CGAL users discussion list

[Charlie Kehoe <>]

On Wed, Feb 15, 2012 at 11:10 PM, Sebastien Loriot (GeometryFactory) <> wrote:

1. I don't have normals for my points. My surface is pretty smooth, so
normal estimation should work, but I couldn't find the documentation that
actually described how to do this. Can anyone point me in the right
direction? 

See this package:
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Point_set_processing_3/Chapter_main.html

Sebastien.

 

Thanks Alex and Sebastien for your help. I stitched the normal-estimation example together with the surface reconstruction one, but got a sphere with a pretty pock-marked surface. It looks as if some of the normals are getting passed through wrong. Here's my code:

http://pastebin.com/WThHKx6p

I'm happy to pass along the output vrml as well, but of course it's sizable. I also tried fiddling with the number of nearest neighbors to use. If I make it smaller, it either can't solve the poisson equation, or gives *really* weird output. If I make it bigger, the surface is smoother, but still has lots of artifacts. Is this just a weakness of the normal estimation algorithm? Shouldn't fitting planes to the neighbors produce a pretty smooth sphere?

- Charlie