8

1172 Chapter 9: Sur face Modeling
of projections, the projection closest to the seed
pointistheoneusedtocreatethecurve.
Normal Projected Curve rollout (modification
time)
Trim Controls group
Trim—When on, trims the surface against the
curve. When off, the surface isn’t t rimmed.
If it’s impossible to trim w ith this curve, the surface
is displayed in the error color (orange by default).
Forexample,thecurveisunusablefortrimmingif
it neither crosses the edge of the surface nor forms
aclosedloop.
Flip Trim—When on, trims the surface in the
opposite direction.
U S eed an d V S eed—Change the UV location of
theseedvalueonthesurface.Ifthereisachoice
of projections, the projection closest to the seed
pointistheoneusedtocreatethecurve.
Replace Curve and Replace Sur face—Let you replace
the parent sub-objects. C lick a button, then click
acurveorsurfacetoreplacetheoriginalparent
object.
Vector P roj ected Curve
Select NURBS object. > Modify panel > C reate Curve s
rollout>DependentCurvesgroupbox>VectorProj.
button
Select N URBS obj ect. > Modify pane l > NURBS toolbox >
Create Vector Projected Curve bu tton
A Vector Projected curve lies on a surface. This
isalmostthesameasaNormalProjectedcurve,
except that the projection from the original curve
to the surface is in the direction of a vector that
you can control.
You can use vector projected curves for
trimming
(page 1–1082)
.
Trimmingasurfacewithavectorprojectedcurve
If the projection intersects the surface in two or
more locations, the intersection closest to the seed
pointistheonethatcreatesthecurve.
Procedure
To create a vector pr ojected cur v e:
1.
In a NURBS object that contains at least
onesurfaceandonecurvesub-object,clickto
turn on Vector P
rojected Curve in the NURBS
toolbox or Vector Proj. in the Create Curves
rollout.