[Paraview] question-filter

[Favre Jean]

I recommend using the IntegrateVariables filter which will give the correct answer for wedges and pyramids. The output is put into an unstructured mesh with a single vertex cell, holding the "Volume" in its Cell Data. The implemented is in vtkIntegrateAttributes which triangulates the non-trivial cells into tetrahedra, performing the sum of all volumes within the cell.

The reason you get a -1 using the python calculator can be linked to the implementation of vtkCellQuality returning this->GetUnsupportedGeometry() (equal to -1) for wedges and pyramids.

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Jean
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