[vtkusers] How to get intensity of a point on a 3D model

[Wenlong Wang]

 Dear all,

I'm new to vtk and I have a 3D model in vtk. I'm trying to get intensity
of a specific point on it. I'm working on it with VC++. The model is
represented by an object of  vtkPolyData.

But I can't find any function to do this. Anyone get any idea?

Thank you very much.
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