Hello J-S, > > > > > I have a nvidia g80 to use with geometry shaders but I don't know much about > > how to use them. If anyone have a knowledge on this topic we can collaborate > > on an osg implementation. It can be an interesting topic to work on. > > As Glenn mentioned, a general interface with multiple rendering > backends would be the best implementation. Making one backend first > though is OK, as long as the interface is general enough. > > You might want to wait for Mike's integration of geometry shaders into > the OSG so that the geometry shader side is more generalized.
Yes I guess it will be very useful if we have a more general implementation for geometry shaders. Are we able to use cg shaders on osg ? I don't know of an example about geometry shaders in glsl. If there is one pls let me know. > > I think the GLU implementation would be less work, as GLU essentially > does all the work for you - you just give it the parameters of your > curves/surfaces and it does the rest. I can supply a simple, > straight-OpenGL/GLU/GLUT example if you want. Of course! It will be perfect to have some examples on glu. > > For geometry shaders you would have to implement the tessellation > yourself, I guess. The main advantage would be speed, I would imagine, > though some actual benchmarking would be nice. I have no experience > with geometry shaders either, so I can't vouch for how easy/fast such > an implementation would be. I implemented some algorithms on my G80, like convolution filter, they work pretty fast compared to cpu based implementations(10-20x). Since we will be free of vertex transfer overhead from cpu to gpu when using geometry shaders, gpu based tesselation would run, as I guess, times and times faster than cpu based tesselation. (when thinking of at average ~70 stream processors working on tesselation in parallel [for my case: 8800gts has 96 stream processors total ]) This topic can become an interesting thing to work on, anyone having any news on this topic pls keep us posted. /emre _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
