[vtkusers] VTKPolyData Inside Points

[Sam]

Hello,

Given a point in VTK Space, I want to know whether this point is inside or
outside a VTKPolyData model.  I have tried using vtkSelectEnclosedPoints but
it is slow and does now seem to function properly.  

Instead, I would like to do this following:

I want to cast a ray from the give point and count how many times I cross
the VTKPolyData model's surface.  How do I do this?

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