[vtkusers] Visualize cell normal vector of polydata

[Cory Quammen]

If their is a scalar value that controls which arrow glyphs you want
to see, you can use vtkThreshold applied to vtkGlyph3D to exclude
those you don't want to see.

Cory

On Wed, Nov 29, 2017 at 6:42 AM, woshizyc at gmail.com <woshizyc at gmail.com> wrote:
> Thanks for your reply. It works.
>
> The normals of the triangles are correct. What if I want to visualize only
> some of the normals?
> Can I just modify the normal vector of the point data of centers?
> I tried to set all the normal vectors that I do not want to visualize to
> (0,0,0). However, it does not work out as I expected. Please see the
> attached figure.
>
> I want to set the vectors of red regions to be zero and leave the vectors of
> the blue regions untouched.
>
> I set the normals of the red regions to be zero.
>
> I got the attached figure, which is not what I want
>
> Thanks a lot.
>
>
>
>
> ________________________________
> woshizyc at gmail.com
>
>
> From: Favre Jean
> Date: 2017-11-29 00:21
> To: woshizyc at gmail.com; Cory Quammen
> CC: vtkusers
> Subject: RE: [vtkusers] Visualize cell normal vector of polydata
> more specifically:
>
> centers = vtk.vtkCellCenters()
> centers.SetInputConnection(normals.GetOutputPort())
>
> glyph.SetInputConnection(centers.GetOutputPort())
>
>
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-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.