CGAL users discussion list

[Gärtner Bernd <>]

Since you are using an exact number type, this could maybe be an actal bug in 
CGAL. Please proceed in the usual way: try to come up with a small running 
program that shows the problem and send it to me, for example. I can forward 
it to the person in charge.
 
Best,
Bernd.

________________________________

Von: Gita Das 
[mailto:]
Gesendet: Mo 27.10.2008 03:28
An: Gärtner Bernd
Cc: 

Betreff: Re:CGAL error: assertion violation!



Hi Bernd,
Thank you for your response.

For Number_type I tried both CGAL::Gmpq and
CGAL::Quotient<CGAL::MP_Float> but didn't get any luck.
Please let me know if you have any other idea.

Regards,
Gita



>If Number_type happens to be float or double, please read the FAQ item
at >http://www.cgal.org/FAQ.html#inexact_NT.

>Best,
>Bernd.

> Hallo CGAL Users,
>
> I was trying to use the CGAL library for boolean operations on 2D
> polygons.Both polygons (P and Q) are simple, CCW and the computed
> areas look
> fine. However, while using intersection I get the following error:
>
> "CGAL error: assertion violation!
> Expr: s != ZERO
> File:
> /home/gitad/Projects/ITK/practice/carotidmesh/trunk/CGAL-
> Boolean/CGAL-3.3.1/include/CGAL/predicates/kernel_ftC2.h
> Line: 140
> terminate called after throwing an instance of 'std::logic_error'
>  what():  basic_string::_S_construct NULL not valid
> Aborted"
>
> A portion of my code:
>
> typedef CGAL::Cartesian<Number_type> Kernel;
> ......
> Polygon_set_2 S;
> S.insert (P);
> S.intersection (Q);
>
>
> Any help would be greatly appreciated.
> --
> Gita Das, PhD
> Department of Medicine (Neurosciences)
> Monash University
> Australia
>
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