[vtkusers] eliminate invalid points generated by vtkProbeFilter

[Dan Lipsa]

Hi,
I am using a vtkPointSource to generate radom points and then I sample a
dataset at those points using vtkProbeFilter.

However, some of the generated points are outside of the dataset so are
marked invalid using the vtkValidPointMask array.

What is the best way to obtain a new dataset with the invalid points
removed.

Thank you very much,
Dan
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