Shadow Polygon Reduction Techniques

概要

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Shadow volume algorithm was introduced by Frank Crow in 1977. It allows concave polygons with holes and any number of light sources anywhere in 3D space in the scanline process. But it is expensive for image synthesis on the complex environment, because it generates a lot of shadow polygons. This paper presents shadow polygon reduction techniques in order to relax the restrictions under polygonal database. The techniques are a use of co-plane surface data structure, shadowing polygon determination using space subdivision, and contour edge extraction. By using the techniques, shadow volume algorithm becomes effective on the complex environment.
一般社団法人情報処理学会の論文
1989-03-15