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1152 Chapter 9: Sur face Modeling
box in 3D viewports, and the U and V spinners
are enabled.
UandV—Unavailableunlessyou’vechosenoneof
the Corners radio buttons. When available, you
use these spinners to set t he U and V texture values
for the chosen corner.
By default, t he U and V values for most surfaces
range from 0.0 to 1.0. For some kinds of geometry
converted to a NURBS surface, these ranges can
vary.
Texture Surface group
Thecontrolsinthisgroupboxletyouchoose
a method for mapping texture to the currently
selected NURBS surface sub-object, and to adjust
the parameters for some of the chosen methods.
These controls are available when Generate
Mapping Coordinates is on.
A texture surface is a surface associated with the
surface sub-object. The texture sur face controls
how materials are mapped. In effect, changing
thetexturesurfacestretchesorotherwisechanges
the U V coordinates for the surface, altering the
mapping.
Maps can shift w ith certain sur face approximation
methods. This effect is especially noticeable when
thesurfacehasanimatedCVs.Youcanreduceor
eliminate map shifting by changing the mapping
method to User Defined.
Tip: Don’t use the UVW Map modifier to apply a
texture to an animated NURBS surface.
Default—Automatically generates a texture
surface. This method evenly distributes the texture
and attempts to compensate for s tretching of the
surface.
The default texture sur face metho d has no
additional controls.
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 Textur e Sur f ace—Click to display the Edit
Texture Surface dialog (p age 1–1232)
,which
lets you control UV mapping on this surface.
This button is available when you’ve chosen User
Defined as t he 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 E dit 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.
Proj ected—Generates the texture surface by
projecting the texture of another NURBS surface
sub-object in the NURB S model. The projection
travels along the direction of the normals of the
source surface.
Projected texture surfaces are relational: if you
update the source surface, the texture updates on
all the surfaces it projects onto.
Ifyouusethesamesourcesurfacetoprojecta
texture onto several other connected surfaces, the
textures will match along the boundaries where
the mapped surfaces touch.
Pick Source Sur fa ce—This button is available when
you’ve chosen Projected as the texture surface
method. To choose a source (projector) surface,
chooseProjected,clicktoturnonthisbutton,and
then click in a viewport to select another surface
sub-objectinthesameNURBSmodel.
Source text field—If Projected is the chosen texture
surface method and you have picked a surface to