[vtkusers] Understanding vtkAppendFilter ; interesting results..

[Fcs]

After testing:

- VTK 7.1.1 segfaults when using:

> vtkSmartPointer<vtkStructuredGrid> sgrid = createGrid(i, i+10, j,j+10, k,
> k+10);
> vtkSmartPointer<vtkUnstructuredGrid> ugrid =
> vtkSmartPointer<vtkUnstructuredGrid>::New();
> ugrid->DeepCopy(sgrid);
> filter->AddInputData(ugrid);

- VTK 7.1.1 works with:

> vtkSmartPointer<vtkStructuredGrid> sgrid = createGrid(i, i+10, j,j+10, k,
> k+10);
> filter->AddInputData(sgrid);

- VTK 8.1.1 works with both, with the correct number of cells.

So it looks more like a bug with VTK 6.3 and 7.1.1.

Do the VTK developers release patches for old VTK versions? Is it worth
filing a bug report...?



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