The ParaView documentation about the Mesh Quality filter (5. Filtering Data — ParaView Documentation 5.11.0 documentation) currently does not explain the meaning of all quality measurements that can be displayed. For example, for
HexQualityMeasure, what is distortion and stretch?
Thanks a lot,
(Spiros Tsalikis (Kitware))
This is the code that is used by the mesh quality filter.
I hope it helps