Li Gang received his master degree from the Graphics & Interactive Technology Laboratory, Peking University in 2016. His current research interests include GIS, image feature extraction and data visualization. He can be reached by hunangangli@gmail.com. Corresponding author: Lai Shunnan, Female, Master, Engineer, E-mail: snlai@pku.edu.cn.Lai Shunnan is currently an engineer in School of Electronics Engineering and Computer Science, Peking University. Her current research interests include virtual Simulation, Sensor technology. She can bereached at snlai@pku.edu.cn. Li Sheng is currently an associate professor in School of Electronics Engineering and Computer Science, Peking University. His current research interests include virtual reality, real-time graphics, photorealistic rendering, physical simulation and parallel computing on GPU. He is member of China Computer Federation (CCF), ACM, IEEE. He can be reached at lisheng@pku.edu.cn.