Constraint-Based Computer-Aided Design

[+] Author and Article Information
Christoph M. Hoffmann

Department of Computer Science,  Purdue University, West Lafayette, IN 47907

J. Comput. Inf. Sci. Eng 5(3), 182-187 (May 15, 2005) (6 pages) doi:10.1115/1.1979508 History: Received April 08, 2005; Revised May 15, 2005

Computer-aided design (CAD) systems have become parametric, basing shape design on constraints and design feature operations. We review the development of constraint-based parametric CAD, explaining some of the foundational issues as well as giving an outlook on possible future directions of development.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Nonmanifold solid considered not manufacturable

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Figure 2

Input sketch with constraints to be solved; arc tangencies required but not annotated

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Figure 3

Constraint graph of phase 1; unlabeled edges represent incidences

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Figure 4

Solutions for different constraint values with different topological properties

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Figure 5

Extrusion to-next with uncertain meaning

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Figure 6

Overlapping blends that would create gaps in the solid surface

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Figure 7

Different joins of a fillet and round at a vertex; see Ref. 32

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Figure 8

History dependence can lead to unintuitive edits



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