“God hath given you one face, and you make yourselves another.”
The primary goal of any face rig is to allow the creation a believable acting performance.
Facial animation is considered one of the most important aspects of creature and character animation, if not the most important. Expressions, emotions, feelings, thoughts, and lip-syncing are all factors that can and are acted through the face of a character. In fact, the face of a character or creature is capable of creating so many different states of emotion that it is a language anyone can understand, a worldwide, multinational, multicultural, barrier-breaking, ...