The Napolean Group, around since 1985, must be doing something right: earlier this year the previz/postproduction studio moved into two new floors of the old Kate Spade offices in the Flatiron district. One new feature–a new mo cap system–hits the spot for anyone using previz. Napolean now uses a 12 camera Vicon Bonita system which makes mo cap fast to setup and easy-to-use, unlike earlier systems…