Design World publishes a paper by PTC’s VP of Product Management, Brian Thompson, on the features and benefits of parametric and direct modeling CAD solutions:
There are a few differences between parametric and direct modeling. The parametric paradigm provides an “engineer it” approach to design which requires you to anticipate and define feature constraints, relations, and dependencies to ensure that any design modification will update all related downstream geometry in a predefined way.
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Direct modeling, on the other hand, provides a “just do it” modeling strategy that gives you the power to quickly define and capture geometry. You focus on creating geometry rather than building features, constraints, and design intent into your models.
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