8

Blend Surface 1185
2.
Click one surface near the edge that you want
to connect. The edge that will be connected is
highlighted in blue. Drag to choose the other
edge you want to connect. When the edge you
want is highlighted, click and then drag to the
other surface. T he ed ge of the other surface
is a lso highlighted in blue. Drag on the other
surfacetochoosetheedgetoconnect,andthen
release the mouse button to create the blend
surface.
The surface that owns the highlighted edge is
highlighted in yellow, to help you distinguish
whichedgeyouarechoosingwhentwosurfaces
have coincident edges.
Theblendsurfaceiscreated. Changingthe
position or the curvature of either parent
surfacewillchangetheblendsurfaceaswell.
3. Adjust the blend parameters.
Inter face
While a blend surface sub-object is selected, a
rollout with the blend parameters is displayed at
the bottom of the Modif y pa nel.
Blend Surface rollout (creation 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.
Tension 2—Controls tension at the edge of the
second surface you clicked. This value has no
effectiftheedgeisacurve.
A. Tension 1=0, Tension 2=10
B. T ension 1=1, T ension 2=1
C. Tension 1=10, Tension 2=0
D. Tension 1=0, Tension 2=0
Flip End 1 and Flip End 2—Flip one of the normals
used to construct the blend. A blend surface is
created using the norma ls 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.