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Calculating texture coords

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I'm (still working on the damn thing after around 7 months) making a map compiler, and I dont know how to calculate texture coords. I've got access to all the usual data needed, such a vertices in a poly, the texture width/height, scaling info for width/height. I have no idea what the formula is to calculate the uv coords, and google doesnt turn up anything useful for this. Thank you for your time.

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Here is an articel about spherical mapping:
http://www.mvps.org/directx/articles/spheremap.htm
there are other methos too, like planar mapping and cylindrical mapping.

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