CGAL users discussion list

[Manuel Caroli <>]

Dear Song Lin,

Have you tried
  as.classify( *vit, 0 );

Anyway if you put 0 as alpha value classify should always return 
EXTERIOR, I suppose.

best

Manuel

On 11/04/10 14:15, Song Lin wrote:
> Thank you very much for your reply.
>
> I have noticed the function classify(...) but I cant find out how to
> convert the iterator type
>
> Alpha_shape_3::Finite_edges_iterator vit;
>
> to the type
>
> Alpha_shape_3::Edge
>
> that the function
>
> as.classify( Edge e, FT alpha = get_alpha())
>
> needed.
>
> I tried
> as.classify( vit, 0)
> and
> as.classify( as(vit), 0)
> but both don't work.
>
> I have read Part IX: Triangulations and Delaunay Triangulations but
> can't find a solution, and I cant find an example similar to this. I'm a
> new user of CGAL and I'm sorry for not reading the manual carefully. But
> I fount it really hard for me to find what I need in the manual of so
> many pages.
>
> Can you help me again for this problem? And I will really be appreciated
> if you can give me any suggestions on how to get start with CGAL as a
> beginner.
>
> Lin
>
>
>
> 在 2010-04-11日的 11:55 +0200，Laurent Rineau (GeometryFactory)写道：
> > Le Samedi 10 Avril 2010 16:20:14, Song Lin a écrit :
> > > Hi,
> > >
> > > As Weighted_alpha_shape_3 is a subset of Regular_triangulation_3, anyone
> > > knows how to decide which cell(face,edge...) of Triangulation_3 is
> > > included in Alpha_shape_3 and which is not?
> >
> > Such questions have answers in the manual. Have a look at the classify(...)
> > functions of Alpha_shape_3:
> > http://www.cgal.org/Manual/3.5/doc_html/cgal_manual/Alpha_shapes_3_ref/Class_Alpha_shape_3.html
> >
> > --
> > Laurent Rineau, PhD
> > Release Manager of the CGAL Project       http://www.cgal.org/
> > R&D Engineer at GeometryFactory           http://www.geometryfactory.com/