9

Editing Curve Sub-Objects 1137
To reverse a curve:
• Select a curve sub-object and then click
Reverse.
Reversing a curve affects the blend surface that depends
on it.
To join two curves:
1.
In a NURBS object that contains two curve
sub-objects, turn on Join.
2. Click one curve near the end that you want
to connect. Drag to near the end of the other
curve, and then release the mouse.
The Join Curve dialog (page 1–1232) is
displayed. This dia log gives you a choice of
methods for joining t he curves. Whichever
method you cho ose, the two or iginal curves are
replaced by a single curve.
3. If the gap between the curves is small (less than
about30units),usetheJoinCurvedialogtoset
theTolerancevaluegreaterthanthedistance
of the gap .
To break a curve:
• TurnonBreakandthenclickacurve.
Thecurveissplitintotwoindependentcurve
sub-objects.Twocoincident(butindependent)
points or CVs are created at the location you
clicked: each is the endpoin t of one part of the
original curve.
If the curve is a closed curve, Break creates a
single curve object, with its new star t and end
points at the location you clicked. The new start
and end points are coincident but independent.
To clo se a curve:
• Select the curve and then click Close.
Thesoftwareclosesthecurvebyaddinga
segment between the curve’s endpoints. The
curvature of the new segment blends the
curvature of the prev ious end segments.
Closing a curve does not add points or CVs. The
curve retains its original number of points or CVs,
and increases its number of segments by one.