koobas.hobune.stream
Remainder of two rotations
I thought about this and the best way I could think of asking it is.
How do you find the remainder of two rotations?
In essence I am trying rotate an object back to zero without setting its rotation to zero.
Best Answer
Calculating the inverse of a Quaternion is done using, well, Quaternion.Inverse().
The result will return the rotation required to return from a rotation to Quaternion.identity.
By association, this also means that getting a rotation relative to another is done by multiplying the inverse of a rotation by a destination offset rotation:
// Create offset. This is the rotation to go from A to B.
Quaternion offsetAtoB = Quaternion.Inverse(A) * B;
// Use offset. From a new baseline, multiply by the offset.
Quaternion offsetRotation = transform.rotation * offsetAtoB;
