Not all animal movements can be pre-recorded with motion capture
techniques, simply because there are an unlimited number of
possible movements. There are also aspects of the animation that
can not be pre-determined. For example, the animal may turn its
head to a certain object that draws its attention. How much the
head turns can not be pre-determined and simulated with a limited
pool of animation sequences. Although many movements can be
approximated with a limited number of animation sequences, it is
not desirable due to poor aesthetic quality. It is important to control
some aspects of the animation through software procedures.