What is BSP and what can it be used for?
BSP
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"Binary Space Partitioning Trees" is a name for a fileformat invented by ID Software that came with the Quake FPS series. It includes several Layers of information about a level map. Most important is probably the VIS Data, this is precalculated information about what parts are visible from where, so the game engine can hide (and skip rendering ) dynamicly those parts that cannot be seen anyway. Basicly this will allow to use large levels and keep the framerate high, even on very crappy machines.