CGAL users discussion list

[Manuel Caroli <>]

Hi Dennis,

Dennis Endt wrote:
> Last Question:
>
> Finite_facets_iterator it:
> I would like to get the edges of a facet. What`s the correct method for
> this?

I don't think this is the right question to ask. As you will have 
figured out from the manual neither edges nor facets are stored 
explicitly in the data structure.
So an edge is nothing but a triple (Cellhandle c, int i, int j) where 
c->vertex(i) and c->vertex(j) are the vertices connected by the edge.
So if you want to know these endpoints this is the answer to your question.

Be aware of the strong separation between geometric and combinatorial 
primitives at this point: vertices, edges, facets, and cells are purely 
combinatorial primitives. That is also the reason why they don't contain 
geometric information like e.g. coordinates, and why you do not find 
them in the kernel. On the other hand you have points, segments, 
triangles, tetrahedra etc. as geometric primitives.

hope this helps

Manuel