I'm working on a game with one other guy. I'm the artist and he's the programmer. I just started animating our 2d characters in after effects for some sick smooth animations. However, we've been simply using a sprite sheet to read the animations into the program up until this point. Now that our animations are 30 frames per second, this doesn't seem practical anymore. What is a conventional method for implementing ultra smooth graphics in a game programmed in something like java or c++? (example: the character animation in castle crashers).