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[Mohamed Yousef <>]

suppose we want to define a Polyhedron that has the plane support , depending on Polyhedron_traits_with_

normals_3 as traits , we would do

typedef CGAL::Exact_predicates_inexact_constructions_kernel  Kernel;
typedef CGAL::Polyhedron_traits_with_normals_3<Kernel>        Traits;
typedef CGAL::Polyhedron_3<Traits>                                       Polyhedron;

and then use Polyhedron normally , the problem is our Polyhedron now lacks many things already been in Kernel (in fact everything but Point_3 and Plane_3 ) this hindered me and i found the solution used elsewhere in cgal is to inherit the specilizing kernel , thus you are adding to it

On 8 July 2010 10:08, Sebastien Loriot (GeometryFactory) <sloriot.ml@gmail.com> wrote:

Sorry but I still don't get your point.

The activation of the plane support is done within a class model of PolyhedronItems_3.

http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Polyhedron_ref/Concept_PolyhedronItems_3.html#Cross_link_anchor_1096

Can you please state clearly what you would like to do.

S.


Mohamed Yousef wrote:

simply if you want to use it as usual to extend a kernel by adding plane support , you will lack all additional things the kernel provides

the way for this to go (done in other traits , every where in cgal ) is to inherit from specializing kernel , thus you have your kernel with additional support of plane

Regards,
Mohamed Yousef

On 8 July 2010 08:52, Sebastien Loriot (GeometryFactory) <sloriot.ml <http://sloriot.ml>@gmail.com <http://gmail.com>> wrote:

   Mohamed Yousef wrote:

       Hello,

       i think the class "Polyhedron_traits_with_normals_3" should
       inherit from Kernel_

       Thanks,


   Reading the documentation I see no reason why it should.
   The concept PolyhedronTraits_3 is quite simple and
   Polyhedron_traits_with_normals_3 seems to be a model of it.

   What leads you to think there is a bug?

   S.

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