[Paraview] Integrate Variables filter generates negative volume for UnstructuredGrid

[Mark Cartwright]

Hello,

  I have an unstructured grid that oddly produces a negative volume - I've looked for degenerate cells, etc.  But cannot find anything obvious.

  The file is attached, it's a very small grid of approx.. 1500 cells, I've removed the data arrays - they integrated negative too - but this did not resolve the issue with the volume being < 0.

   I am look at vtkIntegrateAttributes now and will post if I find anything.

  Happy bug hunting,

Mark



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