Hello Jean, Thanks so much for the tips. For reference I am working on a 64-bit Linux-86, with Nvidia Quadro 3450, and OSG 2.6.0. I don't think I am being affected by exuberant resolutions on shadow map, since I am using whatever is osg default (i'm not setting any resolutions, except the graphic contexts). I don't know if my driver is rolling back to software emulation, but I'll update my graphic card driver, to see if it helps. Anyways, I started looking into PSSM by looking at the OSG osgshadow example. The frame-rate gets worse using PSSM in that case. Are there any settings that I should set to improve performance when making use of PSSM? Thanks again!
-Jose On Thu, August 28, 2008 5:34 pm, Jean-Sébastien Guay wrote: > Hello Jose, > >> I have a HUGE terrain which uses paged LOD. > ... >> Using ShadowTexture technique drops my frame-rate from 60+ to >> low 30's to high teens. > ... >> Finally, using ShadowMap puts OSG on its knees at ~6 fps. > > You neglected to tell us what kind of hardware you're using, and what > version of OSG. > > I've only seen ShadowMap do so bad in two cases: > > 1. when the video card driver was falling back to software emulation for > FBOs (for the shadowmap render to texture) > > 2. when the shadow map texture resolution is higher than the video card > can support (most of the time, 4096x4096 or 8192x8192 is the limit on > recent video cards) > > Perhaps one of those could be your problem? > > If you have a large terrain, using ShadowMap with a very large texture > size is not a solution. Other shadow techniques are more adapted to > large scenes, such as PSSM or LiSPSM (the former is already in OSG, the > latter should be integrated soon). > > Hope this helps, > > J-S > -- > ______________________________________________________ > Jean-Sebastien Guay [EMAIL PROTECTED] > http://www.cm-labs.com/ > http://whitestar02.webhop.org/ > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
