New issue 1189: error in volume rendering if north_vector is aligned with normal_vector https://bitbucket.org/yt_analysis/yt/issues/1189/error-in-volume-rendering-i... Michael Zingale: If the normal_vector is aligned with the north_vector, the volume rendering fails: ``` File "/home/zingale/development/yt-mz/yt/visualization/volume_rendering/camera.py", line 320, in switch_orientation self._setup_normalized_vectors(normal_vector, north_vector) File "/home/zingale/development/yt-mz/yt/utilities/orientation.py", line 92, in _setup_normalized_vectors self.inv_mat = np.linalg.pinv(self.unit_vectors) File "/usr/lib64/python2.7/site-packages/numpy/linalg/linalg.py", line 1585, in pinv u, s, vt = svd(a, 0) File "/usr/lib64/python2.7/site-packages/numpy/linalg/linalg.py", line 1327, in svd u, s, vt = gufunc(a, signature=signature, extobj=extobj) File "/usr/lib64/python2.7/site-packages/numpy/linalg/linalg.py", line 99, in _raise_linalgerror_svd_nonconvergence raise LinAlgError("SVD did not converge") numpy.linalg.linalg.LinAlgError: SVD did not converge ``` If I offset it even just a little bit, then it works. But if I want to do a rendering looking down at "north", we get this message. If this is a limitation of the VR, we should do a check and issue a warning.