Boots – shoes – and leggings
Patent
1986-07-07
1989-07-11
Harkcom, Gary V.
Boots, shoes, and leggings
340729, G06F 1572
Patent
active
048477893
ABSTRACT:
A method for removing hidden lines in a two-dimensional surface chart disclosing an image of a three-dimensional surface, includes storing the X, Y and Z co-ordinates of selected points (A, B, C, D, E) of the surface as a first matrix, transforming the first matrix into a second matrix indicating the drawing sequence through the selected points, rotating the points of the second matrix around the Z-axis a first angle .alpha., rotating the second matrix points a second angle .beta. and drawing the two-dimensional surface chart in accordance with the indicated sequence using the X and Y co-ordinate values of the rotated points. The drawing sequence comprises a drawing operation of X-traces, an X-trace being defined as a line passing through points having substantially the same Y values in the first matrix, the drawing operation of one X-trace being followed by a plurality of .DELTA. Y -trace drawing operations between the last drawn X-trace and the next to be drawn X-trace, an Y-trace being defined as a line passing through points having substantially the same X values in the first matrix and a .DELTA.Y-trace being defined as the part of an Y-trace falling between two adjacent X-traces, said sequential drawing operation proceeding in sequence from low Y value X-traces toward high value X-traces. No lines are drawn inside a forbidden area being defined as an area surrounded by an upper horizon and a lower horizon.
REFERENCES:
patent: 3671729 (1972-06-01), Lux
patent: 4181953 (1980-01-01), Osofsky
patent: 4222048 (1980-09-01), Johnson
patent: 4412296 (1983-10-01), Taylor
patent: 4583185 (1986-04-01), Heartz
patent: 4594673 (1986-06-01), Holly
patent: 4623880 (1986-11-01), Bresenham et al.
H. Williamson, "Algorithm 420 Hidden-Line Plotting Program [J6]" Communication of the ACML, Feb. 1972, vol. 15, No. 2, pp. 100-103.
A. Fujimoto et al., "A 3-D Graphics Display System With Depth Buffer and Pipeline Processor", IEEE Computer Graphics Application, vol. 4, No. 6, Jun. 1984, pp. 11-23.
A. Appel et al., "Haloed Line Effect", IBM Technical Disclosure Bulletin, vol. 21, No. 4, Sep. 1987, pp. 1715-1716.
Kelly Robert E.
Welch Peter D.
Arnold Jack M.
Harkcom Gary V.
International Business Machines - Corporation
Zimmerman Mark K.
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