A game system, program and image generating method for drawing an object viewed
from various angles are provided. The thickness of an outline image of the object
is changed depending on the face shape of the object. The outline image is drawn
with a thicker outline when an angle between a first vector extending from
a point on the face toward the viewpoint and a normal vector changes from the right
angle with a lower decrement, and drawn with a thinner outline line when the angle
changes from the right angle with a higher decrement. The outline image
is drawn in the vicinity of an area defined by 90.
An outline texture specified by a texture coordinate, determined based on the inner
product between the first vector and the normal vector, is mapped on the object.
Another outline image, having constant thickness, is drawn.
