CGAL users discussion list

[Sebastien Loriot <>]

 wrote:
> hi Sebastien Loriot
> I have one question about  facet in PW3D ,that whether I give infinite facet 
> in PW3D with your way ?please tell me how obtain infinite  facet in PW3D .
> thanks ,
>
>   
First of all, can you please stop sending me personnal email and use the 
cgal-discuss mailing list.
Infinite cells in the power diagrams correspond to vertices of the dual 
triangulation that are on the convex hull
of associated points.
In CGAL, you just need to consider all incident vertices to the infinite 
vertex to get these cells.

S.

> Sebastien Loriot wrote:
>   
> > sara_mahdavi wrote:
> >     
> > > hi,
> > > why nobody  do answer to Question?
> > >       
> > Your question may be more attractive and easy to read
> > if you had more whitespace and new lines in you request.
> >
> > If I understand the question, you would like to get a facet
> > in a power diagram. As you know a facet is the dual of an edge
> > in the regular triangulation.
> >
> > Then all finite cells incident to an edge give you the points
> > bounding the face.
> >
> > Use the following function to get incident cells:
> > /Cell_circulator / / t.incident_cells ( Edge e)  /(cf. 
> > http://www.cgal.org/Manual/last/doc_html/cgal_manual/Triangulation_3_ref/Class_Triangulation_3.html)//
> > For those that are finite, you can get the dual points using function
> > /Point// rt.dual ( Cell_handle c)
> >
> >
> >
> > /S.
> >
> >     
> > > if  myquestion is easy ,but I don't
> > > know.help me,
> > > thanks
> > > .......................
> > > hi ,all
> > > I need powerdiagram3D , there is in manual cgal two function(rt.dual(
> > > Cell
> > > handle c ), rt.dual( Facet f) ) for  pd3D,rt.dual( Cell handle c ) give a
> > > vertex of pd3D,and rt.dual( Facet f) give a edge of pd3D.it is true that
> > > a
> > > cell of pd3D obtained by convex polyhedron from a tetrahedron,thus I
> > > obtain
> > > cells of pd3D one after one ,I don't know  how obtain  a face in pd3D?is
> > > there a code for pd3D ? please help me.
> > >   
> > >       
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> >
> >
> >     
> Quoted from:  http://old.nabble.com/powerdiagram3D-tp26193589p26193925.html
>
>