Koji Koyamada

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ÐOne of the most effective techniques for developing efficient isosurfacing algorithms is the reduction of visits to nonisosurface cells. Recent algorithms have drastically reduced the unnecessary cost of visiting nonisosurface cells. The experimental results show almost optimal performance in their isosurfacing processes. However, most of them have a(More)
A high-performance algorithm for generating isosurfaces is presented. In this algorithm, extrema points in a scalar field are first extracted. A graph is then generated in which the extrema points are taken as nodes. Each arc of the graph has a list of IDs of the cells that are intersected by the arc. A boundary cell list ordered according to cells' values(More)
Hardware-accelerated image composition for sort-last parallel rendering has received increasing attention as an effective solution to increased performance demands brought about by the recent advances in commodity graphics accelerators. So far, several different hardware solutions for alpha and depth compositing have been proposed and a few of them have(More)
An iso.w~-fuct: cun. bt: cfii’citxtly generated by visiting uiljacent in.tcrsccted cells in oriler~ ins if the isosurfuct: were pr0pagutin.g itself. We prfxrio~~sly proposed (~71 e:ctrcmn yruph mcthofl, which generates in gruph conmctiq e.utrenmm points. The isostrrfuce propayation starts from sonLe of the intcrsectcd cells that are found both by visiting(More)
Recently, as the borders between research fields have become fuzzy, there have been increasing opportunities for researchers in different fields to collaborate with each other. VizGrid is a joint research project between universities, government institutions, Fujitsu, and other industry members that was partially founded by the Ministry of Education,(More)
A technique for visualizing intrusion-detection system log files using hierarchical data based on IP addresses represents the number of incidents for thousands of computers in one display space. Our technique applies a hierarchical data visualization technique that represents leaf nodes as black square icons and branch nodes as rectangular borders enclosing(More)