8

Adjusting Vertical Motion 739
Ballistic Tension can range from 0 to 1, with 0.5
as the default value. Increasing Ballist ic Tension
to 1.0 m akes the legs stiffer at takeoff or landing.
Decreasing the tension to 0.0 makes the legs
springier and less stiff.
Ballistic tension determines spri ngine s s of landing.
(Left = 0.0, Right = 1.0)
Dynamics Blend
The Dynamics Blend parameter in the Dynamics
& Adaptation rollout (page 2–833)
determines
whether biped dy nam ics or spline dynamics will
be used during airborne periods.
With
biped dynamics (page 3–1010) , the height
and trajectory of the biped during airborne
periods is determined by gravity calculations and
other biped-specific information.
With
spline dy namics (page 3–1109) ,the
airborne height and trajectory are not set for you
automatically ; you must set them manually w ith
keyframes.
When Dynamics Blend is set to 1, biped dynamics
are used. At 0, spline dynamics are used. You
can animate this value to switch between the two
during your animation.
Procedures
To loca te vertical center of mass k eys:
1.
Select any par t of the biped and access
the Motion panel.
2. On the Track Select ion rollout, click Body
Ve r t i c a l .
3. Use the Next Key and Previous Key
buttons on the Key Info rollout to jump to the
next or previous center of mass Body Vertical
keyframes.
Tip: If the selected vertical COM key is a
touchdown key from an airborne period, you
can change the Ballistic Tension parameter on
the Key Info rollout to control knee bend. Turn
on Trajectories on the Display rollout to view
how chang ing parameters affects the t rajectory.
To set a Body Vertical key:
1.
On the Track Selection rollout, click Body
Ve r t i c a l .
2. Turn on Auto Ke y.
3. Click Select and Move on the main
toolbar.
4. Click and drag the center of mass up or down
in the viewports.
The biped is repositioned vertically, a key is
created in the center of mass Bo dy Vertical
track.
To set ballistic tension:
1.
On the Biped rollout, turn off Footstep
Mode if necessary.
2. in the Track Selection rollout, select the
biped’s Body V
ertical track.