Patent ID: 6971957

Claim:
A game system for displaying a shadow of an object in a three-dimensional game space by using a shadow volume, the game system comprising: an attitude changing processing mechanism for changing an attitude of the object; first shadow volume data storage locations having stored therein first shadow volume data corresponding to a first attitude of the object; second shadow volume data storage locations having stored therein second volume data corresponding to a second attitude of the object which is different from the first attitude; a shadow volume setting processing mechanism for setting the shadow volume based on the first shadow volume data when the attitude of the object, which is changed by the attitude changing mechanism, at a certain point in time corresponds with the first attitude and for setting the shadow volume based on the second shadow volume data when the attitude of the object at the certain point in time corresponds with the second attitude; and a shadow drawing processing mechanism for drawing a shadow of the object at the certain point in time based on the shadow volume set by the shadow volume setting processing mechanism.