CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 03/21/2012 05:04 PM, Juan Carlos Lopez Alfonso wrote:
> Hi,
> thank you for your answer, but this solution don't solve my problem,
> because I need to iterate the set of tetrahedrons which are incident
> in the infinite vertex. Some thing like this:
>
> T.incident_cells(T.infinite_vertex(), std::back_inserter(infinite_cells));
>
> and for this reason I need to eliminate some of them of the
> triangulation in order to have other external tetrahedrons.
>
> any other idea?
Maybe removing one on the two points that are too close from the 
triangulation?

Sebastien

> Best Regards
> Juan Carlos
>
> On Wed, Mar 21, 2012 at 4:51 PM, Mariette Yvinec
> <>
>   wrote:
> > One way to do it
> > is  to instantiate the triangulation with
> > a base cell class of type Triangulation_cell_base_with_info_3
> > that supports additionnal information stored in the triangulation cells.
> > Then you may add a boolean in each cell
> > to mark tetrahedra inside/outside the domain of interest.
> >
> >
> > Le 21/03/12 12:32, Juan Carlos Lopez Alfonso a écrit :
> >
> > Hi all,
> >
> > I have a question related with a delaunay triangulation. I have
> > triangulated a set of points and I want to know how I can remove some
> > tetrahedrons of this triangulation.
> >
> > For example I have the following triangulation: Delaunay T;
> > and I have iterated over all tetrahedrons and when one edge of one of
> > them is more than a defined threshold, I want to eliminate this
> > tetraheron of T. The idea is eliminate external tetrahedrons in order
> > to obtain a nonconvex domain triangulation. I need eliminate this
> > tetrahedrons of T, because I need to iterate the set of tetrahedrons
> > which are incident in the infinite vertex. Some thing like this:
> >
> > T.incident_cells(T.infinite_vertex(), std::back_inserter(infinite_cells));
> >
> > Is there any form to eliminate tetrahedrons of T?
> >
> > Best regards
> > Juan Carlos
> >
> >
> > --
> > Mariette Yvinec
> > Geometrica project team
> > INRIA  Sophia-Antipolis