Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Patent
1995-09-28
1998-06-16
Jankus, Almis R.
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
G06T 1500
Patent
active
057678596
ABSTRACT:
A hardware graphics accelerator accepts lists of polygon vertices from an application environment running application and systems graphics software. After a polygon is rotated and translated as needed, it is checked for trivial accept/reject against the clip limits of the viewing volume, but is not otherwise clipped. Polygons that are not rejected are decomposed into triangles before any other operations on them are performed. After decomposition the triangles are illuminated by light sources, if desired and then clipped by a triangle clipper, rasterized, and the results sent to a frame buffer for display. The triangle clipper incorporates trivial accept/reject operation, and is capable of operating on non-planar quadrilaterals. It avoids ugly artifacts during certain clip operations when the diagonal used to decompose a quadrilateral into triangles intersects a clip plane not parallel to the viewing axis. It does this by replacing the point of intersection along that diagonal that the clipper would ordinarily find with a point that is the projection of that diagonal onto a line between two adjacent points of intersection of the actual edges of the quadrilateral with the clip plane.
REFERENCES:
patent: 4646251 (1987-02-01), Hayes et al.
patent: 5307450 (1994-04-01), Grossman
Krech, Jr. Alan S.
Rossin Theodore G.
Hewlett--Packard Company
Jankus Almis R.
Miller Edward L.
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