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Hierarchical spacetime control
SIGGRAPH '94 Proceedings of the 21st annual conference on Computer graphics and interactive techniques
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Motion editing with spacetime constraints
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Proceedings of the 25th annual conference on Computer graphics and interactive techniques
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Proceedings of the 26th annual conference on Computer graphics and interactive techniques
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CA '02 Proceedings of the Computer Animation
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PG '03 Proceedings of the 11th Pacific Conference on Computer Graphics and Applications
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IEEE Computer Graphics and Applications
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AMDO '08 Proceedings of the 5th international conference on Articulated Motion and Deformable Objects
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ACM Transactions on Graphics (TOG)
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MIG'10 Proceedings of the Third international conference on Motion in games
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SCA '11 Proceedings of the 2011 ACM SIGGRAPH/Eurographics Symposium on Computer Animation
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ISVC'06 Proceedings of the Second international conference on Advances in Visual Computing - Volume Part I
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Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Computer Animation
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This article presents a novel constraint-based motion editing technique. On the basis of animator-specified kinematic and dynamic constraints, the method converts a given captured or animated motion to a physically plausible motion. In contrast to previous methods using spacetime optimization, we cast the motion editing problem as a constrained state estimation problem, based on the per-frame Kalman filter framework. The method works as a filter that sequentially scans the input motion to produce a stream of output motion frames at a stable interactive rate. Animators can tune several filter parameters to adjust to different motions, turn the constraints on or off based on their contributions to the final result, or provide a rough sketch (kinematic hint) as an effective way of producing the desired motion. Experiments on various systems show that the technique processes the motions of a human with 54 degrees of freedom, at about 150 fps when only kinematic constraints are applied, and at about 10 fps when both kinematic and dynamic constraints are applied. Experiments on various types of motion show that the proposed method produces remarkably realistic animations.