CGAL users discussion list

[Monique Teillaud <>]

Shuchu Han wrote:
> Thanks  a lot!   And I have another question :P

Hi

> Currently, I try to represent several shell structured tetrahedral 
> meshes that has two boundary surface. for example, a thin-wall sphere. 

I am not sure I fully understand your needs, but I guess that the CGAL 
3D mesh generation package could help you more than the 3D triangulation 
package alone.

> I am using the incremental build method from the un-documented method 
> described in " CGAL\Triangulation_incremental_builder_3.h"; 
> Although it can not pass the "is_valid()" test, it works quite fine. my 
> code can iterative visit the edges, cells and vertices;
>
> however, problems occur recently when i handle a shell structured 
> tetrahedral mesh which has shape edges. specifically, it has two 
> boundaries, and each of them has polycube shape ( i got the surface mesh 
> by polycube mapping).
> When my old code iterative visit the finite edges of such a shell 
> tetrahedral mesh, it seems jump into an infinite loop for looking the 
> next edge.  (when use Triangulation_3::Finite_edges_iterator);

well, if your triangulation does not pass the is_valid() test, there is 
a high probability that things don't work...

> Sir,  would u mind to give me an explanation about the theory of Edges 
> of CGAL::Triangulation_3?  or recommend some papers about this.  And Is 
> there any correct method to build a Triangulation_3 from an input file?

No need to look at papers, the CGAL manual of CGAL::Triangulation_3 
(both user and reference manual) should be enough.

Best regards,
--
Monique Teillaud
INRIA Sophia Antipolis - Méditerranée
http://www.inria.fr/sophia/members/Monique.Teillaud/