During my last year of university I started learning how to work with motion capture data and using MotionBuilder. I started by cleaning the animation : making it loopable, removing the keys where the feet were sliding... And finally animating the hands and modifying the rest. After that I used the story mode to make the walk longer for the renders. I really had a lot of fun learning how to do it and I wish to do more of these and improve my skills in cleaning up motion capture data and animating over it using animation layers.
