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<div>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.</div>
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for reference:<br>
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<div class="BodyFragment"><a href="https://gitlab.kitware.com/paraview/paraview/blob/master/ParaViewCore/VTKExtensions/Default/vtkPVGlyphFilter.cxx" target="_blank">https://gitlab.kitware.com/paraview/paraview/blob/master/ParaViewCore/VTKExtensions/Default/vtkPVGlyphFilter.cxx</a></div>
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<div class="PlainText">thus my suggestion is to insert a vtkCellCenters() in your pipeline, before the Glyph</div>
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<div class="PlainText">-----------------<br>
Jean/CSCS</div>
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