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Computing Fast Secondary Skin Deformation of a 3D Character using GPU  

Kim, Jong-Hyuk (Ajou University)
Choi, Jung-Ju (Ajou University)
Publication Information
Journal of the Korea Computer Graphics Society / v.18, no.2, 2012 , pp. 55-62 More about this Journal
Abstract
This paper presents a new method to represent the secondary deformation effect using simple mass-spring simulation on the vertex shader of the GPU. For each skin vertex of a 3D character, a zero-length spring is connected to a virtual vertex that is to be rendered. When a skin vertex changes its position and velocity according to the character motion, the position of the corresponding virtual vertex is computed by mass-spring simulation in parallel on the GPU. The proposed method represents the secondary deformation effect very fast that shows the material property of a character skin during the animation. Applying the proposed technique dynamically can represent squash-and-stretch and follow-through effects which have been frequently shown in the traditional 2D animation, within a very small amount of additional computation. The proposed method is applicable to represent elastic skin deformation of a virtual character in an interactive animation environment such as games.
Keywords
secondary deformation; skin deformation; exaggeration; GPU; mass-spring;
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