Contextual Affordances for Intelligent Virtual Characters
Building artificial intelligence for games is an extremely involved process, and the cost of developing AI for minor characters may be greater than the payoff in increased immersion. Affordances, used to create smart objects, reduce the complexity of character controllers. While affordances improve the complexity of individual controllers, the technique does not take advantage of environmental information to reduce the behavioral decision space. We present contextual affordances, which extend basic affordances to use context from object, agent, and environmental state to present only the most relevant actions to characters. We show how contextual affordances improve even random-decision agents, and discuss the complexity of building contextual objects.
KeywordsAction Space Smart Object Character Controller Random Character Minor Character
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- 1.BioWare. Dragon Age: Origins, Fantasy Role-Playing Game (2009), http://dragonage.bioware.com/
- 2.Cerpa, D.H., Champandard, A., Dawe, M.: Behavior Trees: Three Ways of Cultivating Strong AI. Talk at the 2010 AI Summit at the Game Developers Conference (GDC) (2010), http://gdcvault.com/play/1012744/Behavior-Trees-Three-Ways-of
- 3.Gibson, J.J.: The theory of affordances. In: Gibson, J.J. (ed.) Perceiving, Acting, and Knowing. Lawrence Erlbaum Associates, Mahwah (1977)Google Scholar
- 4.Isla, D.: Handling Complexity in the Halo 2 AI. In: Proceedings of the 2005 Game Developers Conference (2005)Google Scholar
- 5.Matarić, M.J.: Behavior-based control: Main properties and implications. In: Proceedings, IEEE International Conference on Robotics and Automation, Workshop on Architectures for Intelligent Control Systems, pp. 46–54 (1992)Google Scholar
- 6.Norman, D.A.: The Design of Everyday Things. Basic Books, New York (2002)Google Scholar
- 7.Orkin, J.: Three States and a Plan: The AI of F.E.A.R. In: Proceedings of the Game Developer’s Conference, GDC (2006)Google Scholar
- 8.Simpson, J.: Scripting and Sims2: Coding the Psychology of Little People. Talk at the 2005 Game Developers Conference (GDC) (2005), https://www.cmpevents.com/Sessions/GD/ScriptingAndSims2.ppt