This was helpful for me yonks ago when I read it. It might be worth a look. I might even read it again just to refresh.
Also, the Irrlicht 3D engine has the ability to read in BSP trees. So I would reccommend downloading it and checking that (I assume you're using C++?). Download the actual engine source, because theres a couple of different versions.
Irrlicht
Phreak




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