Normal maps are more commonly used
in video games than in 3D images. For a normal map to work, you need an texture
that has been designed as a normal map (bump map and displacement map, on the
other hand, only need a gray scale texture). For this tutorial, we'll not be
covering how to create a normal map texture.
A displacement map is real geometry
(polygons), while a bump map is tricks of light to make it look like it has
real geometry. Normal maps are like bump maps, as in the way they both trick
the light, but normal maps actually change the surfaces normal’s and bend the
light. Bump map renders faster but you do lose quality. Normal maps are used
more in low poly games. Displacement maps, because of their longer render time,
are mostly used on objects that need high level detail.
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