Hey, Once again, I got a question about quaternions. Say I have an initial rotation Q1. I now want to rotate Q1 on the X and then on the Y axis. BUT: The Y rotation should apply to the local Y axis which was given in Q1. The problem is: If i rotate Q1 by the X-rotation Q2, then the Y axis changes for Q1*Q2. So, since quaternion multiplication is noncommutativ, if I then apply the Y-rotation Q3, I don't rotate about the original Y axis of Q1. How can I rotate quaternions this way? Greetings!