9

Creating Cur ve Sub-Objects 1151
User Def ined—
Generates a texture surface that you
can edit. You edit the user-defined texture surface
either by using an Edit Texture Surface dialog (as
you did in 3ds Max prior to v3), or by editing
texture points directly in viewports.
Edit Texture Sur fa ce—Click to display the Edit
Texture Surface dialog (page 1–1230),whichlets
you control UV mapping on this surface. This
button is available when you’ve chosen User
Defined as the texture surface method.
Edit Tex ture Points—Click to edit texture surface
points directly in viewports. This button available
when you’ve chosen User Defined as the texture
surface method.
While Edit Texture Points is on, the points of
the texture surface are displayed in viewports,
where you can adjust their positions by using the
selection and transform tools.
Projected—Generates the texture surface by
projecting the texture of another NURBS surface
sub-object in the NU RBS model. The projection
travels along the direction of the normals of the
source surface.
Projected texture surfaces are relational: if you
updatethesourcesurface,thetextureupdateson
all the surfaces it projects onto.
Ifyouusethesamesourcesurfacetoprojecta
texture onto several other connected sur faces, the
textures will match along the boundaries where
the mapped surfaces touch.
Pick Source Surface—This button is available when
you’ve chosen Projected as the texture sur face
method. To choose a source (projector) surface,
choose Projected, click to turn on this button, and
then click in a viewport to select another surface
sub-objectinthesameNURBSmodel.
Source text field—If Projected is the chosen texture
surface method and yo u have picked a surface to
project, this field displays the name of the projector
(source) sur face. Other wise, this field says "None."
Cr eating Cur ve Sub-Objects
Select N U RBS object. > Modify panel > Create Curves
rollout
Select NURBS object. > M od ify panel > NURBS toolbox
Keyboard > Ct rl +T to toggle NURBS toolbox display
(KeyboardShortcutOverrideTogglemustbeon)
Curvesub-objectsareeitherindependentpoint
and CV curves (sim i lar to the top-level point
and CV curves described in Point Curve (page
1–1106) and CV Curve (page 1–1110)), or they are
dependent cur ves. Dependent cur ves are curve
sub-objects whose geometry depends on other
cur ves, points, or surfaces in the NURBS object.
When you change the geometry of the or iginal,
parent sub-object s, the dependent curve changes
as well.
You create curve sub-objects using the Create
Curves rollout on the Modify command panel for
aNURBScurve.