[vtkusers] how to show the cutting plane in the vtk

[zhixiu li]

Hi,
I run the Examples/VisualizationAlgorithms/Python/ClipCow.py<http://vtk.org/gitweb?p=VTK.git;a=blob;f=Examples/VisualizationAlgorithms/Python/ClipCow.py>and
want the show both the cliped_cow and the cutting plane (a 2D plane)
in
one VTK window. But I don't know how to show the cutting plane. Any ideas?
Thank you!
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