CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 04/03/2014 06:00 PM, Zohar wrote:
> I'm not clear about the edge to be collapsed selection process. I'll try to
> understand it from the code, but I think that the documentation can be
> clearer about this. I have two types of constraints on edges:
>
> 1. A constraint that isn't going to change, and this edge would never be
> collapsed.
> 2. A temporary constraint that is relevant to the current mesh state, and
> might change (be lifted/removed) later, when the mesh changes.
>
> I put both types in EdgeConstraints::is_constrained(), but clearly it's a
> mistake. For example, in Edge_collapse_visitor_base::OnCollected() it seems
> that constrained edges (even temporary) would never be checked again. So I'm
> guessing that temporary constraints should be added to
> Edge_collapse_visitor_base::OnSelected() or MyPlacement::operator().

If you put an edge as a constrained it will not be inserted in the
edges to be removed. If your constrained edge changes over the time,
the only way that they get in the queue is if they are in the 2-ring
neighborhood of an edge to be collapsed.

There's no mechanism watching edges being unconstrained.

I'm not sure to understand what you want to do.

Sebastien.

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