CGAL users discussion list

["Tomislav Maric" <>]

@Sebastien

Thank you very much for your advice! I've seen the PolyhedronTraits_3 concept 
as well, and I was confused by the fact that it provides typedefs of the 
stuff one would expect to be defined in the Kernel. This is why I tried 
working with the Kernel, because the manual states that it defines the 
primitive types and operations on them... I will read a bit more about 
PolyhedronTraits_3.. I plan on using either Nef_3 or 3D triangulation later, 
hopefully they will swallow "point" and "vector". 

@All
Another question: why aren't the predicates/constructions satisfied by the 
type restrictions placed on Point_3 and/or Vector_3 provided by a concept of 
some kind (my guess would be the Kernel, since it defines both)? This would 
make it easy to use such types from other libraries... if they model Point_3 
and Vector_3 one to one... 


Thanks again, 
Tomislav

> ----- Original Message -----
> From: Sebastien Loriot (GeometryFactory)
> Sent: 03/26/12 10:24 PM
> To: 
> 
> Subject: Re: [cgal-discuss] Point_3 and Vector_3 from a different library
> 
> On 03/26/2012 09:31 PM, Tomislav Maric wrote:
> > Hi everyone,
> >
> > I went through the MyPoint2 and MyKernel files from the Kernel examples 
> > directory. Also, I've
> > spent some time reading on the Kernel concept. The thing is, I would like 
> > to use Polyhedron_3
> > with Point_3 and Vector_3 coming from another library (point and vector 
> > classes). Both of them
> > conform to the requirements prescribed by the Kernel::Point_3 and 
> > Kernel::Vector_3 concepts(trivial),
> > and they do not bring any new information (such as color from the above 
> > mentioned example of a 2D
> > point). Also, I expect them to behave exactly as Point_3 and Vector_3 
> > when it comes to geometrical
> > predicates and other function objects (after all, they are just a point 
> > and a vector).
> >
> >
> > Is it O.K. if I simply typedef the new point/vector type into 
> > Kernel::Point_3 and Kernel::Vector_3, after inheriting from a specific 
> > Kernel Class, within my Kernel?
> >
> > I have tried different things, but I would really appreciate some 
> > guidance on this, as I want to
> > do things right and there is a lot of information to process...
> >
> > Thanks,
> > Tomislav
> >
> If you provide a new model for the following concept
> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Polyhedron_ref/Concept_PolyhedronTraits_3.html
> as first template parameter of te Polyhedron_3 class that should work.
> 
> For predicates then this is another story. I think you need to follow
> the instructions.
> 
> Sebastien.
> 
> 
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