2011

Table Of Contents
Geometry That Can Be Used As Profiles and Guide Curves
The curves that you use as profile and guide curves when you extrude, sweep,
loft, and revolve can be:
Open or closed
Planar or non-planar
Solid and surface edge subobjects
A single object (to extrude multiple lines, convert them to a single object
with the JOIN command)
A single region (to extrude multiple regions, convert them to a single object
with the REGION command)
Example: Use Splines to Create 3D NURBS Surfaces
Splines are one of the many 2D object types that can be lofted, extruded,
swept, and revolved to create NURBS surfaces. Other 2D objects that can be
used include lines, polylines, arcs, and circles. Splines, however, are the only
2D object customized to create NURBS surfaces. Because they allow you to
adjust tolerance, degree, and tangency, they are better suited than other types
of 2D profiles (line, plines, circles) for surface modeling.
448 | Chapter 22 Create 3D Models