![]() “The beauty of feature-based parametric modeling was that engineers could create solid models with an ordered list of understandable modeling features like sketch, extrude, fillet, and shell. “Parametric modeling made solid modeling practical for the first time and was a huge time saver,” says Jon Hirschtick, chief executive officer at OnShape, a CAD software company. Last year, parametric modeling turned thirty. To get to parametric modeling and to the newer direct modeling, CAD has undergone such radical changes as to make the early systems look unrecognizable to today’s engineers.
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