<<<<<<<<<
+ *         # Note that we are calculating t on the fly, but we get *negative* t
+ *         # values from what they should be.
+ */
+      goto __pyx_L20_break;
+      goto __pyx_L21;
+    }
+    __pyx_L21:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":193
+ *         # values from what they should be.
+ *         # If we've reached t = 1, we are done.
+ *         grid_mask[cur_ind[0], cur_ind[1], cur_ind[2]] = 1             # <<<<<<<<<<<<<<
+ *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
+ *             grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = 1.0 - enter_t
+ */
+    __pyx_t_93 = 0;
+    __pyx_t_94 = 1;
+    __pyx_t_95 = 2;
+    __pyx_t_59 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_93, __pyx_bstride_0_cur_ind));
+    __pyx_t_96 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_94, __pyx_bstride_0_cur_ind));
+    __pyx_t_97 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_95, __pyx_bstride_0_cur_ind));
+    *__Pyx_BufPtrStrided3d(__pyx_t_5numpy_int_t *, __pyx_bstruct_grid_mask.buf, __pyx_t_59, __pyx_bstride_0_grid_mask, __pyx_t_96, __pyx_bstride_1_grid_mask, __pyx_t_97, __pyx_bstride_2_grid_mask) = 1;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":194
+ *         # If we've reached t = 1, we are done.
+ *         grid_mask[cur_ind[0], cur_ind[1], cur_ind[2]] = 1
+ *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):             # <<<<<<<<<<<<<<
+ *             grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = 1.0 - enter_t
+ *             break
+ */
+    __pyx_t_98 = 0;
+    __pyx_t_31 = ((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tmax.buf, __pyx_t_98, __pyx_bstride_0_tmax)) > 1.0);
+    if (__pyx_t_31) {
+      __pyx_t_99 = 1;
+      __pyx_t_13 = ((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tmax.buf, __pyx_t_99, __pyx_bstride_0_tmax)) > 1.0);
+      if (__pyx_t_13) {
+        __pyx_t_100 = 2;
+        __pyx_t_34 = ((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tmax.buf, __pyx_t_100, __pyx_bstride_0_tmax)) > 1.0);
+        __pyx_t_33 = __pyx_t_34;
+      } else {
+        __pyx_t_33 = __pyx_t_13;
+      }
+      __pyx_t_13 = __pyx_t_33;
+    } else {
+      __pyx_t_13 = __pyx_t_31;
+    }
+    if (__pyx_t_13) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":195
+ *         grid_mask[cur_ind[0], cur_ind[1], cur_ind[2]] = 1
+ *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
+ *             grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = 1.0 - enter_t             # <<<<<<<<<<<<<<
+ *             break
+ *         if tmax[0] < tmax[1]:
+ */
+      __pyx_t_101 = 0;
+      __pyx_t_102 = 1;
+      __pyx_t_103 = 2;
+      __pyx_t_104 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_101, __pyx_bstride_0_cur_ind));
+      __pyx_t_105 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_102, __pyx_bstride_0_cur_ind));
+      __pyx_t_106 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_103, __pyx_bstride_0_cur_ind));
+      *__Pyx_BufPtrStrided3d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_grid_dt.buf, __pyx_t_104, __pyx_bstride_0_grid_dt, __pyx_t_105, __pyx_bstride_1_grid_dt, __pyx_t_106, __pyx_bstride_2_grid_dt) = (1.0 - __pyx_v_enter_t);
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":196
+ *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
+ *             grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = 1.0 - enter_t
+ *             break             # <<<<<<<<<<<<<<
+ *         if tmax[0] < tmax[1]:
+ *             if tmax[0] < tmax[2]:
+ */
+      goto __pyx_L20_break;
+      goto __pyx_L22;
+    }
+    __pyx_L22:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":197
+ *             grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = 1.0 - enter_t
+ *             break
+ *         if tmax[0] < tmax[1]:             # <<<<<<<<<<<<<<
+ *             if tmax[0] < tmax[2]:
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+ */
+    __pyx_t_107 = 0;
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+    if (__pyx_t_13) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":198
+ *             break
+ *         if tmax[0] < tmax[1]:
+ *             if tmax[0] < tmax[2]:             # <<<<<<<<<<<<<<
+ *                 grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
+ *                 grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[0] - enter_t
+ */
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+      __pyx_t_110 = 2;
+      __pyx_t_13 = ((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tmax.buf, __pyx_t_109, __pyx_bstride_0_tmax)) < (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tmax.buf, __pyx_t_110, __pyx_bstride_0_tmax)));
+      if (__pyx_t_13) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":199
+ *         if tmax[0] < tmax[1]:
+ *             if tmax[0] < tmax[2]:
+ *                 grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t             # <<<<<<<<<<<<<<
+ *                 grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[0] - enter_t
+ *                 enter_t = tmax[0]
+ */
+        __pyx_t_111 = 0;
+        __pyx_t_112 = 1;
+        __pyx_t_113 = 2;
+        __pyx_t_114 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_111, __pyx_bstride_0_cur_ind));
+        __pyx_t_115 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_112, __pyx_bstride_0_cur_ind));
+        __pyx_t_116 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_113, __pyx_bstride_0_cur_ind));
+        *__Pyx_BufPtrStrided3d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_grid_t.buf, __pyx_t_114, __pyx_bstride_0_grid_t, __pyx_t_115, __pyx_bstride_1_grid_t, __pyx_t_116, __pyx_bstride_2_grid_t) = __pyx_v_enter_t;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":200
+ *             if tmax[0] < tmax[2]:
+ *                 grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
+ *                 grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[0] - enter_t             # <<<<<<<<<<<<<<
+ *                 enter_t = tmax[0]
+ *                 tmax[0] += tdelta[0]
+ */
+        __pyx_t_117 = 0;
+        __pyx_t_118 = 0;
+        __pyx_t_119 = 1;
+        __pyx_t_120 = 2;
+        __pyx_t_121 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_118, __pyx_bstride_0_cur_ind));
+        __pyx_t_122 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_119, __pyx_bstride_0_cur_ind));
+        __pyx_t_123 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_120, __pyx_bstride_0_cur_ind));
+        *__Pyx_BufPtrStrided3d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_grid_dt.buf, __pyx_t_121, __pyx_bstride_0_grid_dt, __pyx_t_122, __pyx_bstride_1_grid_dt, __pyx_t_123, __pyx_bstride_2_grid_dt) = ((*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tmax.buf, __pyx_t_117, __pyx_bstride_0_tmax)) - __pyx_v_enter_t);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":201
+ *                 grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
+ *                 grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[0] - enter_t
+ *                 enter_t = tmax[0]             # <<<<<<<<<<<<<<
+ *                 tmax[0] += tdelta[0]
+ *                 cur_ind[0] += step[0]
+ */
+        __pyx_t_124 = 0;
+        __pyx_v_enter_t = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tmax.buf, __pyx_t_124, __pyx_bstride_0_tmax));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":202
+ *                 grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[0] - enter_t
+ *                 enter_t = tmax[0]
+ *                 tmax[0] += tdelta[0]             # <<<<<<<<<<<<<<
+ *                 cur_ind[0] += step[0]
+ *             else:
+ */
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+        __pyx_t_126 = 0;
+        *__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tmax.buf, __pyx_t_126, __pyx_bstride_0_tmax) += (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_tdelta.buf, __pyx_t_125, __pyx_bstride_0_tdelta));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":203
+ *                 enter_t = tmax[0]
+ *                 tmax[0] += tdelta[0]
+ *                 cur_ind[0] += step[0]             # <<<<<<<<<<<<<<
+ *             else:
+ *                 grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t
+ */
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+        __pyx_t_128 = 0;
+        *__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_cur_ind.buf, __pyx_t_128, __pyx_bstride_0_cur_ind) += (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_step.buf, __pyx_t_127, __pyx_bstride_0_step));
+        goto __pyx_L24;
+      }
+      /*else*/ {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":205
+ *                 cur_ind[0] += step[0]
+ *             else:
+ *                 grid_t[cur_ind[0], cur_ind[1], cur_ind[2]] = enter_t             # <<<<<<<<<<<<<<
+ *                 grid_dt[cur_ind[0], cur_ind[1], cur_ind[2]] = tmax[2] - enter_t
+ *                 enter_t = tmax[2]
+ */
+        __pyx_t_129 = 0;
+        __pyx_t_130 = 1;
+        __pyx_t_131 = 2;
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+    __pyx_t_53 = __pyx_v_i;
+    __pyx_t_54 = __pyx_v_i;
+    __pyx_t_8 = (((((__pyx_v_cur_ind[__pyx_v_i]) + (__pyx_v_step[__pyx_v_i])) * (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_dx.buf, __pyx_t_52, __pyx_bstride_0_dx))) + (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_left_edge.buf, __pyx_t_53, __pyx_bstride_0_left_edge))) - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_u.buf, __pyx_t_54, __pyx_bstride_0_u)));
+    __pyx_t_55 = __pyx_v_i;
+    __pyx_t_6 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_v.buf, __pyx_t_55, __pyx_bstride_0_v));
+    if (unlikely(__pyx_t_6 == 0)) {
+      PyErr_Format(PyExc_ZeroDivisionError, "float division");
+      {__pyx_filename = __pyx_f[4]; __pyx_lineno = 308; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    }
+    (__pyx_v_tmax[__pyx_v_i]) = (__pyx_t_8 / __pyx_t_6);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":309
+ *         cur_ind[i] = np.floor((intersect[i] + 1e-8*dx[i] - left_edge[i])/dx[i])
+ *         tmax[i] = (((cur_ind[i]+step[i])*dx[i])+left_edge[i]-u[i])/v[i]
+ *         if cur_ind[i] == dims[i] and step[i] < 0:             # <<<<<<<<<<<<<<
+ *             cur_ind[i] = dims[i] - 1
+ *         if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]
+ */
+    __pyx_t_3 = ((__pyx_v_cur_ind[__pyx_v_i]) == (__pyx_v_dims[__pyx_v_i]));
+    if (__pyx_t_3) {
+      __pyx_t_18 = ((__pyx_v_step[__pyx_v_i]) < 0);
+      __pyx_t_22 = __pyx_t_18;
+    } else {
+      __pyx_t_22 = __pyx_t_3;
+    }
+    if (__pyx_t_22) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":310
+ *         tmax[i] = (((cur_ind[i]+step[i])*dx[i])+left_edge[i]-u[i])/v[i]
+ *         if cur_ind[i] == dims[i] and step[i] < 0:
+ *             cur_ind[i] = dims[i] - 1             # <<<<<<<<<<<<<<
+ *         if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]
+ *         if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
+ */
+      (__pyx_v_cur_ind[__pyx_v_i]) = ((__pyx_v_dims[__pyx_v_i]) - 1);
+      goto __pyx_L17;
+    }
+    __pyx_L17:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":311
+ *         if cur_ind[i] == dims[i] and step[i] < 0:
+ *             cur_ind[i] = dims[i] - 1
+ *         if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]             # <<<<<<<<<<<<<<
+ *         if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
+ *         tdelta[i] = (dx[i]/v[i])
+ */
+    __pyx_t_22 = ((__pyx_v_step[__pyx_v_i]) > 0);
+    if (__pyx_t_22) {
+      __pyx_t_56 = __pyx_v_i;
+      __pyx_t_57 = __pyx_v_i;
+      __pyx_t_58 = __pyx_v_i;
+      __pyx_t_6 = (((((__pyx_v_cur_ind[__pyx_v_i]) + 1) * (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_dx.buf, __pyx_t_56, __pyx_bstride_0_dx))) + (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_left_edge.buf, __pyx_t_57, __pyx_bstride_0_left_edge))) - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_u.buf, __pyx_t_58, __pyx_bstride_0_u)));
+      __pyx_t_59 = __pyx_v_i;
+      __pyx_t_8 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_v.buf, __pyx_t_59, __pyx_bstride_0_v));
+      if (unlikely(__pyx_t_8 == 0)) {
+        PyErr_Format(PyExc_ZeroDivisionError, "float division");
+        {__pyx_filename = __pyx_f[4]; __pyx_lineno = 311; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      }
+      (__pyx_v_tmax[__pyx_v_i]) = (__pyx_t_6 / __pyx_t_8);
+      goto __pyx_L18;
+    }
+    __pyx_L18:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":312
+ *             cur_ind[i] = dims[i] - 1
+ *         if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]
+ *         if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]             # <<<<<<<<<<<<<<
+ *         tdelta[i] = (dx[i]/v[i])
+ *         if tdelta[i] < 0: tdelta[i] *= -1
+ */
+    __pyx_t_22 = ((__pyx_v_step[__pyx_v_i]) < 0);
+    if (__pyx_t_22) {
+      __pyx_t_60 = __pyx_v_i;
+      __pyx_t_61 = __pyx_v_i;
+      __pyx_t_62 = __pyx_v_i;
+      __pyx_t_8 = (((((__pyx_v_cur_ind[__pyx_v_i]) + 0) * (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_dx.buf, __pyx_t_60, __pyx_bstride_0_dx))) + (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_left_edge.buf, __pyx_t_61, __pyx_bstride_0_left_edge))) - (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_u.buf, __pyx_t_62, __pyx_bstride_0_u)));
+      __pyx_t_63 = __pyx_v_i;
+      __pyx_t_6 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_v.buf, __pyx_t_63, __pyx_bstride_0_v));
+      if (unlikely(__pyx_t_6 == 0)) {
+        PyErr_Format(PyExc_ZeroDivisionError, "float division");
+        {__pyx_filename = __pyx_f[4]; __pyx_lineno = 312; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      }
+      (__pyx_v_tmax[__pyx_v_i]) = (__pyx_t_8 / __pyx_t_6);
+      goto __pyx_L19;
+    }
+    __pyx_L19:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":313
+ *         if step[i] > 0: tmax[i] = (((cur_ind[i]+1)*dx[i])+left_edge[i]-u[i])/v[i]
+ *         if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
+ *         tdelta[i] = (dx[i]/v[i])             # <<<<<<<<<<<<<<
+ *         if tdelta[i] < 0: tdelta[i] *= -1
+ *     # The variable intersect contains the point we first pierce the grid
+ */
+    __pyx_t_64 = __pyx_v_i;
+    __pyx_t_6 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_dx.buf, __pyx_t_64, __pyx_bstride_0_dx));
+    __pyx_t_65 = __pyx_v_i;
+    __pyx_t_8 = (*__Pyx_BufPtrStrided1d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_v.buf, __pyx_t_65, __pyx_bstride_0_v));
+    if (unlikely(__pyx_t_8 == 0)) {
+      PyErr_Format(PyExc_ZeroDivisionError, "float division");
+      {__pyx_filename = __pyx_f[4]; __pyx_lineno = 313; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    }
+    (__pyx_v_tdelta[__pyx_v_i]) = (__pyx_t_6 / __pyx_t_8);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":314
+ *         if step[i] < 0: tmax[i] = (((cur_ind[i]+0)*dx[i])+left_edge[i]-u[i])/v[i]
+ *         tdelta[i] = (dx[i]/v[i])
+ *         if tdelta[i] < 0: tdelta[i] *= -1             # <<<<<<<<<<<<<<
+ *     # The variable intersect contains the point we first pierce the grid
+ *     enter_t = intersect_t
+ */
+    __pyx_t_22 = ((__pyx_v_tdelta[__pyx_v_i]) < 0.0);
+    if (__pyx_t_22) {
+      (__pyx_v_tdelta[__pyx_v_i]) *= -1.0;
+      goto __pyx_L20;
+    }
+    __pyx_L20:;
+  }
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":316
+ *         if tdelta[i] < 0: tdelta[i] *= -1
+ *     # The variable intersect contains the point we first pierce the grid
+ *     enter_t = intersect_t             # <<<<<<<<<<<<<<
+ *     if (not (0 <= cur_ind[0] < dims[0])) or \
+ *        (not (0 <= cur_ind[1] < dims[1])) or \
+ */
+  __pyx_v_enter_t = __pyx_v_intersect_t;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":317
+ *     # The variable intersect contains the point we first pierce the grid
+ *     enter_t = intersect_t
+ *     if (not (0 <= cur_ind[0] < dims[0])) or \             # <<<<<<<<<<<<<<
+ *        (not (0 <= cur_ind[1] < dims[1])) or \
+ *        (not (0 <= cur_ind[2] < dims[2])):
+ */
+  __pyx_t_51 = (__pyx_v_cur_ind[0]);
+  __pyx_t_22 = (0 <= __pyx_t_51);
+  if (__pyx_t_22) {
+    __pyx_t_22 = (__pyx_t_51 < (__pyx_v_dims[0]));
+  }
+  __pyx_t_3 = (!__pyx_t_22);
+  if (!__pyx_t_3) {
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":318
+ *     enter_t = intersect_t
+ *     if (not (0 <= cur_ind[0] < dims[0])) or \
+ *        (not (0 <= cur_ind[1] < dims[1])) or \             # <<<<<<<<<<<<<<
+ *        (not (0 <= cur_ind[2] < dims[2])):
+ *         #print "Returning: cur_ind", cur_ind[0], cur_ind[1], cur_ind[2]
+ */
+    __pyx_t_51 = (__pyx_v_cur_ind[1]);
+    __pyx_t_22 = (0 <= __pyx_t_51);
+    if (__pyx_t_22) {
+      __pyx_t_22 = (__pyx_t_51 < (__pyx_v_dims[1]));
+    }
+    __pyx_t_18 = (!__pyx_t_22);
+    if (!__pyx_t_18) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":319
+ *     if (not (0 <= cur_ind[0] < dims[0])) or \
+ *        (not (0 <= cur_ind[1] < dims[1])) or \
+ *        (not (0 <= cur_ind[2] < dims[2])):             # <<<<<<<<<<<<<<
+ *         #print "Returning: cur_ind", cur_ind[0], cur_ind[1], cur_ind[2]
+ *         #print "  dims:     ", dims[0], dims[1], dims[2]
+ */
+      __pyx_t_51 = (__pyx_v_cur_ind[2]);
+      __pyx_t_22 = (0 <= __pyx_t_51);
+      if (__pyx_t_22) {
+        __pyx_t_22 = (__pyx_t_51 < (__pyx_v_dims[2]));
+      }
+      __pyx_t_20 = (!__pyx_t_22);
+      __pyx_t_22 = __pyx_t_20;
+    } else {
+      __pyx_t_22 = __pyx_t_18;
+    }
+    __pyx_t_18 = __pyx_t_22;
+  } else {
+    __pyx_t_18 = __pyx_t_3;
+  }
+  if (__pyx_t_18) {
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":326
+ *         #print "  u        :", u[0], u[1], u[2]
+ *         #
+ *         return             # <<<<<<<<<<<<<<
+ *     #print cur_ind[0], dims[0], cur_ind[1], dims[1], cur_ind[2], dims[2]
+ *     dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]
+ */
+    __Pyx_XDECREF(__pyx_r);
+    __pyx_r = Py_None; __Pyx_INCREF(Py_None);
+    goto __pyx_L0;
+    goto __pyx_L21;
+  }
+  __pyx_L21:;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":328
+ *         return
+ *     #print cur_ind[0], dims[0], cur_ind[1], dims[1], cur_ind[2], dims[2]
+ *     dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]             # <<<<<<<<<<<<<<
+ *     #dt = 1e300
+ *     while 1:
+ */
+  __pyx_t_51 = (__pyx_v_cur_ind[0]);
+  __pyx_t_66 = (__pyx_v_cur_ind[1]);
+  __pyx_t_67 = (__pyx_v_cur_ind[2]);
+  __pyx_v_dv = (*__Pyx_BufPtrStrided3d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_data.buf, __pyx_t_51, __pyx_bstride_0_data, __pyx_t_66, __pyx_bstride_1_data, __pyx_t_67, __pyx_bstride_2_data));
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":330
+ *     dv = data[cur_ind[0], cur_ind[1], cur_ind[2]]
+ *     #dt = 1e300
+ *     while 1:             # <<<<<<<<<<<<<<
+ *         if image[ind,3] >= 1.0: break
+ *         if (not (0 <= cur_ind[0] < dims[0])) or \
+ */
+  while (1) {
+    if (!1) break;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":331
+ *     #dt = 1e300
+ *     while 1:
+ *         if image[ind,3] >= 1.0: break             # <<<<<<<<<<<<<<
+ *         if (not (0 <= cur_ind[0] < dims[0])) or \
+ *            (not (0 <= cur_ind[1] < dims[1])) or \
+ */
+    __pyx_t_1 = __pyx_v_ind;
+    __pyx_t_68 = 3;
+    __pyx_t_18 = ((*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_image.buf, __pyx_t_1, __pyx_bstride_0_image, __pyx_t_68, __pyx_bstride_1_image)) >= 1.0);
+    if (__pyx_t_18) {
+      goto __pyx_L23_break;
+      goto __pyx_L24;
+    }
+    __pyx_L24:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":332
+ *     while 1:
+ *         if image[ind,3] >= 1.0: break
+ *         if (not (0 <= cur_ind[0] < dims[0])) or \             # <<<<<<<<<<<<<<
+ *            (not (0 <= cur_ind[1] < dims[1])) or \
+ *            (not (0 <= cur_ind[2] < dims[2])):
+ */
+    __pyx_t_69 = (__pyx_v_cur_ind[0]);
+    __pyx_t_18 = (0 <= __pyx_t_69);
+    if (__pyx_t_18) {
+      __pyx_t_18 = (__pyx_t_69 < (__pyx_v_dims[0]));
+    }
+    __pyx_t_3 = (!__pyx_t_18);
+    if (!__pyx_t_3) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":333
+ *         if image[ind,3] >= 1.0: break
+ *         if (not (0 <= cur_ind[0] < dims[0])) or \
+ *            (not (0 <= cur_ind[1] < dims[1])) or \             # <<<<<<<<<<<<<<
+ *            (not (0 <= cur_ind[2] < dims[2])):
+ *             break
+ */
+      __pyx_t_69 = (__pyx_v_cur_ind[1]);
+      __pyx_t_18 = (0 <= __pyx_t_69);
+      if (__pyx_t_18) {
+        __pyx_t_18 = (__pyx_t_69 < (__pyx_v_dims[1]));
+      }
+      __pyx_t_22 = (!__pyx_t_18);
+      if (!__pyx_t_22) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":334
+ *         if (not (0 <= cur_ind[0] < dims[0])) or \
+ *            (not (0 <= cur_ind[1] < dims[1])) or \
+ *            (not (0 <= cur_ind[2] < dims[2])):             # <<<<<<<<<<<<<<
+ *             break
+ *         # Do our transfer here
+ */
+        __pyx_t_69 = (__pyx_v_cur_ind[2]);
+        __pyx_t_18 = (0 <= __pyx_t_69);
+        if (__pyx_t_18) {
+          __pyx_t_18 = (__pyx_t_69 < (__pyx_v_dims[2]));
+        }
+        __pyx_t_20 = (!__pyx_t_18);
+        __pyx_t_18 = __pyx_t_20;
+      } else {
+        __pyx_t_18 = __pyx_t_22;
+      }
+      __pyx_t_22 = __pyx_t_18;
+    } else {
+      __pyx_t_22 = __pyx_t_3;
+    }
+    if (__pyx_t_22) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":335
+ *            (not (0 <= cur_ind[1] < dims[1])) or \
+ *            (not (0 <= cur_ind[2] < dims[2])):
+ *             break             # <<<<<<<<<<<<<<
+ *         # Do our transfer here
+ *         for n in range(nshells):
+ */
+      goto __pyx_L23_break;
+      goto __pyx_L25;
+    }
+    __pyx_L25:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":337
+ *             break
+ *         # Do our transfer here
+ *         for n in range(nshells):             # <<<<<<<<<<<<<<
+ *             dist = shells[n, 0] - dv
+ *             if dist < shells[n,1]:
+ */
+    __pyx_t_70 = __pyx_v_nshells;
+    for (__pyx_t_71 = 0; __pyx_t_71 < __pyx_t_70; __pyx_t_71+=1) {
+      __pyx_v_n = __pyx_t_71;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":338
+ *         # Do our transfer here
+ *         for n in range(nshells):
+ *             dist = shells[n, 0] - dv             # <<<<<<<<<<<<<<
+ *             if dist < shells[n,1]:
+ *                 dist = exp(-dist/8.0)
+ */
+      __pyx_t_72 = __pyx_v_n;
+      __pyx_t_73 = 0;
+      __pyx_v_dist = ((*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_72, __pyx_bstride_0_shells, __pyx_t_73, __pyx_bstride_1_shells)) - __pyx_v_dv);
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":339
+ *         for n in range(nshells):
+ *             dist = shells[n, 0] - dv
+ *             if dist < shells[n,1]:             # <<<<<<<<<<<<<<
+ *                 dist = exp(-dist/8.0)
+ *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
+ */
+      __pyx_t_74 = __pyx_v_n;
+      __pyx_t_75 = 1;
+      __pyx_t_22 = (__pyx_v_dist < (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_74, __pyx_bstride_0_shells, __pyx_t_75, __pyx_bstride_1_shells)));
+      if (__pyx_t_22) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":340
+ *             dist = shells[n, 0] - dv
+ *             if dist < shells[n,1]:
+ *                 dist = exp(-dist/8.0)             # <<<<<<<<<<<<<<
+ *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
+ *                 image[ind,0] += alpha*shells[n,2]*dist
+ */
+        __pyx_v_dist = exp(((-__pyx_v_dist) / 8.0));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":341
+ *             if dist < shells[n,1]:
+ *                 dist = exp(-dist/8.0)
+ *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt             # <<<<<<<<<<<<<<
+ *                 image[ind,0] += alpha*shells[n,2]*dist
+ *                 image[ind,1] += alpha*shells[n,3]*dist
+ */
+        __pyx_t_76 = __pyx_v_n;
+        __pyx_t_77 = 5;
+        __pyx_t_78 = __pyx_v_n;
+        __pyx_t_79 = 5;
+        __pyx_v_alpha = ((1.0 - (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_76, __pyx_bstride_0_shells, __pyx_t_77, __pyx_bstride_1_shells))) * (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_78, __pyx_bstride_0_shells, __pyx_t_79, __pyx_bstride_1_shells)));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":342
+ *                 dist = exp(-dist/8.0)
+ *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
+ *                 image[ind,0] += alpha*shells[n,2]*dist             # <<<<<<<<<<<<<<
+ *                 image[ind,1] += alpha*shells[n,3]*dist
+ *                 image[ind,2] += alpha*shells[n,4]*dist
+ */
+        __pyx_t_80 = __pyx_v_n;
+        __pyx_t_81 = 2;
+        __pyx_t_82 = __pyx_v_ind;
+        __pyx_t_83 = 0;
+        *__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_image.buf, __pyx_t_82, __pyx_bstride_0_image, __pyx_t_83, __pyx_bstride_1_image) += ((__pyx_v_alpha * (*__Pyx_BufPtrStrided2d(__pyx_t_5numpy_float64_t *, __pyx_bstruct_shells.buf, __pyx_t_80, __pyx_bstride_0_shells, __pyx_t_81, __pyx_bstride_1_shells))) * __pyx_v_dist);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":343
+ *                 alpha = (1.0 - shells[n,5])*shells[n,5]#*dt
+ *                 image[ind,0] += alpha*shells[n,2]*dist
+ *                 image[ind,1] += alpha*shells[n,3]*dist             # <<<<<<<<<<<<<<
+ *                 image[ind,2] += alpha*shells[n,4]*dist
+ *                 image[ind,3] += alpha*shells[n,5]*dist
+ */
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+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":344
+ *                 image[ind,0] += alpha*shells[n,2]*dist
+ *                 image[ind,1] += alpha*shells[n,3]*dist
+ *                 image[ind,2] += alpha*shells[n,4]*dist             # <<<<<<<<<<<<<<
+ *                 image[ind,3] += alpha*shells[n,5]*dist
+ *                 #image[ind,i] += rgba[i]*dist*rgba[3]/dt
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+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":345
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+ *                 image[ind,2] += alpha*shells[n,4]*dist
+ *                 image[ind,3] += alpha*shells[n,5]*dist             # <<<<<<<<<<<<<<
+ *                 #image[ind,i] += rgba[i]*dist*rgba[3]/dt
+ *                 #print rgba[i], image[ind,i], dist, dt
+ */
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+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":348
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+ *                 #print rgba[i], image[ind,i], dist, dt
+ *                 break             # <<<<<<<<<<<<<<
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+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":349
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+ *                 break
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+ */
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+      __pyx_t_3 = __pyx_t_20;
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+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":350
+ *                 break
+ *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
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+ *         if tmax[0] < tmax[1]:
+ */
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+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":351
+ *         if (tmax[0] > 1.0) and (tmax[1] > 1.0) and (tmax[2] > 1.0):
+ *             dt = 1.0 - enter_t
+ *             break             # <<<<<<<<<<<<<<
+ *         if tmax[0] < tmax[1]:
+ *             if tmax[0] < tmax[2]:
+ */
+      goto __pyx_L23_break;
+      goto __pyx_L29;
+    }
+    __pyx_L29:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":352
+ *             dt = 1.0 - enter_t
+ *             break
+ *         if tmax[0] < tmax[1]:             # <<<<<<<<<<<<<<
+ *             if tmax[0] < tmax[2]:
+ *                 dt = tmax[0] - enter_t
+ */
+    __pyx_t_3 = ((__pyx_v_tmax[0]) < (__pyx_v_tmax[1]));
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+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":353
+ *             break
+ *         if tmax[0] < tmax[1]:
+ *             if tmax[0] < tmax[2]:             # <<<<<<<<<<<<<<
+ *                 dt = tmax[0] - enter_t
+ *                 enter_t = tmax[0]
+ */
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+      if (__pyx_t_3) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":354
+ *         if tmax[0] < tmax[1]:
+ *             if tmax[0] < tmax[2]:
+ *                 dt = tmax[0] - enter_t             # <<<<<<<<<<<<<<
+ *                 enter_t = tmax[0]
+ *                 tmax[0] += tdelta[0]
+ */
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+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":355
+ *             if tmax[0] < tmax[2]:
+ *                 dt = tmax[0] - enter_t
+ *                 enter_t = tmax[0]             # <<<<<<<<<<<<<<
+ *                 tmax[0] += tdelta[0]
+ *                 cur_ind[0] += step[0]
+ */
+        __pyx_v_enter_t = (__pyx_v_tmax[0]);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":356
+ *                 dt = tmax[0] - enter_t
+ *                 enter_t = tmax[0]
+ *                 tmax[0] += tdelta[0]             # <<<<<<<<<<<<<<
+ *                 cur_ind[0] += step[0]
+ *             else:
+ */
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+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":357
+ *                 enter_t = tmax[0]
+ *                 tmax[0] += tdelta[0]
+ *                 cur_ind[0] += step[0]             # <<<<<<<<<<<<<<
+ *             else:
+ *                 dt = tmax[2] - enter_t
+ */
+        (__pyx_v_cur_ind[0]) += (__pyx_v_step[0]);
+        goto __pyx_L31;
+      }
+      /*else*/ {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":359
+ *                 cur_ind[0] += step[0]
+ *             else:
+ *                 dt = tmax[2] - enter_t             # <<<<<<<<<<<<<<
+ *                 enter_t = tmax[2]
+ *                 tmax[2] += tdelta[2]
+ */
+        __pyx_v_dt = ((__pyx_v_tmax[2]) - __pyx_v_enter_t);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":360
+ *             else:
+ *                 dt = tmax[2] - enter_t
+ *                 enter_t = tmax[2]             # <<<<<<<<<<<<<<
+ *                 tmax[2] += tdelta[2]
+ *                 cur_ind[2] += step[2]
+ */
+        __pyx_v_enter_t = (__pyx_v_tmax[2]);
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+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":361
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+ *                 enter_t = tmax[2]
+ *                 tmax[2] += tdelta[2]             # <<<<<<<<<<<<<<
+ *                 cur_ind[2] += step[2]
+ *         else:
+ */
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+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":362
+ *                 enter_t = tmax[2]
+ *                 tmax[2] += tdelta[2]
+ *                 cur_ind[2] += step[2]             # <<<<<<<<<<<<<<
+ *         else:
+ *             if tmax[1] < tmax[2]:
+ */
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+      __pyx_L31:;
+      goto __pyx_L30;
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+    /*else*/ {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":364
+ *                 cur_ind[2] += step[2]
+ *         else:
+ *             if tmax[1] < tmax[2]:             # <<<<<<<<<<<<<<
+ *                 dt = tmax[1] - enter_t
+ *                 enter_t = tmax[1]
+ */
+      __pyx_t_3 = ((__pyx_v_tmax[1]) < (__pyx_v_tmax[2]));
+      if (__pyx_t_3) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":365
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+ *             if tmax[1] < tmax[2]:
+ *                 dt = tmax[1] - enter_t             # <<<<<<<<<<<<<<
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+ */
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+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":366
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+ *             else:
+ */
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+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":368
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+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":373
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+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":374
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+ *     return i1
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+ *     return i1             # <<<<<<<<<<<<<<
+ * 
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":244
+ *         self.avp_pos = vp_pos
+ *         self.avp_dir = vp_dir
+ *         self.acenter = center             # <<<<<<<<<<<<<<
+ *         self.aimage = image
+ *         self.ax_vec = x_vec
+ */
+  __Pyx_INCREF(((PyObject *)__pyx_v_center));
+  __Pyx_GIVEREF(((PyObject *)__pyx_v_center));
+  __Pyx_GOTREF(((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)__pyx_v_self)->acenter);
+  __Pyx_DECREF(((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)__pyx_v_self)->acenter);
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+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":245
+ *         self.avp_dir = vp_dir
+ *         self.acenter = center
+ *         self.aimage = image             # <<<<<<<<<<<<<<
+ *         self.ax_vec = x_vec
+ *         self.ay_vec = y_vec
+ */
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+  __Pyx_GIVEREF(((PyObject *)__pyx_v_image));
+  __Pyx_GOTREF(((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)__pyx_v_self)->aimage);
+  __Pyx_DECREF(((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)__pyx_v_self)->aimage);
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+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":246
+ *         self.acenter = center
+ *         self.aimage = image
+ *         self.ax_vec = x_vec             # <<<<<<<<<<<<<<
+ *         self.ay_vec = y_vec
+ *         self.vp_pos = <np.float64_t *> vp_pos.data
+ */
+  __Pyx_INCREF(((PyObject *)__pyx_v_x_vec));
+  __Pyx_GIVEREF(((PyObject *)__pyx_v_x_vec));
+  __Pyx_GOTREF(((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)__pyx_v_self)->ax_vec);
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":247
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+ *         self.ax_vec = x_vec
+ *         self.ay_vec = y_vec             # <<<<<<<<<<<<<<
+ *         self.vp_pos = <np.float64_t *> vp_pos.data
+ *         self.vp_dir = <np.float64_t *> vp_dir.data
+ */
+  __Pyx_INCREF(((PyObject *)__pyx_v_y_vec));
+  __Pyx_GIVEREF(((PyObject *)__pyx_v_y_vec));
+  __Pyx_GOTREF(((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)__pyx_v_self)->ay_vec);
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":248
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+ *         self.ay_vec = y_vec
+ *         self.vp_pos = <np.float64_t *> vp_pos.data             # <<<<<<<<<<<<<<
+ *         self.vp_dir = <np.float64_t *> vp_dir.data
+ *         self.center = <np.float64_t *> center.data
+ */
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+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":249
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+ *         self.vp_pos = <np.float64_t *> vp_pos.data
+ *         self.vp_dir = <np.float64_t *> vp_dir.data             # <<<<<<<<<<<<<<
+ *         self.center = <np.float64_t *> center.data
+ *         self.image = <np.float64_t *> image.data
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+  ((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)__pyx_v_self)->vp_dir = ((__pyx_t_5numpy_float64_t *)__pyx_v_vp_dir->data);
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+ *         self.vp_dir = <np.float64_t *> vp_dir.data
+ *         self.center = <np.float64_t *> center.data             # <<<<<<<<<<<<<<
+ *         self.image = <np.float64_t *> image.data
+ *         self.x_vec = <np.float64_t *> x_vec.data
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":251
+ *         self.vp_dir = <np.float64_t *> vp_dir.data
+ *         self.center = <np.float64_t *> center.data
+ *         self.image = <np.float64_t *> image.data             # <<<<<<<<<<<<<<
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+ *         self.y_vec = <np.float64_t *> y_vec.data
+ */
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":252
+ *         self.center = <np.float64_t *> center.data
+ *         self.image = <np.float64_t *> image.data
+ *         self.x_vec = <np.float64_t *> x_vec.data             # <<<<<<<<<<<<<<
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+ */
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":253
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+ *         self.x_vec = <np.float64_t *> x_vec.data
+ *         self.y_vec = <np.float64_t *> y_vec.data             # <<<<<<<<<<<<<<
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":254
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+ *         self.y_vec = <np.float64_t *> y_vec.data
+ *         self.nv[0] = vp_pos.shape[0]             # <<<<<<<<<<<<<<
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+ *         for i in range(3):             # <<<<<<<<<<<<<<
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+ *         # turn.  Might benefit from a more sophisticated intersection check,
+ */
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+  PyObject *__pyx_r = NULL;
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+  int __pyx_t_2;
+  int __pyx_t_3;
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+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":347
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+ *         vp.get_start_stop(extrema, iter)
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+ *         hit = 0
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+ *         vp.get_start_stop(extrema, iter)
+ *         iter[0] = iclip(iter[0], 0, vp.nv[0])
+ */
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":349
+ *         hit = 0
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+ *         vp.get_start_stop(extrema, iter)             # <<<<<<<<<<<<<<
+ *         iter[0] = iclip(iter[0], 0, vp.nv[0])
+ *         iter[1] = iclip(iter[1], 0, vp.nv[0])
+ */
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+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":350
+ *         self.calculate_extent(vp, extrema)
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+ *         iter[0] = iclip(iter[0], 0, vp.nv[0])             # <<<<<<<<<<<<<<
+ *         iter[1] = iclip(iter[1], 0, vp.nv[0])
+ *         iter[2] = iclip(iter[2], 0, vp.nv[1])
+ */
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":351
+ *         vp.get_start_stop(extrema, iter)
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+ *         iter[1] = iclip(iter[1], 0, vp.nv[0])             # <<<<<<<<<<<<<<
+ *         iter[2] = iclip(iter[2], 0, vp.nv[1])
+ *         iter[3] = iclip(iter[3], 0, vp.nv[1])
+ */
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":352
+ *         iter[0] = iclip(iter[0], 0, vp.nv[0])
+ *         iter[1] = iclip(iter[1], 0, vp.nv[0])
+ *         iter[2] = iclip(iter[2], 0, vp.nv[1])             # <<<<<<<<<<<<<<
+ *         iter[3] = iclip(iter[3], 0, vp.nv[1])
+ *         if vp.vd_strides[0] == -1:
+ */
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+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":353
+ *         iter[1] = iclip(iter[1], 0, vp.nv[0])
+ *         iter[2] = iclip(iter[2], 0, vp.nv[1])
+ *         iter[3] = iclip(iter[3], 0, vp.nv[1])             # <<<<<<<<<<<<<<
+ *         if vp.vd_strides[0] == -1:
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+ */
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":354
+ *         iter[2] = iclip(iter[2], 0, vp.nv[1])
+ *         iter[3] = iclip(iter[3], 0, vp.nv[1])
+ *         if vp.vd_strides[0] == -1:             # <<<<<<<<<<<<<<
+ *             for vi in range(iter[0], iter[1]):
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+ */
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+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":355
+ *         iter[3] = iclip(iter[3], 0, vp.nv[1])
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+ */
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+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":356
+ *         if vp.vd_strides[0] == -1:
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+ */
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+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":357
+ *             for vi in range(iter[0], iter[1]):
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+ *                     vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
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+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":358
+ *                 for vj in range(iter[2], iter[3]):
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+ *                     vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)             # <<<<<<<<<<<<<<
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+ */
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+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":359
+ *                     vp.copy_into(vp.vp_pos, v_pos, vi, vj, 3, vp.vp_strides)
+ *                     vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
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+ *                     vp.copy_back(rgba, vp.image, vi, vj, 3, vp.im_strides)
+ *         else:
+ */
+        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)((struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self)->__pyx_vtab)->integrate_ray(((struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self), __pyx_v_v_pos, __pyx_v_vp->vp_dir, __pyx_v_rgba, __pyx_v_tf);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":360
+ *                     vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
+ *                     self.integrate_ray(v_pos, vp.vp_dir, rgba, tf)
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+ *         else:
+ *             # If we do not have an orthographic projection, we have to cast all
+ */
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+      }
+    }
+    goto __pyx_L6;
+  }
+  /*else*/ {
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":364
+ *             # If we do not have an orthographic projection, we have to cast all
+ *             # our rays (until we can get an extrema calculation...)
+ *             for vi in range(vp.nv[0]):             # <<<<<<<<<<<<<<
+ *                 for vj in range(vp.nv[1]):
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+ */
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+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":365
+ *             # our rays (until we can get an extrema calculation...)
+ *             for vi in range(vp.nv[0]):
+ *                 for vj in range(vp.nv[1]):             # <<<<<<<<<<<<<<
+ *                     vp.copy_into(vp.vp_pos, v_pos, vi, vj, 3, vp.vp_strides)
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+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":366
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+ *                     vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
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+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":367
+ *                 for vj in range(vp.nv[1]):
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+ *                     vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)             # <<<<<<<<<<<<<<
+ *                     vp.copy_into(vp.vp_dir, v_dir, vi, vj, 3, vp.vd_strides)
+ *                     self.integrate_ray(v_pos, v_dir, rgba, tf)
+ */
+        ((struct __pyx_vtabstruct_2yt_9amr_utils_VectorPlane *)__pyx_v_vp->__pyx_vtab)->copy_into(__pyx_v_vp, __pyx_v_vp->image, __pyx_v_rgba, __pyx_v_vi, __pyx_v_vj, 3, __pyx_v_vp->im_strides);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":368
+ *                     vp.copy_into(vp.vp_pos, v_pos, vi, vj, 3, vp.vp_strides)
+ *                     vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
+ *                     vp.copy_into(vp.vp_dir, v_dir, vi, vj, 3, vp.vd_strides)             # <<<<<<<<<<<<<<
+ *                     self.integrate_ray(v_pos, v_dir, rgba, tf)
+ *                     vp.copy_back(rgba, vp.image, vi, vj, 3, vp.im_strides)
+ */
+        ((struct __pyx_vtabstruct_2yt_9amr_utils_VectorPlane *)__pyx_v_vp->__pyx_vtab)->copy_into(__pyx_v_vp, __pyx_v_vp->vp_dir, __pyx_v_v_dir, __pyx_v_vi, __pyx_v_vj, 3, __pyx_v_vp->vd_strides);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":369
+ *                     vp.copy_into(vp.image, rgba, vi, vj, 3, vp.im_strides)
+ *                     vp.copy_into(vp.vp_dir, v_dir, vi, vj, 3, vp.vd_strides)
+ *                     self.integrate_ray(v_pos, v_dir, rgba, tf)             # <<<<<<<<<<<<<<
+ *                     vp.copy_back(rgba, vp.image, vi, vj, 3, vp.im_strides)
+ *         return hit
+ */
+        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)((struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self)->__pyx_vtab)->integrate_ray(((struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self), __pyx_v_v_pos, __pyx_v_v_dir, __pyx_v_rgba, __pyx_v_tf);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":370
+ *                     vp.copy_into(vp.vp_dir, v_dir, vi, vj, 3, vp.vd_strides)
+ *                     self.integrate_ray(v_pos, v_dir, rgba, tf)
+ *                     vp.copy_back(rgba, vp.image, vi, vj, 3, vp.im_strides)             # <<<<<<<<<<<<<<
+ *         return hit
+ * 
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+ *                     vp.copy_back(rgba, vp.image, vi, vj, 3, vp.im_strides)
+ *         return hit             # <<<<<<<<<<<<<<
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+  __pyx_L1_error:;
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+ *     @cython.wraparound(False)
+ *     cdef void calculate_extent(self, VectorPlane vp,             # <<<<<<<<<<<<<<
+ *                                np.float64_t extrema[4]):
+ *         # We do this for all eight corners
+ */
+
+static  void __pyx_f_2yt_9amr_utils_15PartitionedGrid_calculate_extent(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *__pyx_v_self, struct __pyx_obj_2yt_9amr_utils_VectorPlane *__pyx_v_vp, __pyx_t_5numpy_float64_t *__pyx_v_extrema) {
+  __pyx_t_5numpy_float64_t *__pyx_v_edges[2];
+  __pyx_t_5numpy_float64_t __pyx_v_temp;
+  int __pyx_v_i;
+  int __pyx_v_j;
+  int __pyx_v_k;
+  double __pyx_t_1;
+  int __pyx_t_2;
+  int __pyx_t_3;
+  int __pyx_t_4;
+  int __pyx_t_5;
+  __Pyx_RefNannySetupContext("calculate_extent");
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+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":379
+ *         # We do this for all eight corners
+ *         cdef np.float64_t *edges[2], temp
+ *         edges[0] = self.left_edge             # <<<<<<<<<<<<<<
+ *         edges[1] = self.right_edge
+ *         extrema[0] = extrema[2] = 1e300; extrema[1] = extrema[3] = -1e300
+ */
+  (__pyx_v_edges[0]) = __pyx_v_self->left_edge;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":380
+ *         cdef np.float64_t *edges[2], temp
+ *         edges[0] = self.left_edge
+ *         edges[1] = self.right_edge             # <<<<<<<<<<<<<<
+ *         extrema[0] = extrema[2] = 1e300; extrema[1] = extrema[3] = -1e300
+ *         cdef int i, j, k
+ */
+  (__pyx_v_edges[1]) = __pyx_v_self->right_edge;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":381
+ *         edges[0] = self.left_edge
+ *         edges[1] = self.right_edge
+ *         extrema[0] = extrema[2] = 1e300; extrema[1] = extrema[3] = -1e300             # <<<<<<<<<<<<<<
+ *         cdef int i, j, k
+ *         for i in range(2):
+ */
+  (__pyx_v_extrema[0]) = 1e300;
+  (__pyx_v_extrema[2]) = 1e300;
+  __pyx_t_1 = (-1e300);
+  (__pyx_v_extrema[1]) = __pyx_t_1;
+  (__pyx_v_extrema[3]) = __pyx_t_1;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":383
+ *         extrema[0] = extrema[2] = 1e300; extrema[1] = extrema[3] = -1e300
+ *         cdef int i, j, k
+ *         for i in range(2):             # <<<<<<<<<<<<<<
+ *             for j in range(2):
+ *                 for k in range(2):
+ */
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+    __pyx_v_i = __pyx_t_2;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":384
+ *         cdef int i, j, k
+ *         for i in range(2):
+ *             for j in range(2):             # <<<<<<<<<<<<<<
+ *                 for k in range(2):
+ *                     # This should rotate it into the vector plane
+ */
+    for (__pyx_t_3 = 0; __pyx_t_3 < 2; __pyx_t_3+=1) {
+      __pyx_v_j = __pyx_t_3;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":385
+ *         for i in range(2):
+ *             for j in range(2):
+ *                 for k in range(2):             # <<<<<<<<<<<<<<
+ *                     # This should rotate it into the vector plane
+ *                     temp  = edges[i][0] * vp.x_vec[0]
+ */
+      for (__pyx_t_4 = 0; __pyx_t_4 < 2; __pyx_t_4+=1) {
+        __pyx_v_k = __pyx_t_4;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":387
+ *                 for k in range(2):
+ *                     # This should rotate it into the vector plane
+ *                     temp  = edges[i][0] * vp.x_vec[0]             # <<<<<<<<<<<<<<
+ *                     temp += edges[j][1] * vp.x_vec[1]
+ *                     temp += edges[k][2] * vp.x_vec[2]
+ */
+        __pyx_v_temp = (((__pyx_v_edges[__pyx_v_i])[0]) * (__pyx_v_vp->x_vec[0]));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":388
+ *                     # This should rotate it into the vector plane
+ *                     temp  = edges[i][0] * vp.x_vec[0]
+ *                     temp += edges[j][1] * vp.x_vec[1]             # <<<<<<<<<<<<<<
+ *                     temp += edges[k][2] * vp.x_vec[2]
+ *                     if temp < extrema[0]: extrema[0] = temp
+ */
+        __pyx_v_temp += (((__pyx_v_edges[__pyx_v_j])[1]) * (__pyx_v_vp->x_vec[1]));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":389
+ *                     temp  = edges[i][0] * vp.x_vec[0]
+ *                     temp += edges[j][1] * vp.x_vec[1]
+ *                     temp += edges[k][2] * vp.x_vec[2]             # <<<<<<<<<<<<<<
+ *                     if temp < extrema[0]: extrema[0] = temp
+ *                     if temp > extrema[1]: extrema[1] = temp
+ */
+        __pyx_v_temp += (((__pyx_v_edges[__pyx_v_k])[2]) * (__pyx_v_vp->x_vec[2]));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":390
+ *                     temp += edges[j][1] * vp.x_vec[1]
+ *                     temp += edges[k][2] * vp.x_vec[2]
+ *                     if temp < extrema[0]: extrema[0] = temp             # <<<<<<<<<<<<<<
+ *                     if temp > extrema[1]: extrema[1] = temp
+ *                     temp  = edges[i][0] * vp.y_vec[0]
+ */
+        __pyx_t_5 = (__pyx_v_temp < (__pyx_v_extrema[0]));
+        if (__pyx_t_5) {
+          (__pyx_v_extrema[0]) = __pyx_v_temp;
+          goto __pyx_L9;
+        }
+        __pyx_L9:;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":391
+ *                     temp += edges[k][2] * vp.x_vec[2]
+ *                     if temp < extrema[0]: extrema[0] = temp
+ *                     if temp > extrema[1]: extrema[1] = temp             # <<<<<<<<<<<<<<
+ *                     temp  = edges[i][0] * vp.y_vec[0]
+ *                     temp += edges[j][1] * vp.y_vec[1]
+ */
+        __pyx_t_5 = (__pyx_v_temp > (__pyx_v_extrema[1]));
+        if (__pyx_t_5) {
+          (__pyx_v_extrema[1]) = __pyx_v_temp;
+          goto __pyx_L10;
+        }
+        __pyx_L10:;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":392
+ *                     if temp < extrema[0]: extrema[0] = temp
+ *                     if temp > extrema[1]: extrema[1] = temp
+ *                     temp  = edges[i][0] * vp.y_vec[0]             # <<<<<<<<<<<<<<
+ *                     temp += edges[j][1] * vp.y_vec[1]
+ *                     temp += edges[k][2] * vp.y_vec[2]
+ */
+        __pyx_v_temp = (((__pyx_v_edges[__pyx_v_i])[0]) * (__pyx_v_vp->y_vec[0]));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":393
+ *                     if temp > extrema[1]: extrema[1] = temp
+ *                     temp  = edges[i][0] * vp.y_vec[0]
+ *                     temp += edges[j][1] * vp.y_vec[1]             # <<<<<<<<<<<<<<
+ *                     temp += edges[k][2] * vp.y_vec[2]
+ *                     if temp < extrema[2]: extrema[2] = temp
+ */
+        __pyx_v_temp += (((__pyx_v_edges[__pyx_v_j])[1]) * (__pyx_v_vp->y_vec[1]));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":394
+ *                     temp  = edges[i][0] * vp.y_vec[0]
+ *                     temp += edges[j][1] * vp.y_vec[1]
+ *                     temp += edges[k][2] * vp.y_vec[2]             # <<<<<<<<<<<<<<
+ *                     if temp < extrema[2]: extrema[2] = temp
+ *                     if temp > extrema[3]: extrema[3] = temp
+ */
+        __pyx_v_temp += (((__pyx_v_edges[__pyx_v_k])[2]) * (__pyx_v_vp->y_vec[2]));
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":395
+ *                     temp += edges[j][1] * vp.y_vec[1]
+ *                     temp += edges[k][2] * vp.y_vec[2]
+ *                     if temp < extrema[2]: extrema[2] = temp             # <<<<<<<<<<<<<<
+ *                     if temp > extrema[3]: extrema[3] = temp
+ *         #print extrema[0], extrema[1], extrema[2], extrema[3]
+ */
+        __pyx_t_5 = (__pyx_v_temp < (__pyx_v_extrema[2]));
+        if (__pyx_t_5) {
+          (__pyx_v_extrema[2]) = __pyx_v_temp;
+          goto __pyx_L11;
+        }
+        __pyx_L11:;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":396
+ *                     temp += edges[k][2] * vp.y_vec[2]
+ *                     if temp < extrema[2]: extrema[2] = temp
+ *                     if temp > extrema[3]: extrema[3] = temp             # <<<<<<<<<<<<<<
+ *         #print extrema[0], extrema[1], extrema[2], extrema[3]
+ * 
+ */
+        __pyx_t_5 = (__pyx_v_temp > (__pyx_v_extrema[3]));
+        if (__pyx_t_5) {
+          (__pyx_v_extrema[3]) = __pyx_v_temp;
+          goto __pyx_L12;
+        }
+        __pyx_L12:;
+      }
+    }
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+
+  __Pyx_RefNannyFinishContext();
+}
+
+/* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":401
+ *     @cython.boundscheck(False)
+ *     @cython.wraparound(False)
+ *     cdef int integrate_ray(self, np.float64_t v_pos[3],             # <<<<<<<<<<<<<<
+ *                                  np.float64_t v_dir[3],
+ *                                  np.float64_t rgba[4],
+ */
+
+static  int __pyx_f_2yt_9amr_utils_15PartitionedGrid_integrate_ray(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *__pyx_v_self, __pyx_t_5numpy_float64_t *__pyx_v_v_pos, __pyx_t_5numpy_float64_t *__pyx_v_v_dir, __pyx_t_5numpy_float64_t *__pyx_v_rgba, struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *__pyx_v_tf) {
+  int __pyx_v_cur_ind[3];
+  int __pyx_v_step[3];
+  int __pyx_v_x;
+  int __pyx_v_y;
+  int __pyx_v_i;
+  int __pyx_v_hit;
+  int __pyx_v_direction;
+  __pyx_t_5numpy_float64_t __pyx_v_intersect_t;
+  __pyx_t_5numpy_float64_t __pyx_v_iv_dir[3];
+  __pyx_t_5numpy_float64_t __pyx_v_intersect[3];
+  __pyx_t_5numpy_float64_t __pyx_v_tmax[3];
+  __pyx_t_5numpy_float64_t __pyx_v_tdelta[3];
+  __pyx_t_5numpy_float64_t __pyx_v_enter_t;
+  __pyx_t_5numpy_float64_t __pyx_v_exit_t;
+  __pyx_t_5numpy_float64_t __pyx_v_tr;
+  __pyx_t_5numpy_float64_t __pyx_v_tl;
+  __pyx_t_5numpy_float64_t __pyx_v_temp_x;
+  __pyx_t_5numpy_float64_t __pyx_v_temp_y;
+  int __pyx_r;
+  int __pyx_t_1;
+  int __pyx_t_2;
+  __pyx_t_5numpy_float64_t __pyx_t_3;
+  int __pyx_t_4;
+  int __pyx_t_5;
+  int __pyx_t_6;
+  int __pyx_t_7;
+  int __pyx_t_8;
+  int __pyx_t_9;
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+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":406
+ *                                  TransferFunctionProxy tf):
+ *         cdef int cur_ind[3], step[3], x, y, i, n, flat_ind, hit, direction
+ *         cdef np.float64_t intersect_t = 1.0             # <<<<<<<<<<<<<<
+ *         cdef np.float64_t iv_dir[3]
+ *         cdef np.float64_t intersect[3], tmax[3], tdelta[3]
+ */
+  __pyx_v_intersect_t = 1.0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":411
+ *         cdef np.float64_t enter_t, dist, alpha, dt, exit_t
+ *         cdef np.float64_t tr, tl, temp_x, temp_y, dv
+ *         for i in range(3):             # <<<<<<<<<<<<<<
+ *             if (v_dir[i] < 0):
+ *                 step[i] = -1
+ */
+  for (__pyx_t_1 = 0; __pyx_t_1 < 3; __pyx_t_1+=1) {
+    __pyx_v_i = __pyx_t_1;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":412
+ *         cdef np.float64_t tr, tl, temp_x, temp_y, dv
+ *         for i in range(3):
+ *             if (v_dir[i] < 0):             # <<<<<<<<<<<<<<
+ *                 step[i] = -1
+ *             elif (v_dir[i] == 0):
+ */
+    __pyx_t_2 = ((__pyx_v_v_dir[__pyx_v_i]) < 0.0);
+    if (__pyx_t_2) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":413
+ *         for i in range(3):
+ *             if (v_dir[i] < 0):
+ *                 step[i] = -1             # <<<<<<<<<<<<<<
+ *             elif (v_dir[i] == 0):
+ *                 step[i] = 1
+ */
+      (__pyx_v_step[__pyx_v_i]) = -1;
+      goto __pyx_L5;
+    }
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":414
+ *             if (v_dir[i] < 0):
+ *                 step[i] = -1
+ *             elif (v_dir[i] == 0):             # <<<<<<<<<<<<<<
+ *                 step[i] = 1
+ *                 tmax[i] = 1e60
+ */
+    __pyx_t_2 = ((__pyx_v_v_dir[__pyx_v_i]) == 0.0);
+    if (__pyx_t_2) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":415
+ *                 step[i] = -1
+ *             elif (v_dir[i] == 0):
+ *                 step[i] = 1             # <<<<<<<<<<<<<<
+ *                 tmax[i] = 1e60
+ *                 iv_dir[i] = 1e60
+ */
+      (__pyx_v_step[__pyx_v_i]) = 1;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":416
+ *             elif (v_dir[i] == 0):
+ *                 step[i] = 1
+ *                 tmax[i] = 1e60             # <<<<<<<<<<<<<<
+ *                 iv_dir[i] = 1e60
+ *                 tdelta[i] = 1e-60
+ */
+      (__pyx_v_tmax[__pyx_v_i]) = 1e60;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":417
+ *                 step[i] = 1
+ *                 tmax[i] = 1e60
+ *                 iv_dir[i] = 1e60             # <<<<<<<<<<<<<<
+ *                 tdelta[i] = 1e-60
+ *                 continue
+ */
+      (__pyx_v_iv_dir[__pyx_v_i]) = 1e60;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":418
+ *                 tmax[i] = 1e60
+ *                 iv_dir[i] = 1e60
+ *                 tdelta[i] = 1e-60             # <<<<<<<<<<<<<<
+ *                 continue
+ *             else:
+ */
+      (__pyx_v_tdelta[__pyx_v_i]) = 1e-60;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":419
+ *                 iv_dir[i] = 1e60
+ *                 tdelta[i] = 1e-60
+ *                 continue             # <<<<<<<<<<<<<<
+ *             else:
+ *                 step[i] = 1
+ */
+      goto __pyx_L3_continue;
+      goto __pyx_L5;
+    }
+    /*else*/ {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":421
+ *                 continue
+ *             else:
+ *                 step[i] = 1             # <<<<<<<<<<<<<<
+ *             x = (i+1) % 3
+ *             y = (i+2) % 3
+ */
+      (__pyx_v_step[__pyx_v_i]) = 1;
+    }
+    __pyx_L5:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":422
+ *             else:
+ *                 step[i] = 1
+ *             x = (i+1) % 3             # <<<<<<<<<<<<<<
+ *             y = (i+2) % 3
+ *             iv_dir[i] = 1.0/v_dir[i]
+ */
+    __pyx_v_x = __Pyx_mod_long((__pyx_v_i + 1), 3);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":423
+ *                 step[i] = 1
+ *             x = (i+1) % 3
+ *             y = (i+2) % 3             # <<<<<<<<<<<<<<
+ *             iv_dir[i] = 1.0/v_dir[i]
+ *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
+ */
+    __pyx_v_y = __Pyx_mod_long((__pyx_v_i + 2), 3);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":424
+ *             x = (i+1) % 3
+ *             y = (i+2) % 3
+ *             iv_dir[i] = 1.0/v_dir[i]             # <<<<<<<<<<<<<<
+ *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
+ *             temp_x = (v_pos[x] + tl*v_dir[x])
+ */
+    __pyx_t_3 = (__pyx_v_v_dir[__pyx_v_i]);
+    if (unlikely(__pyx_t_3 == 0)) {
+      PyErr_Format(PyExc_ZeroDivisionError, "float division");
+      {__pyx_filename = __pyx_f[2]; __pyx_lineno = 424; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+    }
+    (__pyx_v_iv_dir[__pyx_v_i]) = (1.0 / __pyx_t_3);
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":425
+ *             y = (i+2) % 3
+ *             iv_dir[i] = 1.0/v_dir[i]
+ *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]             # <<<<<<<<<<<<<<
+ *             temp_x = (v_pos[x] + tl*v_dir[x])
+ *             temp_y = (v_pos[y] + tl*v_dir[y])
+ */
+    __pyx_v_tl = (((__pyx_v_self->left_edge[__pyx_v_i]) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":426
+ *             iv_dir[i] = 1.0/v_dir[i]
+ *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
+ *             temp_x = (v_pos[x] + tl*v_dir[x])             # <<<<<<<<<<<<<<
+ *             temp_y = (v_pos[y] + tl*v_dir[y])
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+ */
+    __pyx_v_temp_x = ((__pyx_v_v_pos[__pyx_v_x]) + (__pyx_v_tl * (__pyx_v_v_dir[__pyx_v_x])));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":427
+ *             tl = (self.left_edge[i] - v_pos[i])*iv_dir[i]
+ *             temp_x = (v_pos[x] + tl*v_dir[x])
+ *             temp_y = (v_pos[y] + tl*v_dir[y])             # <<<<<<<<<<<<<<
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+ */
+    __pyx_v_temp_y = ((__pyx_v_v_pos[__pyx_v_y]) + (__pyx_v_tl * (__pyx_v_v_dir[__pyx_v_y])));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":428
+ *             temp_x = (v_pos[x] + tl*v_dir[x])
+ *             temp_y = (v_pos[y] + tl*v_dir[y])
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \             # <<<<<<<<<<<<<<
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+ *                0.0 <= tl and tl < intersect_t:
+ */
+    __pyx_t_2 = ((__pyx_v_self->left_edge[__pyx_v_x]) <= __pyx_v_temp_x);
+    if (__pyx_t_2) {
+      __pyx_t_4 = (__pyx_v_temp_x <= (__pyx_v_self->right_edge[__pyx_v_x]));
+      if (__pyx_t_4) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":429
+ *             temp_y = (v_pos[y] + tl*v_dir[y])
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \             # <<<<<<<<<<<<<<
+ *                0.0 <= tl and tl < intersect_t:
+ *                 direction = i
+ */
+        __pyx_t_5 = ((__pyx_v_self->left_edge[__pyx_v_y]) <= __pyx_v_temp_y);
+        if (__pyx_t_5) {
+          __pyx_t_6 = (__pyx_v_temp_y <= (__pyx_v_self->right_edge[__pyx_v_y]));
+          if (__pyx_t_6) {
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":430
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+ *                0.0 <= tl and tl < intersect_t:             # <<<<<<<<<<<<<<
+ *                 direction = i
+ *                 intersect_t = tl
+ */
+            __pyx_t_7 = (0.0 <= __pyx_v_tl);
+            if (__pyx_t_7) {
+              __pyx_t_8 = (__pyx_v_tl < __pyx_v_intersect_t);
+              __pyx_t_9 = __pyx_t_8;
+            } else {
+              __pyx_t_9 = __pyx_t_7;
+            }
+            __pyx_t_7 = __pyx_t_9;
+          } else {
+            __pyx_t_7 = __pyx_t_6;
+          }
+          __pyx_t_6 = __pyx_t_7;
+        } else {
+          __pyx_t_6 = __pyx_t_5;
+        }
+        __pyx_t_5 = __pyx_t_6;
+      } else {
+        __pyx_t_5 = __pyx_t_4;
+      }
+      __pyx_t_4 = __pyx_t_5;
+    } else {
+      __pyx_t_4 = __pyx_t_2;
+    }
+    if (__pyx_t_4) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":431
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+ *                0.0 <= tl and tl < intersect_t:
+ *                 direction = i             # <<<<<<<<<<<<<<
+ *                 intersect_t = tl
+ *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
+ */
+      __pyx_v_direction = __pyx_v_i;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":432
+ *                0.0 <= tl and tl < intersect_t:
+ *                 direction = i
+ *                 intersect_t = tl             # <<<<<<<<<<<<<<
+ *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
+ *             temp_x = (v_pos[x] + tr*v_dir[x])
+ */
+      __pyx_v_intersect_t = __pyx_v_tl;
+      goto __pyx_L6;
+    }
+    __pyx_L6:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":433
+ *                 direction = i
+ *                 intersect_t = tl
+ *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]             # <<<<<<<<<<<<<<
+ *             temp_x = (v_pos[x] + tr*v_dir[x])
+ *             temp_y = (v_pos[y] + tr*v_dir[y])
+ */
+    __pyx_v_tr = (((__pyx_v_self->right_edge[__pyx_v_i]) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":434
+ *                 intersect_t = tl
+ *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
+ *             temp_x = (v_pos[x] + tr*v_dir[x])             # <<<<<<<<<<<<<<
+ *             temp_y = (v_pos[y] + tr*v_dir[y])
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+ */
+    __pyx_v_temp_x = ((__pyx_v_v_pos[__pyx_v_x]) + (__pyx_v_tr * (__pyx_v_v_dir[__pyx_v_x])));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":435
+ *             tr = (self.right_edge[i] - v_pos[i])*iv_dir[i]
+ *             temp_x = (v_pos[x] + tr*v_dir[x])
+ *             temp_y = (v_pos[y] + tr*v_dir[y])             # <<<<<<<<<<<<<<
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+ */
+    __pyx_v_temp_y = ((__pyx_v_v_pos[__pyx_v_y]) + (__pyx_v_tr * (__pyx_v_v_dir[__pyx_v_y])));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":436
+ *             temp_x = (v_pos[x] + tr*v_dir[x])
+ *             temp_y = (v_pos[y] + tr*v_dir[y])
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \             # <<<<<<<<<<<<<<
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+ *                0.0 <= tr and tr < intersect_t:
+ */
+    __pyx_t_4 = ((__pyx_v_self->left_edge[__pyx_v_x]) <= __pyx_v_temp_x);
+    if (__pyx_t_4) {
+      __pyx_t_2 = (__pyx_v_temp_x <= (__pyx_v_self->right_edge[__pyx_v_x]));
+      if (__pyx_t_2) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":437
+ *             temp_y = (v_pos[y] + tr*v_dir[y])
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \             # <<<<<<<<<<<<<<
+ *                0.0 <= tr and tr < intersect_t:
+ *                 direction = i
+ */
+        __pyx_t_5 = ((__pyx_v_self->left_edge[__pyx_v_y]) <= __pyx_v_temp_y);
+        if (__pyx_t_5) {
+          __pyx_t_6 = (__pyx_v_temp_y <= (__pyx_v_self->right_edge[__pyx_v_y]));
+          if (__pyx_t_6) {
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":438
+ *             if self.left_edge[x] <= temp_x and temp_x <= self.right_edge[x] and \
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+ *                0.0 <= tr and tr < intersect_t:             # <<<<<<<<<<<<<<
+ *                 direction = i
+ *                 intersect_t = tr
+ */
+            __pyx_t_7 = (0.0 <= __pyx_v_tr);
+            if (__pyx_t_7) {
+              __pyx_t_9 = (__pyx_v_tr < __pyx_v_intersect_t);
+              __pyx_t_8 = __pyx_t_9;
+            } else {
+              __pyx_t_8 = __pyx_t_7;
+            }
+            __pyx_t_7 = __pyx_t_8;
+          } else {
+            __pyx_t_7 = __pyx_t_6;
+          }
+          __pyx_t_6 = __pyx_t_7;
+        } else {
+          __pyx_t_6 = __pyx_t_5;
+        }
+        __pyx_t_5 = __pyx_t_6;
+      } else {
+        __pyx_t_5 = __pyx_t_2;
+      }
+      __pyx_t_2 = __pyx_t_5;
+    } else {
+      __pyx_t_2 = __pyx_t_4;
+    }
+    if (__pyx_t_2) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":439
+ *                self.left_edge[y] <= temp_y and temp_y <= self.right_edge[y] and \
+ *                0.0 <= tr and tr < intersect_t:
+ *                 direction = i             # <<<<<<<<<<<<<<
+ *                 intersect_t = tr
+ *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
+ */
+      __pyx_v_direction = __pyx_v_i;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":440
+ *                0.0 <= tr and tr < intersect_t:
+ *                 direction = i
+ *                 intersect_t = tr             # <<<<<<<<<<<<<<
+ *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
+ *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
+ */
+      __pyx_v_intersect_t = __pyx_v_tr;
+      goto __pyx_L7;
+    }
+    __pyx_L7:;
+    __pyx_L3_continue:;
+  }
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":441
+ *                 direction = i
+ *                 intersect_t = tr
+ *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \             # <<<<<<<<<<<<<<
+ *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
+ *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
+ */
+  __pyx_t_2 = ((__pyx_v_self->left_edge[0]) <= (__pyx_v_v_pos[0]));
+  if (__pyx_t_2) {
+    __pyx_t_4 = ((__pyx_v_v_pos[0]) <= (__pyx_v_self->right_edge[0]));
+    if (__pyx_t_4) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":442
+ *                 intersect_t = tr
+ *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
+ *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \             # <<<<<<<<<<<<<<
+ *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
+ *             intersect_t = 0.0
+ */
+      __pyx_t_5 = ((__pyx_v_self->left_edge[1]) <= (__pyx_v_v_pos[1]));
+      if (__pyx_t_5) {
+        __pyx_t_6 = ((__pyx_v_v_pos[1]) <= (__pyx_v_self->right_edge[1]));
+        if (__pyx_t_6) {
+
+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":443
+ *         if self.left_edge[0] <= v_pos[0] and v_pos[0] <= self.right_edge[0] and \
+ *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
+ *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:             # <<<<<<<<<<<<<<
+ *             intersect_t = 0.0
+ *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
+ */
+          __pyx_t_7 = ((__pyx_v_self->left_edge[2]) <= (__pyx_v_v_pos[2]));
+          if (__pyx_t_7) {
+            __pyx_t_8 = ((__pyx_v_v_pos[2]) <= (__pyx_v_self->right_edge[2]));
+            __pyx_t_9 = __pyx_t_8;
+          } else {
+            __pyx_t_9 = __pyx_t_7;
+          }
+          __pyx_t_7 = __pyx_t_9;
+        } else {
+          __pyx_t_7 = __pyx_t_6;
+        }
+        __pyx_t_6 = __pyx_t_7;
+      } else {
+        __pyx_t_6 = __pyx_t_5;
+      }
+      __pyx_t_5 = __pyx_t_6;
+    } else {
+      __pyx_t_5 = __pyx_t_4;
+    }
+    __pyx_t_4 = __pyx_t_5;
+  } else {
+    __pyx_t_4 = __pyx_t_2;
+  }
+  if (__pyx_t_4) {
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":444
+ *            self.left_edge[1] <= v_pos[1] and v_pos[1] <= self.right_edge[1] and \
+ *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
+ *             intersect_t = 0.0             # <<<<<<<<<<<<<<
+ *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
+ *         for i in range(3):
+ */
+    __pyx_v_intersect_t = 0.0;
+    goto __pyx_L8;
+  }
+  __pyx_L8:;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":445
+ *            self.left_edge[2] <= v_pos[2] and v_pos[2] <= self.right_edge[2]:
+ *             intersect_t = 0.0
+ *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0             # <<<<<<<<<<<<<<
+ *         for i in range(3):
+ *             intersect[i] = v_pos[i] + intersect_t * v_dir[i]
+ */
+  __pyx_t_4 = (0.0 <= __pyx_v_intersect_t);
+  if (__pyx_t_4) {
+    __pyx_t_2 = (__pyx_v_intersect_t < 1.0);
+    __pyx_t_5 = __pyx_t_2;
+  } else {
+    __pyx_t_5 = __pyx_t_4;
+  }
+  __pyx_t_4 = (!__pyx_t_5);
+  if (__pyx_t_4) {
+    __pyx_r = 0;
+    goto __pyx_L0;
+    goto __pyx_L9;
+  }
+  __pyx_L9:;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":446
+ *             intersect_t = 0.0
+ *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
+ *         for i in range(3):             # <<<<<<<<<<<<<<
+ *             intersect[i] = v_pos[i] + intersect_t * v_dir[i]
+ *             cur_ind[i] = <int> floor((intersect[i] +
+ */
+  for (__pyx_t_1 = 0; __pyx_t_1 < 3; __pyx_t_1+=1) {
+    __pyx_v_i = __pyx_t_1;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":447
+ *         if not ((0.0 <= intersect_t) and (intersect_t < 1.0)): return 0
+ *         for i in range(3):
+ *             intersect[i] = v_pos[i] + intersect_t * v_dir[i]             # <<<<<<<<<<<<<<
+ *             cur_ind[i] = <int> floor((intersect[i] +
+ *                                       step[i]*1e-8*self.dds[i] -
+ */
+    (__pyx_v_intersect[__pyx_v_i]) = ((__pyx_v_v_pos[__pyx_v_i]) + (__pyx_v_intersect_t * (__pyx_v_v_dir[__pyx_v_i])));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":448
+ *         for i in range(3):
+ *             intersect[i] = v_pos[i] + intersect_t * v_dir[i]
+ *             cur_ind[i] = <int> floor((intersect[i] +             # <<<<<<<<<<<<<<
+ *                                       step[i]*1e-8*self.dds[i] -
+ *                                       self.left_edge[i])*self.idds[i])
+ */
+    (__pyx_v_cur_ind[__pyx_v_i]) = ((int)floor(((((__pyx_v_intersect[__pyx_v_i]) + (((__pyx_v_step[__pyx_v_i]) * 1e-8) * (__pyx_v_self->dds[__pyx_v_i]))) - (__pyx_v_self->left_edge[__pyx_v_i])) * (__pyx_v_self->idds[__pyx_v_i]))));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":451
+ *                                       step[i]*1e-8*self.dds[i] -
+ *                                       self.left_edge[i])*self.idds[i])
+ *             tmax[i] = (((cur_ind[i]+step[i])*self.dds[i])+             # <<<<<<<<<<<<<<
+ *                         self.left_edge[i]-v_pos[i])*iv_dir[i]
+ *             # This deals with the asymmetry in having our indices refer to the
+ */
+    (__pyx_v_tmax[__pyx_v_i]) = ((((((__pyx_v_cur_ind[__pyx_v_i]) + (__pyx_v_step[__pyx_v_i])) * (__pyx_v_self->dds[__pyx_v_i])) + (__pyx_v_self->left_edge[__pyx_v_i])) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":456
+ *             # left edge of a cell, but the right edge of the brick being one
+ *             # extra zone out.
+ *             if cur_ind[i] == self.dims[i] and step[i] < 0:             # <<<<<<<<<<<<<<
+ *                 cur_ind[i] = self.dims[i] - 1
+ *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
+ */
+    __pyx_t_4 = ((__pyx_v_cur_ind[__pyx_v_i]) == (__pyx_v_self->dims[__pyx_v_i]));
+    if (__pyx_t_4) {
+      __pyx_t_5 = ((__pyx_v_step[__pyx_v_i]) < 0);
+      __pyx_t_2 = __pyx_t_5;
+    } else {
+      __pyx_t_2 = __pyx_t_4;
+    }
+    if (__pyx_t_2) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":457
+ *             # extra zone out.
+ *             if cur_ind[i] == self.dims[i] and step[i] < 0:
+ *                 cur_ind[i] = self.dims[i] - 1             # <<<<<<<<<<<<<<
+ *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
+ *             if step[i] > 0:
+ */
+      (__pyx_v_cur_ind[__pyx_v_i]) = ((__pyx_v_self->dims[__pyx_v_i]) - 1);
+      goto __pyx_L12;
+    }
+    __pyx_L12:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":458
+ *             if cur_ind[i] == self.dims[i] and step[i] < 0:
+ *                 cur_ind[i] = self.dims[i] - 1
+ *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0             # <<<<<<<<<<<<<<
+ *             if step[i] > 0:
+ *                 tmax[i] = (((cur_ind[i]+1)*self.dds[i])
+ */
+    __pyx_t_2 = ((__pyx_v_cur_ind[__pyx_v_i]) < 0);
+    if (!__pyx_t_2) {
+      __pyx_t_4 = ((__pyx_v_cur_ind[__pyx_v_i]) >= (__pyx_v_self->dims[__pyx_v_i]));
+      __pyx_t_5 = __pyx_t_4;
+    } else {
+      __pyx_t_5 = __pyx_t_2;
+    }
+    if (__pyx_t_5) {
+      __pyx_r = 0;
+      goto __pyx_L0;
+      goto __pyx_L13;
+    }
+    __pyx_L13:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":459
+ *                 cur_ind[i] = self.dims[i] - 1
+ *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
+ *             if step[i] > 0:             # <<<<<<<<<<<<<<
+ *                 tmax[i] = (((cur_ind[i]+1)*self.dds[i])
+ *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
+ */
+    __pyx_t_5 = ((__pyx_v_step[__pyx_v_i]) > 0);
+    if (__pyx_t_5) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":460
+ *             if cur_ind[i] < 0 or cur_ind[i] >= self.dims[i]: return 0
+ *             if step[i] > 0:
+ *                 tmax[i] = (((cur_ind[i]+1)*self.dds[i])             # <<<<<<<<<<<<<<
+ *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
+ *             if step[i] < 0:
+ */
+      (__pyx_v_tmax[__pyx_v_i]) = ((((((__pyx_v_cur_ind[__pyx_v_i]) + 1) * (__pyx_v_self->dds[__pyx_v_i])) + (__pyx_v_self->left_edge[__pyx_v_i])) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
+      goto __pyx_L14;
+    }
+    __pyx_L14:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":462
+ *                 tmax[i] = (((cur_ind[i]+1)*self.dds[i])
+ *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
+ *             if step[i] < 0:             # <<<<<<<<<<<<<<
+ *                 tmax[i] = (((cur_ind[i]+0)*self.dds[i])
+ *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
+ */
+    __pyx_t_5 = ((__pyx_v_step[__pyx_v_i]) < 0);
+    if (__pyx_t_5) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":463
+ *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
+ *             if step[i] < 0:
+ *                 tmax[i] = (((cur_ind[i]+0)*self.dds[i])             # <<<<<<<<<<<<<<
+ *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
+ *             tdelta[i] = (self.dds[i]*iv_dir[i])
+ */
+      (__pyx_v_tmax[__pyx_v_i]) = ((((((__pyx_v_cur_ind[__pyx_v_i]) + 0) * (__pyx_v_self->dds[__pyx_v_i])) + (__pyx_v_self->left_edge[__pyx_v_i])) - (__pyx_v_v_pos[__pyx_v_i])) * (__pyx_v_iv_dir[__pyx_v_i]));
+      goto __pyx_L15;
+    }
+    __pyx_L15:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":465
+ *                 tmax[i] = (((cur_ind[i]+0)*self.dds[i])
+ *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
+ *             tdelta[i] = (self.dds[i]*iv_dir[i])             # <<<<<<<<<<<<<<
+ *             if tdelta[i] < 0: tdelta[i] *= -1
+ *         # We have to jumpstart our calculation
+ */
+    (__pyx_v_tdelta[__pyx_v_i]) = ((__pyx_v_self->dds[__pyx_v_i]) * (__pyx_v_iv_dir[__pyx_v_i]));
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":466
+ *                             +self.left_edge[i]-v_pos[i])*iv_dir[i]
+ *             tdelta[i] = (self.dds[i]*iv_dir[i])
+ *             if tdelta[i] < 0: tdelta[i] *= -1             # <<<<<<<<<<<<<<
+ *         # We have to jumpstart our calculation
+ *         enter_t = intersect_t
+ */
+    __pyx_t_5 = ((__pyx_v_tdelta[__pyx_v_i]) < 0.0);
+    if (__pyx_t_5) {
+      (__pyx_v_tdelta[__pyx_v_i]) *= -1.0;
+      goto __pyx_L16;
+    }
+    __pyx_L16:;
+  }
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":468
+ *             if tdelta[i] < 0: tdelta[i] *= -1
+ *         # We have to jumpstart our calculation
+ *         enter_t = intersect_t             # <<<<<<<<<<<<<<
+ *         while 1:
+ *             # dims here is one less than the dimensions of the data,
+ */
+  __pyx_v_enter_t = __pyx_v_intersect_t;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":469
+ *         # We have to jumpstart our calculation
+ *         enter_t = intersect_t
+ *         while 1:             # <<<<<<<<<<<<<<
+ *             # dims here is one less than the dimensions of the data,
+ *             # but we are tracing on the grid, not on the data...
+ */
+  while (1) {
+    if (!1) break;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":472
+ *             # dims here is one less than the dimensions of the data,
+ *             # but we are tracing on the grid, not on the data...
+ *             if (not (0 <= cur_ind[0] < self.dims[0])) or \             # <<<<<<<<<<<<<<
+ *                (not (0 <= cur_ind[1] < self.dims[1])) or \
+ *                (not (0 <= cur_ind[2] < self.dims[2])):
+ */
+    __pyx_t_1 = (__pyx_v_cur_ind[0]);
+    __pyx_t_5 = (0 <= __pyx_t_1);
+    if (__pyx_t_5) {
+      __pyx_t_5 = (__pyx_t_1 < (__pyx_v_self->dims[0]));
+    }
+    __pyx_t_2 = (!__pyx_t_5);
+    if (!__pyx_t_2) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":473
+ *             # but we are tracing on the grid, not on the data...
+ *             if (not (0 <= cur_ind[0] < self.dims[0])) or \
+ *                (not (0 <= cur_ind[1] < self.dims[1])) or \             # <<<<<<<<<<<<<<
+ *                (not (0 <= cur_ind[2] < self.dims[2])):
+ *                 break
+ */
+      __pyx_t_1 = (__pyx_v_cur_ind[1]);
+      __pyx_t_5 = (0 <= __pyx_t_1);
+      if (__pyx_t_5) {
+        __pyx_t_5 = (__pyx_t_1 < (__pyx_v_self->dims[1]));
+      }
+      __pyx_t_4 = (!__pyx_t_5);
+      if (!__pyx_t_4) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":474
+ *             if (not (0 <= cur_ind[0] < self.dims[0])) or \
+ *                (not (0 <= cur_ind[1] < self.dims[1])) or \
+ *                (not (0 <= cur_ind[2] < self.dims[2])):             # <<<<<<<<<<<<<<
+ *                 break
+ *             hit += 1
+ */
+        __pyx_t_1 = (__pyx_v_cur_ind[2]);
+        __pyx_t_5 = (0 <= __pyx_t_1);
+        if (__pyx_t_5) {
+          __pyx_t_5 = (__pyx_t_1 < (__pyx_v_self->dims[2]));
+        }
+        __pyx_t_6 = (!__pyx_t_5);
+        __pyx_t_5 = __pyx_t_6;
+      } else {
+        __pyx_t_5 = __pyx_t_4;
+      }
+      __pyx_t_4 = __pyx_t_5;
+    } else {
+      __pyx_t_4 = __pyx_t_2;
+    }
+    if (__pyx_t_4) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":475
+ *                (not (0 <= cur_ind[1] < self.dims[1])) or \
+ *                (not (0 <= cur_ind[2] < self.dims[2])):
+ *                 break             # <<<<<<<<<<<<<<
+ *             hit += 1
+ *             if tmax[0] < tmax[1]:
+ */
+      goto __pyx_L18_break;
+      goto __pyx_L19;
+    }
+    __pyx_L19:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":476
+ *                (not (0 <= cur_ind[2] < self.dims[2])):
+ *                 break
+ *             hit += 1             # <<<<<<<<<<<<<<
+ *             if tmax[0] < tmax[1]:
+ *                 if tmax[0] < tmax[2]:
+ */
+    __pyx_v_hit += 1;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":477
+ *                 break
+ *             hit += 1
+ *             if tmax[0] < tmax[1]:             # <<<<<<<<<<<<<<
+ *                 if tmax[0] < tmax[2]:
+ *                     exit_t = fmin(tmax[0], 1.0)
+ */
+    __pyx_t_4 = ((__pyx_v_tmax[0]) < (__pyx_v_tmax[1]));
+    if (__pyx_t_4) {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":478
+ *             hit += 1
+ *             if tmax[0] < tmax[1]:
+ *                 if tmax[0] < tmax[2]:             # <<<<<<<<<<<<<<
+ *                     exit_t = fmin(tmax[0], 1.0)
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ */
+      __pyx_t_4 = ((__pyx_v_tmax[0]) < (__pyx_v_tmax[2]));
+      if (__pyx_t_4) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":479
+ *             if tmax[0] < tmax[1]:
+ *                 if tmax[0] < tmax[2]:
+ *                     exit_t = fmin(tmax[0], 1.0)             # <<<<<<<<<<<<<<
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)
+ */
+        __pyx_v_exit_t = __pyx_f_2yt_9amr_utils_fmin((__pyx_v_tmax[0]), 1.0);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":481
+ *                     exit_t = fmin(tmax[0], 1.0)
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)             # <<<<<<<<<<<<<<
+ *                     cur_ind[0] += step[0]
+ *                     enter_t = tmax[0]
+ */
+        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self->__pyx_vtab)->sample_values(__pyx_v_self, __pyx_v_v_pos, __pyx_v_v_dir, __pyx_v_enter_t, __pyx_v_exit_t, __pyx_v_cur_ind, __pyx_v_rgba, __pyx_v_tf);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":482
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)
+ *                     cur_ind[0] += step[0]             # <<<<<<<<<<<<<<
+ *                     enter_t = tmax[0]
+ *                     tmax[0] += tdelta[0]
+ */
+        (__pyx_v_cur_ind[0]) += (__pyx_v_step[0]);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":483
+ *                                        rgba, tf)
+ *                     cur_ind[0] += step[0]
+ *                     enter_t = tmax[0]             # <<<<<<<<<<<<<<
+ *                     tmax[0] += tdelta[0]
+ *                 else:
+ */
+        __pyx_v_enter_t = (__pyx_v_tmax[0]);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":484
+ *                     cur_ind[0] += step[0]
+ *                     enter_t = tmax[0]
+ *                     tmax[0] += tdelta[0]             # <<<<<<<<<<<<<<
+ *                 else:
+ *                     exit_t = fmin(tmax[2], 1.0)
+ */
+        (__pyx_v_tmax[0]) += (__pyx_v_tdelta[0]);
+        goto __pyx_L21;
+      }
+      /*else*/ {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":486
+ *                     tmax[0] += tdelta[0]
+ *                 else:
+ *                     exit_t = fmin(tmax[2], 1.0)             # <<<<<<<<<<<<<<
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)
+ */
+        __pyx_v_exit_t = __pyx_f_2yt_9amr_utils_fmin((__pyx_v_tmax[2]), 1.0);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":488
+ *                     exit_t = fmin(tmax[2], 1.0)
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)             # <<<<<<<<<<<<<<
+ *                     cur_ind[2] += step[2]
+ *                     enter_t = tmax[2]
+ */
+        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self->__pyx_vtab)->sample_values(__pyx_v_self, __pyx_v_v_pos, __pyx_v_v_dir, __pyx_v_enter_t, __pyx_v_exit_t, __pyx_v_cur_ind, __pyx_v_rgba, __pyx_v_tf);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":489
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)
+ *                     cur_ind[2] += step[2]             # <<<<<<<<<<<<<<
+ *                     enter_t = tmax[2]
+ *                     tmax[2] += tdelta[2]
+ */
+        (__pyx_v_cur_ind[2]) += (__pyx_v_step[2]);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":490
+ *                                        rgba, tf)
+ *                     cur_ind[2] += step[2]
+ *                     enter_t = tmax[2]             # <<<<<<<<<<<<<<
+ *                     tmax[2] += tdelta[2]
+ *             else:
+ */
+        __pyx_v_enter_t = (__pyx_v_tmax[2]);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":491
+ *                     cur_ind[2] += step[2]
+ *                     enter_t = tmax[2]
+ *                     tmax[2] += tdelta[2]             # <<<<<<<<<<<<<<
+ *             else:
+ *                 if tmax[1] < tmax[2]:
+ */
+        (__pyx_v_tmax[2]) += (__pyx_v_tdelta[2]);
+      }
+      __pyx_L21:;
+      goto __pyx_L20;
+    }
+    /*else*/ {
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":493
+ *                     tmax[2] += tdelta[2]
+ *             else:
+ *                 if tmax[1] < tmax[2]:             # <<<<<<<<<<<<<<
+ *                     exit_t = fmin(tmax[1], 1.0)
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ */
+      __pyx_t_4 = ((__pyx_v_tmax[1]) < (__pyx_v_tmax[2]));
+      if (__pyx_t_4) {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":494
+ *             else:
+ *                 if tmax[1] < tmax[2]:
+ *                     exit_t = fmin(tmax[1], 1.0)             # <<<<<<<<<<<<<<
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)
+ */
+        __pyx_v_exit_t = __pyx_f_2yt_9amr_utils_fmin((__pyx_v_tmax[1]), 1.0);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":496
+ *                     exit_t = fmin(tmax[1], 1.0)
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)             # <<<<<<<<<<<<<<
+ *                     cur_ind[1] += step[1]
+ *                     enter_t = tmax[1]
+ */
+        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self->__pyx_vtab)->sample_values(__pyx_v_self, __pyx_v_v_pos, __pyx_v_v_dir, __pyx_v_enter_t, __pyx_v_exit_t, __pyx_v_cur_ind, __pyx_v_rgba, __pyx_v_tf);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":497
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)
+ *                     cur_ind[1] += step[1]             # <<<<<<<<<<<<<<
+ *                     enter_t = tmax[1]
+ *                     tmax[1] += tdelta[1]
+ */
+        (__pyx_v_cur_ind[1]) += (__pyx_v_step[1]);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":498
+ *                                        rgba, tf)
+ *                     cur_ind[1] += step[1]
+ *                     enter_t = tmax[1]             # <<<<<<<<<<<<<<
+ *                     tmax[1] += tdelta[1]
+ *                 else:
+ */
+        __pyx_v_enter_t = (__pyx_v_tmax[1]);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":499
+ *                     cur_ind[1] += step[1]
+ *                     enter_t = tmax[1]
+ *                     tmax[1] += tdelta[1]             # <<<<<<<<<<<<<<
+ *                 else:
+ *                     exit_t = fmin(tmax[2], 1.0)
+ */
+        (__pyx_v_tmax[1]) += (__pyx_v_tdelta[1]);
+        goto __pyx_L22;
+      }
+      /*else*/ {
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":501
+ *                     tmax[1] += tdelta[1]
+ *                 else:
+ *                     exit_t = fmin(tmax[2], 1.0)             # <<<<<<<<<<<<<<
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)
+ */
+        __pyx_v_exit_t = __pyx_f_2yt_9amr_utils_fmin((__pyx_v_tmax[2]), 1.0);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":503
+ *                     exit_t = fmin(tmax[2], 1.0)
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)             # <<<<<<<<<<<<<<
+ *                     cur_ind[2] += step[2]
+ *                     enter_t = tmax[2]
+ */
+        ((struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid *)__pyx_v_self->__pyx_vtab)->sample_values(__pyx_v_self, __pyx_v_v_pos, __pyx_v_v_dir, __pyx_v_enter_t, __pyx_v_exit_t, __pyx_v_cur_ind, __pyx_v_rgba, __pyx_v_tf);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":504
+ *                     self.sample_values(v_pos, v_dir, enter_t, exit_t, cur_ind,
+ *                                        rgba, tf)
+ *                     cur_ind[2] += step[2]             # <<<<<<<<<<<<<<
+ *                     enter_t = tmax[2]
+ *                     tmax[2] += tdelta[2]
+ */
+        (__pyx_v_cur_ind[2]) += (__pyx_v_step[2]);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":505
+ *                                        rgba, tf)
+ *                     cur_ind[2] += step[2]
+ *                     enter_t = tmax[2]             # <<<<<<<<<<<<<<
+ *                     tmax[2] += tdelta[2]
+ *             if enter_t > 1.0: break
+ */
+        __pyx_v_enter_t = (__pyx_v_tmax[2]);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":506
+ *                     cur_ind[2] += step[2]
+ *                     enter_t = tmax[2]
+ *                     tmax[2] += tdelta[2]             # <<<<<<<<<<<<<<
+ *             if enter_t > 1.0: break
+ *         return hit
+ */
+        (__pyx_v_tmax[2]) += (__pyx_v_tdelta[2]);
+      }
+      __pyx_L22:;
+    }
+    __pyx_L20:;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":507
+ *                     enter_t = tmax[2]
+ *                     tmax[2] += tdelta[2]
+ *             if enter_t > 1.0: break             # <<<<<<<<<<<<<<
+ *         return hit
+ * 
+ */
+    __pyx_t_4 = (__pyx_v_enter_t > 1.0);
+    if (__pyx_t_4) {
+      goto __pyx_L18_break;
+      goto __pyx_L23;
+    }
+    __pyx_L23:;
+  }
+  __pyx_L18_break:;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":508
+ *                     tmax[2] += tdelta[2]
+ *             if enter_t > 1.0: break
+ *         return hit             # <<<<<<<<<<<<<<
+ * 
+ *     @cython.boundscheck(False)
+ */
+  __pyx_r = __pyx_v_hit;
+  goto __pyx_L0;
+
+  __pyx_r = 0;
+  goto __pyx_L0;
+  __pyx_L1_error:;
+  __Pyx_WriteUnraisable("yt.amr_utils.PartitionedGrid.integrate_ray");
+  __pyx_r = 0;
+  __pyx_L0:;
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+ *         ypos = fmin(fmax((posy[n] - le1)*fact, 0.5001), edge1)             # <<<<<<<<<<<<<<
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+ *         zpos = fmin(fmax((posz[n] - le2)*fact, 0.5001), edge2)             # <<<<<<<<<<<<<<
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+ *         dy = (<float> j1) + 0.5 - ypos             # <<<<<<<<<<<<<<
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+ * @cython.boundscheck(False)
+ * def construct_boundary_relationships(             # <<<<<<<<<<<<<<
+ *         np.ndarray[dtype=np.int64_t, ndim=3] contour_ids):
+ *     # We only look at the boundary and one cell in
+ */
+
+static PyObject *__pyx_pf_2yt_9amr_utils_construct_boundary_relationships(PyObject *__pyx_self, PyObject *__pyx_v_contour_ids); /*proto*/
+static PyObject *__pyx_pf_2yt_9amr_utils_construct_boundary_relationships(PyObject *__pyx_self, PyObject *__pyx_v_contour_ids) {
+  int __pyx_v_i;
+  int __pyx_v_j;
+  int __pyx_v_nx;
+  int __pyx_v_ny;
+  int __pyx_v_nz;
+  int __pyx_v_offset_i;
+  int __pyx_v_offset_j;
+  int __pyx_v_oi;
+  int __pyx_v_oj;
+  __pyx_t_5numpy_int64_t __pyx_v_c1;
+  __pyx_t_5numpy_int64_t __pyx_v_c2;
+  PyObject *__pyx_v_tree;
+  Py_buffer __pyx_bstruct_contour_ids;
+  Py_ssize_t __pyx_bstride_0_contour_ids = 0;
+  Py_ssize_t __pyx_bstride_1_contour_ids = 0;
+  Py_ssize_t __pyx_bstride_2_contour_ids = 0;
+  Py_ssize_t __pyx_bshape_0_contour_ids = 0;
+  Py_ssize_t __pyx_bshape_1_contour_ids = 0;
+  Py_ssize_t __pyx_bshape_2_contour_ids = 0;
+  PyObject *__pyx_r = NULL;
+  PyObject *__pyx_t_1 = NULL;
+  int __pyx_t_2;
+  int __pyx_t_3;
+  int __pyx_t_4;
+  int __pyx_t_5;
+  int __pyx_t_6;
+  int __pyx_t_7;
+  int __pyx_t_8;
+  int __pyx_t_9;
+  int __pyx_t_10;
+  long __pyx_t_11;
+  int __pyx_t_12;
+  int __pyx_t_13;
+  long __pyx_t_14;
+  int __pyx_t_15;
+  int __pyx_t_16;
+  PyObject *__pyx_t_17 = NULL;
+  PyObject *__pyx_t_18 = NULL;
+  int __pyx_t_19;
+  long __pyx_t_20;
+  int __pyx_t_21;
+  long __pyx_t_22;
+  int __pyx_t_23;
+  int __pyx_t_24;
+  int __pyx_t_25;
+  long __pyx_t_26;
+  int __pyx_t_27;
+  int __pyx_t_28;
+  long __pyx_t_29;
+  int __pyx_t_30;
+  int __pyx_t_31;
+  long __pyx_t_32;
+  int __pyx_t_33;
+  int __pyx_t_34;
+  long __pyx_t_35;
+  int __pyx_t_36;
+  int __pyx_t_37;
+  int __pyx_t_38;
+  long __pyx_t_39;
+  int __pyx_t_40;
+  int __pyx_t_41;
+  long __pyx_t_42;
+  int __pyx_t_43;
+  int __pyx_t_44;
+  long __pyx_t_45;
+  int __pyx_t_46;
+  int __pyx_t_47;
+  long __pyx_t_48;
+  int __pyx_t_49;
+  __Pyx_RefNannySetupContext("construct_boundary_relationships");
+  __pyx_self = __pyx_self;
+  __pyx_v_tree = ((PyObject *)Py_None); __Pyx_INCREF(Py_None);
+  __pyx_bstruct_contour_ids.buf = NULL;
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_contour_ids), __pyx_ptype_5numpy_ndarray, 1, "contour_ids", 0))) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 43; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  {
+    __Pyx_BufFmt_StackElem __pyx_stack[1];
+    if (unlikely(__Pyx_GetBufferAndValidate(&__pyx_bstruct_contour_ids, (PyObject*)__pyx_v_contour_ids, &__Pyx_TypeInfo_nn___pyx_t_5numpy_int64_t, PyBUF_FORMAT| PyBUF_STRIDES, 3, 0, __pyx_stack) == -1)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 42; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  }
+  __pyx_bstride_0_contour_ids = __pyx_bstruct_contour_ids.strides[0]; __pyx_bstride_1_contour_ids = __pyx_bstruct_contour_ids.strides[1]; __pyx_bstride_2_contour_ids = __pyx_bstruct_contour_ids.strides[2];
+  __pyx_bshape_0_contour_ids = __pyx_bstruct_contour_ids.shape[0]; __pyx_bshape_1_contour_ids = __pyx_bstruct_contour_ids.shape[1]; __pyx_bshape_2_contour_ids = __pyx_bstruct_contour_ids.shape[2];
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":47
+ *     cdef int i, j, nx, ny, nz, offset_i, offset_j, oi, oj
+ *     cdef np.int64_t c1, c2
+ *     tree = []             # <<<<<<<<<<<<<<
+ *     nx = contour_ids.shape[0]
+ *     ny = contour_ids.shape[1]
+ */
+  __pyx_t_1 = PyList_New(0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 47; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(((PyObject *)__pyx_t_1));
+  __Pyx_DECREF(((PyObject *)__pyx_v_tree));
+  __pyx_v_tree = __pyx_t_1;
+  __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":48
+ *     cdef np.int64_t c1, c2
+ *     tree = []
+ *     nx = contour_ids.shape[0]             # <<<<<<<<<<<<<<
+ *     ny = contour_ids.shape[1]
+ *     nz = contour_ids.shape[2]
+ */
+  __pyx_v_nx = (((PyArrayObject *)__pyx_v_contour_ids)->dimensions[0]);
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":49
+ *     tree = []
+ *     nx = contour_ids.shape[0]
+ *     ny = contour_ids.shape[1]             # <<<<<<<<<<<<<<
+ *     nz = contour_ids.shape[2]
+ *     # First x-pass
+ */
+  __pyx_v_ny = (((PyArrayObject *)__pyx_v_contour_ids)->dimensions[1]);
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":50
+ *     nx = contour_ids.shape[0]
+ *     ny = contour_ids.shape[1]
+ *     nz = contour_ids.shape[2]             # <<<<<<<<<<<<<<
+ *     # First x-pass
+ *     for i in range(ny):
+ */
+  __pyx_v_nz = (((PyArrayObject *)__pyx_v_contour_ids)->dimensions[2]);
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":52
+ *     nz = contour_ids.shape[2]
+ *     # First x-pass
+ *     for i in range(ny):             # <<<<<<<<<<<<<<
+ *         for j in range(nz):
+ *             for offset_i in range(3):
+ */
+  __pyx_t_2 = __pyx_v_ny;
+  for (__pyx_t_3 = 0; __pyx_t_3 < __pyx_t_2; __pyx_t_3+=1) {
+    __pyx_v_i = __pyx_t_3;
+
+    /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":53
+ *     # First x-pass
+ *     for i in range(ny):
+ *         for j in range(nz):             # <<<<<<<<<<<<<<
+ *             for offset_i in range(3):
+ *                 oi = offset_i - 1
+ */
+    __pyx_t_4 = __pyx_v_nz;
+    for (__pyx_t_5 = 0; __pyx_t_5 < __pyx_t_4; __pyx_t_5+=1) {
+      __pyx_v_j = __pyx_t_5;
+
+      /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":54
+ *     for i in range(ny):
+ *         for j in range(nz):
+ *             for offset_i in range(3):             # <<<<<<<<<<<<<<
+ *                 oi = offset_i - 1
+ *                 if i == 0 and oi == -1: continue
+ */
+      for (__pyx_t_6 = 0; __pyx_t_6 < 3; __pyx_t_6+=1) {
+        __pyx_v_offset_i = __pyx_t_6;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":55
+ *         for j in range(nz):
+ *             for offset_i in range(3):
+ *                 oi = offset_i - 1             # <<<<<<<<<<<<<<
+ *                 if i == 0 and oi == -1: continue
+ *                 if i == ny - 1 and oj == 1: continue
+ */
+        __pyx_v_oi = (__pyx_v_offset_i - 1);
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":56
+ *             for offset_i in range(3):
+ *                 oi = offset_i - 1
+ *                 if i == 0 and oi == -1: continue             # <<<<<<<<<<<<<<
+ *                 if i == ny - 1 and oj == 1: continue
+ *                 for offset_j in range(3):
+ */
+        __pyx_t_7 = (__pyx_v_i == 0);
+        if (__pyx_t_7) {
+          __pyx_t_8 = (__pyx_v_oi == -1);
+          __pyx_t_9 = __pyx_t_8;
+        } else {
+          __pyx_t_9 = __pyx_t_7;
+        }
+        if (__pyx_t_9) {
+          goto __pyx_L9_continue;
+          goto __pyx_L11;
+        }
+        __pyx_L11:;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":57
+ *                 oi = offset_i - 1
+ *                 if i == 0 and oi == -1: continue
+ *                 if i == ny - 1 and oj == 1: continue             # <<<<<<<<<<<<<<
+ *                 for offset_j in range(3):
+ *                     oj = offset_j - 1
+ */
+        __pyx_t_9 = (__pyx_v_i == (__pyx_v_ny - 1));
+        if (__pyx_t_9) {
+          __pyx_t_7 = (__pyx_v_oj == 1);
+          __pyx_t_8 = __pyx_t_7;
+        } else {
+          __pyx_t_8 = __pyx_t_9;
+        }
+        if (__pyx_t_8) {
+          goto __pyx_L9_continue;
+          goto __pyx_L12;
+        }
+        __pyx_L12:;
+
+        /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":58
+ *                 if i == 0 and oi == -1: continue
+ *                 if i == ny - 1 and oj == 1: continue
+ *                 for offset_j in range(3):             # <<<<<<<<<<<<<<
+ *                     oj = offset_j - 1
+ *                     if j == 0 and oj == -1: continue
+ */
+        for (__pyx_t_10 = 0; __pyx_t_10 < 3; __pyx_t_10+=1) {
+          __pyx_v_offset_j = __pyx_t_10;
+
+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":59
+ *                 if i == ny - 1 and oj == 1: continue
+ *                 for offset_j in range(3):
+ *                     oj = offset_j - 1             # <<<<<<<<<<<<<<
+ *                     if j == 0 and oj == -1: continue
+ *                     if j == nz - 1 and oj == 1: continue
+ */
+          __pyx_v_oj = (__pyx_v_offset_j - 1);
+
+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":60
+ *                 for offset_j in range(3):
+ *                     oj = offset_j - 1
+ *                     if j == 0 and oj == -1: continue             # <<<<<<<<<<<<<<
+ *                     if j == nz - 1 and oj == 1: continue
+ *                     c1 = contour_ids[0, i, j]
+ */
+          __pyx_t_8 = (__pyx_v_j == 0);
+          if (__pyx_t_8) {
+            __pyx_t_9 = (__pyx_v_oj == -1);
+            __pyx_t_7 = __pyx_t_9;
+          } else {
+            __pyx_t_7 = __pyx_t_8;
+          }
+          if (__pyx_t_7) {
+            goto __pyx_L13_continue;
+            goto __pyx_L15;
+          }
+          __pyx_L15:;
+
+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":61
+ *                     oj = offset_j - 1
+ *                     if j == 0 and oj == -1: continue
+ *                     if j == nz - 1 and oj == 1: continue             # <<<<<<<<<<<<<<
+ *                     c1 = contour_ids[0, i, j]
+ *                     c2 = contour_ids[1, i + oi, j + oj]
+ */
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+          if (__pyx_t_7) {
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+            goto __pyx_L13_continue;
+            goto __pyx_L16;
+          }
+          __pyx_L16:;
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+ *                     if j == 0 and oj == -1: continue
+ *                     if j == nz - 1 and oj == 1: continue
+ *                     c1 = contour_ids[0, i, j]             # <<<<<<<<<<<<<<
+ *                     c2 = contour_ids[1, i + oi, j + oj]
+ *                     if c1 > -1 and c2 > -1:
+ */
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+          __pyx_t_13 = __pyx_v_j;
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+          if (__pyx_t_12 < 0) __pyx_t_12 += __pyx_bshape_1_contour_ids;
+          if (__pyx_t_13 < 0) __pyx_t_13 += __pyx_bshape_2_contour_ids;
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+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":63
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+          __pyx_t_15 = (__pyx_v_i + __pyx_v_oi);
+          __pyx_t_16 = (__pyx_v_j + __pyx_v_oj);
+          if (__pyx_t_14 < 0) __pyx_t_14 += __pyx_bshape_0_contour_ids;
+          if (__pyx_t_15 < 0) __pyx_t_15 += __pyx_bshape_1_contour_ids;
+          if (__pyx_t_16 < 0) __pyx_t_16 += __pyx_bshape_2_contour_ids;
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+
+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":64
+ *                     c1 = contour_ids[0, i, j]
+ *                     c2 = contour_ids[1, i + oi, j + oj]
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+ */
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+            __pyx_t_8 = __pyx_t_7;
+          } else {
+            __pyx_t_8 = __pyx_t_9;
+          }
+          if (__pyx_t_8) {
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":65
+ *                     c2 = contour_ids[1, i + oi, j + oj]
+ *                     if c1 > -1 and c2 > -1:
+ *                         tree.append((i64max(c1,c2), i64min(c1,c2)))             # <<<<<<<<<<<<<<
+ *                     c1 = contour_ids[nx-1, i, j]
+ *                     c2 = contour_ids[nx-2, i + oi, j + oj]
+ */
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+            }
+            __pyx_t_1 = __Pyx_PyInt_to_py_npy_int64(__pyx_f_2yt_9amr_utils_i64max(__pyx_v_c1, __pyx_v_c2)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+            __Pyx_GOTREF(__pyx_t_1);
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+            __Pyx_GOTREF(__pyx_t_17);
+            __pyx_t_18 = PyTuple_New(2); if (unlikely(!__pyx_t_18)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+            __Pyx_GOTREF(__pyx_t_18);
+            PyTuple_SET_ITEM(__pyx_t_18, 0, __pyx_t_1);
+            __Pyx_GIVEREF(__pyx_t_1);
+            PyTuple_SET_ITEM(__pyx_t_18, 1, __pyx_t_17);
+            __Pyx_GIVEREF(__pyx_t_17);
+            __pyx_t_1 = 0;
+            __pyx_t_17 = 0;
+            __pyx_t_19 = PyList_Append(((PyObject *)__pyx_v_tree), __pyx_t_18); if (unlikely(__pyx_t_19 == -1)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 65; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+            __Pyx_DECREF(__pyx_t_18); __pyx_t_18 = 0;
+            goto __pyx_L17;
+          }
+          __pyx_L17:;
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+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":66
+ *                     if c1 > -1 and c2 > -1:
+ *                         tree.append((i64max(c1,c2), i64min(c1,c2)))
+ *                     c1 = contour_ids[nx-1, i, j]             # <<<<<<<<<<<<<<
+ *                     c2 = contour_ids[nx-2, i + oi, j + oj]
+ *                     if c1 > -1 and c2 > -1:
+ */
+          __pyx_t_20 = (__pyx_v_nx - 1);
+          __pyx_t_19 = __pyx_v_i;
+          __pyx_t_21 = __pyx_v_j;
+          if (__pyx_t_20 < 0) __pyx_t_20 += __pyx_bshape_0_contour_ids;
+          if (__pyx_t_19 < 0) __pyx_t_19 += __pyx_bshape_1_contour_ids;
+          if (__pyx_t_21 < 0) __pyx_t_21 += __pyx_bshape_2_contour_ids;
+          __pyx_v_c1 = (*__Pyx_BufPtrStrided3d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_contour_ids.buf, __pyx_t_20, __pyx_bstride_0_contour_ids, __pyx_t_19, __pyx_bstride_1_contour_ids, __pyx_t_21, __pyx_bstride_2_contour_ids));
+
+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":67
+ *                         tree.append((i64max(c1,c2), i64min(c1,c2)))
+ *                     c1 = contour_ids[nx-1, i, j]
+ *                     c2 = contour_ids[nx-2, i + oi, j + oj]             # <<<<<<<<<<<<<<
+ *                     if c1 > -1 and c2 > -1:
+ *                         tree.append((i64max(c1,c2), i64min(c1,c2)))
+ */
+          __pyx_t_22 = (__pyx_v_nx - 2);
+          __pyx_t_23 = (__pyx_v_i + __pyx_v_oi);
+          __pyx_t_24 = (__pyx_v_j + __pyx_v_oj);
+          if (__pyx_t_22 < 0) __pyx_t_22 += __pyx_bshape_0_contour_ids;
+          if (__pyx_t_23 < 0) __pyx_t_23 += __pyx_bshape_1_contour_ids;
+          if (__pyx_t_24 < 0) __pyx_t_24 += __pyx_bshape_2_contour_ids;
+          __pyx_v_c2 = (*__Pyx_BufPtrStrided3d(__pyx_t_5numpy_int64_t *, __pyx_bstruct_contour_ids.buf, __pyx_t_22, __pyx_bstride_0_contour_ids, __pyx_t_23, __pyx_bstride_1_contour_ids, __pyx_t_24, __pyx_bstride_2_contour_ids));
+
+          /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":68
+ *                     c1 = contour_ids[nx-1, i, j]
+ *                     c2 = contour_ids[nx-2, i + oi, j + oj]
+ *                     if c1 > -1 and c2 > -1:             # <<<<<<<<<<<<<<
+ *                         tree.append((i64max(c1,c2), i64min(c1,c2)))
+ *     # Now y-pass
+ */
+          __pyx_t_8 = (__pyx_v_c1 > -1);
+          if (__pyx_t_8) {
+            __pyx_t_9 = (__pyx_v_c2 > -1);
+            __pyx_t_7 = __pyx_t_9;
+          } else {
+            __pyx_t_7 = __pyx_t_8;
+          }
+          if (__pyx_t_7) {
+
+            /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":69
+ *                     c2 = contour_ids[nx-2, i + oi, j + oj]
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+static  int __pyx_f_2yt_9amr_utils_8QuadTree_fill_from_level(struct __pyx_obj_2yt_9amr_utils_QuadTree *__pyx_v_self, struct __pyx_t_2yt_9amr_utils_QuadTreeNode *__pyx_v_node, int __pyx_v_level, __pyx_t_5numpy_int64_t __pyx_v_curpos, __pyx_t_5numpy_int64_t *__pyx_v_pdata, __pyx_t_5numpy_float64_t *__pyx_v_vdata, __pyx_t_5numpy_float64_t *__pyx_v_wdata) {
+  int __pyx_v_i;
+  int __pyx_v_j;
+  __pyx_t_5numpy_int64_t __pyx_v_added;
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+  &__pyx_tp_as_buffer_position, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_9amr_utils_position, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_2yt_9amr_utils_position, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_9amr_utils_position, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_2yt_9amr_utils_OctreeGrid(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_2yt_9amr_utils_OctreeGrid *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_2yt_9amr_utils_OctreeGrid *)o);
+  p->child_indices = Py_None; Py_INCREF(Py_None);
+  p->fields = Py_None; Py_INCREF(Py_None);
+  p->left_edges = Py_None; Py_INCREF(Py_None);
+  p->dimensions = Py_None; Py_INCREF(Py_None);
+  p->dx = Py_None; Py_INCREF(Py_None);
+  if (__pyx_pf_2yt_9amr_utils_10OctreeGrid___cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static void __pyx_tp_dealloc_2yt_9amr_utils_OctreeGrid(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_OctreeGrid *p = (struct __pyx_obj_2yt_9amr_utils_OctreeGrid *)o;
+  Py_XDECREF(p->child_indices);
+  Py_XDECREF(p->fields);
+  Py_XDECREF(p->left_edges);
+  Py_XDECREF(p->dimensions);
+  Py_XDECREF(p->dx);
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_2yt_9amr_utils_OctreeGrid(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_2yt_9amr_utils_OctreeGrid *p = (struct __pyx_obj_2yt_9amr_utils_OctreeGrid *)o;
+  if (p->child_indices) {
+    e = (*v)(p->child_indices, a); if (e) return e;
+  }
+  if (p->fields) {
+    e = (*v)(p->fields, a); if (e) return e;
+  }
+  if (p->left_edges) {
+    e = (*v)(p->left_edges, a); if (e) return e;
+  }
+  if (p->dimensions) {
+    e = (*v)(p->dimensions, a); if (e) return e;
+  }
+  if (p->dx) {
+    e = (*v)(p->dx, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_2yt_9amr_utils_OctreeGrid(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_OctreeGrid *p = (struct __pyx_obj_2yt_9amr_utils_OctreeGrid *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->child_indices);
+  p->child_indices = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->fields);
+  p->fields = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->left_edges);
+  p->left_edges = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->dimensions);
+  p->dimensions = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->dx);
+  p->dx = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10OctreeGrid_child_indices(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10OctreeGrid_13child_indices___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10OctreeGrid_child_indices(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_13child_indices___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_13child_indices___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10OctreeGrid_fields(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10OctreeGrid_6fields___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10OctreeGrid_fields(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_6fields___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_6fields___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10OctreeGrid_left_edges(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10OctreeGrid_10left_edges___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10OctreeGrid_left_edges(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_10left_edges___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_10left_edges___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10OctreeGrid_dimensions(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10OctreeGrid_10dimensions___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10OctreeGrid_dimensions(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_10dimensions___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_10dimensions___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10OctreeGrid_dx(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10OctreeGrid_2dx___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10OctreeGrid_dx(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_2dx___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_2dx___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10OctreeGrid_level(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10OctreeGrid_5level___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10OctreeGrid_level(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10OctreeGrid_5level___set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyMethodDef __pyx_methods_2yt_9amr_utils_OctreeGrid[] = {
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_OctreeGrid[] = {
+  {(char *)"child_indices", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_child_indices, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_child_indices, 0, 0},
+  {(char *)"fields", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_fields, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_fields, 0, 0},
+  {(char *)"left_edges", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_left_edges, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_left_edges, 0, 0},
+  {(char *)"dimensions", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_dimensions, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_dimensions, 0, 0},
+  {(char *)"dx", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_dx, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_dx, 0, 0},
+  {(char *)"level", __pyx_getprop_2yt_9amr_utils_10OctreeGrid_level, __pyx_setprop_2yt_9amr_utils_10OctreeGrid_level, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_OctreeGrid = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*nb_long*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_OctreeGrid = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_OctreeGrid = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_OctreeGrid = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+PyTypeObject __pyx_type_2yt_9amr_utils_OctreeGrid = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("yt.amr_utils.OctreeGrid"), /*tp_name*/
+  sizeof(struct __pyx_obj_2yt_9amr_utils_OctreeGrid), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_2yt_9amr_utils_OctreeGrid, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*tp_compare*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_OctreeGrid, /*tp_as_number*/
+  &__pyx_tp_as_sequence_OctreeGrid, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_OctreeGrid, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_OctreeGrid, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_2yt_9amr_utils_OctreeGrid, /*tp_traverse*/
+  __pyx_tp_clear_2yt_9amr_utils_OctreeGrid, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_9amr_utils_OctreeGrid, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_2yt_9amr_utils_OctreeGrid, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_9amr_utils_OctreeGrid, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+
+static PyObject *__pyx_tp_new_2yt_9amr_utils_OctreeGridList(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_2yt_9amr_utils_OctreeGridList *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_2yt_9amr_utils_OctreeGridList *)o);
+  p->grids = Py_None; Py_INCREF(Py_None);
+  if (__pyx_pf_2yt_9amr_utils_14OctreeGridList___cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static void __pyx_tp_dealloc_2yt_9amr_utils_OctreeGridList(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_OctreeGridList *p = (struct __pyx_obj_2yt_9amr_utils_OctreeGridList *)o;
+  Py_XDECREF(p->grids);
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_2yt_9amr_utils_OctreeGridList(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_2yt_9amr_utils_OctreeGridList *p = (struct __pyx_obj_2yt_9amr_utils_OctreeGridList *)o;
+  if (p->grids) {
+    e = (*v)(p->grids, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_2yt_9amr_utils_OctreeGridList(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_OctreeGridList *p = (struct __pyx_obj_2yt_9amr_utils_OctreeGridList *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->grids);
+  p->grids = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+static PyObject *__pyx_sq_item_2yt_9amr_utils_OctreeGridList(PyObject *o, Py_ssize_t i) {
+  PyObject *r;
+  PyObject *x = PyInt_FromSsize_t(i); if(!x) return 0;
+  r = Py_TYPE(o)->tp_as_mapping->mp_subscript(o, x);
+  Py_DECREF(x);
+  return r;
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_14OctreeGridList_grids(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_14OctreeGridList_5grids___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_14OctreeGridList_grids(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_14OctreeGridList_5grids___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_14OctreeGridList_5grids___del__(o);
+  }
+}
+
+static PyMethodDef __pyx_methods_2yt_9amr_utils_OctreeGridList[] = {
+  {__Pyx_NAMESTR("__getitem__"), (PyCFunction)__pyx_pf_2yt_9amr_utils_14OctreeGridList___getitem__, METH_O|METH_COEXIST, __Pyx_DOCSTR(0)},
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_OctreeGridList[] = {
+  {(char *)"grids", __pyx_getprop_2yt_9amr_utils_14OctreeGridList_grids, __pyx_setprop_2yt_9amr_utils_14OctreeGridList_grids, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_OctreeGridList = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*nb_long*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_OctreeGridList = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  __pyx_sq_item_2yt_9amr_utils_OctreeGridList, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_OctreeGridList = {
+  0, /*mp_length*/
+  __pyx_pf_2yt_9amr_utils_14OctreeGridList___getitem__, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_OctreeGridList = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+PyTypeObject __pyx_type_2yt_9amr_utils_OctreeGridList = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("yt.amr_utils.OctreeGridList"), /*tp_name*/
+  sizeof(struct __pyx_obj_2yt_9amr_utils_OctreeGridList), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_2yt_9amr_utils_OctreeGridList, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*tp_compare*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_OctreeGridList, /*tp_as_number*/
+  &__pyx_tp_as_sequence_OctreeGridList, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_OctreeGridList, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_OctreeGridList, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_2yt_9amr_utils_OctreeGridList, /*tp_traverse*/
+  __pyx_tp_clear_2yt_9amr_utils_OctreeGridList, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_9amr_utils_OctreeGridList, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_2yt_9amr_utils_OctreeGridList, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_9amr_utils_OctreeGridList, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_VectorPlane __pyx_vtable_2yt_9amr_utils_VectorPlane;
+
+static PyObject *__pyx_tp_new_2yt_9amr_utils_VectorPlane(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_2yt_9amr_utils_VectorPlane *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_2yt_9amr_utils_VectorPlane *)o);
+  p->__pyx_vtab = __pyx_vtabptr_2yt_9amr_utils_VectorPlane;
+  p->avp_pos = Py_None; Py_INCREF(Py_None);
+  p->avp_dir = Py_None; Py_INCREF(Py_None);
+  p->acenter = Py_None; Py_INCREF(Py_None);
+  p->aimage = Py_None; Py_INCREF(Py_None);
+  p->ax_vec = Py_None; Py_INCREF(Py_None);
+  p->ay_vec = Py_None; Py_INCREF(Py_None);
+  if (__pyx_pf_2yt_9amr_utils_11VectorPlane___cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static void __pyx_tp_dealloc_2yt_9amr_utils_VectorPlane(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_VectorPlane *p = (struct __pyx_obj_2yt_9amr_utils_VectorPlane *)o;
+  Py_XDECREF(p->avp_pos);
+  Py_XDECREF(p->avp_dir);
+  Py_XDECREF(p->acenter);
+  Py_XDECREF(p->aimage);
+  Py_XDECREF(p->ax_vec);
+  Py_XDECREF(p->ay_vec);
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_2yt_9amr_utils_VectorPlane(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_2yt_9amr_utils_VectorPlane *p = (struct __pyx_obj_2yt_9amr_utils_VectorPlane *)o;
+  if (p->avp_pos) {
+    e = (*v)(p->avp_pos, a); if (e) return e;
+  }
+  if (p->avp_dir) {
+    e = (*v)(p->avp_dir, a); if (e) return e;
+  }
+  if (p->acenter) {
+    e = (*v)(p->acenter, a); if (e) return e;
+  }
+  if (p->aimage) {
+    e = (*v)(p->aimage, a); if (e) return e;
+  }
+  if (p->ax_vec) {
+    e = (*v)(p->ax_vec, a); if (e) return e;
+  }
+  if (p->ay_vec) {
+    e = (*v)(p->ay_vec, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_2yt_9amr_utils_VectorPlane(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_VectorPlane *p = (struct __pyx_obj_2yt_9amr_utils_VectorPlane *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->avp_pos);
+  p->avp_pos = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->avp_dir);
+  p->avp_dir = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->acenter);
+  p->acenter = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->aimage);
+  p->aimage = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->ax_vec);
+  p->ax_vec = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->ay_vec);
+  p->ay_vec = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_avp_pos(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_11VectorPlane_7avp_pos___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_avp_pos(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_7avp_pos___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_7avp_pos___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_avp_dir(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_11VectorPlane_7avp_dir___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_avp_dir(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_7avp_dir___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_7avp_dir___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_acenter(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_11VectorPlane_7acenter___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_acenter(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_7acenter___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_7acenter___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_aimage(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_11VectorPlane_6aimage___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_aimage(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6aimage___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6aimage___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_ax_vec(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ax_vec___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_ax_vec(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ax_vec___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ax_vec___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_11VectorPlane_ay_vec(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ay_vec___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_11VectorPlane_ay_vec(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ay_vec___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_11VectorPlane_6ay_vec___del__(o);
+  }
+}
+
+static PyMethodDef __pyx_methods_2yt_9amr_utils_VectorPlane[] = {
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_VectorPlane[] = {
+  {(char *)"avp_pos", __pyx_getprop_2yt_9amr_utils_11VectorPlane_avp_pos, __pyx_setprop_2yt_9amr_utils_11VectorPlane_avp_pos, 0, 0},
+  {(char *)"avp_dir", __pyx_getprop_2yt_9amr_utils_11VectorPlane_avp_dir, __pyx_setprop_2yt_9amr_utils_11VectorPlane_avp_dir, 0, 0},
+  {(char *)"acenter", __pyx_getprop_2yt_9amr_utils_11VectorPlane_acenter, __pyx_setprop_2yt_9amr_utils_11VectorPlane_acenter, 0, 0},
+  {(char *)"aimage", __pyx_getprop_2yt_9amr_utils_11VectorPlane_aimage, __pyx_setprop_2yt_9amr_utils_11VectorPlane_aimage, 0, 0},
+  {(char *)"ax_vec", __pyx_getprop_2yt_9amr_utils_11VectorPlane_ax_vec, __pyx_setprop_2yt_9amr_utils_11VectorPlane_ax_vec, 0, 0},
+  {(char *)"ay_vec", __pyx_getprop_2yt_9amr_utils_11VectorPlane_ay_vec, __pyx_setprop_2yt_9amr_utils_11VectorPlane_ay_vec, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_VectorPlane = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*nb_long*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_VectorPlane = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_VectorPlane = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_VectorPlane = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+PyTypeObject __pyx_type_2yt_9amr_utils_VectorPlane = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("yt.amr_utils.VectorPlane"), /*tp_name*/
+  sizeof(struct __pyx_obj_2yt_9amr_utils_VectorPlane), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_2yt_9amr_utils_VectorPlane, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*tp_compare*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_VectorPlane, /*tp_as_number*/
+  &__pyx_tp_as_sequence_VectorPlane, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_VectorPlane, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_VectorPlane, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_2yt_9amr_utils_VectorPlane, /*tp_traverse*/
+  __pyx_tp_clear_2yt_9amr_utils_VectorPlane, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_9amr_utils_VectorPlane, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_2yt_9amr_utils_VectorPlane, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_9amr_utils_VectorPlane, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_TransferFunctionProxy __pyx_vtable_2yt_9amr_utils_TransferFunctionProxy;
+
+static PyObject *__pyx_tp_new_2yt_9amr_utils_TransferFunctionProxy(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *)o);
+  p->__pyx_vtab = __pyx_vtabptr_2yt_9amr_utils_TransferFunctionProxy;
+  p->tf_obj = Py_None; Py_INCREF(Py_None);
+  p->my_field_tables = Py_None; Py_INCREF(Py_None);
+  if (__pyx_pf_2yt_9amr_utils_21TransferFunctionProxy___cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static void __pyx_tp_dealloc_2yt_9amr_utils_TransferFunctionProxy(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *p = (struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *)o;
+  Py_XDECREF(p->tf_obj);
+  Py_XDECREF(p->my_field_tables);
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_2yt_9amr_utils_TransferFunctionProxy(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *p = (struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *)o;
+  if (p->tf_obj) {
+    e = (*v)(p->tf_obj, a); if (e) return e;
+  }
+  if (p->my_field_tables) {
+    e = (*v)(p->my_field_tables, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_2yt_9amr_utils_TransferFunctionProxy(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *p = (struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->tf_obj);
+  p->tf_obj = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->my_field_tables);
+  p->my_field_tables = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_21TransferFunctionProxy_ns(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_2ns___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_21TransferFunctionProxy_ns(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_2ns___set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_21TransferFunctionProxy_tf_obj(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_6tf_obj___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_21TransferFunctionProxy_tf_obj(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_6tf_obj___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_6tf_obj___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_21TransferFunctionProxy_my_field_tables(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_15my_field_tables___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_21TransferFunctionProxy_my_field_tables(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_15my_field_tables___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_21TransferFunctionProxy_15my_field_tables___del__(o);
+  }
+}
+
+static PyMethodDef __pyx_methods_2yt_9amr_utils_TransferFunctionProxy[] = {
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_TransferFunctionProxy[] = {
+  {(char *)"ns", __pyx_getprop_2yt_9amr_utils_21TransferFunctionProxy_ns, __pyx_setprop_2yt_9amr_utils_21TransferFunctionProxy_ns, 0, 0},
+  {(char *)"tf_obj", __pyx_getprop_2yt_9amr_utils_21TransferFunctionProxy_tf_obj, __pyx_setprop_2yt_9amr_utils_21TransferFunctionProxy_tf_obj, 0, 0},
+  {(char *)"my_field_tables", __pyx_getprop_2yt_9amr_utils_21TransferFunctionProxy_my_field_tables, __pyx_setprop_2yt_9amr_utils_21TransferFunctionProxy_my_field_tables, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_TransferFunctionProxy = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*nb_long*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_TransferFunctionProxy = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_TransferFunctionProxy = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_TransferFunctionProxy = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+PyTypeObject __pyx_type_2yt_9amr_utils_TransferFunctionProxy = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("yt.amr_utils.TransferFunctionProxy"), /*tp_name*/
+  sizeof(struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_2yt_9amr_utils_TransferFunctionProxy, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*tp_compare*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_TransferFunctionProxy, /*tp_as_number*/
+  &__pyx_tp_as_sequence_TransferFunctionProxy, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_TransferFunctionProxy, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_TransferFunctionProxy, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_2yt_9amr_utils_TransferFunctionProxy, /*tp_traverse*/
+  __pyx_tp_clear_2yt_9amr_utils_TransferFunctionProxy, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_9amr_utils_TransferFunctionProxy, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_2yt_9amr_utils_TransferFunctionProxy, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_9amr_utils_TransferFunctionProxy, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_PartitionedGrid __pyx_vtable_2yt_9amr_utils_PartitionedGrid;
+
+static PyObject *__pyx_tp_new_2yt_9amr_utils_PartitionedGrid(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)o);
+  p->__pyx_vtab = __pyx_vtabptr_2yt_9amr_utils_PartitionedGrid;
+  p->my_data = Py_None; Py_INCREF(Py_None);
+  p->LeftEdge = Py_None; Py_INCREF(Py_None);
+  p->RightEdge = Py_None; Py_INCREF(Py_None);
+  if (__pyx_pf_2yt_9amr_utils_15PartitionedGrid___cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static void __pyx_tp_dealloc_2yt_9amr_utils_PartitionedGrid(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *p = (struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)o;
+  Py_XDECREF(p->my_data);
+  Py_XDECREF(p->LeftEdge);
+  Py_XDECREF(p->RightEdge);
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_2yt_9amr_utils_PartitionedGrid(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *p = (struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)o;
+  if (p->my_data) {
+    e = (*v)(p->my_data, a); if (e) return e;
+  }
+  if (p->LeftEdge) {
+    e = (*v)(p->LeftEdge, a); if (e) return e;
+  }
+  if (p->RightEdge) {
+    e = (*v)(p->RightEdge, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_2yt_9amr_utils_PartitionedGrid(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *p = (struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->my_data);
+  p->my_data = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->LeftEdge);
+  p->LeftEdge = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->RightEdge);
+  p->RightEdge = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_15PartitionedGrid_my_data(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_7my_data___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_my_data(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_7my_data___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_7my_data___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_15PartitionedGrid_LeftEdge(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_8LeftEdge___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_LeftEdge(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_8LeftEdge___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_8LeftEdge___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_15PartitionedGrid_RightEdge(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_9RightEdge___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_RightEdge(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_9RightEdge___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_9RightEdge___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_15PartitionedGrid_parent_grid_id(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_14parent_grid_id___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_parent_grid_id(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_14parent_grid_id___set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_15PartitionedGrid_n_fields(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_8n_fields___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_n_fields(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_15PartitionedGrid_8n_fields___set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyMethodDef __pyx_methods_2yt_9amr_utils_PartitionedGrid[] = {
+  {__Pyx_NAMESTR("cast_plane"), (PyCFunction)__pyx_pf_2yt_9amr_utils_15PartitionedGrid_cast_plane, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_PartitionedGrid[] = {
+  {(char *)"my_data", __pyx_getprop_2yt_9amr_utils_15PartitionedGrid_my_data, __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_my_data, 0, 0},
+  {(char *)"LeftEdge", __pyx_getprop_2yt_9amr_utils_15PartitionedGrid_LeftEdge, __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_LeftEdge, 0, 0},
+  {(char *)"RightEdge", __pyx_getprop_2yt_9amr_utils_15PartitionedGrid_RightEdge, __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_RightEdge, 0, 0},
+  {(char *)"parent_grid_id", __pyx_getprop_2yt_9amr_utils_15PartitionedGrid_parent_grid_id, __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_parent_grid_id, 0, 0},
+  {(char *)"n_fields", __pyx_getprop_2yt_9amr_utils_15PartitionedGrid_n_fields, __pyx_setprop_2yt_9amr_utils_15PartitionedGrid_n_fields, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_PartitionedGrid = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*nb_long*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_PartitionedGrid = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_PartitionedGrid = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_PartitionedGrid = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+PyTypeObject __pyx_type_2yt_9amr_utils_PartitionedGrid = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("yt.amr_utils.PartitionedGrid"), /*tp_name*/
+  sizeof(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_2yt_9amr_utils_PartitionedGrid, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*tp_compare*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_PartitionedGrid, /*tp_as_number*/
+  &__pyx_tp_as_sequence_PartitionedGrid, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_PartitionedGrid, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_PartitionedGrid, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_2yt_9amr_utils_PartitionedGrid, /*tp_traverse*/
+  __pyx_tp_clear_2yt_9amr_utils_PartitionedGrid, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_9amr_utils_PartitionedGrid, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_2yt_9amr_utils_PartitionedGrid, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_9amr_utils_PartitionedGrid, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_GridFace __pyx_vtable_2yt_9amr_utils_GridFace;
+
+static PyObject *__pyx_tp_new_2yt_9amr_utils_GridFace(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_2yt_9amr_utils_GridFace *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_2yt_9amr_utils_GridFace *)o);
+  p->__pyx_vtab = __pyx_vtabptr_2yt_9amr_utils_GridFace;
+  return o;
+}
+
+static void __pyx_tp_dealloc_2yt_9amr_utils_GridFace(PyObject *o) {
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_8GridFace_coord(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_8GridFace_5coord___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_8GridFace_coord(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_8GridFace_5coord___set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyMethodDef __pyx_methods_2yt_9amr_utils_GridFace[] = {
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_GridFace[] = {
+  {(char *)"coord", __pyx_getprop_2yt_9amr_utils_8GridFace_coord, __pyx_setprop_2yt_9amr_utils_8GridFace_coord, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_GridFace = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*nb_long*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_GridFace = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_GridFace = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_GridFace = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+PyTypeObject __pyx_type_2yt_9amr_utils_GridFace = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("yt.amr_utils.GridFace"), /*tp_name*/
+  sizeof(struct __pyx_obj_2yt_9amr_utils_GridFace), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_2yt_9amr_utils_GridFace, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*tp_compare*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_GridFace, /*tp_as_number*/
+  &__pyx_tp_as_sequence_GridFace, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_GridFace, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_GridFace, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_9amr_utils_GridFace, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_2yt_9amr_utils_GridFace, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  __pyx_pf_2yt_9amr_utils_8GridFace___init__, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_9amr_utils_GridFace, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_ProtoPrism __pyx_vtable_2yt_9amr_utils_ProtoPrism;
+
+static PyObject *__pyx_tp_new_2yt_9amr_utils_ProtoPrism(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_2yt_9amr_utils_ProtoPrism *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_2yt_9amr_utils_ProtoPrism *)o);
+  p->__pyx_vtab = __pyx_vtabptr_2yt_9amr_utils_ProtoPrism;
+  p->LeftEdge = Py_None; Py_INCREF(Py_None);
+  p->RightEdge = Py_None; Py_INCREF(Py_None);
+  p->subgrid_faces = Py_None; Py_INCREF(Py_None);
+  if (__pyx_pf_2yt_9amr_utils_10ProtoPrism___cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static void __pyx_tp_dealloc_2yt_9amr_utils_ProtoPrism(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_ProtoPrism *p = (struct __pyx_obj_2yt_9amr_utils_ProtoPrism *)o;
+  Py_XDECREF(p->LeftEdge);
+  Py_XDECREF(p->RightEdge);
+  Py_XDECREF(p->subgrid_faces);
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static int __pyx_tp_traverse_2yt_9amr_utils_ProtoPrism(PyObject *o, visitproc v, void *a) {
+  int e;
+  struct __pyx_obj_2yt_9amr_utils_ProtoPrism *p = (struct __pyx_obj_2yt_9amr_utils_ProtoPrism *)o;
+  if (p->LeftEdge) {
+    e = (*v)(p->LeftEdge, a); if (e) return e;
+  }
+  if (p->RightEdge) {
+    e = (*v)(p->RightEdge, a); if (e) return e;
+  }
+  if (p->subgrid_faces) {
+    e = (*v)(p->subgrid_faces, a); if (e) return e;
+  }
+  return 0;
+}
+
+static int __pyx_tp_clear_2yt_9amr_utils_ProtoPrism(PyObject *o) {
+  struct __pyx_obj_2yt_9amr_utils_ProtoPrism *p = (struct __pyx_obj_2yt_9amr_utils_ProtoPrism *)o;
+  PyObject* tmp;
+  tmp = ((PyObject*)p->LeftEdge);
+  p->LeftEdge = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->RightEdge);
+  p->RightEdge = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  tmp = ((PyObject*)p->subgrid_faces);
+  p->subgrid_faces = Py_None; Py_INCREF(Py_None);
+  Py_XDECREF(tmp);
+  return 0;
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10ProtoPrism_LeftEdge(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10ProtoPrism_8LeftEdge___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10ProtoPrism_LeftEdge(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10ProtoPrism_8LeftEdge___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_10ProtoPrism_8LeftEdge___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10ProtoPrism_RightEdge(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10ProtoPrism_9RightEdge___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10ProtoPrism_RightEdge(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10ProtoPrism_9RightEdge___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_10ProtoPrism_9RightEdge___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10ProtoPrism_subgrid_faces(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10ProtoPrism_13subgrid_faces___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10ProtoPrism_subgrid_faces(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10ProtoPrism_13subgrid_faces___set__(o, v);
+  }
+  else {
+    return __pyx_pf_2yt_9amr_utils_10ProtoPrism_13subgrid_faces___del__(o);
+  }
+}
+
+static PyObject *__pyx_getprop_2yt_9amr_utils_10ProtoPrism_parent_grid_id(PyObject *o, void *x) {
+  return __pyx_pf_2yt_9amr_utils_10ProtoPrism_14parent_grid_id___get__(o);
+}
+
+static int __pyx_setprop_2yt_9amr_utils_10ProtoPrism_parent_grid_id(PyObject *o, PyObject *v, void *x) {
+  if (v) {
+    return __pyx_pf_2yt_9amr_utils_10ProtoPrism_14parent_grid_id___set__(o, v);
+  }
+  else {
+    PyErr_SetString(PyExc_NotImplementedError, "__del__");
+    return -1;
+  }
+}
+
+static PyMethodDef __pyx_methods_2yt_9amr_utils_ProtoPrism[] = {
+  {__Pyx_NAMESTR("sweep"), (PyCFunction)__pyx_pf_2yt_9amr_utils_10ProtoPrism_sweep, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("get_brick"), (PyCFunction)__pyx_pf_2yt_9amr_utils_10ProtoPrism_get_brick, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
+  {0, 0, 0, 0}
+};
+
+static struct PyGetSetDef __pyx_getsets_2yt_9amr_utils_ProtoPrism[] = {
+  {(char *)"LeftEdge", __pyx_getprop_2yt_9amr_utils_10ProtoPrism_LeftEdge, __pyx_setprop_2yt_9amr_utils_10ProtoPrism_LeftEdge, 0, 0},
+  {(char *)"RightEdge", __pyx_getprop_2yt_9amr_utils_10ProtoPrism_RightEdge, __pyx_setprop_2yt_9amr_utils_10ProtoPrism_RightEdge, 0, 0},
+  {(char *)"subgrid_faces", __pyx_getprop_2yt_9amr_utils_10ProtoPrism_subgrid_faces, __pyx_setprop_2yt_9amr_utils_10ProtoPrism_subgrid_faces, 0, 0},
+  {(char *)"parent_grid_id", __pyx_getprop_2yt_9amr_utils_10ProtoPrism_parent_grid_id, __pyx_setprop_2yt_9amr_utils_10ProtoPrism_parent_grid_id, 0, 0},
+  {0, 0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_ProtoPrism = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*nb_long*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_ProtoPrism = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_ProtoPrism = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_ProtoPrism = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+PyTypeObject __pyx_type_2yt_9amr_utils_ProtoPrism = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("yt.amr_utils.ProtoPrism"), /*tp_name*/
+  sizeof(struct __pyx_obj_2yt_9amr_utils_ProtoPrism), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_2yt_9amr_utils_ProtoPrism, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*tp_compare*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_ProtoPrism, /*tp_as_number*/
+  &__pyx_tp_as_sequence_ProtoPrism, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_ProtoPrism, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_ProtoPrism, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER|Py_TPFLAGS_HAVE_GC, /*tp_flags*/
+  0, /*tp_doc*/
+  __pyx_tp_traverse_2yt_9amr_utils_ProtoPrism, /*tp_traverse*/
+  __pyx_tp_clear_2yt_9amr_utils_ProtoPrism, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_9amr_utils_ProtoPrism, /*tp_methods*/
+  0, /*tp_members*/
+  __pyx_getsets_2yt_9amr_utils_ProtoPrism, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_9amr_utils_ProtoPrism, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*tp_version_tag*/
+  #endif
+};
+static struct __pyx_vtabstruct_2yt_9amr_utils_QuadTree __pyx_vtable_2yt_9amr_utils_QuadTree;
+
+static PyObject *__pyx_tp_new_2yt_9amr_utils_QuadTree(PyTypeObject *t, PyObject *a, PyObject *k) {
+  struct __pyx_obj_2yt_9amr_utils_QuadTree *p;
+  PyObject *o = (*t->tp_alloc)(t, 0);
+  if (!o) return 0;
+  p = ((struct __pyx_obj_2yt_9amr_utils_QuadTree *)o);
+  p->__pyx_vtab = __pyx_vtabptr_2yt_9amr_utils_QuadTree;
+  if (__pyx_pf_2yt_9amr_utils_8QuadTree___cinit__(o, a, k) < 0) {
+    Py_DECREF(o); o = 0;
+  }
+  return o;
+}
+
+static void __pyx_tp_dealloc_2yt_9amr_utils_QuadTree(PyObject *o) {
+  {
+    PyObject *etype, *eval, *etb;
+    PyErr_Fetch(&etype, &eval, &etb);
+    ++Py_REFCNT(o);
+    __pyx_pf_2yt_9amr_utils_8QuadTree___dealloc__(o);
+    if (PyErr_Occurred()) PyErr_WriteUnraisable(o);
+    --Py_REFCNT(o);
+    PyErr_Restore(etype, eval, etb);
+  }
+  (*Py_TYPE(o)->tp_free)(o);
+}
+
+static PyMethodDef __pyx_methods_2yt_9amr_utils_QuadTree[] = {
+  {__Pyx_NAMESTR("add_array_to_tree"), (PyCFunction)__pyx_pf_2yt_9amr_utils_8QuadTree_add_array_to_tree, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("add_grid_to_tree"), (PyCFunction)__pyx_pf_2yt_9amr_utils_8QuadTree_add_grid_to_tree, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
+  {__Pyx_NAMESTR("get_all_from_level"), (PyCFunction)__pyx_pf_2yt_9amr_utils_8QuadTree_get_all_from_level, METH_VARARGS|METH_KEYWORDS, __Pyx_DOCSTR(0)},
+  {0, 0, 0, 0}
+};
+
+static PyNumberMethods __pyx_tp_as_number_QuadTree = {
+  0, /*nb_add*/
+  0, /*nb_subtract*/
+  0, /*nb_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_divide*/
+  #endif
+  0, /*nb_remainder*/
+  0, /*nb_divmod*/
+  0, /*nb_power*/
+  0, /*nb_negative*/
+  0, /*nb_positive*/
+  0, /*nb_absolute*/
+  0, /*nb_nonzero*/
+  0, /*nb_invert*/
+  0, /*nb_lshift*/
+  0, /*nb_rshift*/
+  0, /*nb_and*/
+  0, /*nb_xor*/
+  0, /*nb_or*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_coerce*/
+  #endif
+  0, /*nb_int*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*nb_long*/
+  #endif
+  0, /*nb_float*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_oct*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_hex*/
+  #endif
+  0, /*nb_inplace_add*/
+  0, /*nb_inplace_subtract*/
+  0, /*nb_inplace_multiply*/
+  #if PY_MAJOR_VERSION < 3
+  0, /*nb_inplace_divide*/
+  #endif
+  0, /*nb_inplace_remainder*/
+  0, /*nb_inplace_power*/
+  0, /*nb_inplace_lshift*/
+  0, /*nb_inplace_rshift*/
+  0, /*nb_inplace_and*/
+  0, /*nb_inplace_xor*/
+  0, /*nb_inplace_or*/
+  0, /*nb_floor_divide*/
+  0, /*nb_true_divide*/
+  0, /*nb_inplace_floor_divide*/
+  0, /*nb_inplace_true_divide*/
+  #if (PY_MAJOR_VERSION >= 3) || (Py_TPFLAGS_DEFAULT & Py_TPFLAGS_HAVE_INDEX)
+  0, /*nb_index*/
+  #endif
+};
+
+static PySequenceMethods __pyx_tp_as_sequence_QuadTree = {
+  0, /*sq_length*/
+  0, /*sq_concat*/
+  0, /*sq_repeat*/
+  0, /*sq_item*/
+  0, /*sq_slice*/
+  0, /*sq_ass_item*/
+  0, /*sq_ass_slice*/
+  0, /*sq_contains*/
+  0, /*sq_inplace_concat*/
+  0, /*sq_inplace_repeat*/
+};
+
+static PyMappingMethods __pyx_tp_as_mapping_QuadTree = {
+  0, /*mp_length*/
+  0, /*mp_subscript*/
+  0, /*mp_ass_subscript*/
+};
+
+static PyBufferProcs __pyx_tp_as_buffer_QuadTree = {
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getreadbuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getwritebuffer*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getsegcount*/
+  #endif
+  #if PY_MAJOR_VERSION < 3
+  0, /*bf_getcharbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_getbuffer*/
+  #endif
+  #if PY_VERSION_HEX >= 0x02060000
+  0, /*bf_releasebuffer*/
+  #endif
+};
+
+PyTypeObject __pyx_type_2yt_9amr_utils_QuadTree = {
+  PyVarObject_HEAD_INIT(0, 0)
+  __Pyx_NAMESTR("yt.amr_utils.QuadTree"), /*tp_name*/
+  sizeof(struct __pyx_obj_2yt_9amr_utils_QuadTree), /*tp_basicsize*/
+  0, /*tp_itemsize*/
+  __pyx_tp_dealloc_2yt_9amr_utils_QuadTree, /*tp_dealloc*/
+  0, /*tp_print*/
+  0, /*tp_getattr*/
+  0, /*tp_setattr*/
+  #if PY_MAJOR_VERSION >= 3
+  0, /*reserved*/
+  #else
+  0, /*tp_compare*/
+  #endif
+  0, /*tp_repr*/
+  &__pyx_tp_as_number_QuadTree, /*tp_as_number*/
+  &__pyx_tp_as_sequence_QuadTree, /*tp_as_sequence*/
+  &__pyx_tp_as_mapping_QuadTree, /*tp_as_mapping*/
+  0, /*tp_hash*/
+  0, /*tp_call*/
+  0, /*tp_str*/
+  0, /*tp_getattro*/
+  0, /*tp_setattro*/
+  &__pyx_tp_as_buffer_QuadTree, /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT|Py_TPFLAGS_CHECKTYPES|Py_TPFLAGS_BASETYPE|Py_TPFLAGS_HAVE_NEWBUFFER, /*tp_flags*/
+  0, /*tp_doc*/
+  0, /*tp_traverse*/
+  0, /*tp_clear*/
+  0, /*tp_richcompare*/
+  0, /*tp_weaklistoffset*/
+  0, /*tp_iter*/
+  0, /*tp_iternext*/
+  __pyx_methods_2yt_9amr_utils_QuadTree, /*tp_methods*/
+  0, /*tp_members*/
+  0, /*tp_getset*/
+  0, /*tp_base*/
+  0, /*tp_dict*/
+  0, /*tp_descr_get*/
+  0, /*tp_descr_set*/
+  0, /*tp_dictoffset*/
+  0, /*tp_init*/
+  0, /*tp_alloc*/
+  __pyx_tp_new_2yt_9amr_utils_QuadTree, /*tp_new*/
+  0, /*tp_free*/
+  0, /*tp_is_gc*/
+  0, /*tp_bases*/
+  0, /*tp_mro*/
+  0, /*tp_cache*/
+  0, /*tp_subclasses*/
+  0, /*tp_weaklist*/
+  0, /*tp_del*/
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+  0, /*tp_version_tag*/
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+    NULL, /* m_reload */
+    NULL, /* m_traverse */
+    NULL, /* m_clear */
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+  {&__pyx_n_s__my_data, __pyx_k__my_data, sizeof(__pyx_k__my_data), 0, 0, 1, 1},
+  {&__pyx_n_s__my_field_tables, __pyx_k__my_field_tables, sizeof(__pyx_k__my_field_tables), 0, 0, 1, 1},
+  {&__pyx_n_s__n_field_tables, __pyx_k__n_field_tables, sizeof(__pyx_k__n_field_tables), 0, 0, 1, 1},
+  {&__pyx_n_s__n_fields, __pyx_k__n_fields, sizeof(__pyx_k__n_fields), 0, 0, 1, 1},
+  {&__pyx_n_s__names, __pyx_k__names, sizeof(__pyx_k__names), 0, 0, 1, 1},
+  {&__pyx_n_s__nbins, __pyx_k__nbins, sizeof(__pyx_k__nbins), 0, 0, 1, 1},
+  {&__pyx_n_s__ndim, __pyx_k__ndim, sizeof(__pyx_k__ndim), 0, 0, 1, 1},
+  {&__pyx_n_s__np, __pyx_k__np, sizeof(__pyx_k__np), 0, 0, 1, 1},
+  {&__pyx_n_s__npositions, __pyx_k__npositions, sizeof(__pyx_k__npositions), 0, 0, 1, 1},
+  {&__pyx_n_s__ns, __pyx_k__ns, sizeof(__pyx_k__ns), 0, 0, 1, 1},
+  {&__pyx_n_s__nshells, __pyx_k__nshells, sizeof(__pyx_k__nshells), 0, 0, 1, 1},
+  {&__pyx_n_s__numpy, __pyx_k__numpy, sizeof(__pyx_k__numpy), 0, 0, 1, 1},
+  {&__pyx_n_s__nv, __pyx_k__nv, sizeof(__pyx_k__nv), 0, 0, 1, 1},
+  {&__pyx_n_s__nvals, __pyx_k__nvals, sizeof(__pyx_k__nvals), 0, 0, 1, 1},
+  {&__pyx_n_s__o_s, __pyx_k__o_s, sizeof(__pyx_k__o_s), 0, 0, 1, 1},
+  {&__pyx_n_s__obj, __pyx_k__obj, sizeof(__pyx_k__obj), 0, 0, 1, 1},
+  {&__pyx_n_s__offset, __pyx_k__offset, sizeof(__pyx_k__offset), 0, 0, 1, 1},
+  {&__pyx_n_s__order, __pyx_k__order, sizeof(__pyx_k__order), 0, 0, 1, 1},
+  {&__pyx_n_s__output, __pyx_k__output, sizeof(__pyx_k__output), 0, 0, 1, 1},
+  {&__pyx_n_s__output_pos, __pyx_k__output_pos, sizeof(__pyx_k__output_pos), 0, 0, 1, 1},
+  {&__pyx_n_s__parent_grid_id, __pyx_k__parent_grid_id, sizeof(__pyx_k__parent_grid_id), 0, 0, 1, 1},
+  {&__pyx_n_s__pass_through, __pyx_k__pass_through, sizeof(__pyx_k__pass_through), 0, 0, 1, 1},
+  {&__pyx_n_s__pdx, __pyx_k__pdx, sizeof(__pyx_k__pdx), 0, 0, 1, 1},
+  {&__pyx_n_s__pdy, __pyx_k__pdy, sizeof(__pyx_k__pdy), 0, 0, 1, 1},
+  {&__pyx_n_s__pmask, __pyx_k__pmask, sizeof(__pyx_k__pmask), 0, 0, 1, 1},
+  {&__pyx_n_s__po2, __pyx_k__po2, sizeof(__pyx_k__po2), 0, 0, 1, 1},
+  {&__pyx_n_s__points, __pyx_k__points, sizeof(__pyx_k__points), 0, 0, 1, 1},
+  {&__pyx_n_s__pos, __pyx_k__pos, sizeof(__pyx_k__pos), 0, 0, 1, 1},
+  {&__pyx_n_s__posx, __pyx_k__posx, sizeof(__pyx_k__posx), 0, 0, 1, 1},
+  {&__pyx_n_s__posy, __pyx_k__posy, sizeof(__pyx_k__posy), 0, 0, 1, 1},
+  {&__pyx_n_s__posz, __pyx_k__posz, sizeof(__pyx_k__posz), 0, 0, 1, 1},
+  {&__pyx_n_s__proj_overlap, __pyx_k__proj_overlap, sizeof(__pyx_k__proj_overlap), 0, 0, 1, 1},
+  {&__pyx_n_s__pv, __pyx_k__pv, sizeof(__pyx_k__pv), 0, 0, 1, 1},
+  {&__pyx_n_s__pvals, __pyx_k__pvals, sizeof(__pyx_k__pvals), 0, 0, 1, 1},
+  {&__pyx_n_s__pweight_vals, __pyx_k__pweight_vals, sizeof(__pyx_k__pweight_vals), 0, 0, 1, 1},
+  {&__pyx_n_s__px, __pyx_k__px, sizeof(__pyx_k__px), 0, 0, 1, 1},
+  {&__pyx_n_s__pxs, __pyx_k__pxs, sizeof(__pyx_k__pxs), 0, 0, 1, 1},
+  {&__pyx_n_s__py, __pyx_k__py, sizeof(__pyx_k__py), 0, 0, 1, 1},
+  {&__pyx_n_s__pys, __pyx_k__pys, sizeof(__pyx_k__pys), 0, 0, 1, 1},
+  {&__pyx_n_s__range, __pyx_k__range, sizeof(__pyx_k__range), 0, 0, 1, 1},
+  {&__pyx_n_s__readonly, __pyx_k__readonly, sizeof(__pyx_k__readonly), 0, 0, 1, 1},
+  {&__pyx_n_s__red, __pyx_k__red, sizeof(__pyx_k__red), 0, 0, 1, 1},
+  {&__pyx_n_s__refined, __pyx_k__refined, sizeof(__pyx_k__refined), 0, 0, 1, 1},
+  {&__pyx_n_s__refined_pos, __pyx_k__refined_pos, sizeof(__pyx_k__refined_pos), 0, 0, 1, 1},
+  {&__pyx_n_s__right_edge, __pyx_k__right_edge, sizeof(__pyx_k__right_edge), 0, 0, 1, 1},
+  {&__pyx_n_s__root_nodes, __pyx_k__root_nodes, sizeof(__pyx_k__root_nodes), 0, 0, 1, 1},
+  {&__pyx_n_s__root_size, __pyx_k__root_size, sizeof(__pyx_k__root_size), 0, 0, 1, 1},
+  {&__pyx_n_s__rot_mat, __pyx_k__rot_mat, sizeof(__pyx_k__rot_mat), 0, 0, 1, 1},
+  {&__pyx_n_s__sample_values, __pyx_k__sample_values, sizeof(__pyx_k__sample_values), 0, 0, 1, 1},
+  {&__pyx_n_s__shape, __pyx_k__shape, sizeof(__pyx_k__shape), 0, 0, 1, 1},
+  {&__pyx_n_s__shells, __pyx_k__shells, sizeof(__pyx_k__shells), 0, 0, 1, 1},
+  {&__pyx_n_s__slab_size, __pyx_k__slab_size, sizeof(__pyx_k__slab_size), 0, 0, 1, 1},
+  {&__pyx_n_s__slab_start, __pyx_k__slab_start, sizeof(__pyx_k__slab_start), 0, 0, 1, 1},
+  {&__pyx_n_s__split, __pyx_k__split, sizeof(__pyx_k__split), 0, 0, 1, 1},
+  {&__pyx_n_s__stack, __pyx_k__stack, sizeof(__pyx_k__stack), 0, 0, 1, 1},
+  {&__pyx_n_s__start_index, __pyx_k__start_index, sizeof(__pyx_k__start_index), 0, 0, 1, 1},
+  {&__pyx_n_s__strides, __pyx_k__strides, sizeof(__pyx_k__strides), 0, 0, 1, 1},
+  {&__pyx_n_s__subgrid_faces, __pyx_k__subgrid_faces, sizeof(__pyx_k__subgrid_faces), 0, 0, 1, 1},
+  {&__pyx_n_s__suboffsets, __pyx_k__suboffsets, sizeof(__pyx_k__suboffsets), 0, 0, 1, 1},
+  {&__pyx_n_s__sweep, __pyx_k__sweep, sizeof(__pyx_k__sweep), 0, 0, 1, 1},
+  {&__pyx_n_s__table, __pyx_k__table, sizeof(__pyx_k__table), 0, 0, 1, 1},
+  {&__pyx_n_s__tables, __pyx_k__tables, sizeof(__pyx_k__tables), 0, 0, 1, 1},
+  {&__pyx_n_s__tf, __pyx_k__tf, sizeof(__pyx_k__tf), 0, 0, 1, 1},
+  {&__pyx_n_s__tf_obj, __pyx_k__tf_obj, sizeof(__pyx_k__tf_obj), 0, 0, 1, 1},
+  {&__pyx_n_s__top_grid_dims, __pyx_k__top_grid_dims, sizeof(__pyx_k__top_grid_dims), 0, 0, 1, 1},
+  {&__pyx_n_s__type_num, __pyx_k__type_num, sizeof(__pyx_k__type_num), 0, 0, 1, 1},
+  {&__pyx_n_s__u, __pyx_k__u, sizeof(__pyx_k__u), 0, 0, 1, 1},
+  {&__pyx_n_s__ug, __pyx_k__ug, sizeof(__pyx_k__ug), 0, 0, 1, 1},
+  {&__pyx_n_s__v, __pyx_k__v, sizeof(__pyx_k__v), 0, 0, 1, 1},
+  {&__pyx_n_s__val, __pyx_k__val, sizeof(__pyx_k__val), 0, 0, 1, 1},
+  {&__pyx_n_s__values, __pyx_k__values, sizeof(__pyx_k__values), 0, 0, 1, 1},
+  {&__pyx_n_s__vd_strides, __pyx_k__vd_strides, sizeof(__pyx_k__vd_strides), 0, 0, 1, 1},
+  {&__pyx_n_s__vp, __pyx_k__vp, sizeof(__pyx_k__vp), 0, 0, 1, 1},
+  {&__pyx_n_s__vp_dir, __pyx_k__vp_dir, sizeof(__pyx_k__vp_dir), 0, 0, 1, 1},
+  {&__pyx_n_s__vp_pos, __pyx_k__vp_pos, sizeof(__pyx_k__vp_pos), 0, 0, 1, 1},
+  {&__pyx_n_s__vp_strides, __pyx_k__vp_strides, sizeof(__pyx_k__vp_strides), 0, 0, 1, 1},
+  {&__pyx_n_s__weight_field_id, __pyx_k__weight_field_id, sizeof(__pyx_k__weight_field_id), 0, 0, 1, 1},
+  {&__pyx_n_s__weight_field_ids, __pyx_k__weight_field_ids, sizeof(__pyx_k__weight_field_ids), 0, 0, 1, 1},
+  {&__pyx_n_s__weight_table_id, __pyx_k__weight_table_id, sizeof(__pyx_k__weight_table_id), 0, 0, 1, 1},
+  {&__pyx_n_s__weight_table_ids, __pyx_k__weight_table_ids, sizeof(__pyx_k__weight_table_ids), 0, 0, 1, 1},
+  {&__pyx_n_s__weight_val, __pyx_k__weight_val, sizeof(__pyx_k__weight_val), 0, 0, 1, 1},
+  {&__pyx_n_s__wvals, __pyx_k__wvals, sizeof(__pyx_k__wvals), 0, 0, 1, 1},
+  {&__pyx_n_s__x, __pyx_k__x, sizeof(__pyx_k__x), 0, 0, 1, 1},
+  {&__pyx_n_s__x_bins, __pyx_k__x_bins, sizeof(__pyx_k__x_bins), 0, 0, 1, 1},
+  {&__pyx_n_s__x_bounds, __pyx_k__x_bounds, sizeof(__pyx_k__x_bounds), 0, 0, 1, 1},
+  {&__pyx_n_s__x_is, __pyx_k__x_is, sizeof(__pyx_k__x_is), 0, 0, 1, 1},
+  {&__pyx_n_s__x_vals, __pyx_k__x_vals, sizeof(__pyx_k__x_vals), 0, 0, 1, 1},
+  {&__pyx_n_s__x_vec, __pyx_k__x_vec, sizeof(__pyx_k__x_vec), 0, 0, 1, 1},
+  {&__pyx_n_s__xrange, __pyx_k__xrange, sizeof(__pyx_k__xrange), 0, 0, 1, 1},
+  {&__pyx_n_s__y, __pyx_k__y, sizeof(__pyx_k__y), 0, 0, 1, 1},
+  {&__pyx_n_s__y_bins, __pyx_k__y_bins, sizeof(__pyx_k__y_bins), 0, 0, 1, 1},
+  {&__pyx_n_s__y_is, __pyx_k__y_is, sizeof(__pyx_k__y_is), 0, 0, 1, 1},
+  {&__pyx_n_s__y_vals, __pyx_k__y_vals, sizeof(__pyx_k__y_vals), 0, 0, 1, 1},
+  {&__pyx_n_s__y_vec, __pyx_k__y_vec, sizeof(__pyx_k__y_vec), 0, 0, 1, 1},
+  {&__pyx_n_s__z, __pyx_k__z, sizeof(__pyx_k__z), 0, 0, 1, 1},
+  {&__pyx_n_s__z_bins, __pyx_k__z_bins, sizeof(__pyx_k__z_bins), 0, 0, 1, 1},
+  {&__pyx_n_s__z_is, __pyx_k__z_is, sizeof(__pyx_k__z_is), 0, 0, 1, 1},
+  {&__pyx_n_s__z_vals, __pyx_k__z_vals, sizeof(__pyx_k__z_vals), 0, 0, 1, 1},
+  {&__pyx_n_s__zeros, __pyx_k__zeros, sizeof(__pyx_k__zeros), 0, 0, 1, 1},
+  {0, 0, 0, 0, 0, 0, 0}
+};
+static int __Pyx_InitCachedBuiltins(void) {
+  __pyx_builtin_range = __Pyx_GetName(__pyx_b, __pyx_n_s__range); if (!__pyx_builtin_range) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 80; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  #if PY_MAJOR_VERSION >= 3
+  __pyx_builtin_xrange = __Pyx_GetName(__pyx_b, __pyx_n_s__range); if (!__pyx_builtin_xrange) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 51; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  #else
+  __pyx_builtin_xrange = __Pyx_GetName(__pyx_b, __pyx_n_s__xrange); if (!__pyx_builtin_xrange) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 51; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  #endif
+  __pyx_builtin_RuntimeError = __Pyx_GetName(__pyx_b, __pyx_n_s__RuntimeError); if (!__pyx_builtin_RuntimeError) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 614; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_builtin_ValueError = __Pyx_GetName(__pyx_b, __pyx_n_s__ValueError); if (!__pyx_builtin_ValueError) {__pyx_filename = __pyx_f[10]; __pyx_lineno = 206; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  return 0;
+  __pyx_L1_error:;
+  return -1;
+}
+
+static int __Pyx_InitGlobals(void) {
+  #if PY_VERSION_HEX < 0x02040000
+  if (unlikely(__Pyx_Py23SetsImport() < 0)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  #endif
+  if (__Pyx_InitStrings(__pyx_string_tab) < 0) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  __pyx_int_0 = PyInt_FromLong(0); if (unlikely(!__pyx_int_0)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  __pyx_int_1 = PyInt_FromLong(1); if (unlikely(!__pyx_int_1)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  __pyx_int_2 = PyInt_FromLong(2); if (unlikely(!__pyx_int_2)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  __pyx_int_3 = PyInt_FromLong(3); if (unlikely(!__pyx_int_3)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  __pyx_int_15 = PyInt_FromLong(15); if (unlikely(!__pyx_int_15)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  return 0;
+  __pyx_L1_error:;
+  return -1;
+}
+
+#if PY_MAJOR_VERSION < 3
+PyMODINIT_FUNC initamr_utils(void); /*proto*/
+PyMODINIT_FUNC initamr_utils(void)
+#else
+PyMODINIT_FUNC PyInit_amr_utils(void); /*proto*/
+PyMODINIT_FUNC PyInit_amr_utils(void)
+#endif
+{
+  PyObject *__pyx_t_1 = NULL;
+  PyObject *__pyx_t_2 = NULL;
+  PyObject *__pyx_t_3 = NULL;
+  #if CYTHON_REFNANNY
+  void* __pyx_refnanny = NULL;
+  __Pyx_RefNanny = __Pyx_RefNannyImportAPI("refnanny");
+  if (!__Pyx_RefNanny) {
+      PyErr_Clear();
+      __Pyx_RefNanny = __Pyx_RefNannyImportAPI("Cython.Runtime.refnanny");
+      if (!__Pyx_RefNanny)
+          Py_FatalError("failed to import 'refnanny' module");
+  }
+  __pyx_refnanny = __Pyx_RefNanny->SetupContext("PyMODINIT_FUNC PyInit_amr_utils(void)", __LINE__, __FILE__);
+  #endif
+  __pyx_empty_tuple = PyTuple_New(0); if (unlikely(!__pyx_empty_tuple)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_empty_bytes = PyBytes_FromStringAndSize("", 0); if (unlikely(!__pyx_empty_bytes)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  #ifdef __pyx_binding_PyCFunctionType_USED
+  if (__pyx_binding_PyCFunctionType_init() < 0) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  #endif
+  /*--- Library function declarations ---*/
+  /*--- Threads initialization code ---*/
+  #if defined(__PYX_FORCE_INIT_THREADS) && __PYX_FORCE_INIT_THREADS
+  #ifdef WITH_THREAD /* Python build with threading support? */
+  PyEval_InitThreads();
+  #endif
+  #endif
+  /*--- Module creation code ---*/
+  #if PY_MAJOR_VERSION < 3
+  __pyx_m = Py_InitModule4(__Pyx_NAMESTR("amr_utils"), __pyx_methods, __Pyx_DOCSTR(__pyx_k_13), 0, PYTHON_API_VERSION);
+  #else
+  __pyx_m = PyModule_Create(&__pyx_moduledef);
+  #endif
+  if (!__pyx_m) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  #if PY_MAJOR_VERSION < 3
+  Py_INCREF(__pyx_m);
+  #endif
+  __pyx_b = PyImport_AddModule(__Pyx_NAMESTR(__Pyx_BUILTIN_MODULE_NAME));
+  if (!__pyx_b) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  if (__Pyx_SetAttrString(__pyx_m, "__builtins__", __pyx_b) < 0) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  /*--- Initialize various global constants etc. ---*/
+  if (unlikely(__Pyx_InitGlobals() < 0)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__pyx_module_is_main_yt__amr_utils) {
+    if (__Pyx_SetAttrString(__pyx_m, "__name__", __pyx_n_s____main__) < 0) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;};
+  }
+  /*--- Builtin init code ---*/
+  if (unlikely(__Pyx_InitCachedBuiltins() < 0)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  /*--- Global init code ---*/
+  /*--- Function export code ---*/
+  /*--- Type init code ---*/
+  if (PyType_Ready(&__pyx_type_2yt_9amr_utils_position) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "position", (PyObject *)&__pyx_type_2yt_9amr_utils_position) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 30; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_9amr_utils_position = &__pyx_type_2yt_9amr_utils_position;
+  if (PyType_Ready(&__pyx_type_2yt_9amr_utils_OctreeGrid) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "OctreeGrid", (PyObject *)&__pyx_type_2yt_9amr_utils_OctreeGrid) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 36; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_9amr_utils_OctreeGrid = &__pyx_type_2yt_9amr_utils_OctreeGrid;
+  if (PyType_Ready(&__pyx_type_2yt_9amr_utils_OctreeGridList) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "OctreeGridList", (PyObject *)&__pyx_type_2yt_9amr_utils_OctreeGridList) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 53; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_9amr_utils_OctreeGridList = &__pyx_type_2yt_9amr_utils_OctreeGridList;
+  __pyx_vtabptr_2yt_9amr_utils_VectorPlane = &__pyx_vtable_2yt_9amr_utils_VectorPlane;
+  #if PY_MAJOR_VERSION >= 3
+  __pyx_vtable_2yt_9amr_utils_VectorPlane.get_start_stop = (void (*)(struct __pyx_obj_2yt_9amr_utils_VectorPlane *, __pyx_t_5numpy_float64_t *, int *))__pyx_f_2yt_9amr_utils_11VectorPlane_get_start_stop;
+  __pyx_vtable_2yt_9amr_utils_VectorPlane.copy_into = (void (*)(struct __pyx_obj_2yt_9amr_utils_VectorPlane *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, int, int, int, int *))__pyx_f_2yt_9amr_utils_11VectorPlane_copy_into;
+  __pyx_vtable_2yt_9amr_utils_VectorPlane.copy_back = (void (*)(struct __pyx_obj_2yt_9amr_utils_VectorPlane *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, int, int, int, int *))__pyx_f_2yt_9amr_utils_11VectorPlane_copy_back;
+  #else
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_VectorPlane.get_start_stop = (void(*)(void))__pyx_f_2yt_9amr_utils_11VectorPlane_get_start_stop;
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_VectorPlane.copy_into = (void(*)(void))__pyx_f_2yt_9amr_utils_11VectorPlane_copy_into;
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_VectorPlane.copy_back = (void(*)(void))__pyx_f_2yt_9amr_utils_11VectorPlane_copy_back;
+  #endif
+  if (PyType_Ready(&__pyx_type_2yt_9amr_utils_VectorPlane) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 222; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetVtable(__pyx_type_2yt_9amr_utils_VectorPlane.tp_dict, __pyx_vtabptr_2yt_9amr_utils_VectorPlane) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 222; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "VectorPlane", (PyObject *)&__pyx_type_2yt_9amr_utils_VectorPlane) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 222; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_9amr_utils_VectorPlane = &__pyx_type_2yt_9amr_utils_VectorPlane;
+  __pyx_vtabptr_2yt_9amr_utils_TransferFunctionProxy = &__pyx_vtable_2yt_9amr_utils_TransferFunctionProxy;
+  #if PY_MAJOR_VERSION >= 3
+  __pyx_vtable_2yt_9amr_utils_TransferFunctionProxy.eval_transfer = (void (*)(struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *))__pyx_f_2yt_9amr_utils_21TransferFunctionProxy_eval_transfer;
+  #else
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_TransferFunctionProxy.eval_transfer = (void(*)(void))__pyx_f_2yt_9amr_utils_21TransferFunctionProxy_eval_transfer;
+  #endif
+  if (PyType_Ready(&__pyx_type_2yt_9amr_utils_TransferFunctionProxy) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 118; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetVtable(__pyx_type_2yt_9amr_utils_TransferFunctionProxy.tp_dict, __pyx_vtabptr_2yt_9amr_utils_TransferFunctionProxy) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 118; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "TransferFunctionProxy", (PyObject *)&__pyx_type_2yt_9amr_utils_TransferFunctionProxy) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 118; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_9amr_utils_TransferFunctionProxy = &__pyx_type_2yt_9amr_utils_TransferFunctionProxy;
+  __pyx_vtabptr_2yt_9amr_utils_PartitionedGrid = &__pyx_vtable_2yt_9amr_utils_PartitionedGrid;
+  #if PY_MAJOR_VERSION >= 3
+  __pyx_vtable_2yt_9amr_utils_PartitionedGrid.calculate_extent = (void (*)(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *, struct __pyx_obj_2yt_9amr_utils_VectorPlane *, __pyx_t_5numpy_float64_t *))__pyx_f_2yt_9amr_utils_15PartitionedGrid_calculate_extent;
+  __pyx_vtable_2yt_9amr_utils_PartitionedGrid.integrate_ray = (int (*)(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *))__pyx_f_2yt_9amr_utils_15PartitionedGrid_integrate_ray;
+  __pyx_vtable_2yt_9amr_utils_PartitionedGrid.sample_values = (void (*)(struct __pyx_obj_2yt_9amr_utils_PartitionedGrid *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t, __pyx_t_5numpy_float64_t, int *, __pyx_t_5numpy_float64_t *, struct __pyx_obj_2yt_9amr_utils_TransferFunctionProxy *))__pyx_f_2yt_9amr_utils_15PartitionedGrid_sample_values;
+  #else
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_PartitionedGrid.calculate_extent = (void(*)(void))__pyx_f_2yt_9amr_utils_15PartitionedGrid_calculate_extent;
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_PartitionedGrid.integrate_ray = (void(*)(void))__pyx_f_2yt_9amr_utils_15PartitionedGrid_integrate_ray;
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_PartitionedGrid.sample_values = (void(*)(void))__pyx_f_2yt_9amr_utils_15PartitionedGrid_sample_values;
+  #endif
+  if (PyType_Ready(&__pyx_type_2yt_9amr_utils_PartitionedGrid) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 299; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetVtable(__pyx_type_2yt_9amr_utils_PartitionedGrid.tp_dict, __pyx_vtabptr_2yt_9amr_utils_PartitionedGrid) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 299; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "PartitionedGrid", (PyObject *)&__pyx_type_2yt_9amr_utils_PartitionedGrid) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 299; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_9amr_utils_PartitionedGrid = &__pyx_type_2yt_9amr_utils_PartitionedGrid;
+  __pyx_vtabptr_2yt_9amr_utils_GridFace = &__pyx_vtable_2yt_9amr_utils_GridFace;
+  #if PY_MAJOR_VERSION >= 3
+  __pyx_vtable_2yt_9amr_utils_GridFace.proj_overlap = (int (*)(struct __pyx_obj_2yt_9amr_utils_GridFace *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *))__pyx_f_2yt_9amr_utils_8GridFace_proj_overlap;
+  #else
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_GridFace.proj_overlap = (void(*)(void))__pyx_f_2yt_9amr_utils_8GridFace_proj_overlap;
+  #endif
+  if (PyType_Ready(&__pyx_type_2yt_9amr_utils_GridFace) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 543; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetVtable(__pyx_type_2yt_9amr_utils_GridFace.tp_dict, __pyx_vtabptr_2yt_9amr_utils_GridFace) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 543; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "GridFace", (PyObject *)&__pyx_type_2yt_9amr_utils_GridFace) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 543; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_9amr_utils_GridFace = &__pyx_type_2yt_9amr_utils_GridFace;
+  __pyx_vtabptr_2yt_9amr_utils_ProtoPrism = &__pyx_vtable_2yt_9amr_utils_ProtoPrism;
+  #if PY_MAJOR_VERSION >= 3
+  __pyx_vtable_2yt_9amr_utils_ProtoPrism.split = (PyObject *(*)(struct __pyx_obj_2yt_9amr_utils_ProtoPrism *, __pyx_t_5numpy_float64_t *, int))__pyx_f_2yt_9amr_utils_10ProtoPrism_split;
+  #else
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_ProtoPrism.split = (void(*)(void))__pyx_f_2yt_9amr_utils_10ProtoPrism_split;
+  #endif
+  if (PyType_Ready(&__pyx_type_2yt_9amr_utils_ProtoPrism) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 575; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetVtable(__pyx_type_2yt_9amr_utils_ProtoPrism.tp_dict, __pyx_vtabptr_2yt_9amr_utils_ProtoPrism) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 575; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "ProtoPrism", (PyObject *)&__pyx_type_2yt_9amr_utils_ProtoPrism) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 575; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_9amr_utils_ProtoPrism = &__pyx_type_2yt_9amr_utils_ProtoPrism;
+  __pyx_vtabptr_2yt_9amr_utils_QuadTree = &__pyx_vtable_2yt_9amr_utils_QuadTree;
+  #if PY_MAJOR_VERSION >= 3
+  __pyx_vtable_2yt_9amr_utils_QuadTree.add_to_position = (void (*)(struct __pyx_obj_2yt_9amr_utils_QuadTree *, int, __pyx_t_5numpy_int64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t))__pyx_f_2yt_9amr_utils_8QuadTree_add_to_position;
+  __pyx_vtable_2yt_9amr_utils_QuadTree.find_on_root_level = (struct __pyx_t_2yt_9amr_utils_QuadTreeNode *(*)(struct __pyx_obj_2yt_9amr_utils_QuadTree *, __pyx_t_5numpy_int64_t *, int))__pyx_f_2yt_9amr_utils_8QuadTree_find_on_root_level;
+  __pyx_vtable_2yt_9amr_utils_QuadTree.count_at_level = (int (*)(struct __pyx_obj_2yt_9amr_utils_QuadTree *, struct __pyx_t_2yt_9amr_utils_QuadTreeNode *, int))__pyx_f_2yt_9amr_utils_8QuadTree_count_at_level;
+  __pyx_vtable_2yt_9amr_utils_QuadTree.fill_from_level = (int (*)(struct __pyx_obj_2yt_9amr_utils_QuadTree *, struct __pyx_t_2yt_9amr_utils_QuadTreeNode *, int, __pyx_t_5numpy_int64_t, __pyx_t_5numpy_int64_t *, __pyx_t_5numpy_float64_t *, __pyx_t_5numpy_float64_t *))__pyx_f_2yt_9amr_utils_8QuadTree_fill_from_level;
+  #else
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_QuadTree.add_to_position = (void(*)(void))__pyx_f_2yt_9amr_utils_8QuadTree_add_to_position;
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_QuadTree.find_on_root_level = (void(*)(void))__pyx_f_2yt_9amr_utils_8QuadTree_find_on_root_level;
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_QuadTree.count_at_level = (void(*)(void))__pyx_f_2yt_9amr_utils_8QuadTree_count_at_level;
+  *(void(**)(void))&__pyx_vtable_2yt_9amr_utils_QuadTree.fill_from_level = (void(*)(void))__pyx_f_2yt_9amr_utils_8QuadTree_fill_from_level;
+  #endif
+  if (PyType_Ready(&__pyx_type_2yt_9amr_utils_QuadTree) < 0) {__pyx_filename = __pyx_f[9]; __pyx_lineno = 99; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetVtable(__pyx_type_2yt_9amr_utils_QuadTree.tp_dict, __pyx_vtabptr_2yt_9amr_utils_QuadTree) < 0) {__pyx_filename = __pyx_f[9]; __pyx_lineno = 99; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  if (__Pyx_SetAttrString(__pyx_m, "QuadTree", (PyObject *)&__pyx_type_2yt_9amr_utils_QuadTree) < 0) {__pyx_filename = __pyx_f[9]; __pyx_lineno = 99; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_2yt_9amr_utils_QuadTree = &__pyx_type_2yt_9amr_utils_QuadTree;
+  /*--- Type import code ---*/
+  __pyx_ptype_5numpy_dtype = __Pyx_ImportType("numpy", "dtype", sizeof(PyArray_Descr), 0); if (unlikely(!__pyx_ptype_5numpy_dtype)) {__pyx_filename = __pyx_f[10]; __pyx_lineno = 149; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5numpy_flatiter = __Pyx_ImportType("numpy", "flatiter", sizeof(PyArrayIterObject), 0); if (unlikely(!__pyx_ptype_5numpy_flatiter)) {__pyx_filename = __pyx_f[10]; __pyx_lineno = 159; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5numpy_broadcast = __Pyx_ImportType("numpy", "broadcast", sizeof(PyArrayMultiIterObject), 0); if (unlikely(!__pyx_ptype_5numpy_broadcast)) {__pyx_filename = __pyx_f[10]; __pyx_lineno = 163; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5numpy_ndarray = __Pyx_ImportType("numpy", "ndarray", sizeof(PyArrayObject), 0); if (unlikely(!__pyx_ptype_5numpy_ndarray)) {__pyx_filename = __pyx_f[10]; __pyx_lineno = 172; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __pyx_ptype_5numpy_ufunc = __Pyx_ImportType("numpy", "ufunc", sizeof(PyUFuncObject), 0); if (unlikely(!__pyx_ptype_5numpy_ufunc)) {__pyx_filename = __pyx_f[10]; __pyx_lineno = 849; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  /*--- Function import code ---*/
+  /*--- Execution code ---*/
+
+  /* "/Users/matthewturk/yt/yt/yt/amr_utils.pyx":32
+ * 
+ * # Set up some imports
+ * import numpy as np             # <<<<<<<<<<<<<<
+ * cimport numpy as np
+ * cimport cython
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 32; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/DepthFirstOctree.pyx":26
+ * """
+ * 
+ * import numpy as np             # <<<<<<<<<<<<<<
+ * cimport numpy as np
+ * cimport cython
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/Interpolators.pyx":1
+ * """             # <<<<<<<<<<<<<<
+ * Simple interpolators
+ * 
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[3]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/PointsInVolume.pyx":27
+ * 
+ * 
+ * import numpy as np             # <<<<<<<<<<<<<<
+ * cimport numpy as np
+ * cimport cython
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[1]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/RayIntegrators.pyx":26
+ * """
+ * 
+ * import numpy as np             # <<<<<<<<<<<<<<
+ * cimport numpy as np
+ * cimport cython
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[4]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/VolumeIntegrator.pyx":1
+ * """             # <<<<<<<<<<<<<<
+ * Simple integrators for the radiative transfer equation
+ * 
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[2]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/ContourFinding.pyx":26
+ * """
+ * 
+ * import numpy as np             # <<<<<<<<<<<<<<
+ * cimport numpy as np
+ * cimport cython
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[6]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/png_writer.pyx":1
+ * """             # <<<<<<<<<<<<<<
+ * A light interface to libpng
+ * 
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[7]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[7]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/fortran_reader.pyx":26
+ * """
+ * 
+ * import numpy as np             # <<<<<<<<<<<<<<
+ * cimport numpy as np
+ * cimport cython
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[8]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[8]; __pyx_lineno = 26; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
+
+  /* "/Users/matthewturk/yt/yt/yt/_amr_utils/QuadTree.pyx":27
+ * 
+ * 
+ * import numpy as np             # <<<<<<<<<<<<<<
+ * cimport numpy as np
+ * # Double up here for def'd functions
+ */
+  __pyx_t_1 = __Pyx_Import(((PyObject *)__pyx_n_s__numpy), 0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[9]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s__np, __pyx_t_1) < 0) {__pyx_filename = __pyx_f[9]; __pyx_lineno = 27; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
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+  /* "/Users/matthewturk/yt/yt/yt/amr_utils.pyx":1
+ * """             # <<<<<<<<<<<<<<
+ * Container file to hold all our Cython routines.  This is to avoid problems with
+ * static linking.
+ */
+  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(((PyObject *)__pyx_t_1));
+  __pyx_t_2 = PyObject_GetAttr(__pyx_m, __pyx_n_s__Transfer3D); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_2);
+  __pyx_t_3 = __Pyx_GetAttrString(__pyx_t_2, "__doc__"); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_3);
+  __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
+  if (PyDict_SetItem(__pyx_t_1, ((PyObject *)__pyx_kp_u_14), __pyx_t_3) < 0) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
+  __pyx_t_3 = PyObject_GetAttr(__pyx_m, __pyx_n_s__TransferShells); if (unlikely(!__pyx_t_3)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_3);
+  __pyx_t_2 = __Pyx_GetAttrString(__pyx_t_3, "__doc__"); if (unlikely(!__pyx_t_2)) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_2);
+  __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
+  if (PyDict_SetItem(__pyx_t_1, ((PyObject *)__pyx_kp_u_15), __pyx_t_2) < 0) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s____test__, ((PyObject *)__pyx_t_1)) < 0) {__pyx_filename = __pyx_f[11]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
+
+  /* "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/Cython/Includes/numpy.pxd":963
+ *      arr.base = baseptr
+ * 
+ * cdef inline object get_array_base(ndarray arr):             # <<<<<<<<<<<<<<
+ *     if arr.base is NULL:
+ *         return None
+ */
+  goto __pyx_L0;
+  __pyx_L1_error:;
+  __Pyx_XDECREF(__pyx_t_1);
+  __Pyx_XDECREF(__pyx_t_2);
+  __Pyx_XDECREF(__pyx_t_3);
+  if (__pyx_m) {
+    __Pyx_AddTraceback("init yt.amr_utils");
+    Py_DECREF(__pyx_m); __pyx_m = 0;
+  } else if (!PyErr_Occurred()) {
+    PyErr_SetString(PyExc_ImportError, "init yt.amr_utils");
+  }
+  __pyx_L0:;
+  __Pyx_RefNannyFinishContext();
+  #if PY_MAJOR_VERSION < 3
+  return;
+  #else
+  return __pyx_m;
+  #endif
+}
+
+/* Runtime support code */
+
+static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name) {
+    PyObject *result;
+    result = PyObject_GetAttr(dict, name);
+    if (!result)
+        PyErr_SetObject(PyExc_NameError, name);
+    return result;
+}
+
+static void __Pyx_RaiseArgtupleInvalid(
+    const char* func_name,
+    int exact,
+    Py_ssize_t num_min,
+    Py_ssize_t num_max,
+    Py_ssize_t num_found)
+{
+    Py_ssize_t num_expected;
+    const char *number, *more_or_less;
+
+    if (num_found < num_min) {
+        num_expected = num_min;
+        more_or_less = "at least";
+    } else {
+        num_expected = num_max;
+        more_or_less = "at most";
+    }
+    if (exact) {
+        more_or_less = "exactly";
+    }
+    number = (num_expected == 1) ? "" : "s";
+    PyErr_Format(PyExc_TypeError,
+        #if PY_VERSION_HEX < 0x02050000
+            "%s() takes %s %d positional argument%s (%d given)",
+        #else
+            "%s() takes %s %zd positional argument%s (%zd given)",
+        #endif
+        func_name, more_or_less, num_expected, number, num_found);
+}
+
+static CYTHON_INLINE int __Pyx_CheckKeywordStrings(
+    PyObject *kwdict,
+    const char* function_name,
+    int kw_allowed)
+{
+    PyObject* key = 0;
+    Py_ssize_t pos = 0;
+    while (PyDict_Next(kwdict, &pos, &key, 0)) {
+        #if PY_MAJOR_VERSION < 3
+        if (unlikely(!PyString_CheckExact(key)) && unlikely(!PyString_Check(key)))
+        #else
+        if (unlikely(!PyUnicode_CheckExact(key)) && unlikely(!PyUnicode_Check(key)))
+        #endif
+            goto invalid_keyword_type;
+    }
+    if ((!kw_allowed) && unlikely(key))
+        goto invalid_keyword;
+    return 1;
+invalid_keyword_type:
+    PyErr_Format(PyExc_TypeError,
+        "%s() keywords must be strings", function_name);
+    return 0;
+invalid_keyword:
+    PyErr_Format(PyExc_TypeError,
+    #if PY_MAJOR_VERSION < 3
+        "%s() got an unexpected keyword argument '%s'",
+        function_name, PyString_AsString(key));
+    #else
+        "%s() got an unexpected keyword argument '%U'",
+        function_name, key);
+    #endif
+    return 0;
+}
+
+static void __Pyx_RaiseDoubleKeywordsError(
+    const char* func_name,
+    PyObject* kw_name)
+{
+    PyErr_Format(PyExc_TypeError,
+        #if PY_MAJOR_VERSION >= 3
+        "%s() got multiple values for keyword argument '%U'", func_name, kw_name);
+        #else
+        "%s() got multiple values for keyword argument '%s'", func_name,
+        PyString_AS_STRING(kw_name));
+        #endif
+}
+
+static int __Pyx_ParseOptionalKeywords(
+    PyObject *kwds,
+    PyObject **argnames[],
+    PyObject *kwds2,
+    PyObject *values[],
+    Py_ssize_t num_pos_args,
+    const char* function_name)
+{
+    PyObject *key = 0, *value = 0;
+    Py_ssize_t pos = 0;
+    PyObject*** name;
+    PyObject*** first_kw_arg = argnames + num_pos_args;
+
+    while (PyDict_Next(kwds, &pos, &key, &value)) {
+        name = first_kw_arg;
+        while (*name && (**name != key)) name++;
+        if (*name) {
+            values[name-argnames] = value;
+        } else {
+            #if PY_MAJOR_VERSION < 3
+            if (unlikely(!PyString_CheckExact(key)) && unlikely(!PyString_Check(key))) {
+            #else
+            if (unlikely(!PyUnicode_CheckExact(key)) && unlikely(!PyUnicode_Check(key))) {
+            #endif
+                goto invalid_keyword_type;
+            } else {
+                for (name = first_kw_arg; *name; name++) {
+                    #if PY_MAJOR_VERSION >= 3
+                    if (PyUnicode_GET_SIZE(**name) == PyUnicode_GET_SIZE(key) &&
+                        PyUnicode_Compare(**name, key) == 0) break;
+                    #else
+                    if (PyString_GET_SIZE(**name) == PyString_GET_SIZE(key) &&
+                        _PyString_Eq(**name, key)) break;
+                    #endif
+                }
+                if (*name) {
+                    values[name-argnames] = value;
+                } else {
+                    /* unexpected keyword found */
+                    for (name=argnames; name != first_kw_arg; name++) {
+                        if (**name == key) goto arg_passed_twice;
+                        #if PY_MAJOR_VERSION >= 3
+                        if (PyUnicode_GET_SIZE(**name) == PyUnicode_GET_SIZE(key) &&
+                            PyUnicode_Compare(**name, key) == 0) goto arg_passed_twice;
+                        #else
+                        if (PyString_GET_SIZE(**name) == PyString_GET_SIZE(key) &&
+                            _PyString_Eq(**name, key)) goto arg_passed_twice;
+                        #endif
+                    }
+                    if (kwds2) {
+                        if (unlikely(PyDict_SetItem(kwds2, key, value))) goto bad;
+                    } else {
+                        goto invalid_keyword;
+                    }
+                }
+            }
+        }
+    }
+    return 0;
+arg_passed_twice:
+    __Pyx_RaiseDoubleKeywordsError(function_name, **name);
+    goto bad;
+invalid_keyword_type:
+    PyErr_Format(PyExc_TypeError,
+        "%s() keywords must be strings", function_name);
+    goto bad;
+invalid_keyword:
+    PyErr_Format(PyExc_TypeError,
+    #if PY_MAJOR_VERSION < 3
+        "%s() got an unexpected keyword argument '%s'",
+        function_name, PyString_AsString(key));
+    #else
+        "%s() got an unexpected keyword argument '%U'",
+        function_name, key);
+    #endif
+bad:
+    return -1;
+}
+
+static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
+    const char *name, int exact)
+{
+    if (!type) {
+        PyErr_Format(PyExc_SystemError, "Missing type object");
+        return 0;
+    }
+    if (none_allowed && obj == Py_None) return 1;
+    else if (exact) {
+        if (Py_TYPE(obj) == type) return 1;
+    }
+    else {
+        if (PyObject_TypeCheck(obj, type)) return 1;
+    }
+    PyErr_Format(PyExc_TypeError,
+        "Argument '%s' has incorrect type (expected %s, got %s)",
+        name, type->tp_name, Py_TYPE(obj)->tp_name);
+    return 0;
+}
+
+static CYTHON_INLINE int __Pyx_IsLittleEndian(void) {
+  unsigned int n = 1;
+  return *(unsigned char*)(&n) != 0;
+}
+
+typedef struct {
+  __Pyx_StructField root;
+  __Pyx_BufFmt_StackElem* head;
+  size_t fmt_offset;
+  int new_count, enc_count;
+  int is_complex;
+  char enc_type;
+  char packmode;
+} __Pyx_BufFmt_Context;
+
+static void __Pyx_BufFmt_Init(__Pyx_BufFmt_Context* ctx,
+                              __Pyx_BufFmt_StackElem* stack,
+                              __Pyx_TypeInfo* type) {
+  stack[0].field = &ctx->root;
+  stack[0].parent_offset = 0;
+  ctx->root.type = type;
+  ctx->root.name = "buffer dtype";
+  ctx->root.offset = 0;
+  ctx->head = stack;
+  ctx->head->field = &ctx->root;
+  ctx->fmt_offset = 0;
+  ctx->head->parent_offset = 0;
+  ctx->packmode = '@';
+  ctx->new_count = 1;
+  ctx->enc_count = 0;
+  ctx->enc_type = 0;
+  ctx->is_complex = 0;
+  while (type->typegroup == 'S') {
+    ++ctx->head;
+    ctx->head->field = type->fields;
+    ctx->head->parent_offset = 0;
+    type = type->fields->type;
+  }
+}
+
+static int __Pyx_BufFmt_ParseNumber(const char** ts) {
+    int count;
+    const char* t = *ts;
+    if (*t < '0' || *t > '9') {
+      return -1;
+    } else {
+        count = *t++ - '0';
+        while (*t >= '0' && *t < '9') {
+            count *= 10;
+            count += *t++ - '0';
+        }
+    }
+    *ts = t;
+    return count;
+}
+
+static void __Pyx_BufFmt_RaiseUnexpectedChar(char ch) {
+  char msg[] = {ch, 0};
+  PyErr_Format(PyExc_ValueError, "Unexpected format string character: '%s'", msg);
+}
+
+static const char* __Pyx_BufFmt_DescribeTypeChar(char ch, int is_complex) {
+  switch (ch) {
+    case 'b': return "'char'";
+    case 'B': return "'unsigned char'";
+    case 'h': return "'short'";
+    case 'H': return "'unsigned short'";
+    case 'i': return "'int'";
+    case 'I': return "'unsigned int'";
+    case 'l': return "'long'";
+    case 'L': return "'unsigned long'";
+    case 'q': return "'long long'";
+    case 'Q': return "'unsigned long long'";
+    case 'f': return (is_complex ? "'complex float'" : "'float'");
+    case 'd': return (is_complex ? "'complex double'" : "'double'");
+    case 'g': return (is_complex ? "'complex long double'" : "'long double'");
+    case 'T': return "a struct";
+    case 'O': return "Python object";
+    case 'P': return "a pointer";
+    case 0: return "end";
+    default: return "unparseable format string";
+  }
+}
+
+static size_t __Pyx_BufFmt_TypeCharToStandardSize(char ch, int is_complex) {
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': return 1;
+    case 'h': case 'H': return 2;
+    case 'i': case 'I': case 'l': case 'L': return 4;
+    case 'q': case 'Q': return 8;
+    case 'f': return (is_complex ? 8 : 4);
+    case 'd': return (is_complex ? 16 : 8);
+    case 'g': {
+      PyErr_SetString(PyExc_ValueError, "Python does not define a standard format string size for long double ('g')..");
+      return 0;
+    }
+    case 'O': case 'P': return sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+
+static size_t __Pyx_BufFmt_TypeCharToNativeSize(char ch, int is_complex) {
+  switch (ch) {
+    case 'c': case 'b': case 'B': return 1;
+    case 'h': case 'H': return sizeof(short);
+    case 'i': case 'I': return sizeof(int);
+    case 'l': case 'L': return sizeof(long);
+    #ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(PY_LONG_LONG);
+    #endif
+    case 'f': return sizeof(float) * (is_complex ? 2 : 1);
+    case 'd': return sizeof(double) * (is_complex ? 2 : 1);
+    case 'g': return sizeof(long double) * (is_complex ? 2 : 1);
+    case 'O': case 'P': return sizeof(void*);
+    default: {
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }    
+  }
+}
+
+typedef struct { char c; short x; } __Pyx_st_short;
+typedef struct { char c; int x; } __Pyx_st_int;
+typedef struct { char c; long x; } __Pyx_st_long;
+typedef struct { char c; float x; } __Pyx_st_float;
+typedef struct { char c; double x; } __Pyx_st_double;
+typedef struct { char c; long double x; } __Pyx_st_longdouble;
+typedef struct { char c; void *x; } __Pyx_st_void_p;
+#ifdef HAVE_LONG_LONG
+typedef struct { char c; PY_LONG_LONG x; } __Pyx_s_long_long;
+#endif
+
+static size_t __Pyx_BufFmt_TypeCharToAlignment(char ch, int is_complex) {
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': return 1;
+    case 'h': case 'H': return sizeof(__Pyx_st_short) - sizeof(short);
+    case 'i': case 'I': return sizeof(__Pyx_st_int) - sizeof(int);
+    case 'l': case 'L': return sizeof(__Pyx_st_long) - sizeof(long);
+#ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(__Pyx_s_long_long) - sizeof(PY_LONG_LONG);
+#endif
+    case 'f': return sizeof(__Pyx_st_float) - sizeof(float);
+    case 'd': return sizeof(__Pyx_st_double) - sizeof(double);
+    case 'g': return sizeof(__Pyx_st_longdouble) - sizeof(long double);
+    case 'P': case 'O': return sizeof(__Pyx_st_void_p) - sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+
+static size_t __Pyx_BufFmt_TypeCharToGroup(char ch, int is_complex) {
+  switch (ch) {
+    case 'c': case 'b': case 'h': case 'i': case 'l': case 'q': return 'I';
+    case 'B': case 'H': case 'I': case 'L': case 'Q': return 'U';
+    case 'f': case 'd': case 'g': return (is_complex ? 'C' : 'R');
+    case 'O': return 'O';
+    case 'P': return 'P';
+    default: {
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }    
+  }
+}
+
+static void __Pyx_BufFmt_RaiseExpected(__Pyx_BufFmt_Context* ctx) {
+  if (ctx->head == NULL || ctx->head->field == &ctx->root) {
+    const char* expected;
+    const char* quote;
+    if (ctx->head == NULL) {
+      expected = "end";
+      quote = "";
+    } else {
+      expected = ctx->head->field->type->name;
+      quote = "'";
+    }
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer dtype mismatch, expected %s%s%s but got %s",
+                 quote, expected, quote,
+                 __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex));
+  } else {
+    __Pyx_StructField* field = ctx->head->field;
+    __Pyx_StructField* parent = (ctx->head - 1)->field;
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer dtype mismatch, expected '%s' but got %s in '%s.%s'",
+                 field->type->name, __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex),
+                 parent->type->name, field->name);
+  }
+}
+
+static int __Pyx_BufFmt_ProcessTypeChunk(__Pyx_BufFmt_Context* ctx) {
+  char group;
+  size_t size, offset;
+  if (ctx->enc_type == 0) return 0;
+  group = __Pyx_BufFmt_TypeCharToGroup(ctx->enc_type, ctx->is_complex);
+  do {
+    __Pyx_StructField* field = ctx->head->field;
+    __Pyx_TypeInfo* type = field->type;
+  
+    if (ctx->packmode == '@' || ctx->packmode == '^') {
+      size = __Pyx_BufFmt_TypeCharToNativeSize(ctx->enc_type, ctx->is_complex);
+    } else {
+      size = __Pyx_BufFmt_TypeCharToStandardSize(ctx->enc_type, ctx->is_complex);
+    }
+    if (ctx->packmode == '@') {
+      int align_at = __Pyx_BufFmt_TypeCharToAlignment(ctx->enc_type, ctx->is_complex);
+      int align_mod_offset;
+      if (align_at == 0) return -1;
+      align_mod_offset = ctx->fmt_offset % align_at;
+      if (align_mod_offset > 0) ctx->fmt_offset += align_at - align_mod_offset;
+    }
+
+    if (type->size != size || type->typegroup != group) {
+      if (type->typegroup == 'C' && type->fields != NULL) {
+        /* special case -- treat as struct rather than complex number */
+        size_t parent_offset = ctx->head->parent_offset + field->offset;
+        ++ctx->head;
+        ctx->head->field = type->fields;
+        ctx->head->parent_offset = parent_offset;
+        continue;
+      }
+    
+      __Pyx_BufFmt_RaiseExpected(ctx);
+      return -1;
+    }
+
+    offset = ctx->head->parent_offset + field->offset;
+    if (ctx->fmt_offset != offset) {
+      PyErr_Format(PyExc_ValueError,
+                   "Buffer dtype mismatch; next field is at offset %"PY_FORMAT_SIZE_T"d "
+                   "but %"PY_FORMAT_SIZE_T"d expected", ctx->fmt_offset, offset);
+      return -1;
+    }
+
+    ctx->fmt_offset += size;
+  
+    --ctx->enc_count; /* Consume from buffer string */
+
+    /* Done checking, move to next field, pushing or popping struct stack if needed */
+    while (1) {
+      if (field == &ctx->root) {
+        ctx->head = NULL;
+        if (ctx->enc_count != 0) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return -1;
+        }
+        break; /* breaks both loops as ctx->enc_count == 0 */
+      }
+      ctx->head->field = ++field;
+      if (field->type == NULL) {
+        --ctx->head;
+        field = ctx->head->field;
+        continue;
+      } else if (field->type->typegroup == 'S') {
+        size_t parent_offset = ctx->head->parent_offset + field->offset;
+        if (field->type->fields->type == NULL) continue; /* empty struct */
+        field = field->type->fields;
+        ++ctx->head;
+        ctx->head->field = field;
+        ctx->head->parent_offset = parent_offset;
+        break;
+      } else {
+        break;
+      }
+    }
+  } while (ctx->enc_count);
+  ctx->enc_type = 0;
+  ctx->is_complex = 0;
+  return 0;    
+}
+
+static int __Pyx_BufFmt_FirstPack(__Pyx_BufFmt_Context* ctx) {
+  if (ctx->enc_type != 0 || ctx->packmode != '@') {
+    PyErr_SetString(PyExc_ValueError, "Buffer packing mode currently only allowed at beginning of format string (this is a defect)");
+    return -1;
+  }
+  return 0;
+}
+
+static const char* __Pyx_BufFmt_CheckString(__Pyx_BufFmt_Context* ctx, const char* ts) {
+  int got_Z = 0;
+  while (1) {
+    switch(*ts) {
+      case 0:
+        if (ctx->enc_type != 0 && ctx->head == NULL) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return NULL;
+        }
+        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+        if (ctx->head != NULL) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return NULL;
+        }
+        return ts;
+      case ' ':
+      case 10:
+      case 13:
+        ++ts;
+        break;
+      case '<':
+        if (!__Pyx_IsLittleEndian()) {
+          PyErr_SetString(PyExc_ValueError, "Little-endian buffer not supported on big-endian compiler");
+          return NULL;
+        }
+        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
+        ctx->packmode = '=';
+        ++ts;
+        break;
+      case '>':
+      case '!':
+        if (__Pyx_IsLittleEndian()) {
+          PyErr_SetString(PyExc_ValueError, "Big-endian buffer not supported on little-endian compiler");
+          return NULL;
+        }
+        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
+        ctx->packmode = '=';
+        ++ts;
+        break;
+      case '=':
+      case '@':
+      case '^':
+        if (__Pyx_BufFmt_FirstPack(ctx) == -1) return NULL;
+        ctx->packmode = *ts++;
+        break;
+      case 'T': /* substruct */
+        {
+          int i;
+          const char* ts_after_sub;
+          int struct_count = ctx->new_count;
+          ctx->new_count = 1;
+          ++ts;
+          if (*ts != '{') {
+            PyErr_SetString(PyExc_ValueError, "Buffer acquisition: Expected '{' after 'T'");
+            return NULL;
+          }
+          ++ts;
+          ts_after_sub = ts;
+          for (i = 0; i != struct_count; ++i) {
+            ts_after_sub = __Pyx_BufFmt_CheckString(ctx, ts);
+            if (!ts_after_sub) return NULL;
+          }
+          ts = ts_after_sub;
+        }
+        break;
+      case '}': /* end of substruct; either repeat or move on */
+        ++ts;
+        return ts;
+      case 'x':
+        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+        ctx->fmt_offset += ctx->new_count;
+        ctx->new_count = 1;
+        ctx->enc_count = 0;
+        ctx->enc_type = 0;
+        ++ts;
+        break;
+      case 'Z':
+        got_Z = 1;
+        ++ts;
+        if (*ts != 'f' && *ts != 'd' && *ts != 'g') {
+          __Pyx_BufFmt_RaiseUnexpectedChar('Z');
+          return NULL;
+        }        /* fall through */
+      case 'c': case 'b': case 'B': case 'h': case 'H': case 'i': case 'I':
+      case 'l': case 'L': case 'q': case 'Q':
+      case 'f': case 'd': case 'g':
+      case 'O':
+        if (ctx->enc_type == *ts && got_Z == ctx->is_complex) {
+          /* Continue pooling same type */
+          ctx->enc_count += ctx->new_count;
+        } else {
+          /* New type */
+          if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+          ctx->enc_count = ctx->new_count;
+          ctx->enc_type = *ts;
+          ctx->is_complex = got_Z;
+        }
+        ++ts;
+        ctx->new_count = 1;
+        got_Z = 0;
+        break;
+      default:
+        {
+          ctx->new_count = __Pyx_BufFmt_ParseNumber(&ts);
+          if (ctx->new_count == -1) { /* First char was not a digit */
+            char msg[2] = { *ts, 0 };
+            PyErr_Format(PyExc_ValueError,
+                         "Does not understand character buffer dtype format string ('%s')", msg);
+            return NULL;
+          }
+        }
+      
+    }
+  }
+}
+
+static CYTHON_INLINE void __Pyx_ZeroBuffer(Py_buffer* buf) {
+  buf->buf = NULL;
+  buf->obj = NULL;
+  buf->strides = __Pyx_zeros;
+  buf->shape = __Pyx_zeros;
+  buf->suboffsets = __Pyx_minusones;
+}
+
+static CYTHON_INLINE int __Pyx_GetBufferAndValidate(Py_buffer* buf, PyObject* obj, __Pyx_TypeInfo* dtype, int flags, int nd, int cast, __Pyx_BufFmt_StackElem* stack) {
+  if (obj == Py_None) {
+    __Pyx_ZeroBuffer(buf);
+    return 0;
+  }
+  buf->buf = NULL;
+  if (__Pyx_GetBuffer(obj, buf, flags) == -1) goto fail;
+  if (buf->ndim != nd) {
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer has wrong number of dimensions (expected %d, got %d)",
+                 nd, buf->ndim);
+    goto fail;
+  }
+  if (!cast) {
+    __Pyx_BufFmt_Context ctx;
+    __Pyx_BufFmt_Init(&ctx, stack, dtype);
+    if (!__Pyx_BufFmt_CheckString(&ctx, buf->format)) goto fail;
+  }
+  if ((unsigned)buf->itemsize != dtype->size) {
+    PyErr_Format(PyExc_ValueError,
+      "Item size of buffer (%"PY_FORMAT_SIZE_T"d byte%s) does not match size of '%s' (%"PY_FORMAT_SIZE_T"d byte%s)",
+      buf->itemsize, (buf->itemsize > 1) ? "s" : "",
+      dtype->name,
+      dtype->size, (dtype->size > 1) ? "s" : "");
+    goto fail;
+  }
+  if (buf->suboffsets == NULL) buf->suboffsets = __Pyx_minusones;
+  return 0;
+fail:;
+  __Pyx_ZeroBuffer(buf);
+  return -1;
+}
+
+static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info) {
+  if (info->buf == NULL) return;
+  if (info->suboffsets == __Pyx_minusones) info->suboffsets = NULL;
+  __Pyx_ReleaseBuffer(info);
+}
+
+static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb) {
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    PyThreadState *tstate = PyThreadState_GET();
+
+    tmp_type = tstate->curexc_type;
+    tmp_value = tstate->curexc_value;
+    tmp_tb = tstate->curexc_traceback;
+    tstate->curexc_type = type;
+    tstate->curexc_value = value;
+    tstate->curexc_traceback = tb;
+    Py_XDECREF(tmp_type);
+    Py_XDECREF(tmp_value);
+    Py_XDECREF(tmp_tb);
+}
+
+static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb) {
+    PyThreadState *tstate = PyThreadState_GET();
+    *type = tstate->curexc_type;
+    *value = tstate->curexc_value;
+    *tb = tstate->curexc_traceback;
+
+    tstate->curexc_type = 0;
+    tstate->curexc_value = 0;
+    tstate->curexc_traceback = 0;
+}
+
+
+
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
+    if (unlikely(!type)) {
+        PyErr_Format(PyExc_SystemError, "Missing type object");
+        return 0;
+    }
+    if (likely(PyObject_TypeCheck(obj, type)))
+        return 1;
+    PyErr_Format(PyExc_TypeError, "Cannot convert %.200s to %.200s",
+                 Py_TYPE(obj)->tp_name, type->tp_name);
+    return 0;
+}
+
+static void __Pyx_RaiseBufferFallbackError(void) {
+  PyErr_Format(PyExc_ValueError,
+     "Buffer acquisition failed on assignment; and then reacquiring the old buffer failed too!");
+}
+
+static void __Pyx_RaiseBufferIndexError(int axis) {
+  PyErr_Format(PyExc_IndexError,
+     "Out of bounds on buffer access (axis %d)", axis);
+}
+
+
+static CYTHON_INLINE long __Pyx_mod_long(long a, long b) {
+    long r = a % b;
+    r += ((r != 0) & ((r ^ b) < 0)) * b;
+    return r;
+}
+
+static CYTHON_INLINE long __Pyx_div_long(long a, long b) {
+    long q = a / b;
+    long r = a - q*b;
+    q -= ((r != 0) & ((r ^ b) < 0));
+    return q;
+}
+
+static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index) {
+    PyErr_Format(PyExc_ValueError,
+        #if PY_VERSION_HEX < 0x02050000
+                 "need more than %d value%s to unpack", (int)index,
+        #else
+                 "need more than %zd value%s to unpack", index,
+        #endif
+                 (index == 1) ? "" : "s");
+}
+
+static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected) {
+    PyErr_Format(PyExc_ValueError,
+        #if PY_VERSION_HEX < 0x02050000
+            "too many values to unpack (expected %d)", (int)expected);
+        #else
+            "too many values to unpack (expected %zd)", expected);
+        #endif
+}
+
+static PyObject *__Pyx_UnpackItem(PyObject *iter, Py_ssize_t index) {
+    PyObject *item;
+    if (!(item = PyIter_Next(iter))) {
+        if (!PyErr_Occurred()) {
+            __Pyx_RaiseNeedMoreValuesError(index);
+        }
+    }
+    return item;
+}
+
+static int __Pyx_EndUnpack(PyObject *iter, Py_ssize_t expected) {
+    PyObject *item;
+    if ((item = PyIter_Next(iter))) {
+        Py_DECREF(item);
+        __Pyx_RaiseTooManyValuesError(expected);
+        return -1;
+    }
+    else if (!PyErr_Occurred())
+        return 0;
+    else
+        return -1;
+}
+
+
+static CYTHON_INLINE __pyx_t_5numpy_int64_t __Pyx_div___pyx_t_5numpy_int64_t(__pyx_t_5numpy_int64_t a, __pyx_t_5numpy_int64_t b) {
+    __pyx_t_5numpy_int64_t q = a / b;
+    __pyx_t_5numpy_int64_t r = a - q*b;
+    q -= ((r != 0) & ((r ^ b) < 0));
+    return q;
+}
+
+static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void) {
+    PyErr_SetString(PyExc_TypeError, "'NoneType' object is not iterable");
+}
+
+static void __Pyx_UnpackTupleError(PyObject *t, Py_ssize_t index) {
+    if (t == Py_None) {
+      __Pyx_RaiseNoneNotIterableError();
+    } else if (PyTuple_GET_SIZE(t) < index) {
+      __Pyx_RaiseNeedMoreValuesError(PyTuple_GET_SIZE(t));
+    } else {
+      __Pyx_RaiseTooManyValuesError(index);
+    }
+}
+
+#if PY_MAJOR_VERSION < 3
+static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags) {
+  #if PY_VERSION_HEX >= 0x02060000
+  if (Py_TYPE(obj)->tp_flags & Py_TPFLAGS_HAVE_NEWBUFFER)
+      return PyObject_GetBuffer(obj, view, flags);
+  #endif
+  if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) return __pyx_pf_5numpy_7ndarray___getbuffer__(obj, view, flags);
+  else {
+  PyErr_Format(PyExc_TypeError, "'%100s' does not have the buffer interface", Py_TYPE(obj)->tp_name);
+  return -1;
+    }
+}
+
+static void __Pyx_ReleaseBuffer(Py_buffer *view) {
+  PyObject* obj = view->obj;
+  if (obj) {
+if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) __pyx_pf_5numpy_7ndarray___releasebuffer__(obj, view);
+    Py_DECREF(obj);
+    view->obj = NULL;
+  }
+}
+
+#endif
+
+static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list) {
+    PyObject *py_import = 0;
+    PyObject *empty_list = 0;
+    PyObject *module = 0;
+    PyObject *global_dict = 0;
+    PyObject *empty_dict = 0;
+    PyObject *list;
+    py_import = __Pyx_GetAttrString(__pyx_b, "__import__");
+    if (!py_import)
+        goto bad;
+    if (from_list)
+        list = from_list;
+    else {
+        empty_list = PyList_New(0);
+        if (!empty_list)
+            goto bad;
+        list = empty_list;
+    }
+    global_dict = PyModule_GetDict(__pyx_m);
+    if (!global_dict)
+        goto bad;
+    empty_dict = PyDict_New();
+    if (!empty_dict)
+        goto bad;
+    module = PyObject_CallFunctionObjArgs(py_import,
+        name, global_dict, empty_dict, list, NULL);
+bad:
+    Py_XDECREF(empty_list);
+    Py_XDECREF(py_import);
+    Py_XDECREF(empty_dict);
+    return module;
+}
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_intp(npy_intp val) {
+    const npy_intp neg_one = (npy_intp)-1, const_zero = (npy_intp)0;
+    const int is_unsigned = const_zero < neg_one;
+    if ((sizeof(npy_intp) == sizeof(char))  ||
+        (sizeof(npy_intp) == sizeof(short))) {
+        return PyInt_FromLong((long)val);
+    } else if ((sizeof(npy_intp) == sizeof(int)) ||
+               (sizeof(npy_intp) == sizeof(long))) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLong((unsigned long)val);
+        else
+            return PyInt_FromLong((long)val);
+    } else if (sizeof(npy_intp) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
+        else
+            return PyLong_FromLongLong((PY_LONG_LONG)val);
+    } else {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&val;
+        return _PyLong_FromByteArray(bytes, sizeof(npy_intp), 
+                                     little, !is_unsigned);
+    }
+}
+
+static CYTHON_INLINE npy_int32 __Pyx_PyInt_from_py_npy_int32(PyObject* x) {
+    const npy_int32 neg_one = (npy_int32)-1, const_zero = (npy_int32)0;
+    const int is_unsigned = const_zero < neg_one;
+    if (sizeof(npy_int32) == sizeof(char)) {
+        if (is_unsigned)
+            return (npy_int32)__Pyx_PyInt_AsUnsignedChar(x);
+        else
+            return (npy_int32)__Pyx_PyInt_AsSignedChar(x);
+    } else if (sizeof(npy_int32) == sizeof(short)) {
+        if (is_unsigned)
+            return (npy_int32)__Pyx_PyInt_AsUnsignedShort(x);
+        else
+            return (npy_int32)__Pyx_PyInt_AsSignedShort(x);
+    } else if (sizeof(npy_int32) == sizeof(int)) {
+        if (is_unsigned)
+            return (npy_int32)__Pyx_PyInt_AsUnsignedInt(x);
+        else
+            return (npy_int32)__Pyx_PyInt_AsSignedInt(x);
+    } else if (sizeof(npy_int32) == sizeof(long)) {
+        if (is_unsigned)
+            return (npy_int32)__Pyx_PyInt_AsUnsignedLong(x);
+        else
+            return (npy_int32)__Pyx_PyInt_AsSignedLong(x);
+    } else if (sizeof(npy_int32) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return (npy_int32)__Pyx_PyInt_AsUnsignedLongLong(x);
+        else
+            return (npy_int32)__Pyx_PyInt_AsSignedLongLong(x);
+    }  else {
+        npy_int32 val;
+        PyObject *v = __Pyx_PyNumber_Int(x);
+        #if PY_VERSION_HEX < 0x03000000
+        if (likely(v) && !PyLong_Check(v)) {
+            PyObject *tmp = v;
+            v = PyNumber_Long(tmp);
+            Py_DECREF(tmp);
+        }
+        #endif
+        if (likely(v)) {
+            int one = 1; int is_little = (int)*(unsigned char *)&one;
+            unsigned char *bytes = (unsigned char *)&val;
+            int ret = _PyLong_AsByteArray((PyLongObject *)v,
+                                          bytes, sizeof(val),
+                                          is_little, !is_unsigned);
+            Py_DECREF(v);
+            if (likely(!ret))
+                return val;
+        }
+        return (npy_int32)-1;
+    }
+}
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int32(npy_int32 val) {
+    const npy_int32 neg_one = (npy_int32)-1, const_zero = (npy_int32)0;
+    const int is_unsigned = const_zero < neg_one;
+    if ((sizeof(npy_int32) == sizeof(char))  ||
+        (sizeof(npy_int32) == sizeof(short))) {
+        return PyInt_FromLong((long)val);
+    } else if ((sizeof(npy_int32) == sizeof(int)) ||
+               (sizeof(npy_int32) == sizeof(long))) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLong((unsigned long)val);
+        else
+            return PyInt_FromLong((long)val);
+    } else if (sizeof(npy_int32) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
+        else
+            return PyLong_FromLongLong((PY_LONG_LONG)val);
+    } else {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&val;
+        return _PyLong_FromByteArray(bytes, sizeof(npy_int32), 
+                                     little, !is_unsigned);
+    }
+}
+
+#if PY_MAJOR_VERSION < 3
+static PyObject *__Pyx_GetStdout(void) {
+    PyObject *f = PySys_GetObject((char *)"stdout");
+    if (!f) {
+        PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");
+    }
+    return f;
+}
+
+static int __Pyx_Print(PyObject* f, PyObject *arg_tuple, int newline) {
+    PyObject* v;
+    int i;
+
+    if (!f) {
+        if (!(f = __Pyx_GetStdout()))
+            return -1;
+    }
+    for (i=0; i < PyTuple_GET_SIZE(arg_tuple); i++) {
+        if (PyFile_SoftSpace(f, 1)) {
+            if (PyFile_WriteString(" ", f) < 0)
+                return -1;
+        }
+        v = PyTuple_GET_ITEM(arg_tuple, i);
+        if (PyFile_WriteObject(v, f, Py_PRINT_RAW) < 0)
+            return -1;
+        if (PyString_Check(v)) {
+            char *s = PyString_AsString(v);
+            Py_ssize_t len = PyString_Size(v);
+            if (len > 0 &&
+                isspace(Py_CHARMASK(s[len-1])) &&
+                s[len-1] != ' ')
+                    PyFile_SoftSpace(f, 0);
+        }
+    }
+    if (newline) {
+        if (PyFile_WriteString("\n", f) < 0)
+            return -1;
+        PyFile_SoftSpace(f, 0);
+    }
+    return 0;
+}
+
+#else /* Python 3 has a print function */
+
+static int __Pyx_Print(PyObject* stream, PyObject *arg_tuple, int newline) {
+    PyObject* kwargs = 0;
+    PyObject* result = 0;
+    PyObject* end_string;
+    if (unlikely(!__pyx_print)) {
+        __pyx_print = __Pyx_GetAttrString(__pyx_b, "print");
+        if (!__pyx_print)
+            return -1;
+    }
+    if (stream) {
+        kwargs = PyDict_New();
+        if (unlikely(!kwargs))
+            return -1;
+        if (unlikely(PyDict_SetItemString(kwargs, "file", stream) < 0))
+            goto bad;
+        if (!newline) {
+            end_string = PyUnicode_FromStringAndSize(" ", 1);
+            if (unlikely(!end_string))
+                goto bad;
+            if (PyDict_SetItemString(kwargs, "end", end_string) < 0) {
+                Py_DECREF(end_string);
+                goto bad;
+            }
+            Py_DECREF(end_string);
+        }
+    } else if (!newline) {
+        if (unlikely(!__pyx_print_kwargs)) {
+            __pyx_print_kwargs = PyDict_New();
+            if (unlikely(!__pyx_print_kwargs))
+                return -1;
+            end_string = PyUnicode_FromStringAndSize(" ", 1);
+            if (unlikely(!end_string))
+                return -1;
+            if (PyDict_SetItemString(__pyx_print_kwargs, "end", end_string) < 0) {
+                Py_DECREF(end_string);
+                return -1;
+            }
+            Py_DECREF(end_string);
+        }
+        kwargs = __pyx_print_kwargs;
+    }
+    result = PyObject_Call(__pyx_print, arg_tuple, kwargs);
+    if (unlikely(kwargs) && (kwargs != __pyx_print_kwargs))
+        Py_DECREF(kwargs);
+    if (!result)
+        return -1;
+    Py_DECREF(result);
+    return 0;
+bad:
+    if (kwargs != __pyx_print_kwargs)
+        Py_XDECREF(kwargs);
+    return -1;
+}
+
+#endif
+
+static CYTHON_INLINE npy_int64 __Pyx_PyInt_from_py_npy_int64(PyObject* x) {
+    const npy_int64 neg_one = (npy_int64)-1, const_zero = (npy_int64)0;
+    const int is_unsigned = const_zero < neg_one;
+    if (sizeof(npy_int64) == sizeof(char)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedChar(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedChar(x);
+    } else if (sizeof(npy_int64) == sizeof(short)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedShort(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedShort(x);
+    } else if (sizeof(npy_int64) == sizeof(int)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedInt(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedInt(x);
+    } else if (sizeof(npy_int64) == sizeof(long)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedLong(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedLong(x);
+    } else if (sizeof(npy_int64) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return (npy_int64)__Pyx_PyInt_AsUnsignedLongLong(x);
+        else
+            return (npy_int64)__Pyx_PyInt_AsSignedLongLong(x);
+    }  else {
+        npy_int64 val;
+        PyObject *v = __Pyx_PyNumber_Int(x);
+        #if PY_VERSION_HEX < 0x03000000
+        if (likely(v) && !PyLong_Check(v)) {
+            PyObject *tmp = v;
+            v = PyNumber_Long(tmp);
+            Py_DECREF(tmp);
+        }
+        #endif
+        if (likely(v)) {
+            int one = 1; int is_little = (int)*(unsigned char *)&one;
+            unsigned char *bytes = (unsigned char *)&val;
+            int ret = _PyLong_AsByteArray((PyLongObject *)v,
+                                          bytes, sizeof(val),
+                                          is_little, !is_unsigned);
+            Py_DECREF(v);
+            if (likely(!ret))
+                return val;
+        }
+        return (npy_int64)-1;
+    }
+}
+
+#if PY_MAJOR_VERSION < 3
+
+static int __Pyx_PrintOne(PyObject* f, PyObject *o) {
+    if (!f) {
+        if (!(f = __Pyx_GetStdout()))
+            return -1;
+    }
+    if (PyFile_SoftSpace(f, 0)) {
+        if (PyFile_WriteString(" ", f) < 0)
+            return -1;
+    }
+    if (PyFile_WriteObject(o, f, Py_PRINT_RAW) < 0)
+        return -1;
+    if (PyFile_WriteString("\n", f) < 0)
+        return -1;
+    return 0;
+    /* the line below is just to avoid compiler
+     * compiler warnings about unused functions */
+    return __Pyx_Print(f, NULL, 0);
+}
+
+#else /* Python 3 has a print function */
+
+static int __Pyx_PrintOne(PyObject* stream, PyObject *o) {
+    int res;
+    PyObject* arg_tuple = PyTuple_New(1);
+    if (unlikely(!arg_tuple))
+        return -1;
+    Py_INCREF(o);
+    PyTuple_SET_ITEM(arg_tuple, 0, o);
+    res = __Pyx_Print(stream, arg_tuple, 1);
+    Py_DECREF(arg_tuple);
+    return res;
+}
+
+#endif
+
+#if PY_MAJOR_VERSION < 3
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb) {
+    Py_XINCREF(type);
+    Py_XINCREF(value);
+    Py_XINCREF(tb);
+    /* First, check the traceback argument, replacing None with NULL. */
+    if (tb == Py_None) {
+        Py_DECREF(tb);
+        tb = 0;
+    }
+    else if (tb != NULL && !PyTraceBack_Check(tb)) {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: arg 3 must be a traceback or None");
+        goto raise_error;
+    }
+    /* Next, replace a missing value with None */
+    if (value == NULL) {
+        value = Py_None;
+        Py_INCREF(value);
+    }
+    #if PY_VERSION_HEX < 0x02050000
+    if (!PyClass_Check(type))
+    #else
+    if (!PyType_Check(type))
+    #endif
+    {
+        /* Raising an instance.  The value should be a dummy. */
+        if (value != Py_None) {
+            PyErr_SetString(PyExc_TypeError,
+                "instance exception may not have a separate value");
+            goto raise_error;
+        }
+        /* Normalize to raise <class>, <instance> */
+        Py_DECREF(value);
+        value = type;
+        #if PY_VERSION_HEX < 0x02050000
+            if (PyInstance_Check(type)) {
+                type = (PyObject*) ((PyInstanceObject*)type)->in_class;
+                Py_INCREF(type);
+            }
+            else {
+                type = 0;
+                PyErr_SetString(PyExc_TypeError,
+                    "raise: exception must be an old-style class or instance");
+                goto raise_error;
+            }
+        #else
+            type = (PyObject*) Py_TYPE(type);
+            Py_INCREF(type);
+            if (!PyType_IsSubtype((PyTypeObject *)type, (PyTypeObject *)PyExc_BaseException)) {
+                PyErr_SetString(PyExc_TypeError,
+                    "raise: exception class must be a subclass of BaseException");
+                goto raise_error;
+            }
+        #endif
+    }
+
+    __Pyx_ErrRestore(type, value, tb);
+    return;
+raise_error:
+    Py_XDECREF(value);
+    Py_XDECREF(type);
+    Py_XDECREF(tb);
+    return;
+}
+
+#else /* Python 3+ */
+
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb) {
+    if (tb == Py_None) {
+        tb = 0;
+    } else if (tb && !PyTraceBack_Check(tb)) {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: arg 3 must be a traceback or None");
+        goto bad;
+    }
+    if (value == Py_None)
+        value = 0;
+
+    if (PyExceptionInstance_Check(type)) {
+        if (value) {
+            PyErr_SetString(PyExc_TypeError,
+                "instance exception may not have a separate value");
+            goto bad;
+        }
+        value = type;
+        type = (PyObject*) Py_TYPE(value);
+    } else if (!PyExceptionClass_Check(type)) {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: exception class must be a subclass of BaseException");
+        goto bad;
+    }
+
+    PyErr_SetObject(type, value);
+
+    if (tb) {
+        PyThreadState *tstate = PyThreadState_GET();
+        PyObject* tmp_tb = tstate->curexc_traceback;
+        if (tb != tmp_tb) {
+            Py_INCREF(tb);
+            tstate->curexc_traceback = tb;
+            Py_XDECREF(tmp_tb);
+        }
+    }
+
+bad:
+    return;
+}
+#endif
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_npy_int64(npy_int64 val) {
+    const npy_int64 neg_one = (npy_int64)-1, const_zero = (npy_int64)0;
+    const int is_unsigned = const_zero < neg_one;
+    if ((sizeof(npy_int64) == sizeof(char))  ||
+        (sizeof(npy_int64) == sizeof(short))) {
+        return PyInt_FromLong((long)val);
+    } else if ((sizeof(npy_int64) == sizeof(int)) ||
+               (sizeof(npy_int64) == sizeof(long))) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLong((unsigned long)val);
+        else
+            return PyInt_FromLong((long)val);
+    } else if (sizeof(npy_int64) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
+        else
+            return PyLong_FromLongLong((PY_LONG_LONG)val);
+    } else {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&val;
+        return _PyLong_FromByteArray(bytes, sizeof(npy_int64), 
+                                     little, !is_unsigned);
+    }
+}
+
+static CYTHON_INLINE png_uint_32 __Pyx_PyInt_from_py_png_uint_32(PyObject* x) {
+    const png_uint_32 neg_one = (png_uint_32)-1, const_zero = (png_uint_32)0;
+    const int is_unsigned = const_zero < neg_one;
+    if (sizeof(png_uint_32) == sizeof(char)) {
+        if (is_unsigned)
+            return (png_uint_32)__Pyx_PyInt_AsUnsignedChar(x);
+        else
+            return (png_uint_32)__Pyx_PyInt_AsSignedChar(x);
+    } else if (sizeof(png_uint_32) == sizeof(short)) {
+        if (is_unsigned)
+            return (png_uint_32)__Pyx_PyInt_AsUnsignedShort(x);
+        else
+            return (png_uint_32)__Pyx_PyInt_AsSignedShort(x);
+    } else if (sizeof(png_uint_32) == sizeof(int)) {
+        if (is_unsigned)
+            return (png_uint_32)__Pyx_PyInt_AsUnsignedInt(x);
+        else
+            return (png_uint_32)__Pyx_PyInt_AsSignedInt(x);
+    } else if (sizeof(png_uint_32) == sizeof(long)) {
+        if (is_unsigned)
+            return (png_uint_32)__Pyx_PyInt_AsUnsignedLong(x);
+        else
+            return (png_uint_32)__Pyx_PyInt_AsSignedLong(x);
+    } else if (sizeof(png_uint_32) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return (png_uint_32)__Pyx_PyInt_AsUnsignedLongLong(x);
+        else
+            return (png_uint_32)__Pyx_PyInt_AsSignedLongLong(x);
+    }  else {
+        png_uint_32 val;
+        PyObject *v = __Pyx_PyNumber_Int(x);
+        #if PY_VERSION_HEX < 0x03000000
+        if (likely(v) && !PyLong_Check(v)) {
+            PyObject *tmp = v;
+            v = PyNumber_Long(tmp);
+            Py_DECREF(tmp);
+        }
+        #endif
+        if (likely(v)) {
+            int one = 1; int is_little = (int)*(unsigned char *)&one;
+            unsigned char *bytes = (unsigned char *)&val;
+            int ret = _PyLong_AsByteArray((PyLongObject *)v,
+                                          bytes, sizeof(val),
+                                          is_little, !is_unsigned);
+            Py_DECREF(v);
+            if (likely(!ret))
+                return val;
+        }
+        return (png_uint_32)-1;
+    }
+}
+
+static CYTHON_INLINE long __Pyx_pow_long(long b, long e) {
+    long t = b;
+    switch (e) {
+        case 3:
+            t *= b;
+        case 2:
+            t *= b;
+        case 1:
+            return t;
+        case 0:
+            return 1;
+    }
+    if (unlikely(e<0)) return 0;
+    t = 1;
+    while (likely(e)) {
+        t *= (b * (e&1)) | ((~e)&1);    /* 1 or b */
+        b *= b;
+        e >>= 1;
+    }
+    return t;
+}
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
+      return ::std::complex< float >(x, y);
+    }
+  #else
+    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
+      return x + y*(__pyx_t_float_complex)_Complex_I;
+    }
+  #endif
+#else
+    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
+      __pyx_t_float_complex z;
+      z.real = x;
+      z.imag = y;
+      return z;
+    }
+#endif
+
+#if CYTHON_CCOMPLEX
+#else
+    static CYTHON_INLINE int __Pyx_c_eqf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+       return (a.real == b.real) && (a.imag == b.imag);
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_sumf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        z.real = a.real + b.real;
+        z.imag = a.imag + b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_difff(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        z.real = a.real - b.real;
+        z.imag = a.imag - b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_prodf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        z.real = a.real * b.real - a.imag * b.imag;
+        z.imag = a.real * b.imag + a.imag * b.real;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_quotf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        float denom = b.real * b.real + b.imag * b.imag;
+        z.real = (a.real * b.real + a.imag * b.imag) / denom;
+        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_negf(__pyx_t_float_complex a) {
+        __pyx_t_float_complex z;
+        z.real = -a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    static CYTHON_INLINE int __Pyx_c_is_zerof(__pyx_t_float_complex a) {
+       return (a.real == 0) && (a.imag == 0);
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_conjf(__pyx_t_float_complex a) {
+        __pyx_t_float_complex z;
+        z.real =  a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+/*
+    static CYTHON_INLINE float __Pyx_c_absf(__pyx_t_float_complex z) {
+#if HAVE_HYPOT
+        return hypotf(z.real, z.imag);
+#else
+        return sqrtf(z.real*z.real + z.imag*z.imag);
+#endif
+    }
+*/
+#endif
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
+      return ::std::complex< double >(x, y);
+    }
+  #else
+    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
+      return x + y*(__pyx_t_double_complex)_Complex_I;
+    }
+  #endif
+#else
+    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
+      __pyx_t_double_complex z;
+      z.real = x;
+      z.imag = y;
+      return z;
+    }
+#endif
+
+#if CYTHON_CCOMPLEX
+#else
+    static CYTHON_INLINE int __Pyx_c_eq(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+       return (a.real == b.real) && (a.imag == b.imag);
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_sum(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        z.real = a.real + b.real;
+        z.imag = a.imag + b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_diff(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        z.real = a.real - b.real;
+        z.imag = a.imag - b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_prod(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        z.real = a.real * b.real - a.imag * b.imag;
+        z.imag = a.real * b.imag + a.imag * b.real;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_quot(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        double denom = b.real * b.real + b.imag * b.imag;
+        z.real = (a.real * b.real + a.imag * b.imag) / denom;
+        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_neg(__pyx_t_double_complex a) {
+        __pyx_t_double_complex z;
+        z.real = -a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    static CYTHON_INLINE int __Pyx_c_is_zero(__pyx_t_double_complex a) {
+       return (a.real == 0) && (a.imag == 0);
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_conj(__pyx_t_double_complex a) {
+        __pyx_t_double_complex z;
+        z.real =  a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+/*
+    static CYTHON_INLINE double __Pyx_c_abs(__pyx_t_double_complex z) {
+#if HAVE_HYPOT
+        return hypot(z.real, z.imag);
+#else
+        return sqrt(z.real*z.real + z.imag*z.imag);
+#endif
+    }
+*/
+#endif
+
+static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject* x) {
+    const unsigned char neg_one = (unsigned char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned char" :
+                    "value too large to convert to unsigned char");
+            }
+            return (unsigned char)-1;
+        }
+        return (unsigned char)val;
+    }
+    return (unsigned char)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject* x) {
+    const unsigned short neg_one = (unsigned short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned short" :
+                    "value too large to convert to unsigned short");
+            }
+            return (unsigned short)-1;
+        }
+        return (unsigned short)val;
+    }
+    return (unsigned short)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject* x) {
+    const unsigned int neg_one = (unsigned int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned int" :
+                    "value too large to convert to unsigned int");
+            }
+            return (unsigned int)-1;
+        }
+        return (unsigned int)val;
+    }
+    return (unsigned int)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject* x) {
+    const char neg_one = (char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to char" :
+                    "value too large to convert to char");
+            }
+            return (char)-1;
+        }
+        return (char)val;
+    }
+    return (char)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject* x) {
+    const short neg_one = (short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to short" :
+                    "value too large to convert to short");
+            }
+            return (short)-1;
+        }
+        return (short)val;
+    }
+    return (short)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject* x) {
+    const int neg_one = (int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to int" :
+                    "value too large to convert to int");
+            }
+            return (int)-1;
+        }
+        return (int)val;
+    }
+    return (int)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject* x) {
+    const signed char neg_one = (signed char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed char" :
+                    "value too large to convert to signed char");
+            }
+            return (signed char)-1;
+        }
+        return (signed char)val;
+    }
+    return (signed char)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject* x) {
+    const signed short neg_one = (signed short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed short" :
+                    "value too large to convert to signed short");
+            }
+            return (signed short)-1;
+        }
+        return (signed short)val;
+    }
+    return (signed short)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject* x) {
+    const signed int neg_one = (signed int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed int" :
+                    "value too large to convert to signed int");
+            }
+            return (signed int)-1;
+        }
+        return (signed int)val;
+    }
+    return (signed int)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject* x) {
+    const int neg_one = (int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to int" :
+                    "value too large to convert to int");
+            }
+            return (int)-1;
+        }
+        return (int)val;
+    }
+    return (int)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject* x) {
+    const unsigned long neg_one = (unsigned long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to unsigned long");
+            return (unsigned long)-1;
+        }
+        return (unsigned long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to unsigned long");
+                return (unsigned long)-1;
+            }
+            return PyLong_AsUnsignedLong(x);
+        } else {
+            return PyLong_AsLong(x);
+        }
+    } else {
+        unsigned long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (unsigned long)-1;
+        val = __Pyx_PyInt_AsUnsignedLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject* x) {
+    const unsigned PY_LONG_LONG neg_one = (unsigned PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to unsigned PY_LONG_LONG");
+            return (unsigned PY_LONG_LONG)-1;
+        }
+        return (unsigned PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to unsigned PY_LONG_LONG");
+                return (unsigned PY_LONG_LONG)-1;
+            }
+            return PyLong_AsUnsignedLongLong(x);
+        } else {
+            return PyLong_AsLongLong(x);
+        }
+    } else {
+        unsigned PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (unsigned PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsUnsignedLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject* x) {
+    const long neg_one = (long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to long");
+            return (long)-1;
+        }
+        return (long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to long");
+                return (long)-1;
+            }
+            return PyLong_AsUnsignedLong(x);
+        } else {
+            return PyLong_AsLong(x);
+        }
+    } else {
+        long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (long)-1;
+        val = __Pyx_PyInt_AsLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject* x) {
+    const PY_LONG_LONG neg_one = (PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to PY_LONG_LONG");
+            return (PY_LONG_LONG)-1;
+        }
+        return (PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to PY_LONG_LONG");
+                return (PY_LONG_LONG)-1;
+            }
+            return PyLong_AsUnsignedLongLong(x);
+        } else {
+            return PyLong_AsLongLong(x);
+        }
+    } else {
+        PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject* x) {
+    const signed long neg_one = (signed long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to signed long");
+            return (signed long)-1;
+        }
+        return (signed long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to signed long");
+                return (signed long)-1;
+            }
+            return PyLong_AsUnsignedLong(x);
+        } else {
+            return PyLong_AsLong(x);
+        }
+    } else {
+        signed long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (signed long)-1;
+        val = __Pyx_PyInt_AsSignedLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject* x) {
+    const signed PY_LONG_LONG neg_one = (signed PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to signed PY_LONG_LONG");
+            return (signed PY_LONG_LONG)-1;
+        }
+        return (signed PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to signed PY_LONG_LONG");
+                return (signed PY_LONG_LONG)-1;
+            }
+            return PyLong_AsUnsignedLongLong(x);
+        } else {
+            return PyLong_AsLongLong(x);
+        }
+    } else {
+        signed PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (signed PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsSignedLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static void __Pyx_WriteUnraisable(const char *name) {
+    PyObject *old_exc, *old_val, *old_tb;
+    PyObject *ctx;
+    __Pyx_ErrFetch(&old_exc, &old_val, &old_tb);
+    #if PY_MAJOR_VERSION < 3
+    ctx = PyString_FromString(name);
+    #else
+    ctx = PyUnicode_FromString(name);
+    #endif
+    __Pyx_ErrRestore(old_exc, old_val, old_tb);
+    if (!ctx) {
+        PyErr_WriteUnraisable(Py_None);
+    } else {
+        PyErr_WriteUnraisable(ctx);
+        Py_DECREF(ctx);
+    }
+}
+
+static int __Pyx_SetVtable(PyObject *dict, void *vtable) {
+#if PY_VERSION_HEX >= 0x02070000 && !(PY_MAJOR_VERSION==3&&PY_MINOR_VERSION==0)
+    PyObject *ob = PyCapsule_New(vtable, 0, 0);
+#else
+    PyObject *ob = PyCObject_FromVoidPtr(vtable, 0);
+#endif
+    if (!ob)
+        goto bad;
+    if (PyDict_SetItemString(dict, "__pyx_vtable__", ob) < 0)
+        goto bad;
+    Py_DECREF(ob);
+    return 0;
+bad:
+    Py_XDECREF(ob);
+    return -1;
+}
+
+#ifndef __PYX_HAVE_RT_ImportType
+#define __PYX_HAVE_RT_ImportType
+static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name,
+    long size, int strict)
+{
+    PyObject *py_module = 0;
+    PyObject *result = 0;
+    PyObject *py_name = 0;
+    char warning[200];
+
+    py_module = __Pyx_ImportModule(module_name);
+    if (!py_module)
+        goto bad;
+    #if PY_MAJOR_VERSION < 3
+    py_name = PyString_FromString(class_name);
+    #else
+    py_name = PyUnicode_FromString(class_name);
+    #endif
+    if (!py_name)
+        goto bad;
+    result = PyObject_GetAttr(py_module, py_name);
+    Py_DECREF(py_name);
+    py_name = 0;
+    Py_DECREF(py_module);
+    py_module = 0;
+    if (!result)
+        goto bad;
+    if (!PyType_Check(result)) {
+        PyErr_Format(PyExc_TypeError, 
+            "%s.%s is not a type object",
+            module_name, class_name);
+        goto bad;
+    }
+    if (!strict && ((PyTypeObject *)result)->tp_basicsize > size) {
+        PyOS_snprintf(warning, sizeof(warning), 
+            "%s.%s size changed, may indicate binary incompatibility",
+            module_name, class_name);
+        #if PY_VERSION_HEX < 0x02050000
+        PyErr_Warn(NULL, warning);
+        #else
+        PyErr_WarnEx(NULL, warning, 0);
+        #endif
+    }
+    else if (((PyTypeObject *)result)->tp_basicsize != size) {
+        PyErr_Format(PyExc_ValueError, 
+            "%s.%s has the wrong size, try recompiling",
+            module_name, class_name);
+        goto bad;
+    }
+    return (PyTypeObject *)result;
+bad:
+    Py_XDECREF(py_module);
+    Py_XDECREF(result);
+    return 0;
+}
+#endif
+
+#ifndef __PYX_HAVE_RT_ImportModule
+#define __PYX_HAVE_RT_ImportModule
+static PyObject *__Pyx_ImportModule(const char *name) {
+    PyObject *py_name = 0;
+    PyObject *py_module = 0;
+
+    #if PY_MAJOR_VERSION < 3
+    py_name = PyString_FromString(name);
+    #else
+    py_name = PyUnicode_FromString(name);
+    #endif
+    if (!py_name)
+        goto bad;
+    py_module = PyImport_Import(py_name);
+    Py_DECREF(py_name);
+    return py_module;
+bad:
+    Py_XDECREF(py_name);
+    return 0;
+}
+#endif
+
+#include "compile.h"
+#include "frameobject.h"
+#include "traceback.h"
+
+static void __Pyx_AddTraceback(const char *funcname) {
+    PyObject *py_srcfile = 0;
+    PyObject *py_funcname = 0;
+    PyObject *py_globals = 0;
+    PyCodeObject *py_code = 0;
+    PyFrameObject *py_frame = 0;
+
+    #if PY_MAJOR_VERSION < 3
+    py_srcfile = PyString_FromString(__pyx_filename);
+    #else
+    py_srcfile = PyUnicode_FromString(__pyx_filename);
+    #endif
+    if (!py_srcfile) goto bad;
+    if (__pyx_clineno) {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, __pyx_clineno);
+        #else
+        py_funcname = PyUnicode_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, __pyx_clineno);
+        #endif
+    }
+    else {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromString(funcname);
+        #else
+        py_funcname = PyUnicode_FromString(funcname);
+        #endif
+    }
+    if (!py_funcname) goto bad;
+    py_globals = PyModule_GetDict(__pyx_m);
+    if (!py_globals) goto bad;
+    py_code = PyCode_New(
+        0,            /*int argcount,*/
+        #if PY_MAJOR_VERSION >= 3
+        0,            /*int kwonlyargcount,*/
+        #endif
+        0,            /*int nlocals,*/
+        0,            /*int stacksize,*/
+        0,            /*int flags,*/
+        __pyx_empty_bytes, /*PyObject *code,*/
+        __pyx_empty_tuple,  /*PyObject *consts,*/
+        __pyx_empty_tuple,  /*PyObject *names,*/
+        __pyx_empty_tuple,  /*PyObject *varnames,*/
+        __pyx_empty_tuple,  /*PyObject *freevars,*/
+        __pyx_empty_tuple,  /*PyObject *cellvars,*/
+        py_srcfile,   /*PyObject *filename,*/
+        py_funcname,  /*PyObject *name,*/
+        __pyx_lineno,   /*int firstlineno,*/
+        __pyx_empty_bytes  /*PyObject *lnotab*/
+    );
+    if (!py_code) goto bad;
+    py_frame = PyFrame_New(
+        PyThreadState_GET(), /*PyThreadState *tstate,*/
+        py_code,             /*PyCodeObject *code,*/
+        py_globals,          /*PyObject *globals,*/
+        0                    /*PyObject *locals*/
+    );
+    if (!py_frame) goto bad;
+    py_frame->f_lineno = __pyx_lineno;
+    PyTraceBack_Here(py_frame);
+bad:
+    Py_XDECREF(py_srcfile);
+    Py_XDECREF(py_funcname);
+    Py_XDECREF(py_code);
+    Py_XDECREF(py_frame);
+}
+
+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
+    while (t->p) {
+        #if PY_MAJOR_VERSION < 3
+        if (t->is_unicode) {
+            *t->p = PyUnicode_DecodeUTF8(t->s, t->n - 1, NULL);
+        } else if (t->intern) {
+            *t->p = PyString_InternFromString(t->s);
+        } else {
+            *t->p = PyString_FromStringAndSize(t->s, t->n - 1);
+        }
+        #else  /* Python 3+ has unicode identifiers */
+        if (t->is_unicode | t->is_str) {
+            if (t->intern) {
+                *t->p = PyUnicode_InternFromString(t->s);
+            } else if (t->encoding) {
+                *t->p = PyUnicode_Decode(t->s, t->n - 1, t->encoding, NULL);
+            } else {
+                *t->p = PyUnicode_FromStringAndSize(t->s, t->n - 1);
+            }
+        } else {
+            *t->p = PyBytes_FromStringAndSize(t->s, t->n - 1);
+        }
+        #endif
+        if (!*t->p)
+            return -1;
+        ++t;
+    }
+    return 0;
+}
+
+/* Type Conversion Functions */
+
+static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject* x) {
+   int is_true = x == Py_True;
+   if (is_true | (x == Py_False) | (x == Py_None)) return is_true;
+   else return PyObject_IsTrue(x);
+}
+
+static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x) {
+  PyNumberMethods *m;
+  const char *name = NULL;
+  PyObject *res = NULL;
+#if PY_VERSION_HEX < 0x03000000
+  if (PyInt_Check(x) || PyLong_Check(x))
+#else
+  if (PyLong_Check(x))
+#endif
+    return Py_INCREF(x), x;
+  m = Py_TYPE(x)->tp_as_number;
+#if PY_VERSION_HEX < 0x03000000
+  if (m && m->nb_int) {
+    name = "int";
+    res = PyNumber_Int(x);
+  }
+  else if (m && m->nb_long) {
+    name = "long";
+    res = PyNumber_Long(x);
+  }
+#else
+  if (m && m->nb_int) {
+    name = "int";
+    res = PyNumber_Long(x);
+  }
+#endif
+  if (res) {
+#if PY_VERSION_HEX < 0x03000000
+    if (!PyInt_Check(res) && !PyLong_Check(res)) {
+#else
+    if (!PyLong_Check(res)) {
+#endif
+      PyErr_Format(PyExc_TypeError,
+                   "__%s__ returned non-%s (type %.200s)",
+                   name, name, Py_TYPE(res)->tp_name);
+      Py_DECREF(res);
+      return NULL;
+    }
+  }
+  else if (!PyErr_Occurred()) {
+    PyErr_SetString(PyExc_TypeError,
+                    "an integer is required");
+  }
+  return res;
+}
+
+static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject* b) {
+  Py_ssize_t ival;
+  PyObject* x = PyNumber_Index(b);
+  if (!x) return -1;
+  ival = PyInt_AsSsize_t(x);
+  Py_DECREF(x);
+  return ival;
+}
+
+static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t ival) {
+#if PY_VERSION_HEX < 0x02050000
+   if (ival <= LONG_MAX)
+       return PyInt_FromLong((long)ival);
+   else {
+       unsigned char *bytes = (unsigned char *) &ival;
+       int one = 1; int little = (int)*(unsigned char*)&one;
+       return _PyLong_FromByteArray(bytes, sizeof(size_t), little, 0);
+   }
+#else
+   return PyInt_FromSize_t(ival);
+#endif
+}
+
+static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject* x) {
+   unsigned PY_LONG_LONG val = __Pyx_PyInt_AsUnsignedLongLong(x);
+   if (unlikely(val == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())) {
+       return (size_t)-1;
+   } else if (unlikely(val != (unsigned PY_LONG_LONG)(size_t)val)) {
+       PyErr_SetString(PyExc_OverflowError,
+                       "value too large to convert to size_t");
+       return (size_t)-1;
+   }
+   return (size_t)val;
+}
+
+
+#endif /* Py_PYTHON_H */
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/amr_utils.pyx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/amr_utils.pyx	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,47 @@
+"""
+Container file to hold all our Cython routines.  This is to avoid problems with
+static linking.
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2008 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+#cython embedsignature=True
+#cython cdivision=True
+#cython always_allow_keywords=True
+
+# Set up some imports
+import numpy as np
+cimport numpy as np
+cimport cython
+
+# We include all of our files
+
+include "_amr_utils/DepthFirstOctree.pyx"
+include "_amr_utils/Interpolators.pyx"
+include "_amr_utils/PointsInVolume.pyx"
+include "_amr_utils/RayIntegrators.pyx"
+include "_amr_utils/VolumeIntegrator.pyx"
+include "_amr_utils/CICDeposit.pyx"
+include "_amr_utils/ContourFinding.pyx"
+include "_amr_utils/png_writer.pyx"
+include "_amr_utils/fortran_reader.pyx"
+include "_amr_utils/QuadTree.pyx"
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/exceptions.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/exceptions.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,43 @@
+"""
+This is a library of yt-defined exceptions
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2009 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+# We don't need to import 'exceptions'
+#import exceptions
+
+class YTException(Exception):
+    def __init__(self, pf = None):
+        Exception.__init__(self)
+        self.pf = pf
+
+# Data access exceptions:
+
+class YTSphereTooSmall(YTException):
+    def __init__(self, pf, radius, smallest_cell):
+        YTException.__init__(self, pf)
+        self.radius = radius
+        self.smallest_cell = smallest_cell
+
+    def __str__(self):
+        return "%0.5e < %0.5e" % (self.radius, self.smallest_cell)
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/logger.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/logger.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,108 @@
+"""
+Logging facility for yt
+Will initialize everything, and associate one with each module
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2007-2009 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import logging, os
+import logging.handlers as handlers
+from yt.config import ytcfg
+
+# This next bit is grabbed from:
+# http://stackoverflow.com/questions/384076/how-can-i-make-the-python-logging-output-to-be-colored
+def add_coloring_to_emit_ansi(fn):
+    # add methods we need to the class
+    def new(*args):
+        levelno = args[1].levelno
+        if(levelno>=50):
+            color = '\x1b[31m' # red
+        elif(levelno>=40):
+            color = '\x1b[31m' # red
+        elif(levelno>=30):
+            color = '\x1b[33m' # yellow
+        elif(levelno>=20):
+            color = '\x1b[32m' # green 
+        elif(levelno>=10):
+            color = '\x1b[35m' # pink
+        else:
+            color = '\x1b[0m' # normal
+        args[1].msg = color + args[1].msg +  '\x1b[0m'  # normal
+        #print "after"
+        return fn(*args)
+    return new
+
+if ytcfg.getboolean("yt","coloredlogs"):
+    logging.StreamHandler.emit = add_coloring_to_emit_ansi(logging.StreamHandler.emit)
+
+level = min(max(ytcfg.getint("yt", "loglevel"), 0), 50)
+fstring = "%(name)-10s %(levelname)-10s %(asctime)s %(message)s"
+logging.basicConfig(
+    format=fstring,
+    level=level
+)
+
+f = logging.Formatter("%(levelname)-10s %(asctime)s %(message)s")
+
+rootLogger = logging.getLogger()
+
+ytLogger = logging.getLogger("yt")
+ytLogger.debug("Set log level to %s", level)
+
+fidoLogger = logging.getLogger("yt.fido")
+ravenLogger = logging.getLogger("yt.raven")
+lagosLogger = logging.getLogger("yt.lagos")
+enkiLogger = logging.getLogger("yt.enki")
+deliveratorLogger = logging.getLogger("yt.deliverator")
+reasonLogger = logging.getLogger("yt.reason")
+
+# Maybe some day we'll make this more configurable...  unfortunately, for now,
+# we preserve thread-safety by opening in the current directory.
+
+mb = 10*1024*1024
+bc = 10
+
+loggers = []
+file_handlers = []
+
+if ytcfg.getboolean("yt","logfile") and os.access(".", os.W_OK):
+    log_file_name = ytcfg.get("yt","LogFileName")
+    ytFileHandler = handlers.RotatingFileHandler(log_file_name,
+                                             maxBytes=mb, backupCount=bc)
+    k = logging.Formatter(fstring)
+    ytFileHandler.setFormatter(k)
+    ytLogger.addHandler(ytFileHandler)
+    loggers.append(ytLogger)
+    file_handlers.append(ytFileHandler)
+
+def disable_stream_logging():
+    # We just remove the root logger's handlers
+    for handler in rootLogger.handlers:
+        if isinstance(handler, logging.StreamHandler):
+            rootLogger.removeHandler(handler)
+
+def disable_file_logging():
+    for logger, handler in zip(loggers, file_handlers):
+        logger.removeHandler(handler)
+
+if ytcfg.getboolean("yt","suppressStreamLogging"):
+    disable_stream_logging()
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/parallel_tools/__init__.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/parallel_tools/__init__.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,27 @@
+"""
+Tools for parallelism.
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+from yt.lagos.ParallelTools import ParallelAnalysisInterface
+from distributed_object_collection import DistributedObjectCollection
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/parallel_tools/distributed_object_collection.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/parallel_tools/distributed_object_collection.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,135 @@
+"""
+A simple distributed object mechanism, for storing array-heavy objects.
+Meant to be subclassed.
+
+Author: Matthew Turk <matthewturk@gmail.com>
+Affiliation: KIPAC/SLAC/Stanford
+Homepage: http://yt.enzotools.org/
+License:
+  Copyright (C) 2010 Matthew Turk.  All Rights Reserved.
+
+  This file is part of yt.
+
+  yt is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import numpy as na
+from yt.funcs import *
+from yt.parallel_tools import ParallelAnalysisInterface
+from itertools import izip
+
+class DistributedObjectCollection(ParallelAnalysisInterface):
+    valid = True
+
+    def _get_object_info(self):
+        pass
+
+    def _set_object_info(self):
+        pass
+
+    def join_lists(self):
+        info_dict = self._get_object_info()
+        info_dict = self._mpi_catdict(info_dict)
+        self._set_object_info(info_dict)
+
+    def _collect_objects(self, desired_indices):
+        # We figure out which indices belong to which processor,
+        # then we pack them up, and we send a list to each processor.
+        request_count = []
+        owners = self._object_owners[desired_indices]
+        mylog.debug("Owner list: %s", na.unique1d(owners))
+        # Even if we have a million bricks, this should not take long.
+        s = self._mpi_get_size()
+        m = self._mpi_get_rank()
+        requests = dict( ( (i, []) for i in xrange(s) ) )
+        for i, p in izip(desired_indices, owners):
+            requests[p].append(i)
+        for p in sorted(requests):
+            requests[p] = na.array(requests[p], dtype='int64')
+            request_count.append(len(requests[p]))
+        size = len(request_count)
+        mylog.debug("Requesting: %s", request_count)
+        request_count = na.array(request_count, dtype='int64')
+        # Now we distribute our requests to all the processors.
+        # This is two-pass.  One to get the length of the arrays.  The second
+        # pass is to get the actual indices themselves.
+        request_count = self._mpi_joindict({m : request_count})
+        # Now we have our final array of requests, with arrangement
+        # (Nproc,Nproc).  First index corresponds to requesting proc, second to
+        # sending.  So [them,us] = 5 means we owe 5, whereas [us, them] means
+        # we are owed.
+        send_hooks = []
+        dsend_buffers, dsend_hooks = [], []
+        recv_hooks, recv_buffers = [], []
+        drecv_buffers, drecv_hooks = [], []
+        # We post our index-list and data receives from each processor.
+        mylog.debug("Posting data buffer receives")
+        proc_hooks = {}
+        for p, request_from in request_count.items():
+            if p == m: continue
+            size = request_from[m]
+            #if size == 0: continue
+            # We post receives of the grids we *asked* for.
+            # Note that indices into this are not necessarily processor ids.
+            # So we store.  This has to go before the appends or it's an
+            # off-by-one.
+            mylog.debug("Setting up index buffer of size %s for receive from %s",
+                        size, p)
+            proc_hooks[len(drecv_buffers)] = p
+            drecv_buffers.append(self._create_buffer(requests[p]))
+            drecv_hooks.append(self._mpi_Irecv_double(drecv_buffers[-1], p, 1))
+            recv_buffers.append(na.zeros(size, dtype='int64'))
+            # Our index list goes on 0, our buffer goes on 1.  We know how big
+            # the index list will be, now.
+            recv_hooks.append(self._mpi_Irecv_long(recv_buffers[-1], p, 0))
+        # Send our index lists into hte waiting buffers
+        mylog.debug("Sending index lists")
+        for p, ind_list in requests.items():
+            if p == m: continue
+            if len(ind_list) == 0: continue
+            # Now, we actually send our index lists.
+            send_hooks.append(self._mpi_Isend_long(ind_list, p, 0))
+        # Now we post receives for all of the data buffers.
+        mylog.debug("Sending data")
+        for i in self._mpi_Request_Waititer(recv_hooks):
+            # We get back the index, which here is identical to the processor
+            # number doing the send.  At this point, we can post our receives.
+            p = proc_hooks[i]
+            mylog.debug("Processing from %s", p)
+            ind_list = recv_buffers[i]
+            dsend_buffers.append(self._create_buffer(ind_list))
+            self._pack_buffer(ind_list, dsend_buffers[-1])
+            dsend_hooks.append(self._mpi_Isend_double(
+                dsend_buffers[-1], p, 1))
+        mylog.debug("Waiting on data receives: %s", len(drecv_hooks))
+        for i in self._mpi_Request_Waititer(drecv_hooks):
+            mylog.debug("Unpacking from %s", proc_hooks[i])
+            # Now we have to unpack our buffers
+            # Our key into this is actually the request for the processor
+            # number.
+            p = proc_hooks[i]
+            self._unpack_buffer(requests[p], drecv_buffers[i])
+        mylog.debug("Finalizing sends: %s", len(dsend_hooks))
+        for i in self._mpi_Request_Waititer(dsend_hooks):
+            continue
+
+    def _create_buffer(self, ind_list):
+        pass
+
+    def _pack_buffer(self, ind_list):
+        pass
+
+    def _unpack_buffer(self, ind_list, my_buffer):
+        pass
+
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/physical_constants.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/physical_constants.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,53 @@
+#
+# Physical Constants and Units Conversion Factors
+#
+
+# Masses
+mass_hydrogen_cgs = 1.67e-24 # g
+mass_electron_cgs = 9.11e-28 # g
+# Velocities
+speed_of_light_cgs = 2.99792458e10 # cm/s, exact
+
+# Cross Sections
+cross_section_thompson_cgs = 6.65e-25 # cm^2
+
+# Physical Constants
+boltzmann_constant_cgs = 1.3806504e-16 # erg K^-1
+gravitational_constant_cgs  = 6.67428e-8 # cm^3 g^-1 s^-2
+planck_constant_cgs   = 6.62606896e-27 # erg s
+rho_crit_now = 1.8788e-29 # g times h^2 (critical mass for closure, Cosmology)
+
+# Misc. Approximations
+mass_mean_atomic_cosmology = 1.22
+mass_mean_atomic_galactic = 2.3
+
+# Conversion Factors:  X au * mpc_per_au = Y au
+# length
+mpc_per_mpc   = 1
+mpc_per_kpc   = 1e-3
+mpc_per_pc    = 1e-6
+mpc_per_au    = 4.847e-12
+mpc_per_rsun  = 2.253e-14
+mpc_per_miles = 5.216e-20
+mpc_per_cm    = 3.24e-25
+km_per_pc     = 1.3806504e13 
+km_per_m      = 1e-3
+km_per_cm     = 1e-5
+
+m_per_fpc     = 0.0324077649
+
+au_per_mpc    = 2.063e11
+rsun_per_mpc  = 4.43664e13
+miles_per_mpc = 1.917e19
+cm_per_mpc    = 3.0857e24
+cm_per_km     = 1e5
+pc_per_km     = 3.24e-14
+pc_per_cm     = 3.24e-19
+#Short cuts
+G = gravitational_constant_cgs
+me = mass_electron_cgs
+mp = mass_hydrogen_cgs
+clight = speed_of_light_cgs
+kboltz = boltzmann_constant_cgs
+hcgs = planck_constant_cgs
+sigma_thompson = cross_section_thompson_cgs
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/utilities/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/utilities/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('utilities',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/visualization/image_panner/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/visualization/image_panner/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('image_panner',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config
diff -r 87b5d03be7855cb99e3919d1de934110b0e49fc9 -r c6b41bae4551bcbca86efa061d317ca63baea751 yt/visualization/opengl_widgets/setup.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/yt/visualization/opengl_widgets/setup.py	Thu Aug 26 10:24:41 2010 -0600
@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import setuptools
+import os, sys, os.path
+
+import os.path
+
+def configuration(parent_package='',top_path=None):
+    from numpy.distutils.misc_util import Configuration
+    config = Configuration('opengl_widgets',parent_package,top_path)
+    config.make_config_py() # installs __config__.py
+    config.make_svn_version_py()
+    return config