8

Editable Patch Surface 953
When the weld occurs, the anchor patch
remains fixed while the other patch moves to
make the weld.
To crea te a new element, do one of the following:
•SHIFT+dragoneormorepatches.
• SHIFT+extrude one or more patches.
• SHIFT+extrudeoneormoreedges.
•SHIFT+draganelement.
Inter face
Selection rollout
The Selection rollout provides buttons for
select ing the sub-object level, working with named
selections, display and filter settings, and displays
information about selected entities.
Editable Patch has five levels of sub-object editing:
Vertex,Handle,Edge,Patch,andElement.The
selection you make at each level appears in the
viewport as a component of the patch object. Each
level m aintains its own sub-object selection. When
you return to a level, the selec tion reapp e ars.
Clicking a button here is the same as clicking a
sub-object type in the Modifier Stack rollout.
Click t he button again to turn it off and return to
the object selection level.
Vertex—Lets you select vertex control points
and their vector handles on a patch object. At this
level, vertices can be welded and deleted.
By default, a transform gizmo or axis tripod
appears at the geometric center of the selected
vertices. If you turn on
Gizmo Preferences (page
3–877)
> Allow Multiple Gizmos, however, g izmos
or t ripods appear at all selected vertices.
Vector handles appear as small green squares
around selected ver t ices. Also, with cert ain objects
you may see interior vertices represented as yellow
squares.
Handle—Lets you select vector handles
associated with each vertex. This level lets you
manipulate the handles w ithout needing to deal
with vertices.
A Transform gizmo or axis tripod appears at the
geometric center of the selected handles.
A t this level, vector handles appear as small green
squares around all vertices. Also, with certain
objects you may see interior vert ices represented
as yellow squares.
Edge—Selects a bounding edge of the patch
object. At this level, edges can be subdivided, and
new patches added to open edges.
A Transform gizmo or axis tripod appears in the
middle of a single selected edge. For multiple
selected edges, the icon is at the select ion center.
Patch—Selectsanentirepatch.Atthislevel,
apatchcanbedetached,deleted,oritssurface
subdivided. When a patch is subdivided, the