3D Curve tips and techniques

The table below lists some of the more common methods of constructing curve geometry in a 3D CAD system. Our emphasis here is to provide tips for curve construction that can ultimately affect their usage in a solid model. The following list of tips are keyed to their applicable curve technique in the table.

3D Curve Tips

1. Curve endpoints that are required to connect should always remain coincident.
2. Concatenated (joined) curves should not deviate from their disjointed curve paths. Look for deviations close to their joined endpoints.
3. Local curve modifications should not unknowingly affect associated curves and surfaces.
4. Be aware that some curves are approximations such as those generated from the intersection of two surfaces or the result of a curve projected onto a surface.
5. It is preferred that curves be generated from existing curves and surface boundaries whenever possible.
6. Reference curves not used in construction should be kept on a separate layer.
7. Techniques that maintain curvature and tangency with other curves are recommended.
8. Large offset distances of fluctuating curvatures can produce unexpected results.
9. Only curve deviations within specified geometry tolerances are acceptable.

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