[vtkusers] extract curvature value of point.

[Moti Freiman]

hello!
i'm trying to develop some algorithm for my thesis.
now i need to extract the curvature value at each point of 3d volume which represented by vtkPolyData object.
i found the class vtkCurvatures, but i did not understand how i get the curvature value at each point.
when i check the polydata output object i got nothing.

thank you
moti freiman
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