CGAL users discussion list

[Andreas Fabri <>]

Hi Panayiotis,

What would be helpful:  A bug.cpp, plus the data set, plus information
on your platform.  Then we can try to reproduce it.   The smaller the
program and data set is the better.

andreas


panayiotis foteinos wrote:
> Hello all.
>
> I use CGAL to get a 2D Contrained Delaunay Triangulation (CDT) of a PSLG.
>
> Since CGAL returns only the CDT of the convex hull of the input points (that 
> belong to the PSLG), I then apply a post-processing method to remove all the 
> triangles outiside the PSLG.
>
> The resulting mesh is correct: correct number of (infinite/finite) edges, 
> correct number of (infinite/finite) faces, and correct interconnection among 
> all the faces. The visualization of the resulting mesh further confirms its 
> correctness.
>
> However, the mesh does not pass the is_valid() assertion method provided by 
> CGAL:
> -----> is this because the resulting mesh does not triangulate the convex hull 
> (as expected) of the PSLG, or there is a well-hidden error in the output mesh 
> that only the CGAL assertion method can detect?
>
> Now, lets try to play with this output mesh, depsite the fact the CGAL 
> assertion method complains. Strange things again. 
>
> If I insert a point inside the PSLG, the updated mesh is no more invalid: it 
> passes any kind of assertion tests. However, when I insert a point outside 
> the PSLG, the updated test does not still pass the assertion test.
> ---> Any ideas?
>
>
> I would really appreciate any help,
> Thank you very much,
> Panagiotis Foteinos