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Edit Poly Modifier 627
body, on the spout, and two on the handle. If you
create a cylinder and then delete one end, the row
of edges around that end forms a circular border .
When Border sub-object level is active, you can’t
select edges that aren’t on borders. Clicking a
single edge on a border selects the whole b order.
Youcancapaborder,eitherinEditPolyorby
applying the
Cap Holes modifier (page 1–550) .
You can also connect borders between objects with
the
Connect compound object (p age 1–323) .
TheEdgeandBordersub-objectlevelsare
compatible, so if you go from one to the other , any
existing selection is retained.
Polygon—Accesses the Polygon sub-object
level, which lets you select polygons beneath the
cursor. Region selection selects multiple polygons
within the region.
Element—Turns on Element sub-object level,
which lets you select all contiguous polygons in an
object. Region select ion lets you select multiple
elements.
The Polygon and Element sub-object levels are
compatible, so if you go from one to the other , any
existing selection is retained.
Use Sta ck S election—When on, Edit Poly
automatically uses any existing sub-object
selection passed up the stack, and prevents you
from manually changing the selection.
By Vertex—When on, you can select a sub-object
only by selecting a vertex that it uses. When you
click a vertex, all sub-objec ts that use the selected
vertex are selected.
Igno re Backfacing—When on, selection of
sub-objects affects only those facing you. When
off (the default), you can select any sub-object(s)
under the mouse cursor, regardless of v isibility or
facing.Ifmultiplesub-objectslieunderthecursor,
repeated clicking cycles through them. Likewise,
w ith Ignore Backfacing off, region selection
includes all sub-objects, regardless of the direction
they face.
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.
By Angle—When on, if you select a polygon,
the software also selects neighboring polygons
based on the angle setting to the right of the
check b ox. This value determines the maximum
angle between neighboring polygons that will be
selected. Available only at the Polygon sub-object
level.
For example, if you click a side of a box and the
angle value is less than 90.0, only that side is
selected, because all sides are at 90-degree angles to
each other. But if the angle value is 90.0 or greater,
all sides of the box are selected. This function
speeds up selection of contiguous areas made up
of polygons at similar angles to one another. You
can select coplanar polygons with a single click at
any angle va lue.
Shrink—Reduces the sub-object selection area
by unselecting the outermost sub-objects. If
the selection size can no longer be reduced, the
remaining sub-objects are unselected.
Grow—Expands the selection area outward in all
available directions.
Forthisfunction,aborderisconsideredtobean
edge select ion.