VTK / Python/ Anaconda -- wiki example shows bug in volume render?
When trying the example http://www.vtk.org/Wiki/VTK/Examples/Python/vtkWithNumpy The following installation on Windows
conda: 4.3.17-py27_0 conda-env: 2.6.0-0 vtk: 6.3.0-py27_1
The red cube appears black , and appears to render in front of the green cube when it shoudl be behind.
I think it is due to the behavior of the colour and alpha table when the value is exactly on the table point.
If I change the colour and alpha tables to have values at 49 and 51 instead of a transition at exactly 50, then the example works as expected.
It seems to me like a specific choice in the example exposes a bug ie. unexpected behaviour in the colour/alpha table or the alpha rendering ?