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Texture Coordinate Generation..

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I am writing an OpenGL engine, and I want it to use calculated texture coordinates, rather than stored ones, like Quake. Quake doesn''t store the texture coordinates in the map file, it just stores scaling and offset info. I have been trying to figure out how to slap a texture on a triangle without deforming the texture at all. The triangle isn''t always facing along one axis so I can''t use it''s vertices as texture coordinates. Worldcraft (Quake/HL level editor) does it, you make a brush and all sides are texturemapped without deformation, etc.. Can someone please point me in the correct direction or explain it to me? Thx in advance

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