2011

To create a surface when the Solid tab is active or a solid when the Surface tab
is active, select the Mode option and select surface while you are creating the
object.
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)
Create Associative Surfaces
Surfaces can be associative while solids cannot. If surface associativity is on
when a surface is created, it maintains a relationship with the curve from
which it is was generated (even if the curve is the subobject of another solid
or surface). If the curve is reshaped, the surface profile automatically updates.
See
Create Associative Surfaces on page 1036.
NOTE To modify a surface that is associative, you must modify the generating
curve and not the surface itself. If you reshape the surface, its link to the generating
curve will be broken and the surface will lose associativity and become a generic
surface.
Deleting the Curves that Generate the Solid or Surface
The DELOBJ system variable controls whether the curves that generate an
object are automatically deleted after the solid or surface is created. However,
if surface associativity is on, the DELOBJ setting is ignored and the generating
curves are not deleted.
Create a Solid or Surface by Extruding
Create a 3D solid or surface by stretching curves into 3D space.
968 | Chapter 24 Create 3D Models