2011/12/15 Stuart Buchanan wrote: > I made the changes you suggested last night so that there is a single > geometry per cloud instead of one per sprite. That should have reduced > the number of draws by a factor of 10. > > The code isn't ready to be checked in (I've still got to sort the geometry), > but so far it hasn't made a significant difference to > the frame-rate on my system. However, I've got a fairly big graphics > card and get fairly high frame-rates, so it may help more for other people. > > It certainly doesn't make things any worse, and the code changes are > smaller than I had feared, so I expect to get this change checked in for > 2.6.0.
I've committed the code changes to my repository clones for the impostors, some configuration for LoD nodes, and having a geometry per cloud, with a bubble sort for ordering. It would be fantastic if people could take the time to cherry-pick these commits and see if it makes any performance difference for them. I anticipate the biggest difference being to 3D clouds generated by Global Weather, as those clouds tend to have more sprites than the Local Weather equivalents. The relevant commits are: https://gitorious.org/~stuartb/fg/stuartbs-simgear3/commit/f1df069643d711d3c0663997f385d4f2d034f71b https://gitorious.org/~stuartb/fg/stuartbs-flightgear/commit/24dd0ee0592aaf1fd33a37c058795a986de1406c https://gitorious.org/~stuartb/fg/stuartbs-fgdata/commit/7a6c1e6efdf33933b52995a1f0691f1fa4f210eb There are a couple of relevant controls: /sim/rendering/clouds3d-use-impostors - whether to use impostors or not. Defaults to true. If you change this you'll need to re-generate the 3D clouds by toggling /sim/rendering/clouds3d-enable. /sim/rendering/clouds3d-impostor-range - range at which impostors are used. /sim/rendering/clouds3d-lod1-range - size of the top level LoD node /sim/rendering/clouds3d-lod2-range - size of the second level LoD node. The latter 3 controls should take effect immediately, so you can see the impact of increasing/decreasing the point at which impostors are used. As I said previously, I'm not seeing massive changes in frame-rates with these changes. On my system, running the c172p from KLVK I get 30 fps with 2D clouds and 28-29fps with 3D clouds. However, the draw time presented by the on-screen OSG statistics appears to have dropped. Comments are welcome as always. -Stuart ------------------------------------------------------------------------------ Learn Windows Azure Live! Tuesday, Dec 13, 2011 Microsoft is holding a special Learn Windows Azure training event for developers. It will provide a great way to learn Windows Azure and what it provides. You can attend the event by watching it streamed LIVE online. Learn more at http://p.sf.net/sfu/ms-windowsazure _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
