Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1992-10-23
1994-12-06
Chin, Tommy P.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
395135, G09G 500
Patent
active
053715144
ABSTRACT:
A multiple-pass system for determining the primitives that are visible in a predetermined pick aperture for a "visible pick" operation. On the first pass, the primitives contained within the pick aperture and thus potentially visible are selected, and each selected primitive is assigned a pick index as an identifier. On the second pass, the pick indices of the selected primitives are rendered to a temporary frame buffer area, using a Z-buffer for hidden surface removal so that only the pick indices of the primitives visible within the pick aperture are stored in the corresponding frame buffer portion. On the third pass, the frame buffer portion corresponding to the pick aperture is read to determine the pick indices of the visible primitives. This information is then used to report back to the host the picked primitives.
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"Hidden Line/Hidden Surface Removal (HLHSR)", The graPHIGS Programming Interface Understanding Concepts, pp. 14-14-16-14.
Lawless John J.
Li David W.
Tannenbaum David C.
Au A
Chin Tommy P.
International Business Machines - Corporation
Kinnaman Jr. William A.
Walker Mark S.
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