Typically in the CAD market there are products that create lines, arcs, and circles. Combine these items with dimensions and notes, and out come drawings for civil, architectural, or mechanical design. Because traditional CAD tools are based on geometric objects, making a design change requires changing all appropriate components in order to make the drawing correct.
Most current CAD/CAM/CAE software utilizes a design feature called parametrics, a method of linking dimensions and variables to geometry in such a way that when the values change, the part changes as well. A parameter is a variable to which other variables are related, and these other variables can be obtained by means of parametric equations. In this manner, design modifications and creation of a family of parts can be performed in remarkably quick time compared with the redrawing required by traditional CAD. In the past five years, PTC's success has prompted major CAD players to offer similar functions.
Parametric modification can be accomplished with a spreadsheet, script, or by manually changing dimension text in the digital model.
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