[vtkusers] vtkExtractGeometry linking to original polydata ID

[Hong Yi]

Hello,

I have used vtkExtractGeometry class to extract a portion of polydata within a cube successfully. I am currently investigating to get the original IDs of extracted points to display to the user so that the user can link the extracted points to original data. Could someone give me a hint on how to do this?

Thanks,

Hong
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