ふときっかけで物理エンジンのBox2Dについて少し調べたのでメモをば. Box2Dって何? http://www.box2d.org/manual.html Box2D is a 2D rigid body simulation library for games. Programmer's can use it in their games to make objects move in believable ways and make the world seem more interactive. From the game's point of view a physics engine is just a system for procedural animation. Rather than paying (or begging) an animator to move you