I haven't applied the patch yet, so I can't give full specs. With CVS as of a few days ago, I did notice that OSG attributed almost double the 'update' time with 3D clouds on.
I assume that Tim can comment on what The 'update' time is. I assume this means that (at least prior to your patch) the 3D clouds is current CPU limited. I can't comment on the 'draw' time difference, although it does appear that there are now extra 'cameras' in the last few weeks. On my multi-GPU system I used to have num-displays+1, now I seem to have num-displays*2. Is this expected? For multi-display, this would have an impac on framerate (particular with the serialized mode that is default. I'll discuss more fully in a different email - I just wanted to touch this here in case it is clouds related. Regards... Matthew On 11/26/08, Markus Zojer <[EMAIL PROTECTED]> wrote: > Well, just tested, very nice, I withnessed an improvement in performance. > > My specs: Athlon XP2000, 768MB ram, NVidia FX 5900 @ 1680x1050 (system: > linux with nvidia drivers), no AA > > Using: sg + fg cvs, OSG 2.7.5; everything enabled, custom settings, > using metar, no ai/mp planes around > > > Startup: 30fps 2D/ 20fps 3D (clouds at 6000ft, scattered, thickness 600ft) > > Flying 400ft/440knots: 26fps 2D/ 19fps 3D (clouds at 6000ft, scattered, > thickness 600ft) > > Flying 6300ft/440knots: 35fps 2d/ 11-22fps (clouds at 6000ft, scattered, > thickness 600ft) > Note: Flying within the clouds resulted in 22fps, getting very close or > through clouds 11fps > > > Changing conditions: > > Low vis (7000m), clouds at 8000ft(broken) and 4000ft(broken), thickness > 600ft > > Flying @ 8000ft/440knots: 14fps 2D/ 6fps 3D > > >Low vis being also a frame rate killer? > > > Changing conditions: > > Vis (25000m), clouds at 5500ft(broken), thickness 600ft > > Flying @ 8000ft/440knots: 25fps 2D/ 16fps 3D > > Flying @ 6000ft/440knots: 20fps 2D/ 12fps 3D > > Hope this helps a bit, > Markus > > > Stuart Buchanan wrote: >> Stuart Buchanan wrote: >> >>> Vivian Meazza wrote: >>> >>> >>>> And I have yet to see any 3d clouds. Any clues on where I should be >>>> looking >>>> (yes the box is checked :-)) >>>> >>> Something has changed in the environment manager which means that clouds >>> generateion is now inconsistent. I'm still tracking it down, as my recent >>> >>> changes shouldn't have affected this. >>> >> >> Well, the cause was a bug in my code, but it didn't expose itself until we >> moved >> to multiple cameras. The attached patch fixes the problem. >> >> I've also put in a new heuristic to improve the frame-rate. Clouds that >> are already sorted >> are likely to still be sorted in subsequent frames. Therefore I've put in >> a back-off >> mechanism for the bubble-sort pass. This should mean that if you stay >> completely >> stationary, once the clouds become sorted they will eventually only >> perform a >> bubble sort pass every 128 frames. >> >> It would be good to get a feel for how bad performance is with 3D clouds. >> At the moment >> I don't have a handle on whether performance is almost good enough, or >> completely >> unacceptable. I'd appreciate it if people would post their observations, >> providing >> details of their machine spec, graphics options and the frame-rate with >> and >> without 3D clouds - ideally with a description of the general load on the >> machine. >> >> Thanks, >> >> -Stuart >> >> >> >> ------------------------------------------------------------------------ >> >> ------------------------------------------------------------------------- >> 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-devel mailing list >> Flightgear-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/flightgear-devel >> > > > ------------------------------------------------------------------------- > 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-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel > -- Sent from my mobile device ------------------------------------------------------------------------- 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-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
