8

1186 Chapter 9: Sur face Modeling
A. No flipping
B. En d 2 is flipped.
Flip Tangent 1 and Flip Tangent 2—Flip the t angent
attheedgeofthefirstorsecondcurveorsurface.
Flipping the tangent reverses the direction in
which the blend surface approaches the parent
sub-object at that edge.
Flipping the tangent has no effect if the edge is a
curve, unless the curve is a curve on surf ace.
When you blend to a CV or point curve on surface,
the new blend surface is tangent to the surface on
which the curve on surface lies. The Flip Tangent
controls are especially usef u l in this situation.
A. Tangent 1 flipped
B. Tangent 2 flipped
Start Point 1 and Star t Point 2—Adjust the position
of the star t point at the two edges of the blend.
Adjusting the star t points can help eliminate
unwanted twists or "buckles" in the surface.
These spinners are unavailable if the edges or
curves are not closed.
While you’re adjusting start points, a dotted
blue line is displayed between them, to show the
alignment. The surface is not displayed, so it
doesn’t slow down adjustment. When you release
the mouse button, the surface reappears.
Flip Normals—Turn on to reverse the direction of
theblendsurfacenormals.
Blend Surface rollout (modification time)
"Tension" affects the tangent between a parent
surface and the blend surface. The greater the
tension value, the more closely the tangent
parallels the parent surface, and the smoother
the transition. The lower the tension, the greater
the tangent angle and the sharper the tr ansition
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.