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Adapting Motion to New Characters: A Study on Constraint-Based Retargeting Method

This paper discusses the process of adapting motion data onto new character structures while preserving original motion properties. It introduces a spacetime constraints method for off-line retargeting, including constraint definition, modification of start points, B-spline representation, and constrained optimization. Key computational methods are outlined, and different solver types are explored. The need for potential re-modification of start points is addressed for optimal adaptation. The study emphasizes the use of geometric constraints and simple objective functions for successful retargeting. The presentation covers the paper's completeness, systematic introduction, expressive ability, and slide production, along with aspects of understanding content, result accuracy, originality, and significance. The method discussed is essential in utilizing motion capture data for adapting animations to different skeletal structures, providing crucial insights for research and implementation.

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Adapting Motion to New Characters: A Study on Constraint-Based Retargeting Method

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  1. Retargetting Motion to New Characters SIGGRAPH ’98 Speaker: Alvin Date: 6 July 2004

  2. Outline • Introduction • Framework • Result • Conclusion • Evaluation Form Retargetting Motion to New Characters

  3. Introduction • Adapting the motion with identical structure but different segment lengths. • Preserve properties of the original motion as many as possible. • The solver is spacetime constraints method. • The method is off-line. Retargetting Motion to New Characters

  4. Framework • Constraint Definition • Start Points Modification • B-spline Representation • Constrainted Optimisation • (optional) Start Points Re-modification Retargetting Motion to New Characters

  5. Start Points Modification Retargetting Motion to New Characters

  6. B-spline Representation • Use Motion Displacement Maps. • Use the solver to find d(t). • Cubic B-splines control points are spaced every 2,4, or 8 frames. Retargetting Motion to New Characters

  7. Constrainted Optimisation Objective Function • The key computation of this the retargetting approach. • The types of the solver: • Least-squares solver • SQP style solver • LMULT solver Retargetting Motion to New Characters

  8. Start Points Re-modification • If Constrainted Optimisation does not satisfy, replace M1(t) with (M1(t) + d(t)) and use a denser set of control points. Retargetting Motion to New Characters

  9. Result Retargetting Motion to New Characters

  10. Conclusion • Computing an adaptation as a constrained optimization. • Use geometric constraints and a simple objective function. Retargetting Motion to New Characters

  11. 論文簡報部份 完整性介紹(3) 系統性介紹(4) 表達能力(4) 投影片製作(3) 論文審閱部分 瞭解論文內容(3) 結果正確性與完整性(3) 原創性與重要性(5) 讀後啟發與應用： Evaluation Form 這篇論文所使用的方法是使用MoCap資料必備的基本常識 ，將動畫資料套用在同樣結構的不同骨架上，對於我們的 研究來說，這是必須實作完成的一項技術。 Retargetting Motion to New Characters

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