Good morning, I have just found the following bug report about a mistake in the Q-criterion formula. http://paraview.org/Bug/view.php?id=12858 that is now closed.
However, the "1/2" factor may still be missing. In vtkGradientFilter.cxx, in the VTK/Grahpics directory, on the line 65, t1 should be divided by 2. (Paraview 3.14.1) Should I re-open the bug report ? With best regards, Aurélien
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