[vtkusers] How to outline the "contour" ??

[Yi-Yu Chou]

Dear vtk users,

I would like to cut a sphere actor and project the cross section to a 2D 
plane.
How should I do to outline the "contour" ? In this case, the contour  
is a circle. If I don't do anything, I see nothing there ( or a very very 
thin circle)
Any ideas ?
Thanks in advance !!!!

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