US PATENT SUBCLASS 345 / 422
.~.~.~ Z buffer (depth buffer)

Current as of: June, 1999
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345 /   HD   COMPUTER GRAPHICS PROCESSING, OPERATOR INTERFACE PROCESSING, AND SELECTIVE VISUAL DISPLAY SYSTEMS

418  DF  COMPUTER GRAPHICS PROCESSING {9}
419  DF  .~ Three-dimension {7}
421  DF  .~.~ Hidden line/surface determining {1}
422.~.~.~ Z buffer (depth buffer)

DEFINITION

Classification: 345/422

Z buffer (depth buffer):

(under subclass 421) Subject matter wherein a memory having locations corresponding to display locations stores distance information* which is used to determine which objects or portions of objects are hidden.