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Hallo,
I was trying to use the CGAL library for boolean operations on 2D polygons.
Let's say I have three polygons P (102 vertices), Q(42 vertices) and R
(255 vertices). All of them are closed, simple, CCW. I would like to
find the overlapping area between P & Q, and also between P & R.

I use the follow code:

Polygon_set_2 S;
S.insert (P);
S.intersection (Q);

With P & Q, it works fine but with P & R, I get the follow. error
message. I am not sure how to resolve this problem- any help/suggestion
would be greatly appreciated.

Thanks and Kind regards,

Gita Das
Monash University
Australia
 
"CGAL error: precondition violation!
Expr: comp_f(object, nodeP->object) != LARGER
File:
/home/gitad/Projects/ITK/practice/carotidmesh/trunk/CGAL-Boolean/CGAL-3.3.1/include/CGAL/Multiset.h
Line: 2141
terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct NULL not valid
Aborted"