# System for conversion between the boundary representation model and a constructive solid geometry model of an object

## Abstract

A system converts from the boundary representation of an object to the constructive solid geometry representation thereof. The system converts the boundary representation of the object into elemental atomic geometrical units or I-bodies which are in the shape of stock primitives or regularized intersections of stock primitives. These elemental atomic geometrical units are then represented in symbolic form. The symbolic representations of the elemental atomic geometrical units are then assembled heuristically to form a constructive solid geometry representation of the object usable for manufacturing thereof. Artificial intelligence is used to determine the best constructive solid geometry representation from the boundary representation of the object. Heuristic criteria are adapted to the manufacturing environment for which the device is to be utilized. The surface finish, tolerance, and other information associated with each surface of the boundary representation of the object are mapped onto the constructive solid geometry representation of the object to produce an enhanced solid geometry representation, particularly useful for computer-aided manufacture of the object. 19 figs.

- Inventors:

- Issue Date:

- Research Org.:
- Allied Corp., Kansas City, MO (USA). Bendix Kansas City Div.

- OSTI Identifier:
- 5563579

- Application Number:
- ON: DE86013812

- Assignee:
- Dept. of Energy TIC; ERA-11-006823; EDB-86-141613

- DOE Contract Number:
- AC04-76DP00613

- Resource Type:
- Patent

- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; COMPUTER-AIDED DESIGN; RESEARCH PROGRAMS; COMPUTER-AIDED MANUFACTURING; ARTIFICIAL INTELLIGENCE; MANUFACTURING; 990200* - Mathematics & Computers

### Citation Formats

```
Christensen, N.C., Emery, J.D., and Smith, M.L.
```*System for conversion between the boundary representation model and a constructive solid geometry model of an object*. United States: N. p., 1985.
Web.

```
Christensen, N.C., Emery, J.D., & Smith, M.L.
```*System for conversion between the boundary representation model and a constructive solid geometry model of an object*. United States.

```
Christensen, N.C., Emery, J.D., and Smith, M.L. Mon .
"System for conversion between the boundary representation model and a constructive solid geometry model of an object". United States.
```

```
@article{osti_5563579,
```

title = {System for conversion between the boundary representation model and a constructive solid geometry model of an object},

author = {Christensen, N.C. and Emery, J.D. and Smith, M.L.},

abstractNote = {A system converts from the boundary representation of an object to the constructive solid geometry representation thereof. The system converts the boundary representation of the object into elemental atomic geometrical units or I-bodies which are in the shape of stock primitives or regularized intersections of stock primitives. These elemental atomic geometrical units are then represented in symbolic form. The symbolic representations of the elemental atomic geometrical units are then assembled heuristically to form a constructive solid geometry representation of the object usable for manufacturing thereof. Artificial intelligence is used to determine the best constructive solid geometry representation from the boundary representation of the object. Heuristic criteria are adapted to the manufacturing environment for which the device is to be utilized. The surface finish, tolerance, and other information associated with each surface of the boundary representation of the object are mapped onto the constructive solid geometry representation of the object to produce an enhanced solid geometry representation, particularly useful for computer-aided manufacture of the object. 19 figs.},

doi = {},

journal = {},

number = ,

volume = ,

place = {United States},

year = {1985},

month = {4}

}