Cage-Based Deformation Transfer Using Mass-Spring System

In this thesis we propose a method for deformation transfer. Given a source reference model and its deformed model, we want to compute the deformation of a target reference model. We construct a cage which encloses the source reference model, and construct the correspondence between the cage and those of the source deformed model and the target reference model to guarantee these three cages have same topology. Each cage is associated with a mass-spring system, and then the spring stretchiness ratios between the source reference cage and the source deformed cage are applied to the target reference cage. After computing the equilibrium state from spring stretchiness configuration of the target mass spring system, we get the deformed cage of the target model. Finally, we use the target deformed cage to reconstruct the target deformed model by vertex coordinate interpolation. Using mass-spring systems allows us to take physical effects into consideration when performing deformation transfer, and combining with cage-based deformation method alleviates the artifact of collapsed surface caused by mass-spring systems and makes the result more stable.