Laurence Vanek wrote: > Laurence Vanek wrote: >> Laurence Vanek wrote: >>> Curtis Olson wrote: >>>> On 6/4/07, *Laurence Vanek* wrote: >>>> >>>> Just reporting what the numbers say. My refresh rate is indeed set at >>>> 85 Hz. HUD reports the frame rates I gave above. >>>> >>>> The insane rates came after the discovery of the cmake -i approach >>>> when >>>> building OSG. >>>> >>>> One week ago I had these high frame rates but with no stick-slip. >>>> >>>> Im not complaining, just reporting what I see. builds I made one week >>>> ago did not display this behavior. >>>> >>>> >>>> I would suggest going into your video card settings and enabling >>>> "sync to vblank". That should cap your frame rates at your video >>>> display refresh rate (which is a good thing all around) and the >>>> problem should go away. >>>> >>>> Curt. >>>> -- >>> Curt - >>> >>> I have the following set using the NVIDIA X Server Settings tool: >>> >>> X Server Xvideo Settings: >>> >>> video Texture Adapter --> Sync To VBlank >>> >>> video Blitter Adapter --> Sync To VBlank >>> >>> OpenGL Settings: >>> >>> Sync To VBlank >>> >>> With those settings I still get the high frame rates (> 175 fps) & >>> stick-slip behavior. >>> >>> Interesting the situation is better with weather set to "none" >>> rather than METAR. Also observe that the worst stick-slip (maybe >>> stutter is better description) coincides with very high frame rates >>> (>200 fps). >>> >>> I was better off not building OSG optimized for this system. >>> >>> This is not my "first rodeo" with FG on this system. It would seem >>> something fundamental has changed with the code. Perhaps others can >>> confirm (or not) after building the latest sources. >>> >> Continuing my conversation with myself, would anyone care to weigh in >> on the speculation that the black dot patch for the rendering >> artifacts we had several weeks ago may have been the root cause of >> the issue described above? Im not a developer so I probably dont know >> WTF Im talking about but I thought I would raise the point. I did not >> have the stick-slip problem prior, using the same hardware. >> > Did find on Fedora 7 that AIGLX is enabled by default. I added the > following to my /etc/xorg.conf file to disable this stuff: > > ============ > Section "Extensions" > Option "Composite" "Disable" > EndSection > ============ > > This made a significant improvement in the "stick-slip" behavior. It > did not eliminate it so apparently more fooling around is required. > > There are quite a few posts on nvida's support forum with regard to > this issue. Appears to have multiple causes. > > > > > Just to wrap up this thread. I found that the recent suggestion by Martin Spott (on the devel list) of adding the following to the ~/.fgfsrc file:
--prop:/sim/frame-rate-throttle-hz=<Number> where <Number> is a number like 60 solved my problem (I used 85). As a point of reference, a non-open source flight simulator (not Microsoft) works perfectly on Fedora 7 without any rendering glitches & without the need to fiddle with X or the graphics card setup. This is definitely a FG issue. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Flightgear-users mailing list Flightgear-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-users
