说明：  基于模型的三维骨架抽取，希望对大家有用！
(Example-Based Skeleton Extraction.It present a method for extracting a hierarchical, rigid skeleton from a set of example poses. It then use this skeleton to not only reproduce the example poses, but create new deformations in the same style as the examples. Since rigid skeletons are used by most 3D modeling software, this skeleton and the corresponding vertex weights can be inserted directly into existing production pipelines. )