Method for visibility culling

Details Method for visibility culling Method for visibility culling

1997-12-31

2000-01-25

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

G06F 1500

Patent

active

060183489

ABSTRACT:
A method is disclosed for determining whether a distant 3-dimensional object is completely obstructed from view by a closer 3-dimensional object. The method includes determining which of the two 3-dimensional objects is farther from a viewer. For the object farther away, determining that object's smallest bounding sphere, and projecting that sphere onto the view plane of the observer. For the object closer to the observer, determining that object's largest bounded sphere, and projecting that sphere onto the view plane. The two projections are then compared. If the near-object projection completely contains the far-object projection, then the distant object is completely obscured from view by the closer object. If completely obscured from view, the distant object is discarded; otherwise, the distant object is rendered in the normal manner.

REFERENCES:
patent: 4694404 (1987-09-01), Meagher
patent: 5602564 (1997-02-01), Iwamura et al.

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