1
Did you want this?
var localVelocity = transform.InverseTransformDirection(worldVelocity);
or
var localVelocity = Quaternion.Inverse(orientation) * worldVelocity;
This gives you a vector in the local coordinate frame of the transform/quaternion, where the z component is the forward velocity, the x component is the sideways velocity, and the y component is ...
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