8

448 Chapter 12: Animation
IK rotation, add a Rotation end effector, and then
use the Rotate tool to rotate the end effector.
End E ffector Parent—Links an end effector to
another object in the scene. Since end effectors
are not, in themselves, objects, you won’t see this
linkage in Track View, but the lin ked end effector
w ill inherit the transformations of its parent.
Note: Apart from the root object, you can’t link an
end effector to an object in the hierarchy because it
would create an endless loop . The position of all
objects in the hierarchy depends on the position of
the end effector, so the end effector can’t depend
onthepositionofanobjectinthehierarchy.
End Effector (Display)—Displays the name of the
selected parent object.
Link —Makes a selected object a parent of the
currently selected link.
Unlink—Unlinks the currently selected end effector
from its parent.
Remove IK group
Delete Joint—Deletes any selection of bones or
hierarchical objects. Doesn’t delete the IK; only
the selected hierarchical members.
Note: Using the DELETE key will delete the entire
hierarchy.
Remove IK Chain—Deletes the IK Solver from the
hierarchy. Doesn’t delete the objects or bones, only
the IK controls.
Positi on—Displays the Key Info para meter rollouts
specific for a Position end effector. This option is
not active if no Position end effector is assigned.
(The Key Info parameters are the same as those
used for any Position cont roller.)
Rotation—Displays the parameters for an assigned
Rotation end effector. This option is not active if
no Rotation effector is assigned. (The Key Info
parameters are the same as those used for any
Rotation controller .)
Wo rking with Join ts
S etti ng Joint R esist ance a nd
Spring Back (HD Solver)
You control a joint’s resistance to motion, and
its tendency to return to its original pos ition, by
setting Ease, Damping, and Spring Ba ck options.
Moving telescopes with and without damping
Ea sing a Joi nt at It s Limi ts
An organic joint, or a worn mechanical joint,
moves freely in the middle of its range of motion
but moves less freely at the extremes of its range.
Use Ease to cause a joint to resist mot ion as it
approaches its From and To limits.
Forexample,yourforearmmightmovefreelyin
themiddleofitsrangeofmotion,butitresists