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Matyka, M. and Ollila, M. "A pressure model for soft body simulation", Proc. of Sigrad, Umea, November 2003 
Abstract: Motivated by existing models used for soft body simulation which are rather complex to implement, we present a novel technique which is based on simple laws of physics and gives high quality results in real-time. We base the implementation on simple thermodynamics laws and use the Clausius-Clapeyron state equation for pressure calculation. In addition, this provides us with a pressure force that is accumulated into a force accumulator of a 3D mesh object by using an existing spring-mass engine. Finally after integration of Newtons second law we obtain the behavior of a soft body with fixed or non-fixed air pressure inside of it. CR Categories: I.6.8 [Simulation and Modeling]: Types of Simulation—Animation; I.3.5 [Computer Graphics]: Computational Geometry and Object Modeling—Physically based modeling I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism—Animation. Keywords: physically based modeling, animation Paper: [download] (~330kb)
Presentation: [download] (~340kb)
[download] (divx 4.12, ~31 MB) [download] (mpg1, ~53 MB) 
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