164 chapter 5 ■ Texture Painting
Model by Ricardo ArizaUVs help determine the amount of pixel space
on a map that is devoted to an area. In the UV layout
in Figure 5.3, the head and hands get 25 percent of the
map space and the rest of the body gets 75 percent.
Hand-laying UVs also allows you to determine what
parts get the most pixels and importance while smaller
objects or areas get less pixel space. In automatic map-
ping like Automatic UV (AUV) tiles, the texture space
is divided evenly over the whole object. This ensures
there is no wasted texture space, but it also gives all
areas of the character equal resolution, which is not
Figure 5.1 Unwrapped soccer ball always desirable.
Figure 5.2 A head model and corresponding hand-laid UVs
Figure 5.3 75/25 UV layout example