CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Costas Tsirogiannis wrote:
> Greetings,
>
> I have a problem with run-time errors coming from an unorthodox use of 
> handles:
>
>   I make use of a triangulation and of an augmented polyhedron_3 object. 
> This augmented polyhedron
> is a refinement of the surface represented by the triangulation : as 
> some algorithm goes on, new edges
> are added on what used to be the triangular faces. It is important that 
> the halfedges,faces and vertices
> on the polyhedron that originate from features of the triangulation 
> should point to the corresponding triangulation
> features.  Thus each feature stores a handle of the original 
> triangulation object: a polyhedron vertex stores a handle
> to the original triangulation vertex of the same coordinates, a halfedge 
> stores a handle to the triangulation edge or
> face on which it lies etc.
>  When a feature is refined eg a halfedge is split, these stored handles 
> of triangulation features are copied to
> the newly created features. And then segmentation faults appear. 
What do you use to split halfedges ? (the underlying question being how
your handles are set)

> Specifically, things go wrong when there is an attempt
> to access the handle member object of the new feature outside of the 
> function that created the feature (and copied the
> handle object to it).  Any ideas for what could fix this?
>
> thanks
>
> Constantinos