9

990 Chapter 9: Surface Modelin g
Tar get (Ver tex lev el only )—
Turn on and dr ag f rom
one vertex to another to weld the vertices together.
The dragged vertex fuses to the target vertex.
The pixel s spinner to the right of the Target
button sets the m aximum distance in screen pixels
between the mouse cursor and the target vertex.
Extrude & Bevel group (Edge, Patch, and
Element levels only )
These controls let you extrude a nd bevel e dges,
patches, or elements. Extruding patches moves
them a long a norm al and creates new patches that
form the sides of the extrusion, connecting the
selection to the object. B eveling adds a second
step that lets you scale the extruded patches. You
can extrude and bevel patches by dragging or by
direct entry. You can also hold down the
Shif t
key during extrusion, which creates a sep arate
element.
Note: Sides created by beveling or extrusion are
assigned to smo othing g roup 1.
Extrude—Click this button, and then drag any
edge, patch, or element to extrude it interactively.
Hold down the
Shif t keyduringthisoperation
to create a new element.
When the mouse cursor is over a selected patch or
element, it changes to an Extrude cursor.
B evel (Pa tch a nd E lement l evels only )—Click this
button, and then drag any patch or element to
extrude it interactively, then click and release
the m ouse button, and dr ag again to bevel the
extrusion. Hold down the
Shi f t key during this
operation to create a new element.
When the mouse cursor is over a selected element,
it changes to a Bevel cursor.
Original patch (top) and inward and outward extrusions
Note: In some cases, particularly with closed objects (objects with
no holes or open edges), the second bevel step might not produce
visible results.
Ex trusion—This spinner sets whether the extr usion
is outward or inward, depending on whether the
val ue is positive or negative.
Outli ning (Pat ch a nd E lement l evels only )—This
spinner lets you scale selected patches or elements
bigger or smaller, depending on whether the value
is positive or negative. It is normally used after an
extrusion for beveling the extruded patches.
Nor mal—If Normal is set to Local (the default),
extrusion takes place along the normal of each
selected edge, patch, or individual patch in an
element. If normal is set to Group,extrusion
takes place along the averaged normal of each
contiguous group in a selection. If you extrude
multiples of such groups, each g roup moves along
its own averaged normal.
B evel S moothing (Pa tch a nd E lement levels
only )—
These settings let you set t he shape of