CGAL users discussion list

["Laurent Rineau (CGAL/GeometryFactory)" <>]

Le vendredi 30 août 2013 07:51:04 gupta61 a écrit :
> Hi,
> 
> I was wondering if it is possible to have a surface defined by Polyhedron_3
> with different/opposite normal orientation of facets?
> 
> All facets of my surface are triangles. My understanding is that the normals
> of all the triangles/facets should point in the same direction. And if this
> condition is violated, I should get an error. Am I missing something here?

No. If two facets of a polyhedron share an edge, then the orientations of the 
two facets must be coherent.

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/