[vtkusers] How to implement "over cut" display?

[minyang]

Hi,
I'm trying to display "over cut" area on mesh(polydata) like this snapshot.
<http://vtk.1045678.n5.nabble.com/file/n5737110/overcut.png>  The mesh is
vtkPolyData. The orientated parallel lights project to mesh, and some area
would be blocked(like red area in snapshot). I want to find this area and
display it. The scalar bar would be useful for display it. Any one know how
to find the area with VTK? thanks in advance.



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