Shaders and Texturing - An Introduction to Computer Graphics for Artists - page 203

Fig. 11.25 Hexabot robot courtesy of Neville Marcinkowski (design and model) and Simon van
den Broek (textures and lighting) (Rendered with normal maps)
Fig. 11.26 Hexabot robot courtesy of Neville Marcinkowski and Simon van den Broek rendered
with color, normal, and specular maps
maps. For this reason, they are best used to represent surface detail as opposed to the
kind of extruded structures that a displacement map would be used for.