Ken Shirriff on Nostr: Hopefully this orange will clarify how the FDAI's mechanism works :-). Rotating my ...

Hopefully this orange will clarify how the FDAI's mechanism works :-). Rotating my hand would rotate the ball around the roll axis (red). The ball can pivot forward or back for the pitch axis (yellow). If you imagine a hollow hemisphere sitting on top, spinning the hemisphere is the yaw axis (green). 3/N