8

1-Rail Sweep Surface 1205
U Cur v es and V Cur v es—
These lists show the names
of the curves you click, in the order you click them.
You can select a curve by clicking its name in a list.
Viewports display the selected curve in blue.
The two buttons above and the four below each list
are identical for both lists.
Arrow Buttons—Usethesetochangetheorderof
curvesintheUCurveorVCurvelist. Selecta
curveinthelist,andthenusethearrowstomove
the selection up or down.
Insert—Adds a curve to the U list or V list. Click
to turn on Inser t, then click the curve. The cur ve
is inserted
before
the selected curve. To insert a
cur ve at the end, first hig hlight the "----End-----"
marker in the l ist.
Remove—Removes a curve from the U list or V list.
Selectthecurveinthelist,andthenclickRemove.
RefineRefines the UV loft surface. Click to turn
on Refine, then click an iso curve on the surface.
(As you drag the mouse over the surface, the
available curves are hig hlighted.) The curve you
click is converted to a CV curve and inserted into
the loft and the U Curves or V Curves list. As when
you refine a point cur ve, refining a UV loft can
change the curvature of the surface slightly. Once
you ’ve refined the surface by adding a U curve or
Vcurve,youcanuseEditCurvestochangethe
cur ve.
Replace—Lets you replace the selected curve.
Select a curve in the list, click this button, then
select the new curve.
Display Iso Cur ves—When set, the UV loft’s iso
cur ves are displayed as well as the U-axis and
V-axis curves used to construc t the loft. The iso
curves are only for display. You can’t use them for
surface construction.
Edit Cur ves—Lets you edit the currently selected
curve without switching to another sub-object
level. ClicktoturnonEditCurve. Thepoints
or CVs of the curve are displayed, as well as the
control lattice if the curve is a CV curve. You can
now transform or otherwise change the points
or CVs as if you were at the Point or Curve CV
sub-object level. To finish editing the curve, click
to turn off Edit Curves.
WhenyouturnonEditCurves,allapplicable
rollouts for the selected curves are displayed,
including the Curve Common rollout, the CV
or Point rollout (depending on the curve type),
and t he CV Curve or Point Curve rollout. These
rollouts appear beneath the U Loft rollout. They
let you edit the loft curves and their points or CVs
w ithout having to switch sub-object levels.
Tip: When you edit c urves in a UV loft, turning
off display of the UV loft itself can make the
cur ves easier to see and improve per formance. Use
CTRL+D (while the
Keyboard Shortcut Override
Toggle button (page 3–912)
is on) to toggle display
of dependent sub-objects, including UV lofts.
The UV loft surface can deviate from the curve
if you edit a curve in a UV loft by increasing the
weight of the curve CVs. You can work around
this by refining the curve at the point where the
surface deviates.
1-R ail Sweep Sur face
Select NURBS object. > Modify panel > Create Surfaces
rollout>DependentSurfacesgroupbox>1-Rail
Select N URBS obj ect. > Modify pane l > NURBS toolbox >
Create 1-Rail Sweep button
Sweep sur faces are constructed from curves. A
1-rail sweep surface uses at least two curves.
Onecurve,the"rail,"definesoneedgeofthe
surface. The other curves define the sur face’s cross
sections.