By default Unreal Engine uses the Lumen method as the Global Illumination and Reflections. By utilizing and using Material Ambient Occlusion, You can bring realism to your scenes, objects, and characters and level up the visual to the next level. In this article, we will learn how to implement and work with it.
https://dev.epicgames.com/community/learning/tutorials/bOEy/material-ambient-occlusion-ao-in-unreal-engine-5
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