8

Dynamics & Adaptation Rollout 833
IK Only—
When on, the biped’s constrained hands
and feet are retargeted only during the f r ames on
which they are IK controlled. When off, the hands
and feet are retargeted during both IK and FK
keys. Default=off.
Dy namics & Adaptation Rollout
Select the biped. > Motion panel > Dynamics &
Adaptation rollout
The controls on the Dynamics & Adaptation
rollout let you specify the way you want to create
biped animation. The parameters let you modify
grav ity strength, dy namic proper ties for keys
generated by newly created footsteps, the number
of transform tracks available on the biped, and
prevent key adaptation.
B iped Dy na mics and S pli ne D y nami cs
These parameters specify how new biped center
of mass k eys are created and therefore how you
want to work w ith the bip ed. Turning on Spline
Dynamics will create center of mass keys, without
gravity and balance calculation, for newly created
footsteps. This may feel more familiar to new users
who are already familiar with spline interpolation.
BipedDynamicscalculatesbipedairborne
trajectory, k nee bend on landing and positions
thebipedtomaintainbalancewhenthespine
is rotated. When parameters change, the biped
adapts. Turn on Biped Dynam ics and use thi s
adaptation to your advantage.
You can always change f rom one method to the
other on a per-key basis or for the entire animation
at any time.
Interfa ce
Grav Accel—Sets the strength of the gravit at ional
acceleration used to calculate the biped’s motion.
By default, this parameter is set to accurately
simulate Newtonian gravity as found on the
Earth’s surface.
At a value of 0, the biped still runs but the feet
hardly get off t he ground.
Biped Dynamics—Creates new center-of-mass keys
using Biped Dynamics.
Keys for the center of mass (COM) Balance Factor
and Dynamics Blend parameters are set to a value
of 1. Biped calculates airborne trajectories and
biped balance.
Note: UseDynamicsBlendontheKeyInforollout
> Body group to set a vertical COM key that is a
blend between D ynamics and Spline Interpolation;
avalueof1isfullDynamics,avalueof0isfull
Spline interpolation.
Spline D ynamics—Creates new center-of-mass keys
using full spline interpolation. All new vertical
COM keys are created with Dynamics Blend=0,
and all new horizontal COM keys are created with
Balance Factor=0.