9

1214 Chapter 9: Surface Modeling
Tip:
If the multisided blend surface c an’t be created,
fuse the points or CVs at the corners where the
surfaces meet. Sometimes snapping the corners
doesn’t work, because of round-off error.
Procedure
To create a multisided blend:
1.
Click to tur n on Multisided Blend in the
toolbox or N Blend on the
Create Surfaces
rollout.
2. In turn, click the three or four surface sides or
curves that surround the opening.
You can flip normals on the multisided blend
while creating it.
3. Right-click to end creation.
A new surface is created. It covers the opening.
Inter face
Multisided Blend sur faces have no parameters
other than those on the Surface Common rollout
(page 1–1141).
Multicurve Tr immed Sur face
Select NURBS object. > Modify panel > Create Surfaces
rollout > Dependent Surfaces group box > Multi-Trim
Select NURBS object. > Modify panel > NURBS toolbox >
Create a Multicurve Trimme d Surface button
Creating a multicurve trimmed surf ace
A multicurve trimmed surface is an existing
surface trimmed by multiple curves that form a
loop.
When you create a multicurve trimmed surface,
you create only one trimmed hole. If you want
to create multiple holes, first create holes in the
surface using other techniques, and as the final
step create the multicurve trim.
You can’t trim across the edge between two
surfaces, or across a "seam" where a surface
touches itself, as at the back of a spherical surface
created by conver ting a Sphere primit ive.
Procedure
To create a multicurve tr im:
1.
Create a loop out of multiple curve sub-objects.
2. AttheCurveCVorPointsub-objectlevel,use
Fuse to connect the ends of the curves.
The curves must form a single closed loo p, or
completely traverse the surface.