Hi Robert, Its a long while since I worked with light points so off hand I can't say what might be causing the periodically high cull load, you'll need to dig into the relevant code and add timing to see what part is taking the time. With your scene graph it is probably best to write it out to .osg after you've done the optimization passes on it to see what the resulting scene graph is structured like. Lots of separate transforms is very in-efficient and since the osgUtil::Optimizer doesn't know about light points (osgParticle is a high level library than osgUtil) then there is no way for it to flatten them so it disables the flatten for any objects called LightPoint.
Robert. On Jan 17, 2008 11:47 AM, Robert Balfour <[EMAIL PROTECTED]> wrote: > I have a model of hundreds of lightpoints on the ground, each lightpoint > with an associated small light model (taxiway lights at an airport). > > Looking at this .osg model in osgviewer, the CULL time has a 2Hz pulse, > where it jumps from approx 6ms up to 12ms about twice a second. > Sometimes it will even get "stuck" up at 12+ms for a few seconds before > dropping back down to a 2Hz pulse. > > What could potentially cause this pulsating cull time? I have other > sets of lightpoints/model (runway lights) that don't exhibit any > pulsating. > > Also, even a 6ms cull time seems a bit expensive (the draw time is a > reasonable <1ms). Each of the hundreds of lightpoints and models were > positioned with a STATIC matrix transform (which would be flattened and > optimized out on load?), with a top DYNAMIC matrix transform over the > whole group (to position it in real-world airport coordinates). Can this > be re-organized to reduce the cull time? > > Thanks. > > > Bob. > -- > Robert E. Balfour, Ph.D. > Exec. V.P. & CTO, BALFOUR Technologies LLC > 960 South Broadway, Suite 108, Hicksville NY 11801 > Phone: (516)513-0030 Fax: (516)513-0027 email: [EMAIL PROTECTED] > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
