CGAL users discussion list

[Thomas Holzmann <>]

So if I additionally add the cell neighbors and the infinite cells, it 
should work like I did it?

Thanks!

Thomas


On 11/29/2016 05:26 PM, Andreas Fabri wrote:
> Not only you are responsible for the neighbor, but CGAL has
> also the infinite cells, incident to the infinite vertex,
> in case tetgen has no infinite vertex.
>
> andreas
>
>
> On 29/11/2016 17:23, Thomas Holzmann wrote:
> > Hi all,
> >
> > I created a constrained Delaunay triangulation in 3D with Tetgen and
> > want to convert it now to a CGAL triangulation. As it is no Delaunay
> > triangulation anymore, I try to create an unrestricted
> > CGAL::Triangulation_3<CGAL::Exact_predicates_inexact_constructions_kernel,CGAL::Triangulation_data_structure_3<Vbh, 
> >
> > Cb> > wit the data from the CDT.
> >
> > When I use the "normal" insert function to incrementally create the
> > triangulation, I cannot directly influence the structure of the
> > triangulation and therefore, as I want to keep the structure, this is
> > not an option for me (am I right?).
> >
> > So I tried to directly add the vertices and cells in the TDS using:
> >
> > v1 = cgalTriangulation.tds().create_vertex(cgal_pt);
> > ...
> > cell = cgalTriangulation.tds().create_cell(v1, v2, v3, v4);
> >
> > However, it seems as if the cells are not added.
> >
> > Here are the statistics of the triangulation after adding the data:
> >
> > number_of_vertices() = 253792
> >
> > number_of_finite_facets () = 0
> >
> > number_of_finite_cells () = 0
> >
> >
> > cgalTriangulation.is_valid(true) says:
> > valid data structure
> > valid triangulation
> >
> > Do I also need to set the cell neighbors and/or facets? Or am I
> > completely wrong with my approach?
> >
> > Any help would be appreciated!
> >
> > Thomas
> >
> > --
> > ====================================================
> > Dipl.-Ing. Thomas Holzmann
> > TU Graz - Institut fuer Maschinelles Sehen und Darstellen
> > Graz University of Technology - Institute for Computer Graphics & Vision
> > Inffeldgasse 16/II, 8010 Graz, Austria
> >
> > http://www.icg.tugraz.at/
> > phone: +43 316 873 5091
> > ====================================================

--
====================================================
Dipl.-Ing. Thomas Holzmann
TU Graz - Institut fuer Maschinelles Sehen und Darstellen
Graz University of Technology - Institute for Computer Graphics & Vision
Inffeldgasse 16/II, 8010 Graz, Austria

http://www.icg.tugraz.at/
phone: +43 316 873 5091
====================================================