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[tang <>]

Dear all,

I know that join_vertex in CGAL can merge two vertice into one. CGAL said
that 
P.join_vertex ( Halfedge_handle h) joins the two vertices incident to h. The
vertex denoted by h->opposite() gets removed. 

http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Polyhedron_ref/Class_Polyhedron_3.html

Now my problems are:
1) what is h->opposite() when we look from that figure?
2) is it possible to specify anyone of two vertices at the end of h to be
removed, instead of h->opposite() being removed?

Thanks,
Zhanghong Tang




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