[Opensim-dev] Usage of trimeshes, was: Open Mantis issue, already incorporated

[dan miller]

[dan re: trimeshing]
> >> There's code for this in the client, but of course that's GPL and
> cannot be
> 
> I looked into the viewer code and can't find it there.
> Maybe someone with can hint me to that. Personally I believe that they use
> OpenGL for that, so we can't access that for physics usage.

Well I don't know if OpenGL does it directly; it has GLE, an add-on which
does some of that sort of thing.  I believe GLE is GPL, so again it would be
out.

> In the meantime I gave that a lot thinking and came to the conclusion,
> that the trimeshing itself is only a small part of the problem.
> It seems more to boil down to geometric operations between polygons:
> Start with the simple surface, subtracts cuts from it, subtract hollows
> from that and finally make a transformation that takes tapering and all
> other deformations into account.

I think you're right.  I use the term 'trimeshing' to mean the whole thing;
the geom ops plus delaunay or whatever triangulation algorithm is used.
> 
> Currently I'm looking for a good geometry library to use for that; my prim
> candidate is a lib named CGAL.

That looks great from the top page; the only worry is this "Q" license, I've
never heard of that.  We have other LGPL stuff in already I believe.

-danx0r
> 
> Any opinions, comments on that?
> 
> best regards
> Gerhard
> 
> -----Ursprüngliche Nachricht-----
> Von: opensim-dev-bounces at lists.berlios.de im Auftrag von dan miller
> Gesendet: Do 10/4/2007 9:33
> An: opensim-dev at lists.berlios.de
> Betreff: Re: [Opensim-dev] Open Mantis issue, already incorporated
>  
> > It would be nice if someone with "powers" would care for that...
> > ... making room for new issues :-)
> 
> done.  I was looking at what it will take to mesh all the remaining prim
> types.  It looks like quite a job.
> 
> There's code for this in the client, but of course that's GPL and cannot
> be
> used.  I'm wondering if someone somewhere has done work to visualize the
> prims outside of the LL codebase?  Or perhaps there exists some library
> with
> an appropriate license that does something similar?  A visual mesh that
> keeps the tri count low can be converted into a trimesh for collision in
> ODE
> without too much trouble.
> 
> Otherwise I expect this to be a long and laborious process.
> 
> -danx0r
> 
> _______________________________________________
> Opensim-dev mailing list
> Opensim-dev at lists.berlios.de
> https://lists.berlios.de/mailman/listinfo/opensim-dev
> 
> > _______________________________________________
> Opensim-dev mailing list
> Opensim-dev at lists.berlios.de
> https://lists.berlios.de/mailman/listinfo/opensim-dev
>