Hi David, really impressive project! I’m trying to do something very similar, but without the Vive Trackers. The only information that I’m being given is the Vector3's containing x,y,z positional information for every joint of my character. This info is being updated per frame. Since I don’t have the rotational information of these points, do you have any insight or recommendations on how to accomplish this? I am also not using any Vive controllers, so the only rotation info has to come from the headset itself. Any help would be greatly appreciated! Cheers.