Image synthesis apparatus and image synthesis method
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United States of America Patent
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Mar 14, 2000
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N/A
app pub date -
Sep 26, 1996
filing date -
Nov 30, 1994
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Abstract
Drawing 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 M.times.N regions, each formed of K.times.L 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.gtoreq.ZMAXR, and the process of drawing is performed for the polygon without referencing depth information stored in the main Z-buffer when ZMAX.ltoreq.ZMINR.
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