Converts
a surface between open and closed/periodic.
Edit NURBS > Open/Close
Surfaces > 
- Surface Direction
-
The Surface
Direction options, U, V,
and Both, let you choose the direction
in which a surface is open or periodic. The following figure shows how
these options are used to close a beveled curve.
- Shape
-
Ignore does
not preserve the shape of the original selection.
Preserve adds
or deletes control points as necessary to preserve the shape of
the original surface. This option is the default setting.
Blend tries
to impose continuity on the input surfaces, using the Blend Bias
setting to determine the amount of smoothing that will take place.
NoteIf the ends are touching
and you close them with the Preserve setting
on, you might get CVs that cross over each other and cause a loop
in the surface when you move the CVs. In these situations, turn
on the Blend setting instead.
- Blend Bias
-
Alters
the amount of continuity for the new surface; higher values may
result in increased distortion of the tangency of the original surfaces.
- Insert Knot
-
This
option is available only when you select the Blend option
for Shape. It inserts a knot along the
join seam and lets you set a value for the Insert
Parameter.
- Insert Parameter
-
Controls
the amount of influence the inserted knot has on the blended shape.
- Keep Original
-
Sets
whether the original curves or surfaces are retained after Open/Close.
Selecting an isoparm to
change the periodic direction
You can select the direction
in which you want the surface to be periodic from the options window,
or you can click to select isoparms on the surface. When you do
this, you override the Surface Direction setting
in the options window.
