[vtkusers] How to use 'vtkCurvatures' class?

[B. C.]

Please, i need your help to finish my work!!!
I use 'vtkCurvatures' to compute curvatures at each point of my polydata structure. 
I want to save only the Maximum curvatures and display only those which are > some_value (0.5 for example).
Can someone tell me how to do this?
Please heeeeeeeeelp!!!

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