8

390 Chapter 12: Animation
Inter face
Once you assign a Lo okAt constraint, you can
access its properties on the LookAt Constraint
rollout on the Motion panel. On this rollout, you
can add or delete targets, assign weig hting , assign
and animate target weight values, and adjust other
related par ameters.
Note: WhenyouassignaLookAtconstraintviathe
Animation menu, 3ds Max assig ns a Rotation List
controller to your object. In the list on the Rotation
List rollout, you wil l find LookAt C onstraint,
which is the constraint yo u assigned. To view
theLookAtConstraintrollout,double-clickthe
LookAt Constraint entry in the list.
Add Look At Target—Use to add new targets that
influence t he constrained object.
Delete LookAt Ta rget —Use to remove target objects
that influence the constrained object.
Weight—Use to assign and animate weight values
for each target. Available only when multiple
targets are used.
K eep Initial Offset—Maintains the constrained
object’s original orientation as an offset to its
constrained orientation.
V i ewline Length—Defines the length of the main
viewline drawn from the pivot of the constrained
object to the pivot of its target (or the average, in
case of multiple t argets). A negative va lue draws
thelinefromtheconstrainedobjectintheopposite
direction of the target or targets.
With a single target, the length of t he viewline
is determined by the distance between the
constrained object and the target, as well as the
Viewline Length setting. However, if Viewline
Length Absolute is on, the distance between the
two has no effect on the length.
The color of the viewline is defined by the Target
Line element in the Gizmos category of the
Colors
panel (page 3–843)
in the Customize > Customize
User Interface dialog (page 3–836)
.
Note: When multiple targets are assigned,
additional viewlines drawn from the constrained
object to each target object inher it the color of the
respective targets. If Viewline Leng th Absolute