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[Kobi Gurkan <>]

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?

On Tue, Jun 3, 2014 at 9:23 AM, Sebastien Loriot (GeometryFactory) <> 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#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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