[vtkusers] how to make the clipped part of the cow invisible

[zhixiu li]

Dear ALL,
I have tried the example of ClipCow.
http://vtk.org/gitweb?p=VTK.git;a=blob;f=Examples/VisualizationAlgorithms/Python/ClipCow.py

But I want to make the clipped part of the cow invisible instead of
rendered airframe. Any idea? Thank you!
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