Natural Motion Animation through Constraining and Deconstraining at Will

This paper presents a computational technique for creating whole-body motions of human and animal characters without reference motion. Our work enables animators to generate a natural motion by dragging a link to an arbitrary position with any number of links pinned in the global frame, as well as other constraints such as desired joint angles and joint motion ranges. The method leads to an intuitive pin-and-drag interface where the user can generate whole-body motions by simply switching on or off or strengthening or weakening the constraints. This work is based on a new interactive inverse kinematics technique that allows more flexible attachment of pins and various types of constraints. Editing or retargeting captured motion requires only a small modification to the original method, although it can also create natural motions from scratch. We demonstrate the usefulness and advantage of our method with a number of example motion clips.

[1]  J. Y. S. Luh,et al.  Resolved-acceleration control of mechanical manipulators , 1980 .

[2]  Badler,et al.  Techniques for Generating the Goal-Directed Motion of Articulated Structures , 1982, IEEE Computer Graphics and Applications.

[3]  H. Haken.  Advanced Synergetics: Instability Hierarchies of Self-Organizing Systems and Devices , 1983 .

[4]  W. W. Schrader,et al.  Efficient Computation of the Jacobian for Robot Manipulators , 1984 .

[5]  Yoshihiko Nakamura,et al.  Inverse kinematic solutions with singularity robustness for robot manipulator control , 1986 .

[6]  Francis L. Merat,et al.  Introduction to robotics: Mechanics and control , 1987, IEEE J. Robotics Autom..

[7]  T. Yoshikawa,et al.  Task-Priority Based Redundancy Control of Robot Manipulators , 1987 .

[8]  Norman I. Badler,et al.  Multi-dimensional input techniques and articulated figure positioning by multiple constraints , 1987, I3D '86.

[9]  Norman I. Badler,et al.  JACK: a toolkit for manipulating articulated figures , 1988, UIST '88.

[10]  A. A. Maciejewsk.  Dealing with the Ill-Conditioned Epuations of Motion for Articulated Figures , 1990 .

[11]  Yoshihiko Nakamura,et al.  Advanced robotics - redundancy and optimization , 1990 .

[12]  Norman I. Badler,et al.  Interactive real-time articulated figure manipulation using multiple kinematic constraints , 1990, I3D '90.

[13]  Anthony A. Maciejewski,et al.  Dealing with the ill-conditioned equations of motion for articulated figures , 1990, IEEE Computer Graphics and Applications.

[14]  Stephen H. Lane,et al.  Senses, Skills, Reactions and Reflexes: Learning Automatic Behaviors in Multi-Sensory Robotic Systems , 1993 .

[15]  Michael F. Cohen,et al.  Efficient generation of motion transitions using spacetime constraints , 1996, SIGGRAPH.

[16]  Michael Gleicher,et al.  Retargetting motion to new characters , 1998, SIGGRAPH.

[17]  Sung Yong Shin,et al.  A hierarchical approach to interactive motion editing for human-like figures , 1999, SIGGRAPH.

[18]  Katsu Yamane,et al.  Dynamics computation of structure-varying kinematic chains and its application to human figures , 2000, IEEE Trans. Robotics Autom..

[19]  Daniel Thalmann,et al.  Human shoulder modeling including scapulo-thoracic constraint and joint sinus cones , 2000, Comput. Graph..

[20]  Nancy S. Pollard,et al.  Force-based motion editing for locomotion tasks , 2000, Proceedings 2000 ICRA. Millennium Conference. IEEE International Conference on Robotics and Automation. Symposia Proceedings (Cat. No.00CH37065).

[21]  Zoran Popovic,et al.  Editing dynamic properties of captured human motion , 2000, Proceedings 2000 ICRA. Millennium Conference. IEEE International Conference on Robotics and Automation. Symposia Proceedings (Cat. No.00CH37065).

[22]  Kwang-Jin Choi,et al.  Online motion retargetting , 2000, Comput. Animat. Virtual Worlds.

[23]  Peter-Pike J. Sloan,et al.  Artist‐Directed Inverse‐Kinematics Using Radial Basis Function Interpolation , 2001, Comput. Graph. Forum.

[24]  Katsu Yamane,et al.  Dynamics Filter - concept and implementation of online motion Generator for human figures , 2000, IEEE Trans. Robotics Autom..