Yi Guo was a research assistant at Polyhedral Structures Laboratory. Majoring in Computer Graphics and Game Technology, Yi was graduate student in the Computer and Information Science department at the University of Pennsylvania. His experience covered 3D geometric reconstruction, rendering, game developing, image processing and information system. Yi got his bachelors degree from Capital Normal University and won the China National Scholarship during his undergraduate period. His research interests include physically-based rendering, visualization of geospatial data, 3D image reconstruction and graphics processing.