Convert right hand coordinate to left hand coordinate

right-hand-to-left-hand

 Solution 1:
 This is from website, however I don't think it's ritht.
static function MayaRotationToUnity(rotation : Vector3) : Quaternion {
   var flippedRotation : Vector3 = Vector3(rotation.x, -rotation.y, -rotation.z); // flip Y and Z axis for right->left handed conversion
   // convert XYZ to ZYX
   var qx : Quaternion = Quaternion.AngleAxis(flippedRotation.x, Vector3.right);
   var qy : Quaternion = Quaternion.AngleAxis(flippedRotation.y, Vector3.up);
   var qz : Quaternion = Quaternion.AngleAxis(flippedRotation.z, Vector3.forward);
   var qq : Quaternion = qz * qy * qx ; // this is the order
   return qq;
}

Solution 2:
Right hand (IMU): 
 Quaternion(q0,q1,q2,q3)

Right => Left(unity)
 Quaternion(q1, -q3, q2, q0)