9

1210 Chapter 9: Surface Modeling
Exa mple: To create a 2-rail sweep with automatic
attach:
1.
FromtheCreatepanel,createthreeindependent
CV or Point NURBS curves.
2. Go to the Modify panel, and click to turn on
2-Rail Sweep in the NURBS toolbox.
3. Selectthecurvesintheappropriateorderfor
the sweep.
The sweep is created. You don’t need to collapse
the curves to a NURBS surface or Attach them
to an existing NUR BS model.
Asyoumovethemouseoveracurvethatisnot
partoftheactiveNURBSobject,thecursor
changes shape to indicate that you can pick the
cur ve, but the curve is not high lighted in blue.
Inter face
While a 2-r ai l sweep sub-object is selected, a
rollout with the 2-rail sweep parameters appears.
This rollout appears only and when one 2-rail
sweep sub-object is selected. It isn’t possible
to edit more than one 2-rail sweep at a time,
so unlike some other NURBS sub-objec ts, the
rollout doesn’t appear when multiple 2-rail sweep
sub-objects are selected.
Tip: When you edit a 2-rail sweep sub-object,
closetheSurfaceCommonrollouttoseethe2-rail
sweep surface rollout more easily.
2-Rail Sweep Surface rollout (creation time)
Rail Curves—Shows the names of the two cu rves
you chose to be the rails.
Section Curves—Thislistshowsthenamesofthe
cross-section curves, in the order you click them.
You can select a curve by clicking its name in t he
list. Viewports display the selected curve in blue.
Arr ow B uttons—Usethesetochangetheorderof
section curves in the list. Select a curve in the list,
and then use the arrows to move the selection up
or down.
Curve Properties group
These controls affect individual curves you select
in the Section Cur ves list, as opposed to propert ies