Affiliation: | (1) State Key Laboratory of CAD&CG, Zhejiang University, Hangzhou, 310027, P.R. China E-mail: {jqfeng, jin,peng}@cad.zju.edu.cn, CN;(2) Department of Complexity Science and Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan E-mail: nis@is.s.u-tokyo.ac.jp, JP |