Patent ID: 8441483

Claim:
An image generating device that generates an image in which a predetermined object arranged in a three-dimensional virtual space is synthesized with a concave or convex trace, comprising: an information memory unit that stores trace information containing a normal map for the trace; an original image drawing unit that draws an original image containing the predetermined object arranged in the virtual space; a synthesizing unit that synthesizes the drawn object with the trace to which the normal map is applied; a brightness value calculating unit that calculates a brightness value as a function of a first factor and a second factor, the first factor being a function of a relationship between a normal line of the image at a synthesis position where the drawn object is synthesized and a light source direction, the second factor being a function of a relationship between a normal line of the drawn object, synthesized with the image, through the normal map and the light source direction; and a shading unit that performs shading on an image of the object at the synthesis position based on the calculated brightness value wherein the shading is performed on the drawn object, but not the rest of the image.