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Issue No.04 - July/August (2011 vol.31)
pp: 34-44
Jie Tan , Georgia Institute of Technology
Karen Liu , Georgia Institute of Technology
Greg Turk , Georgia Institute of Technology
ABSTRACT
In computer animation, the proportional-derivative (PD) controller is a common technique for tracking characters' motion. A new formulation of the PD controller—stable PD (SPD)—allows arbitrarily high gains, even at large time steps. The key is to determine joint forces and torques while taking into account the character's positions and velocities in the next time step. SPD is stable even when combined with a physics simulator that uses simple Euler integration. SPD controllers have a variety of uses, including motion tracking in a physics simulator, keyframe interpolation with secondary motion, and constraint satisfaction for simulation.
INDEX TERMS
character animation, proportional-derivative controller, constrained dynamics, keyframe interpolation, computer graphics, graphics and multimedia
CITATION
Jie Tan, Karen Liu, Greg Turk, "Stable Proportional-Derivative Controllers", IEEE Computer Graphics and Applications, vol.31, no. 4, pp. 34-44, July/August 2011, doi:10.1109/MCG.2011.30
REFERENCES
1. V.B. Zordan, and J.K. Hodgins, "Motion Capture Driven Simulations That Hit and React," Proc. 2002 ACM Siggraph/Eurographics Symp. Computer Animation (SCA 02), ACM Press, 2002, pp. 89–96.
2. A. Witkin, "Physically Based Modeling: Principles and Practice-Constrained Dynamics," Siggraph Course Notes, ACM Press, 1997, pp. 11–21; www.cs.cmu.edu/~baraff/sigcourse/notesf.pdf.
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