Patent
1994-09-14
1997-09-30
Feild, Joseph H.
G06T 1550
Patent
active
056733755
ABSTRACT:
With employment of a pointing device equipped with at least one switch, and connected to a computer, both of a drawing position of a figure to be drawn on a display plane, and a size of this figure are designated. Another designation is made of a height of a predetermined region within the figure to be drawn, measured from edge portions of this figure to be drawn, along the vertical direction with respect to this display plane by employing the above-described pointing device. A further designation is made of a direction of light illuminated to the figure to be drawn by using the above-mentioned pointing device. Based upon the designated height and light direction, brightness of each of regions subdivided from this figure to be drawn is calculated, and each of the subdivided regions is displayed at the calculated brightness, so that this figure is three-dimensionally displayed on the display plane.
REFERENCES:
patent: 4901064 (1990-02-01), Deering
patent: 5083287 (1992-01-01), Obata et al.
patent: 5278949 (1994-01-01), Thayer
patent: 5317678 (1994-05-01), Okawara et al.
patent: 5463723 (1995-10-01), Saha
patent: 5485556 (1996-01-01), Takagi et al.
"Macdraw-II," Claris Co., Ltd., Section 2, pp. 22-37.
"Nikkei Computer Graphics," Jul. 1992, pp. 91-103.
Feild Joseph H.
Hitachi , Ltd.
Vo Cliff N.
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