Curtis L. Olson wrote: > I'm not claiming we are currently optimal, but you also need to > consider that by grouping your low level structures into larger > chunks, you reduce the ability of the scene graph to do an early cull > of non-visible stuff. Making larger chunks needs to be balanced > against the benefits of scene graph culling that smaller chunks bring.
The majority (I'm guessing 70%) of tiles are either rendered in their entirety or culled in their entirety. The tile would seem, to me, to be just about the right granularity for doing culling. Certainly culling on tiny 10 vertex objects is too fine-grained, no? You can DMA a *lot* of vertices across the AGP bus in the time that it takes to do that cull. If my 70% guess is correct, then doing culling at a tile level will send 15% (the remaining 30% of tiles are on average half-invisible) too many vertices to the card for each frame. Rendering out of large vertex arrays instead of doing glVertex() calls has to be worth at *least* 15%. Andy -- Andrew J. Ross NextBus Information Systems Senior Software Engineer Emeryville, CA [EMAIL PROTECTED] http://www.nextbus.com "Men go crazy in conflagrations. They only get better one by one." - Sting (misquoted) _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
