CGAL users discussion list

["Laurent Rineau (CGAL/GeometryFactory)" <>]

Le Wednesday 12 November 2014 10:38:03 Qingnan Zhou a écrit :
> Hi Sebastien,
> 
> Changing the kernel to CGAL::Exact_predicates_inexact_constructions_kernel
> does not help in this case.  The closest point and primitive returned are
> still incorrect for many faces.  However, switching to gcc-4.9.2 on linux
> seems to make the problem go away.  Maybe it is related to how CGAL is
> built?
> 
> Is anyone able to reproduce this problem?  I.e. compute the distance
> between face center to the mesh for every face and check the distance is
> 0.  Try it on this mesh: "suzanne.obj
> <https://www.dropbox.com/s/j1xj8nfy68xpdqc/suzanne_tri.obj?dl=0>"

The computation of a distance is a construction. With the kernel 
CGAL::Exact_predicates_inexact_constructions_kernel, then the constructions 
are not exact, and thus the computation of a distance is not exact either. 
That is expected.

Please explain what sort of problem you want to solve, that is impacted by 
this "bug", and we might be able to propose other solutions.

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/