CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

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!
>
>
> --
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