RayTracking 光線跟蹤算法

轉自 http://www.cnblogs.com/daniagger/archive/2012/05/28/2521318.html   詳細請看這位師兄的博客  1. Irradiance(輻照度) total amount of energy received per unit area of a surface   2. Illuminance(照明度) essentially same

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