[vtkusers] PolyDataToImageData only produces a black image

[Siming Bayer]

Dear all,

I just rewritten the c++ PolyDataToImageData
example(http://www.vtk.org/Wiki/VTK/Examples/Cxx/
PolyData/PolyDataToImageData)
to python. And I have changed nothing, just simply rewrite the c++ code to
python code. However, the python file only produce a black image
(256x257x256, 8bit). I used imageJ to open the produce the .mhd file. The
VTK version on my machine is 7.1. Does anybody know the reason for it? How
can I solve it?

best,
Siming
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