8

U Loft Surface 1197
creation, you can flip normals using controls on
the Surface Common rollout.)
Inter face
While a cap surface sub-object is selected, a rollout
with cap surface controls is displayed at the bottom
of the Modify panel.
Cap Surfa ce rollout (creation t im e)
Flip Normals—Turn on to reverse the direction of
the c ap surface’s normals.
Start Point—Adjusts the position of the edge or
curve’s start point.
Thestartpointisdisplayedasabluecircle.
Cap Surface rollout (modification time)
Replace Curve—Lets you replace the parent curve
or edge. Click the button, then click the new curve
or edge on which to base the cap.
Start Point—Adjusts the position of the edge or
curve’s start point.
Thestartpointisdisplayedasabluecircle.
ULoftSurface
Select NURBS object. > Modify panel > Create Surfaces
rollout>DependentSurfacesgroupbox>ULoft
Select N URBS obj ect. > Modify pane l > NURBS toolbox >
Create U Loft Surface b utton
A U loft surface interpolates a surface across
multiple curve sub-objects. T he cur ves become
U-axis contours of the surface.
Using multiple curves to create a U Loft surface
Tips
• A U loft can be an extremely dense surface.
Toimproveperformancewhileworkingwith
viewports, set the
surface approximation (page
1–1241)
for viewports to Curvature Dependent.
• You can speed up U loft creation by making
sure that the curves you loft have the same
number of CVs in the same order (that is, the
curves point in the same direction). Als o, CV
curves have a performance advant age over
point curves.
• Turning off display of dependent sub-objects,
including the U loft itself, also speeds up
interactive performance when you create a U
loft. T he default keyboard tog gle for dependent
sub-object display is CTRL+D (the
Keyboard
Shortcut Override Toggle (page 3–912)
button
must be on.)