Dealing with synthetic actors who move and behave realistically in virtual environments is a task which involves different disciplines like Mechanics, Physics, Robotics, Artificial Intelligence, Artificial Life, Biology, Cognitive Sciences and so on. In this paper we use the nature of the information required for controlling actors' motion and behaviour to propose a new classification of synthetic actors. A description of the different motion and behaviour techniques is presented. A set of Internet addresses of the most relevant research groups, commercial companies and other related sites in this area is also given.
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