8
Editing Surface Sub-Objects 1147
Force2-SidedintheRenderingMethodpanelof
the
Viewport Configuration dialog (page 3–896)
,
or assig n a
Double-Sided Material (page 2–1400)
.
Break Row—Breaks the surface into two surfaces in
the direction of a row (the sur face’s U axis).
Break Col.—Breaks the surface into two surfaces in
the direction of a column (the surface’s V axis).
Break Both—Breaks the surface into four surfaces
in both directions.
You cannot break a trimmed surface.
Extend—Extends the surf ace by changing its
length.
Wa rni ng: Extending a surface loses all animation
controllers for the surface and its points or CVs.
Join—
J oins two surface sub-objects together. After
you have joined the surfaces in a viewport, the
Join Surfaces dialog (page 1–1234)
is displayed.
This dialog lets you cho ose the method for joining
the two surfaces. You can join only original edges
of surfaces; you
cannot
join edges c reated by
trimming.
Wa rni ng: When you join two surface sub-objects, you
lose the animation controllers for all p oint or CVs on
both surfaces.
CV Surface rollout
This additional rollout is displayed when a CV
surface is selected.
U Degr ee and V D egree—Letyousetthedegreeof
the surface in either the U or V dimension. The
higher the degree value, the greater the continuity.
Thelowerthedegree,themorediscontinuousthe
surface segments become. The degree can’t b e less
than one or greater than the number allowed by the
number of CVs in the specified dimension. D egree
3 is adequate to represent continuous surfaces, and
is stable and well behav ed. Default=3.
Setting the degree greater than 3 isn’t
recommended because higher-degrees are
slower to ca lculate and less stable numerical ly.
Higher-degrees are supported primar ily to be
compatible with models created using other
surface modeling programs.
The number of CVs in a g iven dimension must be
at least one greater than that dimension’s degree.
Automatic Re p aram eterization group
The controls in this group box let you specify
automatic reparameterization. They are simi lar to
the controls in the
Reparameterize dialog (page
1–1238)
, with the addition that all choices except
for None tell the software to reparameterize the
curve autom atically; that i s, whenever you edit it
by moving CVs, refining, and so on.
None—Do not reparameterize automatically.