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Prerequisites: Interface, Regions, Ref. Geometry, Align, Mesh Processing  

Download files: Autosurface

The two main approaches to creating a CAD object from scan data are parametric modeling and surfacing. Parametric modeling involves creating sketches and features and is similar to modeling in most CAD software packages, but the mesh is used as a reference for extracting geometry. The surfacing workflow involves creating 3D curves and patches so that a NURBS surface can be fit to the mesh. Depending on what the user’s end goal is, either approach can be utilized. 

Note that taking the parametric modeling approach does not require as much mesh processing as the surfacing approach. If sketches and features are created manually, then the user can ignore holes in the mesh and/or other problematic data. Cleaning and repairing the mesh is much more important for the surface workflow as the surface can only be as good as the underlying mesh.