CGAL users discussion list

[Thomas Holzmann <>]

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

-- 
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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
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