>>> cam = pf.h.camera(c, L, W, (Nvec,Nvec), tf, north_vector=north_vector)
yt : [INFO     ] 2013-10-22 10:44:17,235 Warning: no_ghost is currently True (default). This may lead to artifacts at grid boundaries.
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/yt-conda/src/yt-hg/yt/visualization/volume_rendering/camera.py", line 202, in __init__
    max_level=max_level, data_source=self.data_source)
  File "/usr/local/yt-conda/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.py", line 161, in __init__
    data_source=data_source)
  File "/usr/local/yt-conda/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.py", line 69, in __init__
    self.build()
  File "/usr/local/yt-conda/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.py", line 86, in build
    self.add_grids(grids)
  File "/usr/local/yt-conda/src/yt-hg/yt/utilities/amr_kdtree/amr_kdtree.py", line 76, in add_grids
    self.comm_rank, self.comm_size)
  File "amr_kdtools.pyx", line 250, in yt.utilities.lib.amr_kdtools.add_pygrids (yt/utilities/lib/amr_kdtools.c:4968)
ValueError: Buffer has wrong number of dimensions (expected 2, got 1)