Hi Rene, The effect of enabling FSAA suggests that the performance difference is largely down to the fill limit of the graphics driver/card and unlikely to be related to the OSG.
Robert. On 8/28/07, megamiller zoid <[EMAIL PROTECTED]> wrote: > > Hi Robert, > > Thank you for the response, I will check some older versions of the OSG and > do the > walking forward in time. I tried some nvidia-settings, and different > machines. > > The previously posted framerates were with "__GL_FSAA_MODE 4", > "setenv __GL_FSAA_MODE 0" (anti-alising off) > > made a huge impact (on Quadro FX 3400, the resolution 1400x1050): > > "osgviewer cow.osg --stereo OFF" = 1000 fps > Frame duration 0.000999 > Frame rate 1001 > "osgviewer cow.osg --stereo ANAGLYPHIC" = 603 fps > > "osgviewer cow.osg --stereo QUADBUFFER" = 433 fps > > I tested it also on a Quadro FX 1300 (1280x1024), with similar results, > > with anti-aliasing 4x bi-linear : > > mono = 260fps > anaglypic = 155 fps > quad_buffer = 36 fps > > with anti-aliasing off : > > mono = 400 fps > anaglyphic = 260 fps > quad_buffer = 187 fps > > This is all done under Ubuntu (Edgy Eft). > > (p.s. Shift-S only works after pressing s, else you will get an empty stats > report) > > I never noticed those slow framerates with quad_buffer stereo before, > if I find an older version of the OSG that has (much) better performance > with > the same hardware (and settings), I will let you know. > Thanks again, > > René > > > > >Hi René, > > > >One would expect performance to drop when you enable stereo. The > >performance drop for QUAD_BUFFER I would normally expect to be similar > >to ANAGLYPHIC or the other stereo modes - a factor of two would > >normally be what you'd expect. > > > >A drop of 6 times is exceptional, alas I don't have a quad buffer > >capable system here so can't test personally. There have been no > >changes to the OSG that I would expect would cause problems like this. > > A 6 times drop rather a 2 times drop suggest it isn't just the fact > >the the scene is being culled and drawn twice, but rather memory issue > >on the card with the bigger frame buffer, and issue with the pixel > >format support on the driver/hardware. > > > >One cannot rule out a problem at the OSG end, but there haven't been > >any changes I can think of that might have introduced such an issue. > >If you do think older versions of the OSG were OK then I'd suggest > >reverting back to an older version and seeing if things suddenly > >performance as expected - if this happens then walking forward in time > >in versions till the problem appears will give us a point in time that > >things broke, and a much better ideal of what it might be. > > > >Robert. > > > >On 8/28/07, megamiller zoid <megamillerzoid at hotmail.com> wrote: > > >> Hello, > >> > >> I noticed that when I turn on quad_buffer stereo, applications become 6 > >> times slower. > >> For example when I run "osgviewer cow.osg --stereo OFF" the framerate is > >> 283. But > >> with "osgviewer cow.osg --stereo QUAD_BUFFER" it drops to 42. > >> (while ANAGLYPHIC stereo runs with 175.) > >> > >> I think this has happened recently, currently I'am running the svn > checkout > >> of 2.1.8. > >> Since I could not find any recent post about this, I thought I would > post. > >> Has anyone > >> else experienced this performance hit? > >> > >> Have a nice day! > >> > >> René Molenaar, > >> Delft, The Netherlands > > > > > ________________________________ > Jouw nieuws: wereldnieuws! Beleef 't op MSN.nl > _______________________________________________ > 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
