[vtkusers] Visualize cell normal vector of polydata

[Cory Quammen]

On Tue, Nov 28, 2017 at 10:59 AM, Favre  Jean <jfavre at cscs.ch> wrote:
>
> 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

Yep, I agree. The vtkGlyph3D filter operates only on input point data,
so you will definitely need to add a vtkCellCenters filter before the
glypher. vtkCellCenters copies cell data to point data in its output,
which is exactly what you need for vtkGlyph3D.

Cory

> -----------------
> Jean/CSCS
>
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-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.