| 摘要 |
PROBLEM TO BE SOLVED: To obtain a natural image with no degradation in picture quality. SOLUTION: First of all, in a step S1, it is judged whether a polygon is a three-dimensional (3D) polygon sharing the picture elements of boundary with the adjacent polygon or a two-dimensional (2D) sprite not sharing the picture elements of boundary with the adjacent polygon. When this polygon is judged as the 3D polygon or the 2D sprite, a step S2 or S3 is started and plotting rules are respectively set to shared apex plotting rules or independent apex plotting rules. Then, a step S4 is started and according to these set plotting rules, the polygon is plotted. Namely, based on the shared apex plotting rules, picture elements on the right side and downside of boundary of the polygon are not plotted but based on the independent plotting rules, all the picture elements at the boundary of polygons are plotted. |
