Physically Inspired Stretching of Non-rigid Bodies

31th Spring Conference on Computer Graphics (SCCG 2015)

Michal Piovarči, Martin Madaras

Abstract

We propose a physically inspired stretching model for non-rigid bodies with linear skeletons. Given an input model composed of linear skeleton segments, it extract scaling matrices that can be directly used in skinning animation. The stretching model evaluates stretching in two directions, stretching of the body cause by gravitational force and stretching of the body caused by muscle contraction. Our model is based on small deformation theory, which can be directly applied on cylindrical shapes. Since the input body may differ a little bit from cylindrical shape, it is decomposed into several cylindrical parts and a volume approximation is used for scaling of the physical functions. Next, the body is stretched along the skeleton based on the function derived from the sum of skeleton curvature. Finally, a system for the visualization of a particle-based simulation using linear blend skinning is created and enhanced with out stretching model.