Method and apparatus for clearing a region of Z-buffer

Details Method and apparatus for clearing a region of Z-buffer Method and apparatus for clearing a region of Z-buffer

1990-11-16

1991-08-06

Harkcom, Gary V.

Boots, shoes, and leggings

364522, 340799, 340729, G06F 1206, G06F 1572, G09G 536, G09G 102

Patent

active

050382977

ABSTRACT:
A method and apparatus for clearing a Z-buffer in a raster scanned, computer controlled video display system having a frame buffer and a Z-buffer is disclosed. The method includes the step of writing a plurality of bits into pixel locations of the frame buffer, which pixel locations will be cleared in the Z-buffer and on the screen of the video display. Those plurality of bits invalidating the Z values in the Z-buffer corresponding to those pixel locations.

REFERENCES:
patent: 4016544 (1977-04-01), Morita et al.
patent: 4609917 (1986-09-01), Shen
patent: 4689677 (1987-08-01), Hedley et al.
patent: 4701863 (1987-10-01), Bruce
patent: 4725987 (1988-02-01), Cates
patent: 4924415 (1990-05-01), Winser
patent: 4951232 (1990-08-01), Hannah
patent: 4961153 (1990-10-01), Fredrickson et al.

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