中文摘要：

Wei Hu is currently a Ph.D. candidate in the Department of computer science and technology, Tsinghua University. His research interests include computer graphics, parallel rendering and GPU computing.E-mail：huw02@mails．tsinghua．edu．cn Kai-Huai Qin is a professor of computer science and technology, at Tsinghua University. He received his Ph.D. and M.Eng. degrees from Huazhong University of Science and Technology in 1990 and 1984, and his B.Eng. degree from South China University of Technology in 1982. He was a visiting scholar at SPL, BWH, and Harvard Medical School during1999-2000. His research interests include computer graphics, CAGD, curves and surfaces, especially subdivision surfaces and NURBS modeling, physics-based geometric modeling, wavelets, medical visualization, surgical planning and simulation, virtual reality and intelligent and smart CAD/CAM.E-mail：qkh-dcs@tsinghua．edu．cn； Hua-Wei Wang is currently working as a postdoctoral researcher at Institute of High Performance Computing of Tsinghua University. He received his Ph.D. and M.E. degrees from Department of Computer Science and Technology, Tsinghua University in 2004, and his B.Sc. and B.Eng. degrees from Department of Applied Mathematics and Department of Computer Science and Technology, respectively, Tsinghua University in July, 1998. His research interests include computer graphics, computer aided geometric design, curves and surfaces, physics-based geometric modeling, etc.E-mail：hwwang@tsinghua．edu．cn； Ya-Feng Li is a Ph.D. candidate in the Department of Computer Science and Technology, Tsinghua University. His research interests include computer graphics.E-mail：lyf99@mails．tsinghua．edu．cn