CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

mparusinski wrote:
> Hello to everyone
>
> I am using CGAL to perform a triangulation of a inr file, i.e. I am
> performing a 3d mesh generation. Afterwards I need to process the mesh. One
> of the things I want to do is to compute normals to the facets (Triangles)
> then use these normals to see in which direction is each facets facing (up,
> down, front, back, left and right). Is there a tool in CGAL to determine in
> which direction the facet is pointing to? I attached a link to a screenshot
> of a mesh file I have obtained to illustrate the problem. Some of the facets
> are hard to tell on which side they are on. Can smoothing help?
>
> http://img175.imageshack.us/i/examplef.png 
>
> Sincerely yours
>
> Michal Parusinski

Try this:

CGAL::normal

http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Kernel_23_ref/Function_normal.html#Cross_link_anchor_442

S.