CGAL users discussion list

[kyewong <>]

Thanks Seb.
However, using CGAL::Exact_predicates_exact_constructions_kernel would require me to add CGAL::to_double when converting a "double" type data to a corresponding data type in cgal data types, which is mentioned in https://lists-sop.inria.fr/sympa/arc/cgal-discuss/2009-05/msg00165.html.
That way, I'll have to do a lot of modifications to my project...Is there any other smart way to avoid the problem please? Thanks!

On Thu, Oct 6, 2011 at 4:39 PM, Sebastien Loriot (GeometryFactory) [via cgal-discuss] <[hidden email]> wrote:

See:

http://www.cgal.org/FAQ.html#inexact_NT

You should try with CGAL::Exact_predicates_exact_constructions_kernel.

Sebastien.

kyewong wrote:

> Hi, I've met an issue(probably a numerical issue) in CGAL::intersection.
> When I let the data type of vertex coordinates of Polygon_2 to be "double",
> and there may be more than 6 digits after the decimal point (eg,
> 2666.666748), calling CGAL::intersection would cause an error in the "sweep"
> function in the Basic_sweep_line_2.h file.
> However if I reduce the precision (eg, 2666.67), CGAL::intersection works
> very well.
> The kernel I use is CGAL::Cartesian<double>.
> I'm wondering if it is caused by numerical issue of the "double" type. If
> yes, how could I rapidly modify the kernal? Shall I use the
> CGAL::Exact_predicates_exact_constructions_kernel or change "double" to
> "float" ? Since my program relies on CGAL very much and is of relatively big
> size, I would like to minimize the changes to related definitions of the
> variables.
> Could anyone help me please? Thanks very much!
>
>
> --
> View this message in context: http://cgal-discuss.949826.n4.nabble.com/Issue-on-CGAL-Polygon-2-Intersection-tp3877407p3877407.html

> Sent from the cgal-discuss mailing list archive at Nabble.com.
>

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Kai WANG

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