2009

When Selected Displays the axis rod and joint limits only on selected joints.
TIP The joint icons can be difficult to see when the bones are linked to mesh
objects. When animating a bone-based hierarchy, you can hide all of the objects
and display and animate only the bones, which makes the joint icons more visible.
This is easily done by hiding geometry by category in the Display branch.
End Effectors group
With the options in this group, you can add or delete Position or Rotation
end effectors for any joint. Options affect only the currently selected joint.
An end effector is the object that the IK chain follows to come to a solution.
There are two types of end effectors: Position and Rotation. Both are displayed
as three intersecting blue lines at the joint. When you select a joint that carries
either or both end effectors and perform a transformation matching the type
of end effector, only the end effector itself is transformed. The objects in the
chain then use IK to follow and create the IK solution.
When you transform a joint that does not have an end effector (or perform
a type of transform that doesn't match the assigned end effector), you
transform the joint itself and alter its initial state.
Position Creates or deletes Position end effectors. If the node already has an
end effector, only the Delete button is available.
Create Creates a Position end effector for the selected node.
Delete Removes the Position end effector from the selected node.
Rotation Works like the Position buttons, except Rotation end effectors are
created rather than Position end effectors. When you want to solve for IK
rotation, add a Rotation end effector, and then use the Rotate tool to rotate
the end effector.
3430 | Chapter 15 Animation