Three-dimensional geometry processing method and apparatus there

Details Three-dimensional geometry processing method and apparatus there Three-dimensional geometry processing method and apparatus there

1988-01-19

1990-01-09

Lall, Parshotam S.

Boots, shoes, and leggings

364522, 382 25, 382 28, G06F 1520

Patent

active

048932604

ABSTRACT:
Three dimensional solid geometry in an analysis domain is divided into primitives which are three dimensional solid geometry elements such as a parallelepiped, column or globe, and each primitive is divided into scanning lines having a predetermined thickness and being perpendicular to a reference plane of the analysis domain, then run-length which is represented by intersection of the scanning line and the primitive is calculated; the analysis domain is divided into cells, and a volume of the solid geometry which is occupied in each cell is calculated by intergration of the data of the run-lengths in the cell; moreover, a surface area of solid geometry is calculated by integration of intersection domains of the surface of the cell and the run-length, and finally a volume occupation ratio which is a ratio of the volume of the solid geometry and the volume of the cell is calculated, and in a similar manner an area occupation ratio which is a ratio of the surface area of the solid geometry and the surface area of the cell is calculated.

REFERENCES:
patent: 4144576 (1979-03-01), Mutton et al.
patent: 4608709 (1986-08-01), Hedler et al.
patent: 4646354 (1987-02-01), Naito et al.
patent: 4687107 (1987-08-01), Brown et al.
patent: 4707859 (1987-11-01), Nudd et al.
patent: 4730261 (1988-03-01), Smith
patent: 4736306 (1988-04-01), Christensen et al.
patent: 4766556 (1988-08-01), Arakawa

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