Method and system for solid modelling

Details Method and system for solid modelling Method and system for solid modelling

1987-08-18

1989-08-15

Paschall, M. H.

Boots, shoes, and leggings

340723, 358 22, G06F 15626

Patent

active

048581496

ABSTRACT:
A method of generating a spatial representation of a 3-D solid object, which includes component shapes, which can be defined by transforming constructive solid geometry primitives includes the steps of, setting up a structure, to define the object in terms of the primitives and transforms setting up a definition of a 3-D box in a world space and then sub-dividing the box into sub-boxes, generating test-cells in object space by performing on the sub-boxes the inverse of each transformation to be performed on the primitives to create the object and determining which of the test-cells intersect the object. Thus, the need to transform the object primitives is avoided. A particular application of the method is the generation of 2-D images of a 3-D solid object.

REFERENCES:
patent: 4396988 (1983-08-01), Fitzgerald, Jr.
patent: 4463372 (1984-07-01), Bennett et al.
patent: 4472732 (1984-09-01), Bennett et al.
patent: 4615013 (1986-09-01), Yan et al.
patent: 4625289 (1986-11-01), Rockwood
patent: 4737921 (1982-04-01), Goldwasser et al.
"Reducing the Effect of Complexity on Volumn Model Evaluation", Computer Design, vol. 14, No. 2, Woodwark & Quinlan.
"Global and Local Deformations of Solid Primitives", Computer Graphics, vol. 18, No. 3, Jul. 1984, Alan Barr.

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