| 摘要 |
<p>PCT No. PCT/JP95/02443 Sec. 371 Date Sep. 26, 1996 Sec. 102(e) Date Sep. 26, 1996 PCT Filed Nov. 30, 1995 PCT Pub. No. WO96/17325 PCT Pub. Date Jun. 6, 1996Drawing processing uses a main Z-buffer in which is stored depth information that expresses distance from a viewpoint, corresponding to each of pixels on a display screen. The main Z-buffer is divided into MxN regions, each formed of KxL pixels. A ZR-buffer stores a minimum value ZMINR and a maximum value ZMAXR of the depth information for the pixels within each of the regions. The minimum value of depth information for a polygon is ZMIN, and the maximum value thereof is ZMAX. The process of referencing depth information stored in the main Z-buffer and the process of drawing the polygon are omitted when ZMIN>/=ZMAXR, and the process of drawing is performed for the polygon without referencing depth information stored in the main Z-buffer when ZMAX</=ZMINR.</p> |
