8

Key Info Rollout 815
The B alance Factor determines how far the biped’s
hips will shift forward or backward to compensate
for forward or backward bending of the spine.
When the biped has a normal weight distribution
between the upper and lower body, the default
valueof1causesthehipstoswingbackwardasthe
biped bends over to compensate for the forward
weight.
At t imes, when the biped leans, you w ill want the
biped’s hips to refrain f rom shif ting to compensate
for the forward weight. This would be when the
biped is sitting or falling dow n. A Balance Factor
of 0 (the minimum value) causes the hips to stay
still when the biped leans forward or backward.
Avalueof0placesthebiped’sweightatthecenter
of mass. A value of 1 places the biped’s weight
above the center of mass. A value of 2 places the
biped’s weight i n the head. Click the spinner up
arrow to move the biped’s weight distribution
toward the head. Range=0.0 to 2.0; Default=1.
Note: Yo u c a n a l s o s h i f t t h e c e n t e r o f m a s s b y
turning on Figure m ode, selecting the center
of mass object, and using
Rubber Band mode
(page 2–791)
to move the center of mass to a new
position. T his method cannot be keyfr amed, but
it allows you to move the center of mass outside
the biped body. For example, you can simulate
pushingaheavyobjectbymovingthecenterof
mass behind the biped.
Dynamics B lend—Select the Body Vert ical t rack
(center of mass vertical track) and control the
amount of gravity in an airborne period, as in a
running or jumping motion. This parameter has
no effect on a walking motion where footsteps
overlap.
The vertical center of mass track Dynamics Blend parameter
issetto1forbothkeys(whitesquares)inthefirstjump,
and to .5 in the second jump.
Avalueof1usesthe GravAccel (page 2–833)
value to calculate gravity. A value of 0 removes the
effects of gravity calculation and flattens a jumping
or airborne motion.
Ba llistic Tension—Select the Body Vert ical track
(COM) and control the amount of spring or
tensionwhenthebipedlandsortakesofffroma
jump or run step. The change is subtle.
A walk c ycle will not activate this value. The biped
has to b e airborne,
then the Lift and Touch vertical
keys w ill display a Ballistic Tension value.
If there are more than three vertical keys during a
suppor t period, you can a lso edit Ballist ic Tension
for the lift-off key; otherwise Biped uses the
same value for touchdown and lift-off, since it is
assumed that there is o nly one vertical dip in the
motion. Low values are high tension (less dip in
the trajector y). Default=0.5; Range=0 to 1;
Prop group
TheCoordinateSpacepulldownswillsettheProp
to refer to the World, Body, Right Hand or Left