[Paraview] How to display the cellNormals as vectors?

[Pat Marion]

Try the Cell Centers filter.  Out.vtu --> Cell Centers --> Glyph.

Pat


On Tue, Apr 16, 2013 at 10:10 PM, <pieter at redpanda.nl> wrote:

> Hi Pat, Berk,
>
> Thanks for your replies. Displaying the cellNormals works fine now, but I
> still can't select the normals computed in my Python script from the
> dropdown menus in the Glyph filter.
>
> I uploaded the relevant .VTU file to my web space, you can find it at
> http://redpanda.nl/Out.vtu (look for the data named "Normal", it has X, Y
> and Z components).
>
> Could you take a look at it?
>
> Best,
> Pieter
>
> > ParaView does a weird thing, in the "Color By" drop down menu, it show an
> > array named "cellNormals" but this array doesn't actually exist on the
> > data
> > object, and it doesn't appear in the information tab.  So, as Berk said,
> > you should apply the Generate Surface Normals filter, and make sure you
> > check the "Compute Cell Normals" check box.  Then you can use the "Cell
> > Centers" to generate point data at the cell centers.  Then you can use
> the
> > Glyph filter to draw the arrows for the cell normals.
> >
> > Pat
> >
> >
> > On Tue, Apr 16, 2013 at 10:03 AM, Berk Geveci
> > <berk.geveci at kitware.com>wrote:
> >
> >> Does the file actually contain normals? I am guessing not. In that case,
> >> do:
> >>
> >> Extract Surface
> >> Generate Surface Normals
> >> Glyph
> >>
> >> If you had a vtp file (polydata) instead of vtu (unstructured grid), you
> >> wouldn't need to Extract Surface.
> >>
> >> -berk
> >>
> >>
> >> On Mon, Apr 15, 2013 at 7:27 PM, Pieter Barendrecht
> >> <pieter at redpanda.nl>wrote:
> >>
> >>> Hi all,
> >>>
> >>> I have just imported a 3D parametric surface in Paraview (from a .VTU
> >>> file generated by a Python script), and I'm wondering how to display
> >>> the
> >>> cellNormals as actual vectors. Since a cellNormal has an X, Y and Z
> >>> component, it should be possible to use these three scalar values to
> >>> create
> >>> a vector, pointing from the corresponding cell.
> >>>
> >>> I know I can create a vector field with the Glyph function, but I'm not
> >>> sure how to continue from there. I cannot select any Scalars or Vectors
> >>> from the two dropdown menus/lists (they are enabled but there is
> >>> nothing to
> >>> select).
> >>>
> >>> Any ideas on how to proceed would be very welcome!
> >>>
> >>> Best,
> >>> Pieter
> >>>
> >>> PS: I'm using Paraview 3.98.1 on a Linux machine.
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> >>
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