Interactive graphic input system

Details Interactive graphic input system Interactive graphic input system

1993-02-24

1995-02-07

Herndon, Heather R.

395120, G06F 1562

Patent

active

053881990

ABSTRACT:
In the conventional CAD or CAM system, when a shape must be defined, it should use mathematical models which are formed by B-Reps or CSG method. B-Reps method is more complicated than CSG in data structure and in processing. This invention attempts to utilize merits of the CSG method, express component elements of a three-dimensional solid model in a hierarchical structure so that an element of a a higher order can relocate another element of a lower order on its coordinate system, and an interactive operation can be employed in defining. This method allows an operator to ascertain the progress of the works with his/her own eyes to greatly simplify the works of shape defining of solid models.

REFERENCES:
patent: 4618924 (1986-10-01), Hinds
patent: 4641270 (1987-02-01), Lalloz et al.
patent: 4649498 (1987-03-01), Kedem et al.
patent: 4736306 (1988-04-01), Christensen et al.
patent: 4739488 (1988-04-01), Asakura
"What to Look For in a CAD/CAM System", Hanson et al., Jun. 1986, 47-50.

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