8

Using the Stack at the Sub-Object Level 493
hierarchy, showing the names of the sub-object
levels at which you can work.
3. On the stack display, choose the kind of
sub-object geometry you want to work with:
for example, Ver tex, Face, or E dge. Each
sub-object selection level has rollouts with their
own sets of options.
The sub-object level highlight is yellow by
default.
4. Use standard selection techniques to select
sub-object geometry, from a single sub-object
to t he entire object. By default, the sub-object
selection highlig hts in red.
Once you make a sub-object selection of geometr y,
you can do any of the following:
• Apply any options supplied for the kind of
object and the selection level.
• Apply standard transforms (move, scale,
rotate). See Transforming a Sub-Object
Selection (below).
• Apply object-space modifiers (Bend, Taper, and
Twist, for example) to perform useful modeling
operations.
•Binda
space warp (page 2–51) to the selection.
The rest of the object is unaffected by the
warping.
• Use the toolbar commands
Align (page 1–447) ,
Normal Alig n (page 1–450) ,and Align To View
(page 1–453)
with face selections.
Tra nsf or ming a S ub-Object Sel ection
Using an editable mesh, poly, patch, or spline, you
can directly t ransform any sub-object selection.
However, “Select” modifiers like
Mesh Select (page
1–710)
and Spline Select (page 1–822) enable only
selection.
To transform a sub-object selection made with a
Select modifier:
1.
Add an XForm modifier (p age 1–942) to the
stack,following(orsomewhereabove)the
Select modifier.
2. In the stack, open the Select modifier and make
a sub-object selection.
3. Choose XForm in the stack. You then t ransform
the XForm gizmo, which applies the transform
to the selection.
Selecting and Transforming Modifier
Components
Most modifiers have sub-object components,
such as a gizmo and center. Like sub-object
geometry, these components can be accessed
and t ransformed at sub-object level, directly
modifying the object’s shape.
Other modifiers, like those for free-form
deformation, have control points and lattices at a
sub-object level. Moving these components creates
the mo deling effects of the modifier.
Using the Stack at the Sub-Object
Lev el
Witheditableobjectssuchasmeshesandsplines,
or modifiers with sub-object levels such as Mesh
SelectandSplineSelect,youcancontinuetomodel
a single sub-object select ion by applying any
number of other modifiers. When you go back and
change the original selection, the new selection is
"passed up the stack" to the modifiers that follow.
Editable meshes and splines have "built-in"
sub-object selection at their base level. But the
selections you make with Mesh Select and Spline
Selectworkexactlythesamewayonthestack.
This topic uses meshes for its examples. You
canapplythesameconceptstoeditablesplines,
patches, and poly objects.