US EditionConverting between quaternions and rotation matrices
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Converting between quaternions and rotation matrices
In the previous post I wrote about representing rotations with quaternions. This representation has several advantages, such as making it clear how rotations compose. Rotations are often represented as matrices, and so it’s useful to be able to go between the two representations. A unit-length quaternion (q0, q1, q2, q3) represents a rotation by an angle θ around an axis in the direction of (q1, q2, q3) where cos(θ/2) = q0. The corresponding rot…
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