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Need helping finding an angle

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Another person on the OpenGL forum told me that to find an angle between two vectors I can use: angle = arcos( v1•v2 / |v1||v2| ) where • is the product | | is the magnituted. The only thing is that I don't know how to get the prodcut. What I am trying to accomplish is to rotate an object so it is looking where it is going. Thanks Jake

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