had a bit of a play around this evening and looked through a few BVH files - they all start the hierarchy with the Hip so I'm assuming that the coordinates/offsets of each body part are relative to the position of the top level Body object ? - not sure if it's possible, but if the hierarchy in the BVH included the Body object somehow so that it moves with the character I think that would sort it out (I tried changing the ROOT in the BVH to Body and although it was a bit odd because I lost the hip animation, it did move the body object with the character) - how to incorporate both the body and hip via a script or even manually I'm not sure, but I think that's what's making it difficult to append frames after a BVH animation unless they only move within a small area and stay around the zero position of the Body object btw, I may well be talking complete rubbish as I'm still new to this cheers Sean