Defining actions by sample figures in CBAD

The authors propose a method of defining new motions of actors in animation sequences. A user defines a new motion by sample figures that describe the initial state of the motion, the interim state, and the final state. Their system, CBAD, analyzes these figures and detects the differences among them. Then, CBAD represents these differences by a set of primitive predefined actions, and lets the new motion be the set. The new motion is expressed at an abstract level, which means that the parameters of the primitive action are positional relations among actors. CBAD changes the positional relations to specific coordinate values at play time by using a constraint solver mechanism