: Spatial key −framing is one of the methods for generating animation of CG charactcrs , in which a control point corresponding to a fhlr body posture is defined in a workspace , and animation is generatcd by moving thc control point in the workspace . In this paper , we try to develop a CG character animation by generating a trajectory efthe control point semi −automatically intcracting with a user . We introduce a nonlinear oscillator ( van der Pol equation ) f{)r the trajectory generation ,

more »

... nd evaluate how much it can create a variety of motion and how much it can reflect a user intention , through a computer simulation .