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Link Inheritance (Selected) Utilit y 435
Link I nher itance (S elected) Uti lit y
Utilities panel > Utilities rollout > More button > Utilities
dialog > Link Inheritance (Selected)
The Link Inheritance (Selected) utilit y constrains
the links between multiple objects in a selection
set for any axis of position, rotation, or scale.
ThisutilityworksexactlythesameastheInherit
rollout (page 2–500) in the Link Info group box in
the Hierarchy panel (page 3–773),exceptthatitlets
you adjust link inheritance for multiple objects in a
selection set, while the functions in the Hierarchy
panel work only on single objects.
Procedure
To prevent the inher ita nce of X r otati on in a
hiera rchy:
• Selectoneormoreobjects,andthenturnoffX
intheRotategroupoftheInheritrollout.
Inter face
XYZ—Turn off any axis in the Move, Rotate, or
Scale groups to prevent inheritance.
When a box is turned on, transform information
from the p arent is passed on to the selected objects
for the selected axis. When a bo x is turned off,
transform information on that axis is ignored by
the selected objects.
Animating with Inverse
Kinematics (IK)
UsingIKtoanimatealeg
Inverse kinematics (IK (page 3–958))isamethod
of animating that reverses the direction of the
chain manipulation. Rather than work from the
root of the tree, it works from the leaves.
Let’staketheexampleofanarm. Toanimate
an arm using forward kinematics, you rotate the
upper arm away from the shoulder, then rotate
the forearm, the hand from the wrist and so, on
adding rotation keys for each child object.
To animate the ar m us ing inverse kinematics, you
move a goal that pos itions the wrist. The upper
and lower arms are rotated by the IK solution
which moves the pivot point of the wrist, called an
end effector (page 3–933),towardthegoal.
Inthecaseofaleg,forexample,thefootis
constrained to the floor by the goal. If you move
the pelvis, the foot stays put since the goal has not
moved,andthiscausesthekneestobend. The
entire animation is contained in keyframes for the