Polygon renderer which determines the coordinates of polygon edg

Details Polygon renderer which determines the coordinates of polygon edg Polygon renderer which determines the coordinates of polygon edg

1991-03-12

1994-01-11

Harkcom, Gary V.

395119, 395120, 395132, G06F 1562

Patent

active

052789497

ABSTRACT:
A polygon rendering circuit for a computer color graphics system comprising an edge stepper which steps along edges of an input polygon to determine the span of the polygon along each scan line intersected by the polygon. The coordinate values of the edges on each scan line are determined to sub-pixel resolution such that only those pixels whose centers lie within the true polygon edges (within the span width) must be drawn. Processing efficiency is improved and bandwidth is minimized by passing only those edges of the polygon which are new to that polygon and by computing the Z values in the same manner as, and in parallel with, the X values. Improved results are also possible in accordance with the technique of the invention, for since adjacent polygons compute the same edge by stepping, there can be no gaps between polygons due to round-off errors.

REFERENCES:
patent: 4737921 (1988-04-01), Goldwasser et al.
patent: 4837447 (1989-06-01), Pierce et al.
patent: 4910683 (1990-03-01), Bishop et al.
patent: 4945500 (1990-07-01), Deering
patent: 5025405 (1991-06-01), Swanson
Paul Haeberli and Kurt Akeley, The Accumulation Buffer: Hardware Support for High-Quality Rendering, Computer Graphics, vol. 24 No. 4, Aug. 1990, pp. 309-313.
R. W. Swanson and L. J. Thayer, "A Fast Shaded-Polygon Renderer", Proceedings of Siggraph '86, Computer Graphics, vol. 20, No. 4 (Aug. 1986), pp. 95-101.
K. Akeley and T. Jermoluk, "High-Performance Polygon Rendering", Computer Graphics, vol. 22, No. 4, Aug. 1988.

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