[vtkusers] vtkPolydataNormals

[David Doria]

On Fri, Nov 19, 2010 at 2:53 PM, Sara Rolfe <smrolfe at u.washington.edu> wrote:
> Hello,
>
> I'm using vtkPolydataNormals to calculate the normal vectors on the surface
> of a closed mesh.  What I wanted to get was the normal vectors, pointing
> out, from each point on the surface.  However, what I'm getting is normal
> vectors, half of which point in toward the mesh surface, and half which
> point out.  Is there a way to correct this?
>
> I'm attaching a image showing some of the normals, where the problem can be
> seen.
>
> Thanks,
> Sara

I implemented Hoppe's normal orientation algorithm here:
http://www.midasjournal.org/browse/publication/708

Arnaud Gelas has made some major improvements that can be found here:
https://github.com/daviddoria/daviddoria-vtk/tree/VTK-PointSetNormalEstimation

Good luck,

David