Meshes and Surfaces - Autodesk AutoCAD 2013 Practical 3D Drafting and Design - page 394

Procedural surfaces
Procedural surfaces can be created from linear objects, with some commands
presented in Chapter 4 , Creating Solids and Surfaces from 2D , such as EXTRUDE or
SWEEP , also with PLANESURF , presented in Chapter 5 , 3D Primitives and Conver-
sions , and with SURFNETWORK , presented next section. These surfaces can also be
obtained from other surfaces, applying known operations such as blend, fillet, or off-
set. Included are also two editing commands and a command to create solids from
surfaces.
The SURFACEMODELINGMODE variable must have value 0 . With value 1 , NURBS
surfaces are created instead when applying next commands. The SURFU and SURFV
variables control the surface isolines density in the first and second directions and
can be modified any time with the PROPERTIES palette.
Access to commands
Most procedural and NURBS surface commands are on the ribbon, Surface panel,
on the Draw / Modeling and Modify / Surface Editing menu bars, and on the Surface
Creation and Surface Editing toolbars.