Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Patent
1996-11-20
1999-05-04
Nguyen, Phu K.
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
G06F 1500
Patent
active
059008814
ABSTRACT:
A computer graphics circuit for rendering light-reflected images based on a bump-mapped Phong-shading model implemented fully in hardware, comprises a span processor, a bump-mapping circuit, a reverse-projection circuit, a bump-normal RAM, and Phong-shading circuit. The surface and bump normal of each polygon is defined by horizontal and vertical angles relative to the eye-point axis in device coordinates and to an axis perpendicular to a texture mapping coordinate, respectively. The trigonometric function tables used for rotation and shading computation have an angle-range around either a horizontal or vertical angle. The surface normal of horizontal and vertical angles is rotated by the bump normal and given rotated horizontal and vertical angles to the shading circuit. The shading circuit further comprises and accumulator for multiple light-sources and spot-lighting, which has no limitation of the number of light-sources. The bump-mapped shading circuit is combined with a rotation-matrix multiplier and a shading circuit using trigonometric function tables of angle variables.
REFERENCES:
patent: 4808988 (1989-02-01), Burke et al.
patent: 4899295 (1990-02-01), Nonweiler
patent: 4974177 (1990-11-01), Nishiguchi
patent: 5214753 (1993-05-01), Lee et al.
patent: 5255352 (1993-10-01), Falk
"Faster Phong Shading Via Angular Interpolation" by A.A.M. Kuijk and E.H. Blake, pp. 315-325, 1989.
"Hardware Supported Bump Mapping: A Step Towards Higher Quality Real-Time Rendering" by I.Ernst, D.Jackel, H.Russeler and O.Wittig, pp. 63-70, 1996.
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