8

1120 Chapter 9: Sur face Modeling
Surf ace Trims—
When on, displays surface
trimming (page 1–1082)
. When turned off,
displaystheentiresurface,evenifit’strimmed.
Keyboard shortcut (while Keyboard Shortcut
Override Toggle is on): CTR L+SHIF T +T
Transform D eg rade —When on, transforming a
NURBS surface can deg r ade its display in shaded
viewports, to save time. This is similar to the
Degradation O verr ide (page 1–34) button for
playing animations. You can turn off this toggle so
surfaces are always shaded while you transform
them, but transforms can take longer.
Keyboard shortcut (while Keyboard Shortcut
Override Toggle is on): CTRL+X
Tip: You can togg le CTRL+X during a tr ansform,
as well as before you begin the transform.
NURBS Creation Toolbox—Tur n on to display
the NURBS sub-object creation toolbox. See
Using
the NURBS Toolbox to Create Sub-Objects (page
1–1085)
.
Keyboard shortcut (while Keyboard Shortcut
Override Toggle is on): CTR L+T
Sur face Display group
This group box, for surfaces only, lets you choose
how to display surfaces in viewports.
Tessellated Mesh—When chosen, NURBS surfaces
displayasfairlyaccuratetessellatedmeshesin
shaded viewports. In w ireframe v iewports,
they appear as either iso curves or w ire meshes,
depending on the sett ings you’ve chosen on the
Display Line Parameters rollout (page 1–1120) .
Shaded Lattice—When chosen, NURBS surfaces
appear as shaded lattices in shaded viewports.
Wireframe viewports display the surface’s lattice
without shading. A shaded lattice shades the
CV
control lattice (page 3–1017) of the NURBS
surface. This displays more quickly than a
tessellat ed mesh. The shading is not accurate.
It gives you a fairly good idea of lofts, but is less
accurate for free-form surfaces. The shading is
always as large or larger t han the actua l surface,
because of the
convex hull property (page 3–1018) .
Shaded lattice display doesn’t show
surface
trimming (p age 1–1082)
or texture mapping.
Tip: Shaded Lattice is a good option to choose when
you use the modifier stack w ith
nonrelational
NURBS surfaces (page 1–1118)
.
Keyboard shortcut: ALT+L
(You can use this keyboard shortcut without
having to turn on the Keyboard Shortcut Override
Toggle.)
Display Line Parameters for
NUR B S S urf aces
Select NUR BS o b ject. > Mo dify panel > Display Line
Parameters rollout
These par ameters are contained on a single rollout
at the top level of a NURBS object.
Interf ace