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Display Line Parameters for NURBS Surfaces 1119
Shaded L attice—
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 3–923) of the NURBS surface.
This displays more quickly than a tessellated mesh.
The shading is not accurate. It gives you a fairly
goodideaoflofts,butislessaccurateforfree-form
surfaces. Theshadingisalwaysaslargeorlarger
than the actual surface, because of the convex hull
property (page 3–924).
Shaded lattice display doesn’t show surface
trimming (page 1–1080) or texture mapping.
Tip: Shaded L attice is a good option to choose
when you use the modifier stack with nonrelational
NURBS surfaces (page 1–1116).
Keyboard shortcut:
Alt+L
(You can use this keyboard shortcut without
having to turn on the Keyboard Shortcut Override
To g g le.)
Display Line Parameters for
NUR B S Su r f aces
Select NURBS object. > Modify panel > Display Line
Parameters rollout
These parameters are contained on a single rollout
at the top level of a NURBS object.
Inter face
ULinesandVLines—The number of lines used to
approximate the NURBS surface in viewports,
along the surface’s local U and V dimensions,
respectively. Reducing these values can speed up
thedisplayofthesurface,butreduceaccuracy
of the display. Increasing these values increases
accuracy at the expense of time. Setting one of
these values to 0 displays only the edge of the
object in the corresponding dimension.
Iso and mesh displays of a NURBS teapot
Iso Only—When chosen, all viewpor ts display iso
line (page 3–959) representations of the surface.
Iso(parametric) lines are similar to contour lines.
ThelinesshowwheretheNURBSsurfacehas
a constant U value or V value or both. Iso line
representations can be less crowded and easier to
visualizethanwiremeshrepresentations.
Iso and Mesh—( The default.) When chosen,
wireframe viewports display iso line
representations of the sur face, and shaded
view por ts display the shaded surface.
Mesh Only—When chosen, wireframe viewports
display the surface as a wire mesh, and shaded
viewports display the shaded surface. In wireframe
viewports, this option lets you see the surface
approximation (page 1–1239) used for view por ts.