9

1122 Chapter 9: Surface Modeling
Co mmo n Su b-Object Controls
Many controls are common to the various kinds of
sub-object s in NURBS models (with the exception
of Imports (page 1–1120)). This topic introduces
the controls that are common to most NURBS
sub-objects.
See also
Editing Point Sub-Objects (page 1–1123)
Editing Curve CV Sub-Objects (page 1–1127)
Editing Surface CV Sub-Objects (page 1–1130)
Editing Curve Sub-Objects (page 1–1135)
Editing Surface Sub-Objects (page 1–1141)
Transforming Su b-Object s
One wa y to alter a NURBS model is to transform
its sub-objects. Transforming lets you interactively
changethemodel’scurvatureandshape.
Transforming points or CVs is especially usef ul for
adjusting the shape of a NURBS curve or surface.
Yo u c a n a l s o
Shif t +Clone most k inds of
sub-objects, except CVs. For curves and surfaces,
Shi f t +Cloning displays a Sub-Object Clone
Options dialog (page 1–1237),whichletsyou
reduce relational dependencies to improv e
perfor mance.
Selection Controls
There is a Selection group box on the rollout for all
NURBS sub-objects except Imports. The buttons
in this group let you con trol which sub-objects
to select. The selection buttons let you select
sub-objects indiv idua lly, or multiple sub-objects at
once. For example, Surface CV selection buttons
give you the option of selecting individual CVs, or
selecting a row of CVs on the surface, and so on.
Note: There is no delete modifier for NURBS
curves as there is for splines. There is a NURBS
selection modifier, NSurf Sel (page 1–747).See
NURBS and Modifiers (page 1–1089).
Selection controls also include a Name field that
lets you customize the name of individual NURBS
sub-objects other than CVs. (The Name field is
the only selection control for Import sub-objects.)
V isibility
You can hide or unhide NURBS sub-objec ts as
you do other objects. Hidden sub-objects are
invisible in viewports, but remain renderable.
(Atthesub-objectlevel,hidingdoesn’taffectthe
renderer.) You can’t select hidden sub- objects.
Hide and unhide by name is available for curve
and surface sub-objects.
Mak e Independent
You can make a dependent point, curve, or su rface
sub-object independent.
Wa rn in g : When you make an objec t independent,
you lose t he animation controllers for all objects that
depend on it in turn. When you make point objects
independent, you lose the animation controllers for all
points on the curve or sur face. Also, if you make a c urve
that trims a surface i ndep endent, you lose the trimming
of the surface.
Remove Animation
All sub-object rollouts have a Remove Animation
button. This removes animation controllers from
the selected sub-objects.
Deta ch and Copy
You can create a new curve or surface object by
detaching a curve or surface sub-object from
a NURBS model. To do so, select the curve
or surface and then click Detach. A dialog is
displayed, which lets you enter a name for the new
NURBS object. The new object is no longer p art of
the original NURBS object.