2011

Table Of Contents
extrusion and use various sweeping operations to create solids from 2D curves
and lines.
Surface Modeling
A surface model is a thin shell that does not have mass or volume. AutoCAD
offers two types of surfaces: procedural and NURBS. Use prodecural surfaces
to take advantage of associative modling, and use NURBS surfaces to take
advantage of sculpting with control vertices.
A typical modeling workflow is to create a basic model using mesh, solids,
and procedural surfaces, and then convert them to NURBS surfaces. This allows
you to utilize not only the unique tools and primitive shapes offered by solids
and meshes, but also the shaping capabilities provided by surfaces - associative
modeling and NURBS modeling.
You create surface models using some of the same tools that you use for solid
models: sweeping, lofting, extruding, and revolving. You can also create
surfaces by blending, patching, offsetting, filleting, and extending other
surfaces.
442 | Chapter 22 Create 3D Models