CGAL users discussion list

Manuel Caroli wrote:
> Hello Hui Ding,

> >     4) Once I construct the triangulation of my object 3D, I need the
> >     normal of every facet of every cell, is there already some functions
> >     who do that? or i need to calculate myself? how?
>
> I'm currently not aware of any such function.

Hi
you can get the points corresponding to the vertices of facet (see 
manual of Triangulation_3 for the orientation of the facet) then use 
CGAL::orthogonal_vector (see Kernel manual)

best
        Monique Teillaud