reverse engineering point indices

[gvwilson at nevex.com]

Hi.  Both vtkStructuredPoints and vtkRectilinearGrid have methods
ComputePointId() that'll convert IJK coordinates to a unique point ID.  I
want to go in the other direction, i.e. I have a point ID, and I want the
IJK coordinates.  I can't find a method to do this --- can someone please
point me in the right direction?
Thanks,
Greg




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