Confuse about hkQuaternion and hkRotation
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Hey duotemplar,
To answer your questions:
Also, please note that there can be multiple values of an hkQuaternion that correlate to the same hkMatrix3... so there may be times when you start with one quaternion, convert it to a rotation matrix, perform operations on it such that it ends up in its original rotation, convert it back to a quaternion, and you get a different quaternion from which you began. So the best way to verify the 'equality' of two quaternions is by using them to rotate a vector and checking the basic equality of the resulting vectors.
Chris
Developer Support Engineer
Havok
www.havok.com