8

986 Chapter 9: Surface Modeling
Selection rollout
The Selection rollout provides buttons for turning
different sub-object levels on and off, working with
named selections and handles, display settings,
and information about selected entities.
When you first access the Modify panel with
an editable mesh selected, you’re at the Objec t
level, with access to several functions available as
described in
Editable Mesh (Object) (page 1–989) .
You can toggle the various sub-object levels, and
access relevant functions by clicking the buttons at
the top of the Selection rollout.
Clickingabuttonhereisthesameasselecting
asub-objecttypeintheModifierStackdisplay.
Click the button again to turn it off and return to
the O bject selection level.
The Selection rollout also allows you to display
and scale vertex or face
normals (page 3–1074)
Vertex—Turns on Ver tex sub-object level,
which lets you select a vertex beneath the cursor;
region selec tion selects vertices within the region.
Edge—Tur ns on Edge sub-object level, which
lets you select the edge of a face or polygon beneath
the cursor; region selection selects multiple edges
withintheregion. AttheEdgesub-objectlevel,
selected hidden edges are displayed as dashed
lines, allowing for more precise selection.
Face—Turns on Face sub-object level, which
lets you select a triangular face beneath the cursor;
region selection selects multiple triangular faces
within the region. If a selected face has a hidden
edge and
Shade Selected Faces isoff,theedgeis
displayed as a dashed line.
Polygon—Turns on Polygon sub-object level,
which lets you select all coplanar faces (defined by
the value in the Planar Threshold spinner) beneath
the cursor. Usually, a polygon is the area you see
within the visible wire edges. Region selection
selectsmultiplepolygonswithintheregion.
Element—Turns on E lement sub-object level,
which lets you select all contiguous faces in an
object. Region selection lets you select multiple
elements.
By Vertex—When on, and you click a vertex, any
sub-objects (at the current level) that use that
ver tex are selected. Also works with Region S elect.
Note: When By Vertex is on, y ou can select
sub-objectsonlybyclickingavertex,orbyregion.
Igno re Backfacing—When on, selection of
sub-objects selec ts only those sub-objects whose
normals are visible in the viewport. When off
(the default), select ion includes all sub-objects,
regardless of the direction of their normals.
Note: ThestateoftheBackfaceCullsettinginthe
Display p anel does not affect sub-object select ion.
Thus, if Ignore Backfacing is off, you can still select
sub-objects, even if you can’t see them.