CGAL users discussion list

So you are trying to compute the intersection between 'first_polygon'  
and all the polygons in the range 'polygons.begin(), polygons.end()'.  
Could you please provide the data that causes the problem. It would be  
nice if you narrow it down first.

Quoting "BBB HHH" 
<>:

> Hello,
>
> I am trying to compute the intersection of some polygons in 2D. For  
> that purpose, i am using the 2D Regularized Boolean Set-Operations  
> of CGAL 3.4. I am also using VS2005 under Windows XP SP3.
>
> For some polygons which seemto be correct (CCW orientation,  
> non-degenerate, simple, bounded), i have the following error:
>
> CGAL error: precondition violation!
> Expression : cv.is_in_x_range (p)
> File       : c:\program  
> files\cgal-3.4-beta1\include\cgal\arr_segment_traits_2.h
>
> Line       : 481
> Explanation:
> Refer to the bug-reporting instructions at  
> http://www.cgal.org/bug_report.html
>
>
> I am using an exact kernel  
> (CGAL::Simple_cartesian<CGAL::Lazy_exact_nt<Gmpq> >). The  
> problematic line of code is that computing the intersection of some  
> polygons
>
> std::vector<Polygon_2>        polygons;
> // Fill the list of polygons
> // Initialize the polygon set with a polygon
> Polygon_set_2 S(first_polygon);
> S.intersection(polygons.begin(), polygons.end());
>
> Thanks in advance for your help
> Hichem Barki
>
>
>
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