2009

Bind Position Causes an object to attempt to maintain its location or to match
the location of a follow object.
Bind Orientation Causes an object to attempt to maintain its rotational
orientation or to match the orientation of a follow object.
Relative Changes how an object reacts to a bound follow object. See the
following discussion about binding an object to a follow object.
Axis and Weight Set these options to control which axes are affected by the
binding and the binding’s influence over other bindings in the kinematic
chain.
Binding an Object to the World
You can bind an object to the world if you want the object to hold its position
and orientation as long as possible during IK operations.
If you are animating a walking figure you want one foot to remain in place
while you position the other foot. Without binding, the whole hierarchy
would have a tendency to slide around when you attempt to position a foot.
Binding both feet to the world ensures that the unselected foot stays in place
while you position the other foot.
Binding an Object to a Follow Object
You can bind a selected object in your hierarchy to any other object that is
not a descendant of the selected object. This other object is called the follow
object.
The behavior of the bound object varies depending on the state of the Relative
buttons next to the bind options.
■ When Relative is inactive, the bound object tries to match the exact
position and orientation of its pivot point to the position and orientation
of the follow object’s pivot point.
■ When Relative is active, the bound object mimics any changes in position
or rotation of the follow object but does not try to match it exactly.
You might want to animate a figure that always points to another object. Bind
the hand of the figure to the other object with Relative active. Turn IK on,
and as you move the object, the hand and arm of the figure move to point at
it.
3424 | Chapter 15 Animation