JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE C 2011 Vol.12 No.11 P.867-872

Sketch-based rotation editing

Author(s): Yue Xie, Wei-wei Xu, Yi-zhou Yu, Yan-lin Weng
Affiliation(s): School of Computer Science and Technology, Zhejiang University, Hangzhou 310027, China, Internet Graphics Group, Microsoft Research Asia, Beijing 100190, China, Department of Computer Science, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Corresponding email(s): xie.full@gmail.com, wwxu@microsoft.com, yyz@illinois.edu, weng@cad.zju.edu.cn
Key Words: Quaternions, Keyframe interpolation, Animation editing

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Abstract: We present a sketch-based rotation editing system for enriching rotational motion in keyframe animations. Given a set of keyframe orientations of a rigid object, the user first edits its angular velocity trajectory by sketching curves, and then the system computes the altered rotational motion by solving a variational curve fitting problem. The solved rotational motion not only satisfies the orientation constraints at the keyframes, but also fits well the user-specified angular velocity trajectory. Our system is simple and easy to use. We demonstrate its usefulness by adding interesting and realistic rotational details to several keyframe animations.

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