| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an image generation system and an information storage medium capable of solving the errors of implicit surface elimination in a Z buffer method with small processing burdens. SOLUTION: In the case that polygons PL1 and PL2 after a geometry processing are provided with the same Z value, a Z shift value is added/ subtracted to/from the Z value of at least one of the polygons. Thus, a display error (the error of the implicit surface elimination) generated in the case that the same polygon is divided into the triangular polygons (plotting unit of a plotting part) of different shapes (vertexes) is prevented. The Z value larger than the arithmetic error of an interpolation processing (DDA) is added/ subtracted. Whether or not to add/subtract the Z shift value to/from the Z value is judged corresponding to identification information relating to the polygons and the set and the size of the Z value. The Z shift value to be added/ subtracted to/from the Z value is changed corresponding to the size of the Z value.</p> |
