math - Finding quaternion representing the rotation from one vector to another -

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I have two vectors v and v Is there a way to detect the representation of U to V to the quadrilateral? 

  quaternary q; Vector A = crossproduct (v1, v2); Q.xyz = a; Q.w = sqrt ((v1.Length ^ 2) * (v2.Length ^ 2)) + Doproteproduct (v1, v2);

Do not forget to generalize Q

Richard is right that there is not a unique rotation, but should give the "least arc" above perhaps what you want


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