Method for displaying edging or decaling of an object in a graph

Details Method for displaying edging or decaling of an object in a graph Method for displaying edging or decaling of an object in a graph

1993-10-26

1995-05-16

Jankus, Almis

395119, 395121, 395135, G06T 1510

Patent

active

054168937

ABSTRACT:
A system for implementing polygon edging of objects in a graphics display. In a first pass, the system renders the polygon fill with z-buffer comparison and replace enabled, however, for each pixel written to the display frame buffer and z-buffer, an edging plane bit for the pixel is set. A second pass renders the polygon edges with z-buffer comparison and z-buffer replace enabled and uses the edging plane bit as a virgin bit. A third pass re-renders the polygon fill, but only resets the edging plane bit for each pixel. The system may also use a virgin bit available in the z-buffer as the edging plane bit.

REFERENCES:
patent: 4808988 (1989-02-01), Burke et al.
patent: 5123085 (1992-06-01), Wells et al.
Akeley, Kurt, "The Hidden Charms of Z-Buffer", IRIS Universe, Issue No. 11.

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