Method and apparatus for shading images

Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...

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340723, 340728, 340747, 395140, G09G 128

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050633759

ABSTRACT:
The present invention provides unique methods and apparatus for shading curves, polygons and patches, implementing Phong, Gouraud and other shading techniques in the rendering of images on a cathode ray tube or other display device. The present invention also includes a unique method and apparatus for shading patches by rendering a series of adjacent curves such that no pixel gaps exist between each rendered curve.

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Gary Bishop; "Fast Phong Shading"; AT&T Bell Laboratories; ACM 0-89791-196-2/86/008/0103; Aug./1986; vol. 20; pp. 103-105.
Fujimoto et al.; "JAG Free Images on a Raster CRT"; Graphics Computer Corporation; pp. 1-15, 1983.
Foley et al.; "Fundamentals of Interactive Computer Graphics"; 1981; Chapter 13, Section 13.5 & 13.6; and Chapter 16, 1982.
Henri Gouraud; "Continous Shading of Curved Surfaces"; IEEE Transactions on Computers, Jun. 1971; pp. 302-308.
Bui Tuong Phong; "Illumination for Computer-Generated Images"; UTEC-CS-73-129; Jul.-1973.
Tom Duff; "Smoothly Shaded Renderings of Polyhedral Objects on Raster Displays"; Computer Graphics Laboratory, 1979 ACM0-89791-004-4/79/0800-270, pp. 270-275.
Steven A. Coons; "Surfaces for Computer-Aided Design of Space Forms"; MIT project MAC; Jun. 1969; Section V.

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