Funding for this research was provided by:
Natural Science Foundation of Hunan Province (2020JJ4434)
Key Scientific Research Projects of Department of Education of Hunan Province (19A312)
Hunan Provincial Science & Technology Project (2018TP1018, 2018RS3065)
National Natural Science Foundation of China (61502254)
Open Project Program of the State Key Lab of CAD&CG (A1926)
Article History
Accepted: 6 December 2020
First Online: 3 January 2021