![]() In parametric modeling, unlike in Blender, one builds geometry through utilizing constraints and measurements which in a nested approach build the model. Those tools are essencial to build and think through a product design without the need to rebuild geometry. This might look like a limitation, which it is, however in addition 123D features a fully working parametric design tree system, with an assembly option, and perfectly working snap, grid and geometry constraints. This also enables Autodesk to offer this product for free. Stress-tests or thermal tools are of course not included. This means while you have all basic standard geometry creation tools such as extrude, loft, fillet shell, and others, finer control about details such as radial fillets etc. However instead of serving the needs for engineers and designers alike, 123D is cut down tool-set wise to what builders and modelers only need. It is based on AutoDesk's famous Inventor application. Interior Designers and Architects have SketchUp, product designers and builders now can use AutoDesk's 123D.
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