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764 Chapter 8: Modifiers
all sub-objects in the new level that touch the
prev ious selection. For example, if you select
avertex,andthen
Ctrl +click the Polygon
button, al l polygons that use that vertex are
selected.
• To convert the selection to only sub-objects
all of whose source components are originally
selected, hold down both
Ct rl and Shif t
as you change the level. For example, if you
convert a vertex selection to a polygon selection
with
Ctrl+S hi ft +click, the resultant selection
includes only those polygons all of whose
vertices were orig inally selected.
Vertex—Selects a vertex beneath the cursor;
region selection selects vertices within the region.
Edge—Selects a polygon edge beneath the
cursor; region selection selects multiple edges
within the region.
Border—Turns on B orde r sub -obje ct mode,
which lets you select an area on a mesh that can
generally be described as a hole. Areas like this are
usually sequences of edges with faces on only one
side. For example, a box doesn’t h ave a border, but
the Teapot object has several of them: on the lid,
on the body, on the spout, and two on the handle.
If you create a cylinder, then delete the top face,
the top row of edges forms a border.
When the Border sub-object level is active, you
can’t select edges that aren’t on borders. Clicking a
single edge on a border selects that whole border.
Borders can be capped (either in editable poly or
by applying the cap holes modifier). They can also
be connected to another object (compound object
connect).
Polygon —Selects all coplanar polygons
beneath the cursor. Usually, a polygon is the area
you see w ithin the visible wire edges. Region
selection selects multiple polygons within the
region.
Element—Selects all contiguous polygons in
an object; region selection selects the same.
By Vertex—Selects any sub-objects at the current
level that use a vertex you click. Applies to all
sub-object levels except Vertex. A lso works with
Region Select.
Ignore Backfaces—Selecting sub-objects selects
only those whose normals make them v isible in the
viewport. When turned off (the default), selection
includes all sub-objects, regardless of the direction
of their normals.
Note: The state of the Display proper ties (page 1–55)
> Backface Cull setting doesn’t affect sub-object
selection. Thus, if Ignore Backfacing is turned off,
you can select sub-objects even if you can’t see
them.
Note: ThestateoftheIgnoreBackfacescheckbox
alsoaffectsedgeselectionattheEdgesub-object
selection level.
Shrink—Reduces the sub-object selection area
by deselecting the outermost sub-objects. If
the s election size can no longer be reduced, the
remaining sub-objects are deselected.
Grow—Expands the selection area outward in all
available directions.
Forthisfunction,aborderisconsideredtobean
edge selection.
With Shrink and Grow, you can add or remove neighboring
elements from the edges of your current sele ction. This works
at any s ub-object level.
Ring—Expandsanedgeselectionbyselectingall
edges p ara l lel to the selected edges. Ring applies
only to edge and border selections.