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884 Chapter 8: Modifiers
Modifier Stack display
Normally, when you apply U nwrap UVW to
an object, the modifier stack provides access to
Vertex, Edge, and Face sub-object levels. These
are synchronized with the corresponding selection
modes on the Edit UVWs dialog (page 1–888).The
Vertex and Edge sub-object levels are useful for
making UVW vertex and edge selections in the
v iewports, where texture mapping on the object
surfaceismorereadilyvisible,andtheEdgelevelis
also useful for setting up edge selections that you
can later con vert to pelt seams.
If you apply U n wrap UVW to an active face
selection of an Editable/Edit Mesh/Poly object,
or to an active patch selection of an Editable/Edit
P atch object, no sub-object levels are available in
the Unwr ap UVW modifier. You can use Unwrap
UVW to edit only the selection that was act ive
when you applied the modifier. Changing the
sub-objectselectionintheobjectdoesn’taffectthe
Unwrap modifier contents, because the modifier
obtains the face selection when you first apply it.
All three sub-object levels are synchronized
between the modifier stack and the Selection
Modes group (page 1–893) on the Edit UVWs
dialog. When you ac tivate a sub-object level in
one, it’s also activated in the other. Sim ilarly,
selecting sub-objects in a viewport selects them in
the editor and vice-versa.
Selec tion Parameters rollout
Use these sett ings to make or modify a sub-object
selection for use by the mo difier. If you’ve passed
afaceselectionupthestack,forexamplefrom
the Poly Selec t modifier, Unwrap UVW uses that
instead, and makes these controls unavailable.
+ button—Expands the selection by selecting all
faces adjacent to selected faces.
-button—Reduces the selection by deselecting al l
faces adjacent to non-selected faces.
Ring—Expandsanedgeselectionbyselectingall
edges p ara l lel to the selected edges. Ring applies
only to edge selections.
Loop—Expands the selection as far as possible, in
alignment with selected edges. Loop applies only
to edge selections, and propagates only through
junctions of even numbers of edges.
Ignore Backfacing— When region selecting,
prevents the selection of faces not visible in t he
view por t.
Select B y Element—Lets you select elements (page
3–933).
Planar Angle—Lets you selec t contiguous coplanar
faces with one click. Turn this on, and then set the
threshold ang le value that determines which faces
are coplanar. Then click a face to select it and all