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492 Chapter 12: Animation
Turn on Terminator to stop calculation of the
kinematic chain before it reaches the root object
of the hierarch y. A terminator object stops
calculation at the terminator’s child object; the
terminator itself is not affected by the IK solution.
This gives you very precise control over the
behavior of the kinematic chain.
Position/Or ientation/B ind to
Follow Ob ject ( H D So lver)
Make a selection with an HD Solver applied. >
Hierarchy pan el > IK > Object Parameters rollout >
Position/Orientation/Bind to Follow Objec t groups
Use the controls in these group boxes to bind
objectsinaHDIKchaintotheworldortofollow
objects. Use the var ious options to modify the
behavior of the bindings.
Use weighted and axis-specific binding controls
to create different weights for each binding, and
to specif y w hich axes the bound follow object
influences. Use the R (Relative) buttons to
establish a relative offset with Bind Position and
Bind Orientation.
Binding an Object to the World
Binds an object to the world if you want the object
to hold its position and orientation as long as
possible during IK operations.
B inding an Object to a Follow Object
Binds a selected object in your IK chain to an y
other object t hat is not a descendant of the selected
object. This other object is called the follow object.
Pr ocedur es
To bi nd an obj ect to the wor ld:
1.
Select the object to be bound.
2. Click IK in the Hierarchy p anel and expand the
Object Parameters rollout.
3. Select one or both of t he Bind boxes.
• TurnonBindPositiontocausetheobjectto
attempt to maintain its current location.
• TurnonBindOrientationtocausethe
object to attempt to maintain its current
orientation.
To bind an object to a follow object:
1.
Turn on B ind a nd s elect t he obj ect in a
kinematic chain to be bound.
Moving your mouse over an acceptable target
will change the cursor to a push-pin icon.
2. Drag to the follow object and release.
3. Turn on Bind Orientation if you want the
bound object to match the rotation of the follow
object. Bind Position is automatically selected.
Turn off a n axi s (Ax is: XYZ ). T he specified ax is
is no longer influenced by the follow object or
the New IK Position end e ffector.
Use Weight to set the relative influence of
multiple follow objects or end effectors, and
thus their priority in solving the I K solution.
The hig her the relative Weight value, the hig her
the priority.
Note: As you drag, a dotted line is drawn from
the pivot point of the selected object to the
cursor. When the cursor is over a valid follow
object, it changes to a push-pin cursor. Release
to set the follow object. The nam e of the follow
object will appear in the text area.
To unbind an object:
• Select the object to unbind, and then click
Unbind.
Inthetextarea,thenameofthefollowobjectis
replaced with the word "None."