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 <[EMAIL PROTECTED]> 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
