System and method of creating a three-dimensional solid model fr

Details System and method of creating a three-dimensional solid model fr System and method of creating a three-dimensional solid model fr

1996-02-27

1998-04-28

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

345427, G06T 1720

Patent

active

057451176

ABSTRACT:
A solid model is created from a plurality of incomplete drawings. Line segments or curves on each view are calculated from two-dimensional data of a three-view drawing. A wireframe model is created on the basis of the calculated line segments or curves. The wireframe model is corrected by comparing edges of the created wireframe model and the line segments or curves. The corrected wireframe model is converted into a cell-decomposition model. Conditions establishing the line segments or curves as edges of the cell-decomposition model are set by Boolean expressions. A solid model is synthesized on the basis of combinations of cells which are solutions of the expressions. If no solution exists even if the expressions are solved, candidate models are synthesized on the basis of any combination of cells. The synthesized candidate models are displayed in the descending order of the degree of similarity. Alternatively, if a plurality of combinations of cells which are the solutions do exist, a candidate model selected by the operator is determined to be the solid model.

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"Unique Construction of Polyhedra From Ambiguous Orthographic Views by Pseudo Boolean Nonlinear Programming", M. Takahashi et al, Journal of Japanese Society For Artificial Intelligence, Nov. 1991, Japan, vol. 5, No. 6, ISSN 0912-8085, pp. 904-911.
"Construction of Solid Model by Orthographic View-Case of Polyhedra", K. Itoh, Information Processing Society of Japan, 1990, Japan, vol. 31, No. 8, ISSN 0447-8053, pp. 1095-1106.
"Restoring to a Polyhedron From Three Orthographic Views by Relaxation Matching Method", T. Horiuchi et al, IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (Cat. No. 93CH3288-8), May 1993, ISBN 0-7803-0971-5, 1993, IEEE, USA pp. 626-629, vol. 2, XP002027617.
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