Discrete and computational geometry : Japanese conference JCDCG 98 Tokyo Japan December 9 12 1998 ; revised papers This book constitutes the thoroughly refereed post conference proceedings of the Second Japanese Conference on Discrete and Computational Geometry JCDCG8 held in Tokyo Japan in December 1999. The 27 revised full papers presented were carefully reviewed and selected for inclusion in the post conference proceedings. Among the topics addressed are approximation convex hulls lattice computations tilings graph computations Voronoi diagrams clustering graph drawing diagram design and illumination problems