CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

The nef facets are triangulated using a projection of the vertices 
inside the XY, YZ or ZX plane followed by a call to Delaunay
on the projected plane.

One thing to try is to hack the class Build_polyhedron
define in Nef_polyhedron_3.h:762 and remove the if part
line 793 to keep only the else. That way your polyhedron
faces won't be triangulated.

Then you can call triangulate_faces [1]

If this gives good results, we will thing about doing this by
default.

Sebastien.

[1] 
http://doc.cgal.org/latest/Polygon_mesh_processing/group__PkgPolygonMeshProcessing.html#ga78da163452ce0675288191bcab1dedc8

On 11/18/2015 11:08 AM, Gilles wrote:
> Hello,
>
> May be a newbie question !
>
> To be able to achieve boolean operations, I have to transform *Polyhedron
> into Nef Polyhedron* and from Nef Polyhedron once the boolean operation is
> done.
>
> The problem :
>
> The way the transformation triangulate makes *faulty normals *(please look
> at the image).
>
> Is there a way to triangulate "properly" the polyhedron to avoid this
> problem.
>
> Thank you in advance
> Best Regards.
>
> Gilles
>
>
> <http://cgal-discuss.949826.n4.nabble.com/file/n4661349/normals.png>
>
>
>
>
> --
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