8

1160 Chapter 9: Sur face Modeling
Blend curves connecting original curves
Procedure
To creat e a blend cu rve:
1.
In a NURBS object that contains two
curves,turnonBlend.
2. Click one curve near the end that you want
to connect. The end that will be connected
is highlighted. Without releasing the mouse
button, dr ag to the end of the other curve
that you want to connect. The other end is
highlighted as well. When the end that you
want to connect is highlighted, release the
mouse button.
After the blend curve is created, changing the
position or the curvature of either p arent curve
changes the blend curve as well.
3. Adjust the blend parameters.
Inter face
Blend Curve rollout (creation time)
"Tension" affects the tangent between a parent
curveandtheblendcurve.Thegreaterthetension
value,themorecloselythetangentparallelsthe
parent curve, and the s moother the transition. The
lower the tension, the greater the tangent angle
and t he sharper the transition between parent and
blend.
Tension 1—Controls tension at the edge of the first
curve you clicked.
Tension 2—Controls tension at the edge of the
second curve you clicked.
Blend Curve rollo ut (modification time)
"Tension" affects the tangent between a parent
curveandtheblendcurve.Thegreaterthetension
value,themorecloselythetangentparallelsthe
parent curve, and the s moother the transition. The
lower the tension, the greater the tangent angle
and t he sharper the transition between parent and
blend.
Tension 1—Controls tension at the edge of the first
curve you clicked.
Tension 2—Controls tension at the edge of the
second curve you clicked.
ReplaceFirstCurveandReplaceSecondCurve—Let
you replace the parent curves. Click the button,
then click the curve to replace the original first or
second cu rve.