Skeleton-driven dynamics modeling for computer-aided muscular rehabilitation

animating a skeletal character in computer-aided muscular rehabilitation, we innovate in both skinning and dynamic simulation. First, a new rigging scheme is proposed for transforming the bone- constrained nodes; and the motion of the unconstrained nodes can be efficiently computed by dynamic deformation simulation. Secondly, a position-based dynamics framework is employed; instead of geometrical constraints, nonlinear strain-based constraints are utilized in the tetrahedral body mesh deformation. Thirdly, in order to improve the computational performance, a unique layered constraint solving scheme is designed to solve the constraints in an ordered way; anisotropic deformations of the body mesh can be achieved by the desired stretch and shear coefficients in the different layers. Finally, we provide an interactive tool for local reference frames which control the anisotropic deformation behaviours. Real-time skeletal animation can be realized, and the model is stable even in the cases of large deformation and degeneration. The comparative advantages over the competing methods are presented and verified with experiments.