Boots – shoes – and leggings
Patent
1987-09-28
1989-08-29
Pellinen, A. D.
Boots, shoes, and leggings
340729, 340742, G09G 106
Patent
active
048623911
ABSTRACT:
A shading circuit has a unit for calculating coordinates and intensities of points inside a polygon based on X, Y, and Z coordinates and intensities of vertexes of each of polygons constituting a solid model. This unit includes a preprocessing section for obtaining the depth change .DELTA.Z/.DELTA.X of Z coordinate for each unit change in X coordinate and the change .DELTA.I/.DELTA.X of intensity for each unit change in X coordinate, based on X, Y, and Z coordinates and intensities of three vertexes of each of triangular polygons constituting a solid model, and a digital differential analyzer until for obtaining Z coordinates and intensities of points inside each polygon commonly using .DELTA.Z/.DELTA.X and .DELTA.I/.DELTA.X when the X and Y coordinates of the points are determined.
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patent: 4278996 (1981-07-01), Netrauali et al.
patent: 4396903 (1983-08-01), Habicht et al.
patent: 4586038 (1986-04-01), Sims et al.
patent: 4727364 (1988-02-01), Vorst
Foley et al., "Fundamentals of Interactive Computer Graphics," Addison-Wesley Publishing Company, Chapter 16 Shading Models 16.4, pp. 582-583.
Kabushiki Kaisha Toshiba
Pellinen A. D.
Wysocki A. Jonathan
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