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Issue No. 01 - January/February (2010 vol. 16)
ISSN: 1077-2626
pp: 70-80
Nipun Kwatra , Stanford University, Stanford
Chris Wojtan , Georgia Institute of Technology, Atlanta
Mark Carlson , DreamWorks Animation, Mountain View
Irfan Essa , Georgia Institute of Technology, Atlanta
Peter J. Mucha , University of North Carolina at Chapel Hill, Chapel Hill
Greg Turk , Georgia Institute of Technology, Atlanta
We present an algorithm for creating realistic animations of characters that are swimming through fluids. Our approach combines dynamic simulation with data-driven kinematic motions (motion capture data) to produce realistic animation in a fluid. The interaction of the articulated body with the fluid is performed by incorporating joint constraints with rigid animation and by extending a solid/fluid coupling method to handle articulated chains. Our solver takes as input the current state of the simulation and calculates the angular and linear accelerations of the connected bodies needed to match a particular motion sequence for the articulated body. These accelerations are used to estimate the forces and torques that are then applied to each joint. Based on this approach, we demonstrate simulated swimming results for a variety of different strokes, including crawl, backstroke, breaststroke, and butterfly. The ability to have articulated bodies interact with fluids also allows us to generate simulations of simple water creatures that are driven by simple controllers.
Physically-based animation, fluid simulation, motion capture.

I. Essa, C. Wojtan, M. Carlson, N. Kwatra, P. J. Mucha and G. Turk, "Fluid Simulation with Articulated Bodies," in IEEE Transactions on Visualization & Computer Graphics, vol. 16, no. , pp. 70-80, 2009.
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