CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

You cannot have non-manifold edges in a halfedge data structure by
definition.

You need to use something more general like a linear cell complex for
example if you want to have non-manifold edges.

https://doc.cgal.org/latest/Linear_cell_complex/index.html

Sebastien.

On 06/22/2018 12:24 PM, sergio campo wrote:
> What happen if the structure has non-manifold edges, it will work?
>
> On Fri, Jun 22, 2018 at 11:35 AM, Sebastien Loriot (GeometryFactory) 
> < <mailto:>> wrote:
>
>     If you have a index associated to faces, then from a halfedge you
>     can access the faces using
>
>     halfedge_descriptor h;
>     face_descriptor f1 = face(h, mesh);
>     halfedge_descriptor h_opp = opposite(h, mesh);
>     if (!CGAL::is_border(h_opp, mesh))
>        face_descriptor f2 = face(h_opp, mesh);
>
>
>     with halfedge_descriptor and face_descriptor being nested types of
>     boost::graph_traits<Mesh_type>
>
>     To associate an id to a face, you can use internal property (built-in
>     with Surface_mesh or with a traits with ids like
>     CGAL::Polyhedron_items_with_id_3 [1]). In general you can also use
>     dynamic properties [2]
>
>
>     Sebastien.
>
>     [1]
>     
> https://doc.cgal.org/latest/BGL/classCGAL_1_1Polyhedron__items__with__id__3.html
>     
> <https://doc.cgal.org/latest/BGL/classCGAL_1_1Polyhedron__items__with__id__3.html>
>     [2] https://doc.cgal.org/latest/BGL/index.html#title25
>     <https://doc.cgal.org/latest/BGL/index.html#title25>
>
>
>     On 06/22/2018 10:48 AM, sergio wrote:
>
>         I have the following loop iterator:
>
>         void printAdjancenFaceToEdge(Polyhedron mesh)
>         {
>               std::vector<int> nBorder(mesh.size_of_vertices(), 0);
>               for (Polyhedron::Halfedge_const_iterator he =
>         mesh.halfedges_begin(); he
>         != mesh.halfedges_end(); he++) {
>                   if (!he->is_border())
>                       continue;
>
>                   // print here ids
>               }
>
>
>               return true;
>         }
>         is it possible to print the adjacent faces index of every edge?
>
>
>
>         --
>         Sent from: http://cgal-discuss.949826.n4.nabble.com/
>         <http://cgal-discuss.949826.n4.nabble.com/>
>
>
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