You-Dong Liang

You-Dong Liang is a Chinese mathematician and educator best known for his work in geometric modeling and computer graphics, and for the Liang-Barsky algorithm. He was born on 19 July 1935 in Fuzhou, Fujian Province, studied geometry at Fudan University under Su Buqing, and after graduating in 1960 joined the mathematics faculty of Zhejiang University, where he chaired the mathematics department from 1984 to 1990 and promoted the development of geometric design and graphics. He was a visiting scholar or professor at the University of California at Berkeley, the University of Utah and the University of Berlin. In 1984 he developed the Liang-Barsky line clipping algorithm, which has applications in computer graphics, and he improved it further in 1992. In the late 1980s and early 1990s he proposed theories and methods for geometric continuity of curves and surfaces, and he helped form the Computational Geometry Collaborative Group in China. His honours include a Chinese National Science third prize in 1991 and a Chinese award for geometric design and calculation contribution in 2009, and he has published more than fifty papers on clipping, geometric continuity and related topics.