1. State Key Lab of Cad&CG, Zhejiang University, Hangzhou, Zhejiang, China
2. School of Computer Science, Zhejiang University, Hangzhou, Zhejiang, China
3. School of Data Science, Fudan University, Shanghai, China
4. School of Mathematics and Computer Science, Technische Universiteit Eindhoven, Eindhoven, AZ, The Netherlands