Retrieval space determination system for three-dimensionally sha

Details Retrieval space determination system for three-dimensionally sha Retrieval space determination system for three-dimensionally sha

1992-09-29

1995-11-28

Herndon, Heather R.

395119, G06T 1530

Patent

active

054715695

ABSTRACT:
The present invention relates to a retrieval space determination system for three-dimensionally shaped parts in a computer aided design (CAD) system. An input unit inputs coordinates of two points defining one side of a retrieval space displayed on a display screen and inputs the depth of the retrieval spaced based on that side. A file stores three-dimensional shape data. A circumscribing sphere creating unit reads a selected three-dimensionally shaped part from the file storing the three-dimensional shape data and creates a circumscribing sphere for the selected three-dimensional shape part in accordance with the coordinate data of the part. The coordinate conversion unit converts center coordinates of the circumscribing sphere, created by the circumscribing sphere creating unit, into coordinates of the retrieval space input from the input unit. An in/out decision units compares the center coordinates of the circumscribing sphere converted into coordinates of the retrieval space, the radius of the circumscribing sphere, and the coordinates of the sides of the retrieval space and, based on this data, determines whether the circumscribing sphere is completely included within the retrieval space or is only partially included within the retrieval space.

REFERENCES:
patent: 4835722 (1989-05-01), Clarke et al.
patent: 4994989 (1991-02-01), Usami et al.
patent: 5249264 (1993-09-01), Matsumoto

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