启用烘焙环境光遮挡 (AO)。
环境光遮挡 (Ambient occlusion, AO) 可估算环境光照（不是来自特定方向的光照）照射到表面上某一点的光照的情况。它使彼此接近的折痕、孔和表面变暗。这些区域阻挡或遮挡环境光，因此看起来更暗。 您可以配置 AO 是否应影响直接光照和/或间接光照。默认值是仅间接光照。直接光照的 AO 在物理上不正确，但可用于实现特别的艺术风格。
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