CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Mohamed Yousef wrote:
> 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
In which context? the kernel is still available using 
Polyhedron::Traits::Kernel.


Please provide a minimal example that highlighting your problem. If We
cannot reproduce a bug it is hard to correct.


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