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FFD Soft Bodies 787
Pr ocedur es
To create an FFD soft body:
1.
Create the mesh to use as the basic,
non-deformed state of your soft body.
2. Apply an FFD modifier: the FFD 2x2x2, 3x3x3,
4x4x4 (page 1–683) or FFD(box) (page 1–685)
modifier.
Different FFD dimensions produce different
behavior. When us ing FFD(box), set the
dimensions to a number that leaves the FFD
vertices evenly distributed over the lattice. You
can also use the Conform To Shape command
to make the FFD lattice better represent the
underlying geometry.
3. Apply the reactorSoftBodymodifier(page
2–784) on top of the F F D mo difier.
4. in the Properties rollout of the Soft Body
modifier, choose F FD-Based.
Youcannowaddthebodytoasoft body
collection (page 2–788) and simulate it as an
FFD soft body.
Inter face
FFD Options
FFD-based—Specifies that you want to simulate
this body as an FFD soft bo dy.
Stable Configuration—Here you can specify
which configuration (position of vertices) reactor
considers to be the stable (non-deformed)
configuration. The FFD soft body will tend to
maintain that configuration.
•
Original B ox—The stable configurat ion for an
FFD soft body is the original, non-deformed
FFD b ox; any animation or modification of the
latticeisignored.Thisisthedefaultoption.
•
Fr ame—Lets you specify the state of the FFD
state at a par ticular keyframe as the stable
configuration for the object.
Animate Transform—When on, reactor animates
both the FFD lattice and the transformation of
the object. In some situations, the deformation
calculated by the FFD modifier is more consistent
if the object transformation follows the FFD lattice.
Impor tant: Use this option only when the FFD en closes
theentiremeshoftheobject,asthetransformation
applies to the whole mesh; that is, the whole object will
be transformed.
Not animating the
object transform can cause the FFD modifier
to apply strange deformations.
Animating the object transform (turning on Animate
Transform) fi
xes the problem.