CGAL users discussion list

[Alexander Kobel <>]

Gmain wrote:
> Hi all,
>
> I´m using CGAL::do_intersect(Kernel::Triangle_3 T1,Kernel::Triangle_3 T2) as a
> test before starting the real intersection process.
>
> My Kernel is:
> typedef CGAL::Exact_predicates_inexact_constructions_kernel       Kernel;
>
> My Question: Is the result of the function CGAL::do_intersect exact or do I
> need to take:
> typedef CGAL::Exact_predicates_exact_constructions_kernel       Kernel;
> as Kernel?

Hi.

You might want to look at this thread (similar question for 
segment-triangle-intersections):
https://lists-sop.inria.fr/sympa/arc/cgal-discuss/2009-07/msg00038.html

In essence, if you only need the do_intersect to yield perfectly exact 
results, the inexact_constructions_kernel will suffice, but you might 
get unpleasant results when performing the actual intersections afterwards.


Cheers,
Alexander