CGAL users discussion list

[Ben Supnik <>]

What Kernel are you using?

Panagiotis Foteinos wrote:
> Hello everybody.
>
> I observed something strange.
>
> If a triangle t(p, q, r) is close to a degenerate one with the value, 
> however, of the predicate t.is_degenerate() always being FALSE, then 
> during the calculation of CGAL::squared_radius(p, q, r), the assertion:
>
> ********************************************************************************************
>    terminate called after throwing an instance of 
> 'CGAL::Assertion_exception'
>   what():  CGAL ERROR: assertion violation!
> Expr: ! CGAL_NTS is_zero(den)
> File: /scratch/local/CGAL-3.4/include/CGAL/constructions/kernel_ftC2.h
> Line: 60
> ********************************************************************************************
>
> is trigerred, and the calculation fails.
>
> Unfortunately, this error is difficult to be reproduced, but sometimes 
> it happens.
>
>
> Is this behavior expected? Is it relevant to the fact that the triangle 
> is almost degenerate?
>
>
> Thank you,
> Panagiotis

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