To gain fps

[abs1nth]

There's currently no occlusion culling. I'd like to add it, though. The method I want to do is based on the opengl hardware occlusion queries (ARB_occlusion_query). There is a good article in GPU Gems 2 about how to use it effectively.

i bet you are referring to "Hardware Occlusion Queries Made Useful". i even know the people who developed this method as they are on my university. the benefit here is that there are already at least 3 implementations out there, e.g. in Ogre3D. the original paper is here and quite readable:
http://www.cg.tuwien.ac.at/research/vr/chcull/

supposedly there is a newer method that works even better (also based on occlusion queries), the paper is here:
http://www.cg.cs.uni-bonn.de/docs/public...ptimal.pdf

btw i've written a small report about data structures and occlusion culling a few weeks ago ;-)
http://www.cg.tuwien.ac.at/courses/Semin...bility.pdf