CGAL users discussion list

[Peter Hachenberger <>]

Hi Shi,

Polyhedron_3 offers an interface that allows enhancing its functionality. Instead of
adding a function to the HDS, you write a class C that inherits from Modifier_class<HDS>
an has a function delegate(HDS& hds), which implements the function you need. Then
you can use this function on a polyhedron P by calling

Polyhedron_3 P;
C c;
P.delegate(c).

You can find more on this mechanism in

http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Polyhedron/Chapter_main.html#Subsection_12.6.2

Peter

-----"Shi Yan" <> wrote: -----

To:
From: "Shi Yan" <>
Date: 08/22/2008 03:14AM
Subject: [cgal-discuss] Re: how to remove a vertex from a polyhedron.

so this is how i do vertex removal:

i hacked the polyhedron_3.h and added this function

     void eraseIsolatedVertex(Vertex_handle v)
     {
          HalfedgeDS_decorator<HDS> D(hds);
       CGAL_precondition(v->halfedge()==0);



       D.vertices_erase(v);
     }

i don't think this is the right way to do this. but this is the only
way i can think of.

On Thu, Aug 21, 2008 at 4:43 PM, Shi Yan <> wrote:
> hello guys,
>
> i have some isolated vertices in my polyhedron model that link to no
> half-edges. now i want to remove them. but it seems that cgal has no
> vertex erase function. so how should i do that ? thank you very much.
>
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