https://docs.unity.com/en-us/engine/6000.6/manual/materials-and-shaders/built-in/shader-built-in-configure-properties/standard-shader-texture-maps/material-parameter-normal-map/map
Introduction to normal maps (bump mapping) • Unity Editor • Unity Docs
Learn about how normal maps work, and the difference between bump maps, normal maps and height maps.
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https://www.educative.io/answers/how-to-create-the-illusion-of-depth-using-bump-mapping
How to create the illusion of depth using bump mapping
Contributor: Bakhtiar Rasheed
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