Abstract
This paper describes the generation and realistic blending of emotional facial expressions, visual speech, facial poses and other non-emotional secondary facial expressions on 3D computer graphical head models. The generation and blending of these expressions is done by means of the mathematical formulation of a psychological theory of facial expression generation. In total, 23 emotional expressions, 21 emotion blends, 19 visemes, 342 viseme blends and 37 secondary expressions and postures have been modelled, which can result in an infinite number of realistic facial expressions, due to the blending of these entities at different intensities that may vary continuously with time. The blending algorithm enables animators to script their animations at higher, more user-friendly levels or to use the results of artificial intelligence and computational psychological methods to generate and manage expressive, autonomous or near-autonomous virtual characters, without having to rely on performance-based methods.
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