Screen Space Ambient Occlusion (SSAO) 是一种以后处理的方式模拟出场景接受环境光遮挡情况的图形渲染技术。直观地说，经过SSAO处理的场景，在其（接受环境光照较少的）被遮蔽处会呈现出些许明显的局部自阴影，进而提升场景整体的光影真实感。
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