hehe! I'm curious about your solution too, because mine is not the nicest one and I don't think so it works with every 3D model, for example the ones which has the same orientation as vvvv. It was built for the models coming with the leap unity examples, and most of the headaches were coming from the orientation of the bones (right handed coords, Z upwards etc). but it also turned out that every bone needed different axis switching and different rotation order. nasty insane messed up shit, i have no idea how others implemented it elsewhere.