CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 06/04/2014 04:46 PM, Kobi Gurkan wrote:
> Hi Sebastien,
>
> I appreciate your response - the implementation explained what I needed.
> Do you think what I suggested it possible? Constructing such a 3D
> arrangement of planes using this method?

Indeed, it should be working.

Sebastien.

> On Tue, Jun 3, 2014 at 9:23 AM, Sebastien Loriot (GeometryFactory)
> <
>  
> <mailto:>>
>  wrote:
>
>     On 05/31/2014 03:34 PM, Kobi Gurkan wrote:
>
>         Hello,
>
>         I'm trying to implement a limited 3D arrangement with multiple
>         Nef_polyhedron_3.
>         Before approaching it, I'm struggling with the concept of "shells",
>         specifically on how to iterate on shells of a volume.
>           From what I understand, iterating using shells_begin() would
>         give me
>         each time a shell, which is, from the documentation:
>         A |Shell_entry_iterator| is assignable to |SFace_handle|.
>         But, I'm not dealing with SFaces at all - I want the regular
>         Halffaces.
>         Is there a better example for a case like mine or an explanation? I
>         would really appreciate it.
>
>         Thanks,
>         Kobi
>
>     You can use the function
>
>     void    visit_shell_objects (SFace_const_handle f, Visitor &V) const
>
>     
> http://doc.cgal.org/latest/__Nef_3/classCGAL_1_1Nef____polyhedron__3.html#__a7a5e49319c66778abbf3cb6e702ca__246
>     
> <http://doc.cgal.org/latest/Nef_3/classCGAL_1_1Nef__polyhedron__3.html#a7a5e49319c66778abbf3cb6e702ca246>
>
>     Visitor must provide:
>            void visit(Halffacet_const_handle) {} //in you case this one
>     should no be empty
>            void visit(SFace_const_handle) {}
>            void visit(Halfedge_const_handle) {}
>            void visit(Vertex_const_handle) {}
>            void visit(SHalfedge_const_handle) {}
>            void visit(SHalfloop_const_handle) {}
>
>     You can also look at the implementation of the function
>     in the file CGAL/Nef_3/SNC_const___decorator.h.
>
>     Sebastien.
>
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