9
Editing Curve CV Sub-Objects 1129
Selection group
Curve sub-object selection controls
Single CV —(The default.) When on, you can select
individual CVs by clicking, or groups of CVs by
dragging a region.
All CVs—When on, clicking or dragging selects all
the CVs in the curve.
Name—Showseither"NoCVsselected","Multiple
CVs selected", or "CurveName(index)", where
"CurveName" is the name of the CV’s parent
cur ve, and "index" is the CV’s U location along the
length of the curve. You can’t edit the Name field
to customize the names of CVs.
If CVs are fused, the Name field shows the name
of the first CV.
Weigh t—Adjusts the weight of the selected CVs.
Yo u c a n u s e a C V ’ s weight to adjust the CV’s effect
on the curve. Increasing the weight pulls the curve
toward the CV. Decreasing the weight relaxes the
curve away from the CV.
Increasingweightisawaytohardenacurve;that
is, to sharpen its curvature at a particular location.
By default, the weight is 1.0 for the CVs of NURBS
objects that you create on the Create panel or the
NURBS sub-object creation rollouts. The weight
of CVs in geometry that you convert to NURBS
canvary,dependingontheobject’soriginalshape.
You can change the weight when multiple CVs are
selected. Using the Weig ht field or spinner while
multiple CV s are selec ted assigns a ll of them the
value you choose. Because weights are relative to
each other (rational), using the Weight control
when all CVs are selected has no visible effect.
Hide—Click to hide the currently selected CVs.
Unhide A ll—Click to unhide all hidden CVs.
Fuse—Fuses a CV to another CV. (You can ’t fuse a
CV to a point, or vice versa.) This is one way to
connecttwocurves.Itisalsoawaytochangethe
shape of curves.
Fusing CVs does not combine the two CV
sub-objects. They are connected but remain
distinct sub-objects that you can unfuse later.
Fused CVs behave as a single CV until you unfuse
them. Fused CVs behave similar to a single point,
but the property of multiplicity for coincident CVs
also applie s. (See NURBS Concepts (page 1–1091)
and CV Curve (page 1–1110).) The fused C V s
have proportionally more influence on the curve.
The curve c an b ecome sharper in the fused CVs’
vicinity, or even angular if more than two CVs are
fused together.
Fused CVs are displayed in a distinct color. The
default is purple. (You can change this color u s ing
the Colors panel (page 3–799) of the Customize
User Interface dialog (page 3–792).)
Unfuse—Unfuses the fused CVs.