Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1992-11-03
1995-01-24
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345157, 395119, G09G 106
Patent
active
053845803
ABSTRACT:
A calculator calculates projection coordinates of principal vertexes of a displayed object with respect to a projection plane from a visual point. An evaluation device evaluates whether surfaces of the object which are determined by the principal vertexes are visible or invisible from the visual point. A result of the evaluating by the evaluation device is indicated. A memory stores information of a position of a predetermined virtual operation plane. A pointing device is movable on an actual operation plane. A calculator connected to the memory and the pointing device calculates a correspondence point on the virtual operation plane which corresponds to a position of the pointing device when the pointing device moves on the actual operation plane. A calculator calculates a half line which starts from the correspondence point and which intersects with the virtual operation plane at a predetermined angle. A setting device sets the predetermined angle. A calculator calculates a point of an intersection between the half line and the displayed object. A calculator calculates projection coordinates of at least part of the half line with respect to the projection plane. The calculated projection coordinates of at least part of the half line are indicated.
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patent: 4745405 (1988-05-01), Himelstein et al.
patent: 4808979 (1989-02-01), Deltoff et al.
patent: 4812829 (1989-03-01), Ebina et al.
patent: 4835528 (1989-05-01), Flinchbaugh
Sutherland, I. E., "A head-mounted three dimensional display", Fall Joint Computer Conference, 1968, pp. 757-763.
Matsushita Electric - Industrial Co., Ltd.
Weldon Ulysses
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