http://www.opengl.org/
I just noticed that Humus is making headlines with his demos. Well done Humus.
Demo on portal rendering using occlusion queries and using the OpenGL Shading Language for lighting
12/20/03 This demo uses occlusion queries with portals to cull invisible parts of the scene, and uses the OpenGL Shading Language (OGLSL) for the lighting computations.
I just noticed that Humus is making headlines with his demos. Well done Humus.