8

664 Chapter 8: Modifiers
3–1022) become visible as dashed lines in
wireframeandedged-facesviews.InTurnmode,
click a diagonal to change its position. To exit Turn
mode, right-click in the viewport or click the Turn
button again.
Each diagonal has only two available positions
at any given time, so clicking a diagonal twice in
succession simply returns it to its ori ginal position.
But changing the position of a nearby diagonal
can make a different alternate position available
to a diagonal.
Edit Geom e try rollout
Repeat Last—Repeats the most recently used
command.
For example, if you extrude a polygon, and want to
apply the same extrusion to several others, select
the others, and then click Repeat Last.
You can apply a spline ex trusion of a single polygon (left)
repeatedly to other single polygons (1) o r to multiple
polygon selections, contiguous (2) or not (3).
Note: Repeat Last does not repeat all operations.
For instance, it does not repeat transforms. To
determine which command will repeat when you
click the button, check the button’s tooltip. If no
tooltip appears, nothing wil l happen when it is
clicked.
Co nstraints—Lets you use existing geometry to
constrain sub-object transformation. Use the
drop-down list to choose the constraint type:
• None: No constraints.
• Edg e: Constrain transformed sub-objects to
edge boundaries.
• Face: Constrain transformed sub-objects to
face surfaces.
Note: The C onstraints setting persists at all
sub-object levels.
Preser v e UVs—When on, you can edit polygons
and elements without affecting the object’s UV
mapping. You can choose any of an object’s
mappingchannelstopreserveornot;seePreserve
UVs Settings, follow ing. Default=off.
W ithout Preserve UVs, there is always a direct
correspondence between an object’s geometry and
its UV mapping. If you map an object, and then
move polygons, the texture moves along with the
sub-objects, whether you want it to or not. If you
turn on Preserve UVs, you can perform minor
editing t asks without changing the mapping.