8

810 Chapter 14: Character Studio
• Set IK constraints and pivots for the biped
hands and feet.
When the Body Vertical Center Oof Mass track is
selected, you ca n change the ver tical dynamics of
themotion,onakey-by-keybasis.WhentheBody
Horizontal Center Of Mass track is selected you
can change the ba lance factor for shifts in weight
distribution.
Note: The areas of the Key Info rollout are divided
up into several groups: Tcb, IK, Head, Bo dy, and
Prop. These groups can be expanded or hidden by
clickingonthelinenexttotheirname.
Activating Par ameters
Groups of the Key Info rollout are unavailable
depending on what part of the biped is selected
andifakeyiscurrent. BodyVertical,Body
Horizontal, and Body Turning refer to the three
tracks used to animate the biped center of mass.
Selectoneofthethreecenterofmasstrackson
the Track Selection rollout, then use Next Key or
PreviousKeytofindakeytoedit.
• If Body Vertical is selected and a key is current,
then parameters for Dynamics Blend, Ballistic
Tension, Z Position, Time, and TCB parameters
(Tension, Continuity and Bias) are active.
Ballistic Tension is only available at keys just
before or just after an airborne state, as between
footsteps in a run or jump.
Note: TCB controls are not effective at
Body Vertical keys just before and just after
an airborne period, between footsteps, if
Dynamics Blend=1. Biped Dynamics calculates
theairbornetrajectory;inthiscase,lower
the value of Dynamics Blend to use the TCB
controls. In a walk sequence where f ootsteps
overlap, Dynamics Blend has no effect and TCB
controls can be used.
• If Body Horizontal is selected and a key is
current, the Balance Factor parameter, XY
Position, Time, and TCB parameters are ac tive.
Z Posit ion, Dynamics Blend, Ballistic Tension
are grayed.
• IfBodyRotationisselectedandakeyiscurrent,
onlytheTimeandTCBparametersareactive.
• Ifabipedhandisselectedandakeyiscurrent,
then a l l parameters are active except p ar ameters
in the Body Dynamics group.
• If a biped foot key is selected and cur rent, then
all parameters are active except for parameters
in the Body Dynamics group.
• If a biped leg is selected and a key is current,
then Time and TCB parameters are act ive. XYZ
Position and B ody D ynamics parameters are
made unavailable. In a footstep animation,
Time is made unavailable at a Touch and Lift
key.
• Ifabipedarmisselectedandakeyiscurrent,
then Time and TCB parameters are act ive. XYZ
Position and B ody D ynamics parameters are
made unavailble.
Interfa ce
Next Key-Previous Key—Find the next or
previous keyfr ame for the selected biped par t.
The field displays the key number.
Time—Enter a value to specify when in time the
key occurs.