GAME SYSTEM AND INFORMATION MEMORY MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a game system and an information memory medium which minimize processing load in the generation of an image of an object presented by a free curved surface and a free curve. SOLUTION: A coefficient matrix (base matrix) of a mixing function of NURBS as a non-uniform curved surface is prepared at a stage prior to the processing of determining points on the NURBS. The points on the NURBS are determined based on a differential set obtained from the resulting coefficient set and a control point. The coefficient matrix is prepared by computing the coefficient matrix of the mixing function expressed by a polynomial in which a recurrence formula in a recurrent expression is developed based on a NOT vector or reading it from an information memory medium (network). The points are determined by an addition processing of the differential set. The coefficient matrix is prepared at the pre-processing of an affine transformation performed on a frame basis. A NURBS object data containing the coefficient matrix and the control point is prepared and the coefficient matrix and the control point are read out correspondingly to a curved surface batch to be processed.