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Set Surface Properties Before and After Creation
Set defaults that control a variety of surface properties before and after you
create the surface objects.
 Surface Modeling System Variables. There are a number of system variables
that are frequently used and changed during surface creation:
SURFACEMODELINGMODE, SURFACEASSOCIATIVITY,
SURFACEASSOCIATIVITYDRAG, SURFACEAUTOTRIM, and
SUBOBJSELECTIONMODE.
 Properties Inspector. Modifies properties for both the surface objects and
their subobjects after they are created. For example, you can change the
number of isolines in the U and V directions.
Create Procedural Surfaces
Create procedural surfaces by blending, patching, and offsetting existing
surfaces or by converting 3D solids, meshes and other planar geometry.
Create Surfaces from Other Surfaces
There are many ways to create procedural surfaces from existing surfaces.
These include blending, patching, and offsetting or creating network and
planar surfaces.
When you create procedural surfaces, use SURFACEASSOCIATIVITY to work
with the surfaces as a group. Just as you can modify the face of a solid and
have the entire solid update, when you modify a group of surfaces that are
associative, all of the surfaces update accordingly.
Create Planar Surfaces
Create planar surfaces in the space between edge subobjects, splines and other
2D and 3D curves.
Create planar surfaces with the PLANESURF command Planar surfaces can be
created from multiple closed objects and the curves can be surface or solid
edge subobjects. During creation, specify the tangency and bulge magnitude.
398 | Chapter 8 Work with 3D Models