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Binormals and tangents

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I am trying to do bump mapping. I have the normals of the geometry and i know that the binormal is the crossProduct of the nomral and the tangent. but how do i find the tangent. I mean i know that the tangent is in relation of the S and T of the texture but im just not understanding how this all comes together. I guess my question is how do i find the tangent in order to do bump mapping on a object more complex then a cube or a plan? thanks

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