Jari > I cannot use material shaders on my iMac (late 2009 model) equipped with > an ATI graphics card (ATI Radeon HD 4670 256 MB VRAM). I only get a few > fps standing on ground at an isolated airfield. There is almost no > objects. Every 10 times I get 60 fps in cockpit view with no changes > except restarting flightgear. Toggling through different view gives > different frame rates where the tower views always gives around 60 fps > and the others give 2-5 fps (except the occasional 60 fps I get in the > cockpit view). > > In cases when I get 60 fps in cockpit view my computer maintains 60 fps > with 3D clouds and skydome scattering turned on. The frame rate is > stable even flying through the magnificently rendered clouds. > > If I turn of material shaders I always get 60 fps in all different > views. (Is 60 fps a maximum reading, I never seem to get higher readings?) > > On my Macbook Pro (early 2008) model, I always get 60 fps staying away > from the 3D clouds but the frame rate drops to 20 fps when I fly through > clouds. The MBP has a GeForce 8600M GT 256 MB VRAM. > > The test on my iMac was done on yesterdays source from the various > repositories and everything is compiled with -g -O3 (-O2 gives the same > numbers). I have also tested a couple of Tat's git snapshots from the > macflightgear site and they give similar negative shader effect. > > I read through many posts on flightgear and shaders on the web but > nothing has resolved my issue. Is the above a flightgear issues or is it > my hardware? I haven't noticed anything strange with my iMac and Apples > extended hardware test does not report anything. >
The most _likely_ cause is the ATI Radeon HD 4670/256 MB VRAM. The GeForce 8600M GT is known to be better at handling shaders. 256 Mb VRAM is in both cases a bit small for FG nowadays. There are other possible contributors to a low framerate - AI traffic is one. 60 fps could be a maximum if you are using this option - --prop:/sim/frame-rate-throttle-hz=60 It might well be on by default. Vivian ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense.. http://p.sf.net/sfu/splunk-d2d-c1 _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
