8

616 Chapter 12: Animation
Inter face
Lengt h—Sets the number of frames for the
duration of the transition.
Transitions are calculated by matching velocities
inbothclips.Smoothoutabruptvelocitychanges
using longer transitions.
Ease In—Ease-in value for the source clip.
Ease Out—E a se-out value for the destination clip.
Source Clip and Destination Clip groups
The following options let you set different
parameters proper to both source and destination
clips involved in the transition.
Start Frame—Set the transition start frame for the
source and destination clips in their respective
fields. Duration for the source and destination
clips displays above the Start Frame fields.
•
Rolling—Keeps the clip in motion during the
transition.
•
Fixe d —For the source clip, this option freezes
motion at the Start Frame position during the
transition. For the destination clip, this option
freezes motion at the End Frame position.
If Fixed is chosen for b oth the source and
destination clips, t he transition is a gradual
interpolation from one frozen pose to another.
Velocity Blends group
A Velocity Blend object is one that has its positions
blended based on velocity (like a biped’s COM).
Objects used for Velocity Blending are most
commonly the roots of the mix hierarchy. When
you pick an object for velocity blending, its
animation will accumulate based on its trajectory
in the scene; for example, choosing the root of a
character as the blend object will ensure that the
character’s animation is transitioned relatively
from clip to clip, so the character keeps moving
through world space instead of repeating each clip
as absolute. All children of the root will follow in
the transition.
In s ome cases, you might want to use velocity
blending for a child object.
By default, the Transition Editor uses no velocity
blend objects.
Impor tant: If you use velocity blending, pick your blend
objects
before you optimize the transition.
Velocity Nodes list—
Lists the objects you have
chosen for velocity blending.
Select Velocit y Nodes—Click to display a Pick
Nodes dialog (page 2–618)
and choose the objects
to velocity blend.
Delete Velocity Nodes—Click to delete the
highlighted objects from the list.
Set Other Transition Velocity Nodes—Copies
the set of velocity blend objects to all other
transitions in the current track.
Roll—When on, accumulates the roll (X) angle
during the transition. When off, the angle is
simply blended with the next clip. Default=on.