9

1184 Chapter 9: Surface Modeling
parallels the parent surface, and the smoother
thetransition.Thelowerthetension,thegreater
thetangentangleandthesharperthetransition
between parent and blend.
Tension 1—Controls tension at the edge of the first
surface you clicked. This value has no effect if the
edge is a curve.
Tension 2—Cont rols tension at the edge of the
second surface you clicked. This value has no
effectiftheedgeisacurve.
A. Tension 1=0, Tension 2=10
B. Tension 1=1, T ension 2=1
C. Tension 1=10, Tension 2=0
D. Tension 1=0, Tension 2=0
Flip End 1 a nd Flip End 2—Flip one of the normals
used to constr uct the blend. A blend surface is
created using the normals of the parent surfaces.
If the two parents have opposing normals, or
if a curve has the opposite direction, the blend
surface can be shaped like a bow tie. To correct
the situation, use Flip End 1 or Flip End 2 to
construct the blend using a normal opposite the
corresponding parent surface’s normal.
A. No flipping
B. End 2 is flipped.
Flip Tangent 1 a nd Flip Tangent 2—Flip the tangent
attheedgeofthefirstorsecondcurveorsurface.
Flipping the tangent reverses the direction in
which the blend surface approaches the paren t
sub-object at that edge.
Flipping the t angent has no effect if the edge is a
curve, unless the curve is a curve on surface.
WhenyoublendtoaCVorpointcurveonsurface,
the new blend surface is tangent to the surface on
which the curve on surface lies. The Flip Tangent
controls are especially useful in this situation.
A. Tangent 1 flipped
B. Tangent 2 flipped