1.8 - 环境遮挡

后期处理示例关卡概述，示例1.8： 环境遮挡

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屏幕空间环境光遮挡（SSAO）是一种近似计算因遮蔽而造成的光线衰减的效果。通常是在标准全局光照的基础上增添细微效果，例如让角落、裂缝或其他生物变暗，以形成一种更加自然真实的视觉效果。

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