CGAL users discussion list

[skhiat <>]

Selon Andreas Fabri 
<>:

> 
>  wrote:
> > Hello I am a student at the university of Poitiers in Science and
> Mathematics
> > and plans to specialize in 3D visualization. Poitiers has a laboratory
> whose
> > work is quite interesting (http://www.sic.sp2mi.univ-poitiers.fr/). Under 
> > a
> > draft person I need to create a parser "3D L-System" with operations based
> on
> > 2D and 3D objects the aim is to come to something equivalent to 
> > http://blip
> > .tv/file/1473837 (city of engine) so CGAL choice seemed natural. But
> despite my
> > careful reading of the documentation that could not answer my questions.
> That
> > is why I ask :
> > * Is what makes CGAL operations such extrusions?
>
> Hi Soufiane,
>
> CGAL does not offer extrusion.
>
> > * Does CGAL allows for Polyhedrons and especially for Nef_Polyhedrons
> recover
> > vertex and triangle indices for is to make a exporteur in any format and
> can
> > display it in geomviewer other thing?
>
> Nef_polyhedrons can be converted to Polyhedron, unless they have lower
> dimensional faces, or edges with more than two adjacent faces.  For the
> latter
> we have output routines for the off format.
>
> > * Does CGAL can add vertex and triangle indices (model in a modeler any) 
> > in
> a
> > Polyhedron and especially a Nef_Polyhedrons to create it and apply Boolean
> > operators?
>
> Adding indices should be possible as you can provide your own vertex,
> halfedge
> and face class. However, you have to traverse the vertices yourself in order
> to affect integers 0,..,n-1
>
> A maybe simpler alternative is to use a std::map<Vertex_handle, unsigned 
> int>
>
> best regards,
>
> andreas
>
> >
> > Thank you in advance for your future answers.
> >
> > Sincerely KHIAT Soufiane
>
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Thank for you answers
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