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Surface Normals



an object such as a line, ray, or vector that is perpendicular to a given object. 



SOURCE:
https://www.yourdictionary.com/tessellation#computer


Normal Maps in Cideo Games
Most texture maps for assets in video games have bitmaps and normal maps. The normal map has a low poly count and is essentiallt a flat 2d image that sharpens an object with highlights. 

Image Source:
https://blog.teamtreehouse.com/understanding-normal-maps



SOURCE:
https://blog.teamtreehouse.com/understanding-normal-maps

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