Hi Michael, Yes, sorry about OpenGL interpretation of polygons, I forgot that.
Well actually, I guess the reader has to handle most (all?) cases. So I suggest to have something like: - If number of points <= 4, use current code. - Else call GLU tesselation. Do you agree? The problem I have is that osgUtil::Tessellator is intended to operate on osg's structures. Any idea on how to make it work easily in the reader plugin? Sukender PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/ ----- "Michael Platings" <mplati...@gmail.com> a écrit : > No, 1 to 1 mapping of primitives isn't possible because OpenGL doesn't > render concave polygons correctly (in practice GL_POLYGON is the same > as GL_TRIANGLE_FAN). > Tesselation is possible via GLU but very slow so we need to be careful > about how we use that. Most models I've come across have many > triangles and quads but few polygons >=5 vertices. If we apply > triangulation to those few polygons then most models will be > unaffected. For quads I imagine it would be possible to write some > fast specialised code to see if they should be split across vertices > (0,2) or (1,3) so that loading times remain bearable. > However, if your content provider could just produce models that are > already suitable for real-time rendering that would be best ;) > > > On 5 July 2010 09:09, Sukender < suky0...@free.fr > wrote: > > > Hi all, > > The FBX reader seems to interpret FBX polygons as triangles. Well I > guess this should not be, as 1-to-1 mapping of primitives is possible > (as far as I know), but this is not really an issue. What is an issue > is that concave polygons are not intepreted the right way. I think > about two solutions: > 1. Use tessellation code to get correct "splitting" > 2. Do the 1-to-1 mapping of primitives > > Am I right ? > Other ideas? > Anyone having time for this? > > Thanks folks! > > Cheers, > > Sukender > PVLE - Lightweight cross-platform game engine - > http://pvle.sourceforge.net/ > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
