In 3D computer graphics, normal mapping, or "Dot3 bump mapping", is a technique used for faking the lighting of bumps and dents -
an implementation of Bump mapping. It is used to add details without using more polygons. A common use of this technique is to
greatly enhance the appearance and details of a low polygon model by generating a normal map from a high polygon model or height map.
Normal maps are commonly stored as regular RGB images where the RGB components corresponds to the X, Y, and Z coordinates,
respectively, of the surface normal.
Normal mapping (Off)
Normal mapping (On)