8

310 Chapter 12: Animation
MasterBlock Subtrack s
Below the main MasterBlock track are subtracks.
ThefirstoftheseisalwaysBlend.Theremaining
subtracks are initially copies of the tracks used to
create the block.
Blend track—Lets you animate the influence of
the block. You can reduce the block’s influence
by creating Blend keys with values less than 1.0.
Default=1.0.
Block -specific subtrack s—Display the block name
and its asso ciated tracks. Initial ly these are copies
of the tracks used to create the block. You can edit
keysonthesetrackstochangetheblock’sbehavior.
B lock Key Pr oper t ies Dial og
Relative Motion—Toggles between relative and
absolute motion.
Start, End—Setthefirstandlastframesfor
this inst ance of the block (this scales the block
instance).
B ool ean Control ler
Maintoolbar>CurveEditor(Open)>Selectatrack
containing a float value in the Track View hierarchy >
Track View menu bar > Controlle r menu > Assign >
Boolean c ontroller
Graph Editors > Track View – Dope Sheet > Select a
track containing a float value in the Track View hierarchy
> Track View menu bar > Controller menu > Assign >
Boolean c ontroller
The Boolean controller is similar to the On/Off
controller (page 2–339)
. By default, it is assigned
totracks(suchasanobject’sVisibilitytrack)that
provide only binary on and off control.
Note: The Boolean controller is useful for
controlling the
Enabled state in the History
Independent (HI) IK system (page 2–435)
.
It differs from the On/Off controller in two ways:
first, each key has its own float value, either
1.0 or
0.0
, signifying its on or off state. This enhancement
leads to the second component that differentiates
the Boolean controller from its On/Off cousin:
the ability to lay down sequential keys without
inadvertently changing the on/off state of any keys
downstream.
The Boolean cont roller can be assig ned to any
parameter that would normally be controlled by a