Rendering objects

Details Rendering objects Rendering objects

2006-09-19

2006-09-19

Tung, Kee M. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S441000, C345S470000, C345S592000, C345S629000, C382S199000

Reexamination Certificate

active

07110003

ABSTRACT:
The method600renders a self-overlapping polygon, wherein the polygon is a set of one or more closed curves each comprising line segments. The method performs, for a currently scanned pixel that overlaps both sides of a line segment of the self-overlapping polygon within a currently scanned scanline, the following steps. The method600decomposes618that portion of the polygon that lies within the currently scanned pixel into a number of closed loops comprising at least those portions of those line segments that lie within the currently scanned pixel, the closed loops are such that when they are combined the combination is substantially equivalent to that portion of the polygon that lies within the currently scanned pixel. The method600combines623incrementally the closed loops and determines one or more winding count values representative of respective weighted averages of winding counts of the combined closed loops. The method600then determines622a real opacity of the currently scanned pixel according to a predetermined fill rule utilizing an intrinsic opacity of said polygon and the one or more winding count values. The method600finally renders624the currently scanned pixel with the determined real opacity.

REFERENCES:
patent: 5043711 (1991-08-01), Harrington
patent: 5065342 (1991-11-01), Ito et al.
patent: 5438656 (1995-08-01), Valdes et al.
patent: 6084596 (2000-07-01), Politis
patent: 6437793 (2002-08-01), Kaasila
Porter, Thomas, Tom Duff, Compositing Digital Images, Jul. 1984, vol. 18, No. 3, pp. 253-259.

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