Graphic processing apparatus, graphic processing method, graphic processing program, and program storage medium
Appropriate shadowing processing is performed even if coordinate conversion calculation values of polygons have errors. A calculation section 5 performs hidden surface removal processing on normal polygons based on visual-point coordinates and depth values from a visual-point coordinate conversion p...
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| Main Author | |
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| Format | Patent |
| Language | English |
| Published |
16.09.2004
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| Online Access | Get full text |
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| Summary: | Appropriate shadowing processing is performed even if coordinate conversion calculation values of polygons have errors. A calculation section
5
performs hidden surface removal processing on normal polygons based on visual-point coordinates and depth values from a visual-point coordinate conversion processing unit
1
, and updates a pixel memory
6
and a Z-buffer memory
7
. Further, based on a comparison result of obtained depth values of each polygon and Z values stored in the Z-buffer memory
7
, shadowing is performed only on a coordinate region positioned in front of back-facing shadow polygons and behind front-facing shadow polygons when seen from a visual point, and the pixel memory
6
is updated. As a result, even if coordinate conversion calculation values in graphic data on polygons have errors, an edge portion of the shadow polygons which is not intended to be shadowed is not shadowed. |
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