Hi Robert,Thank you for the response, I will check some older versions of the
OSG and do thewalking 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 fpsI tested
it also on a Quadro FX 1300 (1280x1024), with similar results, with
anti-aliasing 4x bi-linear :mono = 260fpsanaglypic = 155 fpsquad_buffer = 36
fpswith anti-aliasing off :mono = 400 fpsanaglyphic = 260 fpsquad_buffer = 187
fpsThis 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 withthe 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
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