On Sat, 2008-10-11 at 17:41 -0500, Jon Elson wrote: > There are a couple issues left. One is a wide disparity of frame > rates. When loading the A-10 aircraft, I get about 7 FPS over water, 5 > FPS looking at scenery in the default SFO area. I also get occasional > very jerky frame rates that look a lot worse than 5 FPS. But, with the > T38, I get 28 FPS most of the time, which is perfectly acceptable, and I > don't seem to notice those jerky moments, either. > > I am using the --disable-clouds command, and have renamed the > Textures.high directory to keep fgfs from using that (recommended by a > post on the group). I have a 64 MB Nvidia GeForce4 MX440. > So, any ideas why the A-10 has such terrible frame rates, and the T38 is > fine? Is it the instrument panel?
The A10 has huge texture requirements, and lots and lots of polygons... a 64 MB MX440 probably isn't enough card to run it well. > I switched to the 2D panel (which is pretty unusable) but it seems to > make no difference in frame rate. The 2D panel just overlays the 3D panel. The T-38, on the other hand is pretty light weight polygon model with few textures. By way of comparison, in my tree at least, the A-10 has 87 texture files and most seem to be 512x512. The T38 has 14 texture files with an average size of 256x256. A pretty significant difference. > All the above frame rates are in full-screen 1280 x 1024 mode. The > default frame size runs slightly faster, maybe 10-12 FPS with the A-10, > but still choppy. The chop is probably your card trying to deal with paging memory. > One other quirk I noticed is if I got to full screen during the splash > display, everything is OK. If I wait until the FGFS display has > started, it takes a LONG time for the full-screen display to rebuild, > and the frame rate is roughly 1-2 frames per MINUTE! Once FGFS has > started, any change to the screen display mode causes this extreme > slowdown. Anyone else ever seen this? > That's a new one on me... Good luck, Ron ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Flightgear-users mailing list Flightgear-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-users
