Modeling Relaxed Hand Shape for Character Animation

We present a technique for modeling the deformations that occur to hand pose under the influence of gravity when the hand is kept in a relaxed state. A dynamic model of the hand is built using Proportional-Derivative controllers as a first order approximation to muscles. A process for tuning the model to match the relaxed hand shape of subjects is discussed. Once the model is tuned, it can be used to sample the space of all possible arm orientations and samples of wrist and finger angles are taken. From these samples, a kinematic model of passive hand deformation is built. Either the tuned dynamic model or the kinematic model can be used to generate final animations. These techniques increase the realism of gesture animation, where the character often maintains a relaxed hand

[1]  Dinesh K. Pai,et al.  EigenSkin: real time large deformation character skinning in hardware , 2002, SCA '02.

[2]  Xudong Zhang,et al.  Quantitative analysis of finger motion coordination in hand manipulative and gestic acts. , 2004, Human movement science.

[3]  Michael Girard,et al.  Computer animation of knowledge-based human grasping , 1991, SIGGRAPH.

[4]  Hans-Peter Seidel,et al.  Eurographics/siggraph Symposium on Computer Animation (2003) Construction and Animation of Anatomically Based Human Hand Models , 2022 .

[5]  Michael Neff,et al.  Modeling tension and relaxation for computer animation , 2002, SCA '02.

[6]  Jacob D. Furst,et al.  An improved articulated model of the human hand , 2001, The Visual Computer.

[7]  Mihriban Whitmore,et al.  Evaluation of Neutral Body Posture on Shuttle Mission STS-57 (SPACEHAB-1). Revision , 2003 .

[8]  Demetri Terzopoulos,et al.  Synthetic motion capture: Implementing an interactive virtual marine world , 1999, The Visual Computer.

[9]  Karan Singh,et al.  Eurographics/siggraph Symposium on Computer Animation (2003) Handrix: Animating the Human Hand , 2003 .

[10]  Jean-Claude Latombe,et al.  Interactive simulation of the human hand , 2002 .

[11]  Eugene Fiume,et al.  Helping hand: an anatomically accurate inverse dynamics solution for unconstrained hand motion , 2005, SCA '05.

[12]  Tsuneya Kurihara,et al.  Modeling deformable human hands from medical images , 2004, SCA '04.

[13]  Ying Wu,et al.  Modeling the constraints of human hand motion , 2000, Proceedings Workshop on Human Motion.

[14]  Daniel Thalmann,et al.  A Hand Control and Automatic Grasping System for Synthetic Actors , 1994, Comput. Graph. Forum.

[15]  Victor B. Zordan,et al.  Physically based grasping control from example , 2005, SCA '05.