CGAL users discussion list

[Ben Supnik <>]

Hi Y'all,

If I insert a poly-line with one segment (two vertices) into an empty 
PCT I get a precondition violation.

Here's what's going on: PCT::insert_incident_faces is being used to 
gather the incident faces to the poly_line.  It does this by circulating 
each vertex of the constraint polyline.

But...if the dimension of the triangalation is 1 (which is the case now 
since we've inserted 2 points) the incident_faces circulator for some 
reason intentionally sets it's face handle to null, which causes 
circulation to blow up.

I haven't found any indication of why the circulator is written that 
way...from what I can tell, circulators around vertices in 
triangulations do return non-finite faces, and in a 1-d triangulation we 
should have a few non-finite faces around each vertex.

Ironically the code that is failing is being called with an empty output 
iterator...that is, the faces we are failing to collect were going to be 
thrown out anyay. :-)

cheers
ben

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