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Motion Warping
Motion editing technique warping captured animations to meet user-defined spacetime constraints while preserving dynamic continuity.
Abstract
This paper introduces motion warping, a technique for editing captured or keyframed animation by warping the motion parameter curves. The animator interactively defines keyframe-like constraints that derive a smooth deformation preserving the fine high-frequency structure of the original motion, while time warp constraints retime the motion via an interpolating Cardinal spline. Motion clips are combined by overlapping and blending the parameter curves with a slow-in/slow-out weight function. The authors show that whole families of realistic motions, such as varied human walks and tennis swings, can be created from a single captured sequence using only a few warping keyframes.
How to read this
- Category
- Method: a motion-editing technique
- Contributions
- Motion warping: editing captured or keyframed animation by warping its parameter curves to meet keyframe-like constraints while preserving fine high-frequency detail
- Time-warp constraints that retime motion via an interpolating Cardinal spline
- Blending of overlapping clips with a slow-in/slow-out weight function to synthesize motion families from a single sequence
- Context
- Builds on keyframe-animation lineage (Burtnyk and Wein's interactive skeleton key-frame techniques) and underpins later constraint-based editing such as Gleicher's retargeting.Builds on: Interactive Skeleton Techniques for Enhancing Motion Dynamics in Key Frame Animation
- Correctness
- Demonstrated on motions like human walks and tennis swings; it is a signal-deformation method with no notion of physics, so warped results preserve style but are not guaranteed to remain physically plausible.
- Clarity
- Accessible; a first pass conveys the idea, do a second pass for the curve-warping and time-warp formulation.
- How to read it
- First pass for the warp-the-curves intuition and the constraint types; second pass to understand the deformation and retiming math if you plan to implement editing.
Built upon by
Related work
- Retargeting Motion to New Characters 1998 / SIGGRAPH
- Optimal and Interactive Keyframe Selection for Motion Capture 2018 / SIGGRAPH Asia
- Automated Extraction and Parameterization of Motions in Large Data Sets 2004 / SIGGRAPH
- Motion Retargeting for Crowd Simulation 2015 / DigiPro
Keywords
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