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626 Chapter 8: Modifiers
all sub-objects in the n ew level that touch the
prev ious selection. For example, if you select
avertex,andthenCTRL+clickthePolygon
button, all polygons using that vertex are
selected.
• To conv ert the selection to only sub-objects
all of whose source components are originally
selected, hold down both CTRL and SHIFT
as you change the level. For example, if you
convert a vertex selection to a polygon selection
w ith CTRL+SHIFT+click, the resultant
selection includes only those polygons a l l of
whose vertices were originally selected.
•
To convert the selection to only sub-objects
that border the selection, hold down SHIFT as
you change the level. The selection conversion
is inclusive, meaning:
• When you convert faces, the resulting
selection of edges or vertices all belong to
selected faces that bordered unselected faces.
Only the edges or ver tices that bordered
unselected faces are selected.
Face selec t ion (left) converted to vertex border
(center) and edge border (right)
• When you convert vertices to faces, the
resulting selection of faces had all of their
vertices selected and bordered unselected
faces. When you convert ver tices to edges,
the resulting selection contains only edges
all of whose vertices were previously selected
and only edges of faces that did not have all
vertices selected; t hat is, of faces around the
border of the vertex selection.
Vertex selection (left) converted to edge border
(center) and face border (right)
• When you convert edges to faces, the
resulting selection of faces had some but
not all of their edges selected, and were
next to faces with no edges selected. When
you convert edges to vertices, the resulting
ver tices are on previously selected edges,
butonlyatintersectionswherenotalledges
were selected.
Edge selection (left) converted to face border
(center) and vertex border (right)
Conversion commands are also available from the
quad menu.
Vertex—Accesses the Vertex sub-object level,
which lets you select a ver tex beneath the cursor;
region selec tion selects ver tices within the region.
Edge—Accesses the Edge sub-object level,
which lets you select a polygon edge beneath the
cursor; region selection selects multiple edges
within the region.
Border—Accesses the Border sub-object level,
which lets you select a sequence of edges that
borders a hole in the mesh. A border is always
composed of edges with faces on only one side of
them, and is always a complete loop. For example,
a box doesn’t normally have a border, but the
Teapot object has several of them: on the lid, on the