8

1184 Chapter 9: Sur face Modeling
Procedure
To create a transform surface:
• In a NURBS object that contains at least
one surface, turn on Transform.
To move the transform surface, click and drag
thesurfaceyouwanttoduplicate.Torotateor
scale the transform surface, click the parent
surface,clicktoturnonSub-Objectonthe
Modifier Stack rollout, choose Surface from the
drop-down list, and then use a transform to
rotate or sca le t he transform surface.
When you use Move to create the transform
surface, it simply copies the parent. (It doesn’t
exaggerat e curvature as an offset surface does.)
Axis constraints don’t apply to the creation
of transform surfaces. You can click to create
the surface in place; then once it is created,
transform it using constraints.
The Flip Normals control lets you flip the
surface normals at creation time. (After
creation, you ca
n flip normals using controls on
the Surface Common rollout.)
You can later transform the transform surface as a
surface sub-obj
ect, and you can animate surface
sub-object t ransforms.
Inter face
Creation time
At creation time, transform surfaces have no
parameters.
Transform Surfa ce rollout (modification time)
ReplaceBaseSurface—Lets you replace the parent
surface. Click the button, then click the surface to
replace the original surface.
Blend Surface
Select NURBS object. > Modify panel > Create Surfaces
rollout>DependentSurfacesgroupbox>Blend
Select N URBS obj ect. > Modify pane l > NURBS toolbox >
Create Blend Surface button
A blend surface connects one surface to another,
blending the curvature of the parent surfaces to
create a smo oth surface between them. You can
also blend from a surface to a curve, or from a
curve to a curve.
Blend surface connecting two other surfaces
Procedure
To create a b lend s urf ace:
1.
In a NURBS objec
tthatcontainstwo
surfaces, two curves, or a surface and a curve,
turn on Blend.