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最近在阅读RealTimeRendering时遇到一个问题,作者说四种灯光然后六个光源一共要84种Shader,有点不清楚怎么算得,然后写了一个递归算法实现了一下。也可以表视为四种苹果(至多四种,可能1,2,3,4种)放到六个篮子里面,每个篮子有且只有一种苹果,多少种放法。
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