Patent ID: 7142212

Claim:
A computer-usable program embodied on an information storage medium, in which information for controlling an image generation system which generates a three-dimensional image of an object formed by a primitive surface is stored, the program comprising information necessary for implementing: hit check processing means for determining whether an object has been hit in sequence; impact computation means which computes an impact position at which an impact is imparted to the object hit in sequence in real-time; distortion computation means which performs computations for each impact to the object for causing distortion of the primitive surface in a vicinity of the impact position at which each impact is imparted to the object in sequence in real-time; and image generation means which generates an image of the object formed by the primitive surface that has been distorted after the each impact was imparted to the object, wherein the distortion computation means comprises: means which computes at least one distortion point for specifying a three-dimensional shape of the primitive surface that is distorted by the impact, the at least one distortion point corresponding to the impact point; and point-to-be-moved determination means which determines at least one of surface-specifying points determined by a distance from the impact point to be moved to the computed distortion point, the surface-specifying points being distributed over the surface of the object or in a vicinity of the object for defining the primitive surface that forms the object.