//Formula for angle θ between two quaternion is:
//θ = cos^−1 (2⟨q1,q2⟩^2 − 1), Where (q1,q2) is inner product of the quaternions.
float X = from.mVector.Dot4(to.mVector);
//Formula for angle θ between two quaternion is:
//θ = cos^−1 (2⟨q1,q2⟩^2 − 1), Where (q1,q2) is inner product of the quaternions.
float X = from.mVector.Dot4(to.mVector);