Patent
1993-09-28
1994-04-26
Zimmerman, Mark K.
395130, G06F 1572
Patent
active
053074505
ABSTRACT:
A graphical display system and a method for Z-subdivision of polygons into quadrilaterals and triangles whose vertices are arranged between two adjacent Z planes. This slicing allows both atmospheric and texture parameters to be interpolated linearly with minimal error within each quadrilateral or triangle slice. Object data from a host computer is processed by four pipelined graphics subsystems before being displayed on a display screen. Each object is decomposed into a set of primitives. Each primitive may intersect one or more Z planes thereby producing a set of component portions of the primitive. Once a primitive is sliced into component portions, a texture is mapped onto each component portion by interpolating texture parameters to points on or within the component portion. Finally, the textured component portions are rendered on a display device thereby creating a seamless complete object.
REFERENCES:
patent: 3816726 (1974-06-01), Sutherland
patent: 4930092 (1990-05-01), Reilly
patent: 4974176 (1990-11-01), Buchner et al.
patent: 5113490 (1992-05-01), Winget
--Heckbert, Paul S., "Survey of Texture Mapping", Graphics Interface '86/Vision Interface '86, pp. 207-212 (1986).
--Williams, Lance, "Pyramidal Parametrics", Computer Graphics, vol. 17, No. 3, pp. 1-11, (Jul. 1983).
Silicon Graphics Inc.
Zimmerman Mark K.
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