CGAL users discussion list

Hi Henrique,

As the manual says, the 3D triangulation data structure stores a 
triangulation of the topological sphere S^{d} in R^{d+1}.
For more details, see the introduction of the user manual (chapter 28 or 
27).
You can still play with functions like create_cell but as mentioned in 
the reference manual, then you may violate some properties tested by 
is_valid.

Still, seen from your few words, what you are trying to do could 
probably work. You must make sure that you restore all incidence and 
adjacency relations in a proper way.
You may want to look at the source code of insert_in_hole() of 
Triangulation_data_structure_3 to see an example of code doing something 
similar. Or maybe the remove() function of Delaunay_triangulation_3.
Hope this helps.

Best regards,
        Monique Teillaud

Henrique Campos Fernandes wrote:
> Hi colleagues,
>  
> I'm working in a facet recovery procedure in order to implement a 
> constrained triangulation in 3D. To achieve this, I delete some 
> tetrahedrons that intercept the missed facet, then I obtain a concavity. 
> After this, I retriangulize this concavity separately (in 
> another triangulation). The problem is how to join the two 
> triangulations. I'm trying to use t.create_cell(Cell_handle) to add the 
> new tetrahedrons, one by one, in the first triangulation but it becomes 
> invalid.
>  
> Could you help me?
>  
> Thank you.
>  
> --
> Henrique Campos Fernandes
> Federal University of Minas Gerais - Brazil 
>