Rendering self-overlapping objects using a scanline process

Details Rendering self-overlapping objects using a scanline process Rendering self-overlapping objects using a scanline process

1995-08-31

2000-07-04

Jankus, Almis R.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06T 1100

Patent

active

060845961

ABSTRACT:
A method of dealing with self-overlapping objects in a system for creating computerised images, which are made up of objects, by means of a scan line process is described. For each of the overlapping objects (1,2), a number of steps are performed. A first step (702) is to determine a directional border of the object (1). Another step (704) involves determining intersections of the directional border (8 to 10) with a current scan line (7). A further step is to determine, for each pixel within the scan line (7), a count of the number of preceding intersections, wherein the count is incremented for a directional border (8,9) crossing in a first direction and is decremented for a directional border crossing (10,11) in a second direction. Still, a further step (706) is to render each pixel of the object (1) a number of times equal to the count.

REFERENCES:
patent: 5428744 (1995-06-01), Webb et al.
patent: 5493640 (1996-02-01), Itoh et al.

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