CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

You mix things up.

When you do boolean operations, you are using Nef_polyhedron_3 I guess.
This class must be used with an exact number type.

Then, you are using a Polyhedron_3 with, I guess, a floating point 
number type. So there is a conversion which done that might introduce
the self-intersections.

The edge simplification algorithm cannot work correctly if there are 
self-intersections.

Sebastien.


On 10/05/2012 02:07 AM, tang wrote:
> Dear Dr. Loriot,
>
> Thank you very much for your kindly reply. I will test the self-intersection
> plug in and try to know how to let it work on my case.
>
> On the other hand, the real case is that I didn't output the OFF file and
> let the function 'SimplifySurfaceMeshCGAL' read OFF file. My work is to
> create cylinders and boxs (of cause they are all polyhedrons) and then let
> the CGAL to do boolean operations to combine all these objects to the final
> one. The funcitons 'SimplifySurfaceMeshCGAL' directly works on the final
> polyhedron. My questions are:
> 1) for the raw OFF file (a1.off) outputted by CGAL, what could lead to
> 'self-intersection' and duplicated vertices on some triangles?
>
> 2) why the function 'SimplifySurfaceMeshCGAL' still can't remove the
> duplicated vertices (with edge length<  1.e-14) when the data is directly
> from boolean operations result?
>
> Thanks,
> Zhanghong Tang
>
>
>
>
> --
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