System and method for accelerated occlusion culling

Details System and method for accelerated occlusion culling System and method for accelerated occlusion culling

1996-07-26

1998-05-12

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

G06T 1540

Patent

active

057512914

ABSTRACT:
An occlusion culling circuit for use in a graphics computer receives graphics primitives data including x and y coordinates for each pixel, a z depth value, and r, g, b, and a or index color data. For each group of primitives, the graphics computer scans the primitive and determines a volume which completely bounds the primitive. The z depth values for the pixels comprising the bounding volume are then compared by the occlusion culling circuit to the depths of the pixels in the already rendered primitives to determine whether any pixels in the incoming primitive are visible. If no pixels are visible, the occlusion culling circuit clears the result register and receives the next graphics primitive. If, on the other hand, one or more pixels is visible, the occlusion culling circuit completely renders the primitives bounded by the bounding volume. Since the graphics primitives which are totally occluded can bypass the more intensive pixel by pixel processing and storage, the speed and efficiency of the graphics computer can be significantly increased.

REFERENCES:
patent: 5245700 (1993-09-01), Fossum
patent: 5542025 (1996-07-01), Brown
patent: 5557711 (1996-09-01), Malzbender
patent: 5561750 (1996-10-01), Lentz
patent: 5583974 (1996-12-01), Winner et al.
patent: 5590249 (1996-12-01), Hanaoka
patent: 5613050 (1997-03-01), Hochmuth et al.

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