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462 Chapter 12: Animation
IK Display Options rollout
The options on this rollout set the display of twist
manipulators and the IK chain object.
Twist Start group
Enabled—Turns on the display of the start tw ist
manipulator. D efault=on.
Size—Setsthesizeofthestarttwistmanipulator.
Default=1.0.
Lengt h—Sets the length of the start tw ist
manipulator. Default=75.0
Twist End group
Enabled—Turns on the display of the end twist
manipulator. D efault=on.
Size—Sets the size of the end twist manipulator.
Default=1.0.
Lengt h—Sets the length of t he end twist
manipulator. Default=75.0.
Goal Display group
Enabled—Turns on the display of the IK goal.
Default=on.
Size—Sets the size of t he IK goal. Default=30.0.
IK Solver Di splay group
Enabled—Turns on the display of the IK chain
object. Default=off.
See also
Animating with the Spline IK Solver (page 2–455)
Interactive and Applied IK
Animating with Interactive IK
Select the end o f a hierarchy > Hierarchy panel > IK >
Interactive IK.
With Interact ive IK and the Auto Key button
turned on, you position your model on keyframes,
and the IK solution is interpolated between those
keyframes. Because the IK solution accounts for
multiple objects and the joints between objects, the
interpolated animation of an IK object is usually
different f rom the animation of objects without IK.
Tip: InteractiveIKisafeaturecarriedoverfromthe
earliest version of the software. It is recommended
that you explore the IK Solver methods first, and
only use Interactive IK if you find the IK Solvers
will not satisfy your needs.
ExampleofInteractiveIK
Thefollowingexampledemonstrateshowan
int eractive IK animation works and how it might
differ from what you expect. The fi gure shows an
IK str ucture with its end effector rest ing on top of