I want to add something for u guys to look at 1) Make a complete symmetry model export it into object with a file name. 2) Import symmetry model, make some detail work on it, export it into obj again with new file name. 3) Import the obj back in and make animation with it. Do you have any idea how much time it would take for those process on every model? Do you know how long it would take if a obj file have more than a million polygons? OUCH!