Stretch It - Realistic Smooth Skinning

Smooth skinning is still the most popular method for the animation of deformable human and creature characters. It has became almost an industry standard because of its intuitiveness to use and efficiency to compute. However it suffers from a number of problems, such as the collapsing elbow and candy-wrapper effect. In this paper, we present a new method, which is able to solve these defects with very little extra stretching computations. The advantage of this method is its compatibility with the current animation workflow. The animator can change the skin weight any way they like and therefore it favours creativity. The aim of our method is trying to retain the realism and computational efficiency at the same time. It is suitable for situations, where real time response is necessary, like computer games. A practical implementation in the form of a Maya plug-in is created to demonstrate the viability of the method

[1]  Edwin Catmull,et al.  A system for computer generated movies , 1972, ACM Annual Conference.

[2]  K. Akeley,et al.  Proceedings of the 24th annual conference on Computer graphics and interactive techniques , 2000, SIGGRAPH 2000.

[3]  David Zeltzer,et al.  Pump it up: computer animation of a biomechanically based model of muscle using the finite element method , 1992, SIGGRAPH.

[4]  Cary B. Phillips,et al.  Multi-weight enveloping: least-squares approximation techniques for skin animation , 2002, SCA '02.

[5]  Jane Wilhelms,et al.  Anatomically based modeling , 1997, SIGGRAPH.

[6]  Jian J. Zhang,et al.  Realistic Skeleton Driven Skin Deformation , 2005, ICCSA.

[7]  Wayne E. Carlson,et al.  Anatomy-based modeling of the human musculature , 1997, SIGGRAPH.

[8]  Zoran Popovic,et al.  Articulated body deformation from range scan data , 2002, SIGGRAPH.

[9]  John Hart,et al.  ACM Transactions on Graphics: Editorial , 2003, SIGGRAPH 2003.

[10]  Daniel Thalmann,et al.  Modeling and deformation of the human body using an anatomically-based approach , 1998, Proceedings Computer Animation '98 (Cat. No.98EX169).

[11]  D. Shepard.  A two-dimensional interpolation function for irregularly-spaced data , 1968, ACM National Conference.

[12]  John P. Lewis,et al.  Pose Space Deformation: A Unified Approach to Shape Interpolation and Skeleton-Driven Deformation , 2000, SIGGRAPH.

[13]  Michael Gleicher,et al.  Building efficient, accurate character skins from examples , 2003, ACM Trans. Graph..

[14]  Jirí Zára,et al.  Spherical blend skinning: a real-time deformation of articulated models , 2005, I3D '05.

[15]  Daniel Thalmann,et al.  Joint-dependent local deformations for hand animation and object grasping , 1989 .