ABSTRACT
The main goal of computer animation is to synthesize the desired motion effect, a mix of natural phenomena, perception, and imagination. The animator designs the object’s dynamic behavior with a mental representation of causality. The animator imagines how it moves, becomes misshapen, or reacts when pushed, pressed, pulled, or twisted. So, the animation system must provide the user with motion control tools able to translate his or her wishes from his or her own language.
