Research on Keyframe Animation Generation Method of Elastic Body Based on Inverse Finite Element Optimization Analysis

This paper proposes a keyframe animation method of elasitc body based on inverse Finite Element Method (FEM) analysis, which constructs a multi-objective optimization process and makes a space-time optimization analysis on the keyframes in deformation space to reconstruct a user-specified deformation space of target model. By introducing signed distance field, we translate user-specified keyframe shapes into implicit surfaces, which makes our method suitable for various data format. We define an objective function measuring the distance from displacement field to implicit surface, and meanwhile introduce inverse FEM into iterative optimization process to obtain optimal control force field and model material parameter. And all experimental results show the validity of our method in accuracy and efficiency.