" Ok, you can do here much for the collision detection. I expect that you should optimize that algorithmically and gain magnitudes without sse. "
You are probably right, but Rick is the OSG guru in the team, and I do not understand osg that well yet as most of my time has been spent developing other aspects of the game. My strength lies with general purpose optimizing code, and so this helps our game tremendously. The least I can do is contribute this to the community and hope others get a boost as well. " So the question is more if such optimizations will bring performance improvements for the usual scenegraph case. " When I get home tonight I'll disable the collision detection and run the profiler again, and post the results, hopefully that data should answer this question. ----- Original Message ----- From: "Mathias Fröhlich" <[EMAIL PROTECTED]> To: "OpenSceneGraph Users" <osg-users@lists.openscenegraph.org> Sent: Tuesday, July 29, 2008 10:14 AM Subject: Re: [osg-users] Using SSE within OSG James, On Tuesday 29 July 2008 16:59, James Killian wrote: > Paul asked me the same question a few days ago, and I just realized that we > took that offline so I'll repost here: > One of the things I should add is the actual profile dump, since that shows > a more comprehensive picture. The actual game demo is free to download and > play here: > http://www.fringe-online.com/ > > The current installer of the game does not have my optimization in it yet, > but it should be noted even with the optimization the postmult is still at > the top. The Invert4x4() however got pushed way down to the bottom (which > is great). I'll post my profiles when I get home. > > > ---------------------------------snip------------------------------------- - >- --- > That is a good question, and I believe the answer is collision detection. > I should disable it and run the numbers again to confirm. All ships fire > machine guns at a fast rate, and each bullet that gets close enough to a > bounding box/sphere region has to go through the osg code to get the > precise point where it hit. Rick would probably have a better explanation > of this and other factors since he coded the bulk of the collision > detection (and osg integration). Most of my time development in the game > has been spent on the physics and flight dynamics (and now optimization). > > It may turn out that we could find some caching technique to reduce the > collision stress (like the KBDtree), but in the mean time, matrix > optimizations can benefit the whole community if we do them right, and I > would like to make some contribution to the community. Ok, you can do here much for the collision detection. I expect that you should optimize that algorithmically and gain magnitudes without sse. So the question is more if such optimizations will bring performance improovements for the usual scenegraph case. Greetings Mathias -- Dr. Mathias Fröhlich, science + computing ag, Software Solutions Hagellocher Weg 71-75, D-72070 Tuebingen, Germany Phone: +49 7071 9457-268, Fax: +49 7071 9457-511 -- Vorstand/Board of Management: Dr. Bernd Finkbeiner, Dr. Florian Geyer, Dr. Roland Niemeier, Dr. Arno Steitz, Dr. Ingrid Zech Vorsitzender des Aufsichtsrats/ Chairman of the Supervisory Board: Prof. Dr. Hanns Ruder Sitz/Registered Office: Tuebingen Registergericht/Registration Court: Stuttgart Registernummer/Commercial Register No.: HRB 382196 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
