8

Point Surface 1103
Editing Surface Sub-Objects (page 1–1142)
You can also create NUR B S surface sub-objects
by
attaching or importing other 3ds Max objects
(page 1–1121)
.
Both NURBS curves and NURBS surfaces have a
DisplayareaintheGeneralrolloutontheModify
panel. These controls affect which portions of
the NURBS geometry are displayed. Next to the
Display area is the button that turns on the toolbox
for creating sub-objects.
Display Controls for NURBS Models (page
1–1119)
Wa rni ng: 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 transforming,
animating, applying modifi ers, 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
MAXScript help file. Choose Help > Additional
Help, and then choose MAXScript from the list
of additional help files.
Poi nt Su rf a ce
Create panel > Geometry > NURBS Surfaces > Point Surf
Createmenu>NURBS>PointSurface
Points shape the surface they l ie on.
Point surfaces are NURBS sur faces (p age 1–1102)
whose points are constrained to lie on the surface.
Because an initia l NURBS surface is meant to
be edited, the surface c reation parameters
do
not appear
on the Modify panel. In this respect,
NURBS surface objects are different from other
objects. The Modify panel provides other ways to
change the values you set in the Create panel.
Procedure
To create a p oint s ur f a ce:
1.
Go to the Create panel.
2. Tu r n on Ge ome tr y, and cho ose NUR BS
Surfaces from the drop-down list.
3. Tu r n on Poi nt Sur f .
4. In a viewport, drag to specify the area of the
planar seg ment.
5. Adjust the surface’s creation parameters.