用于某个区域内光源的光线数量。允许准确的柔和阴影。
这是要追踪某个区域内任意光源的最大光线数量。较大的光源需要更多光线才能产生无噪声输出。默认值适用于大多数场景设置,但如果您观察到噪声,则应增大此值。这会对性能产生重大影响,而且对于具有大量区域光源的场景,将此值减半会将烘焙时间缩短一半。
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