I have two objects A and B, with a start transformation matrices MA1 and MB1 (they include translation, rotation and scale). End matrix of the first object is MA2. How do I apply the same rotation as a rotation of object A from MA1 to MA2 ( difference) to object B and get MB2?
2026-03-26 02:33:33.1774492413
Difference in rotation matrix
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First you extract rotation matrix from transformation matrix. You take top-left 3×3 submatrix $T$ and use polar decomposition to find rotation matrix $U$. If you know that scale is the same on all axes, then you can just divide $T$ by cubic root of determinant: $U=T/\sqrt[3]{\det T}$.
Finally, $U_{1\to2} = U_{A2} U_{A1}^{-1}$