9

NURBS Surfaces 1101
NURB S Sur face Primitives
Create panel > Geometry > NURBS Surfaces
Create menu > NURBS > CV Sur face/Point Su rface
NURBS (page 3–980) sur face objects are the basis
ofNURBSmodels.Theinitialsurfaceyoucreate
usingtheCreatepanelisaplanarsegmentwith
points or CVs. It is meant simply to be "raw
material" for creating a NURBS model. Once
you have created the initial surface, you can
modify it on the Modify panel by moving CVs or
NURBS points, attaching other objects, creating
sub-objects, and so on.
There are two kinds of NURBS surfaces:
Point Surface (page 1–1102)
CV Surface (page 1–1103)
Yo u c a n a l s o create a NURBS surface from a
geometric primitive (page 1–1116) .
NURBS surfaces can contain multiple sub-objects,
including N URBS points, NURBS curves, and
other NURBS surfaces. T hese sub-objec ts are
either dependent or independent.
Creating Curve Sub-Objects (page 1–1151)
Creating Surface Sub-Objects (page 1–1177)
Cr eating and Editing Point Sub-Objects (page
1–1219)
Common Sub-Object Controls (page 1–1122)
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)
Yo u c a n a l s o c r e a t e N U R B S s u r f a c e s u b - o b j e c t s b y
attaching or importing other 3ds Max objects (page
1–1120).
Both NURBS curves and NURBS surfaces have a
Display a rea in the General rollout on the Modify
panel. These controls affect w hich portions of
theNURBSgeometryaredisplayed.Nexttothe
Display area is the button that turns on t he toolbox
for creating sub-objects.
Display Controls for N UR BS Models (page 1–1117)
Wa rn in g : When you move CV sub-objects, the effect
must be calculated over a region of the surface.
Although the calculations are optimized, this is a more
involved process than simply moving vertices in an
editable mesh. Because of this, if you manipulate large
numbers of a NURBS surface’s CVs by t ransforming,
animating, applying modifiers, and so on, you will notice
adropininteractiveperformance.
Yo u c a n u s e M A X S c r i p t t o c o n t r o l N U R B S o b j e c t s .
See " Working with NURBS in MAXScript" in the
MAXScripthelpfile.ChooseHelp>Additional
Help, and then choose MAXS cript from the list
of additional help files.