Most commercially available computer animation systems are based on animating with keyframes. At first, this seems like the same thing as keyframes in traditional hand-drawn animation, but it is slightly different, and therefore, you should approach your animation differently. In hand-drawn animation, you work on the basic poses of the scene first, drawing poses of the entire character so the timing and acting can be worked out with a minimum of drawings created. Once the poses are finalized, then the inbetween drawings are created to complete the action. With computer animation, keyframes are values at certain frames for the articulation controls of a model, which are usually set up in a hierarchy. The computer calculates the inbetweens values based on a spline curve connecting the keyframe values.