Game system, image drawing method for game system, and computer-readable storage medium storing game program

摘要

A game system (16) projectively transforms a plurality of polygons (50), which form three-dimensional object located in an imaginary three-dimensional space, to a viewpoint coordinate system to draw the polygons on a projection plane. The game system includes a polygon drawing unit (1, 4) for drawing a polygon (50) with a first texture (51) which affects drawing of other texture; a second texture drawing unit (1, 4) for drawing a second texture (60), prepared in advance, on the polygon drawn by the polygon drawing unit based on two-dimensional coordinates of the second texture; and a texture moving unit (1, 4) for simulatively moving the second texture, drawn by the second texture drawing unit, on the polygon drawn by the polygon drawing unit by varying the two-dimensional coordinates in time-series.