Ambient occlusion

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Ambient occlusion is a technique used in 3D computer graphics. In real life, if something is surrounded by other things, it is more likely to be blocked out by a shadow cast upon it, or "occluded". Ambient occlusion calculates how much of some object, such as a surface, is blocked out by something else as compared to how much of that object is open to the rest of the environment. Things surrounded by other things that can occlude it or block it out are drawn darker than things more open to the environment, which are drawn lighter.