I gotta say that there have been many people putting a lot of effort in timing solutions ever since B3D. but I don't think anybody (at least on these forums) has put anywhere near the effort that Grey has for BMax. You can find his posts about this (and the people helping ) going back years. I myself have used Mark's B3D tweening code in B3D and a homemade method of tweening for max since it came out. but Max really does seem to make it harder (than B3D) to keep perfectly smooth code. But Grey's anti-jitter demos look real good for helping that....