CGAL users discussion list

[Helmi Ben Hmida <>]

Hello again,
In cases, we have the differents 3D points composing the elements, if 
there is any way to create Nef_Polydehron with out going through the off 
file, it will be a solution also.

If any one has an idea how to do it, may be the problem will be resolved

Am 09.03.2012 12:05, schrieb Helmi Ben Hmida:
> In fact, we have created a Semantic 3D Spatial relation qualification 
> engine based on CGAL, it presents almost the research progress for the 
> last 3-4 mounth.
> Actually the purpose is to test our semantic engine with Building 
> elements to qualify semantic 3D Spatial relations between them.
>
> For this reason, we re trying to convert an IFC file to off files, 
> just for test.
> So, if any one has an ideas if there are existing off files for 
> Building elements, it will resolve the problem I guess !
> H.
>
> Am 09.03.2012 11:53, schrieb Nicholas Mario Wardhana:
> > On 9 March 2012 18:10, Helmi Ben Hmida
> > <>
> >   wrote:
> > > Hi,
> > > Yes, yes, it will be a closed  polyhedron for sure since also vrml 
> > > does not
> > > suport open geometries.
> > > I have tried Bertrand OFF file even u re update, always an empty 
> > > polyhedron
> > > !!!
> > Hmm, you are correct. I tested with my own code and it strangely
> > didn't load, for both "8 6 0" and "8 6 12"...
> > On the other hand, my own cube model (please see attachment; it has
> > triangular facets instead of rectangular) was loaded properly.
> > I'll get back to you when I find something.
> >
> > Best regards,
> > Nicholas