CGAL users discussion list

[Efraim Fogel <>]

Keith Ealanta wrote:

> I have a pair of polygons A & B, and I need to perform boolean 
> operations on them to produce the polygon C where C is one of A & B, A 
> | B, A|B xor A&B etc. If I understand correctly this means I need to 
> use Nef_Polygons of even Nef_Polyhedrons and then pull it back out 
> into a complex polygon afterwards.

If all you need are regularized operations, check out the 
Boolean_set_operations_2 package.

> Can anyone explain the process by which I make that conversion (I keep 
> getting compile errors like "unable to convert Point_2 to 
> Extended_point.")
>
> Ideally I'd just create Nef_polygons to start with, store my data in 
> them, and be able to perform the boolean operations dirctly on them, 
> but that also seems impossible as I need to be able to create them 
> using the push_back(point_2) operator or it's equivalent, and I've 
> likewise failed to get that to work.
>
> Sorry for what is doubtless a set of noob questions.  This is my first 
> real try to do anything with CGAL.
>
> Any help that can be offered will be greatly appreciated.
>
> Thanks,
>
> Keith Ealanta



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