You’ve now arrived at the goal of this chapter: the wrinkle maps. These maps are basically an animated or weighted normal map that is connected to the movement of the face. For example, smiling may reveal the dimples in the cheeks of the characters. These small deformations occur as a result of the underlying muscles in the face moving. Another example of this phenomenon is wrinkles that appear (or disappear) on the forehead as a person raises or lowers his or her eyebrows. The use of wrinkle maps in games is still a recent addition, and most games today don’t bother with it unless the characters are shown in close-up. Figure 12.14 shows a grayscale image of a normal map containing wrinkles for the forehead and dimples.