8

Creating Curve Sub-Objec ts 1153
project, this field displays the name of the projector
(source) sur face. Otherwise, this field says "None."
Cr eat i ng Cu rv e S ub-Obj ect s
Selec t NURBS object. > Modify panel > C reate Curves
rollout
SelectNURBSobject.>Modifypanel>NURBStoolbox
Keyboard > CTRL+T to toggle NURBS toolbox display
(Plug-In Keyboard Shortcut To gg le mu st be on)
Curvesub-objectsareeitherindependentpoint
and CV curves (similar to the top-level point
and CV c urves described in
Point Curve (page
1–1108)
and CV Curve (page 1–1112) ), or they
are dependent curves. Dependent curves are curve
sub-objects whose geometry depends on other
curves, points, or surfaces in the NURBS object.
When you change the geometry of the original,
parent sub-objects, the dependent curve changes
as well.
Youcreatecurvesub-objectsusingtheCreate
Curves rollout on the Modify command panel for
a NURBS curve.
Tip: Lathe and extrude surface sub-objects can
be based on only a sing le curve; see
Creating
Dependent Surfaces (page 1–1179)
.Ifyoucreate
dependent curves and then want to use the set
of curves (for example, two parents and a fillet
between them) as the basis of an extrude or loft
surface, first go to the Curve sub-object level and
useJointoconnectthecurves.
Creation operations for dependent sub-objects
require you to select one or more parent objects.
In general, you can click and drag, or click and
then click again. You can also use the H keyboard
shortcut to display a selec t-by-name dialog for
choosing the parent. (The
Plug-In Keyboard
Shortcut Tog g le (page 3–912)
button on the status
barmustbeonforHtoworkthisway.)
Toolbox B uttons f or Creati ng Cur ves
These are the toolbox (page 1–1085) buttons for
creating curve sub-objects:
Create an independent CV curve sub-object
(page 1–1154)
.