CGAL users discussion list

["Laurent Rineau (CGAL/GeometryFactory)" <>]

Le vendredi 10 août 2012 01:48:40 gerth a écrit :
> Hi!
> I have a problem using the constrained Delauny Triangulation in CGAL. So,
> previously I tried to mesh a polygon with the Delaunay_mesher_2. I inserted
> the vertices v1...vN of the polygon using
>    v1=cdt.insert(Point(x1,y1))
>    v2=cdt.insert(Point(x2,y2))
>    ...........
> 
> and the constraints using
>    cdt.insert_constraint(v1, v2);
>    cdt.insert_constraint(v2, v3);
>    ............
> 
> I set the mesh criteria and called refine_mesh() which yielded good results.
> Now i want to insert additional constrained lines within the polygon.
> Typically this constrained lines begin and end either on a vertex
> (v1,...,vN) or somewhere on the constrained lines, that I already inserted.
> The problem arises, if I try to insert a new vertex that lies on a
> constraint edge. In this case I get an error
> 
> Unhandled exception at 0x00435d1e in gui.exe: 0xC0000005: Access violation
> writing location 0x0000000c
> 
> What am I doing wrong? Is it even possible to insert a new vertex that lies
> on a previously defined constrained edge?

Can you give us a small but complete code that shows the error?

By the way, what kernel do you use? It must be a kernel with exact predicates.

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/