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1054 Chapter 9: Surface Modeling
the drop ar row and choose a sub-material from
the list. The sub-objects that are assigned that
material are selected. If an object does not have
a Multi/Sub-Object material assigned, the name
list is unavailable. Likewise, i f multiple objects
areselectedthathaveanEditPatch,EditSpline,
orEditMeshmodifierapplied,thenamelistis
inactive.
Note: Sub-material names are those specified in the
Name column on the material’s Multi/Sub-Object
Basic Parameters rollout; these are not created by
default, and must be specified separately from any
mater ial names.
Clear S electi on—When on, choosing a new ID or
material name deselects any previously selected
sub-objects. When off, selections are cumulative,
so new ID or sub-material name selections add to
the existing selection set of patches or elements.
Default=on.
Smoothing Groups group
Use these controls to assign selected polygons to
different smoothing groups (page 3–1013),andto
select polygons by smoothing group .
To assign polygons to one or more smoothing
groups, select the polygons, and then click the
number(s) of the smoothing group(s) to assi gn
them to.
Select B y SG (S moothing G roup)—Displays a dialog
that shows the current smoothing groups. Select
a group by clicking the corresponding numbered
button and clicking OK. If Clear S elect ion is
on, any previously selected polygons are first
deselected. If Clear Selection is off, the new
selection is added to any previous select ion set.
Cle ar Al l—Removesanysmoothinggroup
assignments from selected polygons.
Auto Smooth—Sets the smoothing groups based
on the angle between polygons. Any two adjacent
polygons will be put in the same smoothing group
if the angle between their normals is less than the
threshold angle, set by the spinner to the right of
this button.
Threshold—This spinner (to the right of Auto
Smooth) lets you specify the maximum angle
betweenthenormalsofadjacentpolygonsthat
determines whether those polygons wi l l be put in
the same smoothing group.
Edit Vertex Colors group
Use t hese controls to assign the color, illumination
color (shading), and alpha (t ransparenc y) values
of vertices on selected polygons or elements.
Co lor—Click the color swatch to change the color
of vertices on selected polygons or elements.
Illumination—Click the color swatch to change the
illumination color of vertices on selected polygons
or elements. This lets you change the illumination
without changing the vertex’s color.
Alpha—Lets you assig n an alpha (transparency)
value to vertices on selected polygons or elements.
The spinner value is a percentage; zero is
completely transparent and 100 is completely
opaque.
Subdivision S urface rollout
See Inter face (page 1–1061) for information on the
Subdivision Surface rollout settings.
Subdivision Displacem e nt rollout
See Inter face (page 1–1063) for information on the
Subdivision Displacement rollout sett ings.
Paint Deformation rollout
Paint Deformation lets you stroke eleva ted and
indented areas directly onto object surfaces. For
more information, see Pa in t Deformation Rollout
(page 1–1064).