Physically Based Motion Transformation

How to read this

Category

Method: physically based motion editing

Contributions

• Physically based motion transformation: animator edits are propagated through a spacetime optimization over a simplified physical model of the character
• Edited motion stays physically plausible (respecting momentum, mass, and forces) while satisfying new constraints
• Enables retargeting and stylistic edits that preserve dynamic realism

Context

Builds on Witkin and Kass's Spacetime Constraints and on the same authors' Motion Warping, adding a physics layer so edits remain dynamically valid rather than purely signal-based.Builds on: Spacetime Constraints · Motion Warping

Correctness

Plausibility rests on a simplified physical character model, so fidelity is bounded by how well that simplification captures the real dynamics, and the spacetime optimization can be expensive and sensitive to setup.

Clarity

Conceptually clear but optimization-heavy; a first pass conveys why physics-aware editing matters, a second pass pays off for the spacetime formulation.

How to read it

First pass for the contrast with purely kinematic warping/retargeting; second pass on the simplified physical model and the spacetime optimization if you need physically valid edits.