We give a fast algorithm to display Voronoi diagrams over planes and spheres using graphics hardwares. Hoff et al. [4] shows that graphics hardwares that are designed to display three dimensional objects over computer screens can be utilized to make images of 2-dimensional Voronoi diagrams. In this paper we analyze the discrepancy of the images of weighted Voronoi diagrams generated by graphics hardware. Moreover, we show a theoretically faster algorithm for Voronoi diagrams over the Euclidean plane. The refined version of the algorithm is about 4 times faster than the original algorithm by [4]. But it has some accuracy problems. In the latter part of this paper, we show an algorithm for Voronoi diagrams over a sphere and analyze the discrepancy of the images.
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