CGAL users discussion list

[Ben Supnik <>]

Hi Y'all,

I am porting GIS code to CGAL's arrangement_2 class, using this:

CGAL::Filtered_kernel<CGAL::Simple_cartesian<NT> >

as my kernel and

CGAL::Gps_segment_traits_2<kernel>

for my Arrangement traits.

As I go around inserting edges into my kernel, eventually I hit a 
precondition failure somewhere in the interior of CGAL::insert_curve.

If I am using the "unassuming" insertion routines (e.g. insert_curve and 
not insert_non_intersecting_curve) should there ever be a precondition 
failure during insert?  Can I simply insert a ton of ugly, poorly placed 
line segments and expect the arrangement to maintian correct topology 
and organization?

If I cannot just insert data, what restrictions are there on the data I 
insert?

cheers
Ben