8

CV Curve on Surface 1175
Inter face
CV Curve on Surface rollout (creation tim e)
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 doesn’t form a closed loop.
Flip Trim—When on, trims the surface in the
opposite direction.
Automatic Reparameterization group
Theradiobuttonsinthisgroupboxletyou
choose automatic reparameterization. With
reparameterization, the curve maintains its
parameterization as you edit it. Without
reparameterization, the curve’s parameterization
doesn’t change as you edit it, and can b ecome
irregular.
None—Do not reparameterize.
Cho rd L e n g t h —Chooses the chord-length
algorithm for reparameterization.
Chord-length reparameterization spaces knots
(in
parameter space (page 3–1082) )basedonthe
square root of the length of each curve segment.
Chord-length reparameterization is usually the
best choice.
Unifor m—Spaces the knots uniformly.
A uniform knot vec tor has the advantage that the
curvewillchangeonlylocallywhenyoueditit.
With the other two forms of parameterization,
moving any CV can change the entire curve.
2D View—When on, displays the Edit Cur ve on
Surface dialog (page 1–1230)
,whichletsyou
create the curve in a two-dimensional (UV
)
representation of the surface.
CV Cur ve o n Sur face rollout (modification time)
Trim Controls group
Trim—When on, trims the surface against the
curve. When off, the surface isn’t trimmed.
If it’s impossible to trim with this curve, the surface
is displayed in the error color (orange by default).
For example, the curve is unusable for trimming if
it doesn’t form a closed loop.
Flip Trim—When on, tr i ms the surface in the
opposite direction.