Nate''s site (nate.scuzzy.net) has a leafy BSP tree demo (w/source) which you can look at. He also has told me he is going to write a BSP tree tutorial. The BSP Tree FAQ (reality.sgi.com/bspfaq/) has some good info in it. Also, there is a tutorial at OpenGL Game Developer (shockonline.homestead.com/openglgameprogramming.html) too. If you find more tutorials, FAQs, etc. let me know.

Morgan

BTW, the BSP Tree FAQ has source and demo apps for many platforms.