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1084 Chapter 9: Surface Modeling
selected and you are on the Modify panel. It
disappears whenever you deselect the NURBS
object or make a diff er ent panel active. When
you return to the Modify panel and select a
NURBS object, it reappears.
• You can use the toolbo x to create sub-objects
from either the top, object level, or f rom any
NURBS sub-object level.
• When you turn on a toolbox button, you go into
creation mode, and the Modify panel changes
to show the parameters (if there are any) for the
kind of sub-object you are creat ing.
Other N URBS rollouts aren’t displayed whi le
you create the new sub-object. This differs from
using the NU RBS object’s Create rollouts or the
NURBS right-click menu (page 1–1082).
• If you are at the top, object level and use the
toolbox to create a sub-object, you must then
go to the sub-object level to edit the new
sub-object. (This is the same as using the
buttons on the rollouts.)
• Ifyouareatasub-objectlevelandusethe
toolbox to create an object of the same
sub-object type, you can edit it immediately
after you turn off the create button (or
right-click to end object creation).
• Ifyouareatasub-objectlevelandusethe
toolbox to create an object of a different
sub-object type, you must change to that
sub-object level before you can edit the new
sub-object.
The individual creation buttons are described in
these topics:
Cr eating and Editing Point Sub-Objects (page
1–1219)
Creating Curve Sub-Objects (page 1–1151)
Creating Surface Sub-Objects (page 1–1177)
Sub-Object Selection
When you work with NURBS models, you often
work with sub-objects. While you are at the
sub-object level, you use the usual selec tion
techniques, such as clicking, dragging a region,
or holding down
Ct rl , to choose one or more
sub-objects.
You can also select NURBS point, cur ve, and
surface sub-objects by name. Tu rn on the
Keyboard Shortcut Over ride Tog g le (page 3–872),
go to a NURBS sub-object level, and then press the
H key . This displays a Select Objects dialog (page
1–78) that lists only sub-objects at the current
level.Chooseoneormoreobjectsinthelist,and
then click Select. You can assign your own names
to NURBS sub-objects (aside f rom CVs) that you
want to edit frequently.
Press
Ct rl +H to have the Select Sub-Objects
dialog list only sub-objects directly beneath t he
mouse cursor.
The
H shortcut is also a con v enient way to choose
parent objects while you’re creating dependent
sub-objects.
Wo rkflow Ti ps
When you work with NURBS, you switch
frequently between the object and sub-object
levels, or fr om one sub-object level to another.
Key b oard shortcuts and pop-up menus can help
you do this.
• The Sub-Object Selection Toggle (default:
Ctrl +B ) switches between object and
sub-object levels.
• The Cycle Sub-Object Level shortcut (default:
Inser t )switchesfromonesub-objectlevelto
another.
• When you right-click in a viewport while a
NURBS object is selected and the Modify
panel is active, the quad menu lets you switch