[vtkusers] How to get neighbor points in a polydata without cells?

[soheilghafurian]

Thank you very much. But I found I have another problem prior to that. When I
send the polydata to a vtkCurvatures filter, I get the error that "No
points/cells to operate on" exist. I update the polydata before use.

Do you have any idea why this happens?

Thanks a lot for your time

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