[vtkusers] Visualize cell normal vector of polydata

[Favre Jean]

I am having doubts about the fact that one can *directly* generate cell-centered normal vectors. Looking at the source of ParaView, I see that if the association is FIELD_ASSOCIATION_CELLS, then vtkPVGlyphFilter::UseCellCenters() returns TRUE and a vtkCellCenters() is created to act as input.

for reference:

https://gitlab.kitware.com/paraview/paraview/blob/master/ParaViewCore/VTKExtensions/Default/vtkPVGlyphFilter.cxx

thus my suggestion is to insert a vtkCellCenters() in your pipeline, before the Glyph

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Jean/CSCS
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