oshinori Dobashi is an Associate Professor at the Graduate School of Information Science and Technology, Hokkaido University. He received his Ph.D. in Engineering from Hiroshima University, and his research interests center on computer graphics, including realistic rendering, fluid simulation and sound modeling. He has published numerous papers at leading computer graphics conferences and in respected journals, such as ACM SIGGRAPH. He has received several best paper awards from major computer graphics conferences, including EUROGRAPHICS. He also received a Commendation for Science and Technology (Research Category) from the Minister of Education, Culture, Sports, Science and Technology. He is one of the leading researchers in the computer graphics community in Japan. Shizuo Kaji is an Associate Professor at the Institute of Mathematics for Industry, Kyushu University.  He received Ph.D. from the Department of Mathematics, Kyoto University in 2007. His research interest is in topology and its applications in computer sciences. He is currently a PRESTO researcher at the Japan Science and Technology Agency (JST), working on a project on the mathematics of computer graphics. Kei Iwasaki is currently an Associate Professor at the Faculty of Systems Engineering at Wakayama University. He received his Ph.D. degree from The University of Tokyo in 2004. His research interests include computer graphics, real-time rendering and visual simulation.