>When doing stereo with two 280's use two viewer Camera's to make the >most of multi-threading performance that the OSG has to offer. Could you please explain it? But if I have 2 views I have to share scenegraph between windows. So OSG simply duplicate geometries? Or maybe I don't understand something? Roman
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Robert Osfield Sent: Thursday, December 11, 2008 1:33 PM To: OpenSceneGraph Users Subject: Re: [osg-users] RTT and stereo (corrected) Hi Roman, The performance you are getting it not to surprising. Your GPU costs are obviously the biggest bottleneck. Moving to a single GTX280 will radically improve this, there is little reason why you shouldn't be able to do 60Hz in stereo. Using two GTX280 would give you an even wider margin for hitting a solid 60Hz. Once you move to the 280's you probably find that the GPU is no longer the bottleneck and your cull could well be the longest element, but if you're hitting a solid 60Hz in stereo already no need to worry. When doing stereo with two 280's use two viewer Camera's to make the most of multi-threading performance that the OSG has to offer. Robert. On Thu, Dec 11, 2008 at 9:41 AM, Roman Grigoriev <[EMAIL PROTECTED]> wrote: > Thanx Robert for your reply. > With single view I have 50 fps with stereo I have 25 fps. It is very > predictable result. > Event 0.05 > Update 1.36 (two Intersense InertiaCube3 sensors) > Cull 5.2 (clouds) > Draw 2.16 (ephemeris,clouds) > GPU 27.2 > I simply try to improve it. > I have single 8600GT. But for stereo config I will use double GTX280. Hopes > that It will change situation. > Bye > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Robert > Osfield > Sent: Thursday, December 11, 2008 12:20 PM > To: OpenSceneGraph Users > Subject: Re: [osg-users] RTT and stereo (corrected) > > Hi Roman, > > On Thu, Dec 11, 2008 at 6:57 AM, Roman Grigoriev <[EMAIL PROTECTED]> > wrote: >> So for now I solve problem by doing all postprocess operations for left > and >> right eye and have huge frame drop to 25 fps L > > Stereo rendering normally incurrs a performacne hit, as you are > doubling the amount of work done. Is ther performance > disproportional? > >> Could someone please give me recommendations what is better render to one >> big texture both left and right eye (1600*600) or render to two small >> textures (800*600)? > > Design wise it would be much easier to have one texture pure eye. > Performance wise it probably won't make too much difference as the > bottlenecks aren't likely to be related to setup of FBO's/teuxtures. > You "might" see a performance improvement with using a single texture, > but I doubt it would be worthwhile. > > I'd recommend looking at your wider performance bottlenecks. What is > your cull/draw costs? Due you have two graphics cards and a multi-core > GPU available? > > Robert. > _______________________________________________ > 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 > _______________________________________________ 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
