ABSTRACT
Motion systems are the mechanical architecture, a collection of joints, controls, and procedures that provide an interface for animation input. Essentially, the motion system has to do with everything outside of the actual deformation of the model. We start with an anatomy overview, including terminology for anatomical direction and motion, followed by a description of the computer graphics concepts required to implement skeletons. This is all brought together with some examples of classes, procedures, and constraints to tie the elements together.
