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	Message: : The design I created for Unity in a way uses BSP. : The point in polyhedron test uses mathematical planes. : Polyhedrons are the polygons made 3D and planes are two sided infinite : spaces. : Make a BSP tree with those planes and you have a simple BSP that describes : the main polyhedron with adjacent polyhedrons. : I'm thinking there is a BSP tree for each polyhedron. : The convex polyhedron never clips itself and every plane is front facing on : the inside. : A concave shape could clip itself into convex spaces. : Could be two or more adjacent polyhedrons for one plane. : The player intersects the plane of the main polyhedron then the adjacent : polyhedrons check if intersecting. : When you have to check if the player is intersecting the adjacent polyhedrons : use the adjacent polyhedron planes and not the main polygon. : I've been researching how Unreal Tournament 99 works. : UT99 uses Constructive Solid Geometry to build a mesh then cuts it apart : using BSP. : I have the option to take the main polyhedron and the adjacent polyhedrons to : combine them into one mesh then use BSP to clip up the space using planes. : The way the Unity design is it does not know what polyhedron you are in after : leaving the main polyhedron until the adjacent polyhedrons check for the : player.
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