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Clip Polyhedra Crashes for N-faced Elements

Shreeraj Jadhav requested to merge shreeraj.jadhav/vtk:clip-polyhedra-crash-nfaced-elements into master

When clipping a dataset that contains n-faced elements (polyhedra), the program crashes. This is due to use of point locator that merges similar points and causes mismatch in number of points and point-Ids stored in the clipped cells. The issue was fixed by updating the cells with new ids where the point locator is used in vtkPolyhedron::Clip function. Also, added a test case for clipping a polyhedra dataset. Addresses issue paraview/paraview#18360 (closed).

Edited by Shreeraj Jadhav

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