Method and apparatus for determining visibility of a pixel

Details Method and apparatus for determining visibility of a pixel Method and apparatus for determining visibility of a pixel

1997-07-14

1999-11-02

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

345421, G06T 1540

Patent

active

059779802

ABSTRACT:
A method and apparatus for determining visibility of determining a pixel during video rendering is accomplished by determining z-positioning information of an object element. The z-positioning information is representative of the z-information of an object element in a particular section of the display. For example, the z-positioning information may be the two most significant bits of the z-parameter, or information, of an object element. Having determined the z positioning information, a comparison is made between the z positioning information of the object element and z positioning information stored in temporary memory. If this is the first object element being rendered, the z positioning information stored in the temporary memory will be initial z positioning information. When the comparison is favorable, i.e., the object element is in the foreground with respect to the z positioning information stored in the temporary memory, the temporary memory is updated with the z positioning information of the object element. In addition, a z buffer, or z memory, is updated with the z information of the object element.

REFERENCES:
patent: 4855938 (1989-08-01), Gonzalez-Lopez et al.
patent: 5268995 (1993-12-01), Diefendorff et al.
patent: 5734806 (1998-03-01), Narayanaswami
patent: 5819017 (1998-06-01), Akeley et al.

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