9

Key Info Rollout 959
The default setting distributes the cur ve e venly to
both sides of the key.
IK group
This group lets you set IK keys and adjust
parameters for IK keys.
Note: You can now make and adjust settings
for multiple selected IK-capable biped parts. For
example, say at the sa me frame one foot has a
planted key and the other has a sliding key. This
means t hey both have ( by default) IK Blend values
of 1.0 and Ankle Tension values of 0.0. If you select
both feet, a ll of the Key buttons near t he top of the
Key Info rollout are available, and you can change
IK Blend and An kle Tension values for both.
IK B lend—Determines how the software mixes
forward kinematics and inverse kinematics to
interpolate an intermediate position. An example
offorwardkinematicsismovingthearmtocontrol
the hand. An example of inverse kinematics is
moving the hand to control the arm.
Activateswhenabipedarmorleg(handandfoot)
key is current.
•0withBody chosen is normal biped space
(for ward kinematics).
•1withBody chosen is inverse kinematics, which
creates more straight-line motion between
biped keys.
•1withOb ject chosen, but no IK Object specified,
puts the limb fully into world space.
•1withObject chosen and an IK Object specified
puts the biped limb into the coordinate space of
the selected object; the biped limb follows the
specifie d object.
Ank le Tension—Adjusts the precedence of the
anklejointoverthekneejoint.Whensetto0,the
knee takes precedence. When set to 1, the ankle
takes precedence.
This effect is only visible between keyframes.
Select Pivot—Activate to designate pivots around
which the biped hands and feet should rotate.
After clicking a pivot in the viewports, turn off
Select Pivot and then rotate the hand or foot.
Select Pivot is available only if the biped hand or
foot is in World or Object coordinate space (page
1–443).
Piv ot S election Dia log—Opens a small
dialog that shows the c urrent pivot for the selected
limbonthelimb’srespectivehandorfoot,andlets
you change it. When the chart is green (or blue)
andred,indicatingthatyou’reonanIKkey,the
red dot indicates the current location of the pivot.
To designate a different pivot, click another dot on
thechart.Thisprovidesanalternativemethodto
using Select Pivot (see preceding).
The dialog is named according to the displayed
hand or foot, depicts the actual number of digits
and joints in u se, a nd resizes itself accordingly.
The displayed chart uses three different schemes,
depending on the context:
• green/blue and red dots for the right/left hand
or foot when on an IK key (pivot is editable)
• grayandwhitedotswheninanIKperiodbut
notonakey(pivotisvisiblebutnoteditable)
• nodotsifyou’reinanFK(forwardkinematics)
period,ornolimbormultiplelimbsareselected
(dialog disabled; no relevant data exists)
Theseareshowninthefollowingillustration: