Returns the conjugate of a quaternion.
Original signature is 'GLKQuaternion GLKQuaternionConjugate ( GLKQuaternion quaternion );'
Available in OS X x0.8 and later.
public static GLKQuaternion Conjugate (GLKQuaternion quaternion) { GLKQuaternion q = new GLKQuaternion (-quaternion.x, -quaternion.y, -quaternion.z, quaternion.w); return q; }