Boots – shoes – and leggings
Patent
1987-10-26
1992-01-28
Harkcom, Gary V.
Boots, shoes, and leggings
364521, 340729, 340750, 395143, G06F 314
Patent
active
050848305
ABSTRACT:
A memory device having a plurality of addressable memory locations, each of which can be defined uniquely by an address word having an X component and a Y component, which memory locations correspond respectively to grid points in a rectangular array at a pitch dX in the X direction and a pitch dY in the Y direction, is loaded with data values Q. In a first operating cycle, a first address word defining a memory location corresponding to a first grid point is generated. In a second cycle, a first value of Q as a function of X and Y is computed, and concurrently a second address word defining a memory location corresponding to a second grid point is generated. In a third cycle, the first value of Q is compared with a previous value of Q for the first grid point, and concurrently a third address word defining a memory location corresponding to a third grid point is generated and a second value of Q is computed. In a fourth cycle, the first value of Q is loaded into the memory location corresponding to the first grid point if that first value of Q bears a predetermined relationship to the previous value of Q.
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Sutherland et al., "A Characterization of Ten Hidden-Surface Algorithms", Spring COMPCON 79, pp. 293-347.
Dalrymple John C.
Doornink Douglas J.
Gray Francis I.
Harkcom Gary V.
Nguyen Phu K.
Smith-Hill John
Tektronix Inc.
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