Apple Motion 3 - Manual (Page 424)

424 Chapter 5 Using Behaviors
HUD Control
The HUD has an object well, a Transition slider, a Speed pop-up menu that allows you
to define the object’s velocity, an Axis pop-up menu to choose which axis should point
at the target once the movement is complete, and an Invert Axis checkbox.
Parameters in the Inspector
Object: A well that defines the target object. To set the target object, drag the object
from the Layers tab to the Object well in the Point At HUD or Inspector. You can also
drag the target object from the Layers tab onto the Point At behavior.
Transition: This slider determines how long it takes for the object to go from its
starting orientation to pointing at the center of the target object. This parameter is
useful when the object is pointing at a moving target object.
If Transition is set to 50% in a 300-frame project, and the target object is not moving,
the point-at object takes 150 frames to point at (or orient to) the center of the target
object and then stops moving for the duration of the behavior. If Transition is set to
100%, the point-at object takes the full 300 frames to point at the target object. If the
Point At behavior’s duration is 100 frames, and Transition is set to 50%, the point-at
object takes 50 frames to orient to the target object.
If Transition is set to 50% in a 300-frame project, and the target object is animated, the
point-at object takes 150 frames to point at (or orient to) the center of the target object
and then continues following the animated target object for the duration of the
behavior. If Transition is set to 100%, the point-at object takes the full 300 frames to
point at the target object.
Speed: A pop-up menu that defines the object’s velocity from its position in the
Canvas to the position of the target. There are six choices:
 Constant: The object moves at a steady speed from its position toward the target.
 Ease In: The object starts at a slow speed, then reaches and maintains a steady
speed toward the target.
 Ease Out: The object starts at a steady speed, then slows down as it gradually
decelerates to a stop when it reaches the target.
 Ease Both: The object slowly accelerates and then slows down as it gradually
decelerates to a stop when it reaches the target.
 Accelerate: The object moves toward the target with increasing speed.
 Decelerate: The object moves toward the target with decreasing speed.
Axis: A pop-up menu that lets you align the rotation of the object to the X, Y, or Z axis.
The default axis is Z. This parameter specifies which axis points at the target once the
movement is complete.