9

684 Chapter 8: Modifiers
Lattice sub-object level, and then use any of the
transform tools to adjust the lattice volume relative
to the geometry.
Inter face
Modifier Stack
Control Points—At this sub-object level, you can
select and manipulate control points of the lattice,
one at a time or as a group (select multiple points
using standard techniques). Manipulating control
points affects the shape of the underlying object.
You can use standard transformation methods
w ith the control points. If the Auto Key button is
turned on when modifying the control points, the
points become animated.
Lattice—At this sub-object level, you c an p o sition,
rotate, or scale the lattice box separately from the
geometry. If the Auto K ey button is turned on,
the lattice becomes animated. When you first
apply an FFD, its lattice defaults to a bounding box
surrounding the geometry. Moving or scaling the
lattice so that only a subset of vertices lies inside
thevolumemakesitpossibletoapplyalocalized
deformation.
Set Volume—At this sub-object level, the
deformation lattice control points turn green,
and you can select and manipulate control points
w ithout affecting the modified object. This lets you
fitthelatticemorepreciselytoirregular-shaped
objects, giving you finer control when deforming.
Set Volume essentially lets you set the init ia l state
ofthelattice.Ifyouuseitafteryouhaveanimated
a control point or when the Auto Key button is
turnedon,thenitworksthesameasattheControl
Points sub-object level, deforming the object as
you manipulate points.
For more information on the stack display, see
Modifier Stack (page 3–760).
FFD Parameters rollout
Display group
Affects the display of the FFD in the viewports.
Lattice—Draws lines connecting the control points
to make a grid.
Although the viewports can sometimes become
cluttered when these lines are drawn, it helps to
visualize the lattice.