Shadows are essential to realistic and visually appealing images, but they are difficult to compute in most display environments especially in computer games. Since the introduction of shadow volume by Crow (1977), shadow map by William (1978) and then fake shadows by Blinn (1988, 1996), a lot of development has been done to improve shadow algorithm in real-time graphic application. Current issues about shadow are on real-time dynamic soft shadows and hardware improvement that improvised real- time shadow generation.
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