Apple Motion 4 - Manual (Page 446)

• Accelerate: The object moves along the path with increasing speed.
• Decelerate: The object moves along the path with decreasing speed.
• Natural: The speed in which the object moves over the path is determined by the
shape of the path. For example, if the path is a U-shape curve, the object moves faster
as it moves toward the low point of the U and slower as it moves up the edges.
• Custom: Custom allows you to define the movement of the object along its path by
setting keyframes for the object’s speed from 0 to 100 percent. In other words, you
determine the position of the object along the path in time.
Custom Speed: This parameter becomes available when Speed is set to Custom. You
can modify the Custom Speed velocity curve in the Keyframe Editor. You can keyframe
custom values to make an object, for example, travel forward to a specific percentage of
the path, then backward, then forward, and so on before it reaches the end of the
animation.
Apply Speed: When the Loops parameter is set to a value greater than 1, this pop-up
menu determines how the Speed parameter (velocity) is applied over the duration of the
behavior.
Note: Loops must be set to a value greater than 1 for the Apply Speed parameter to have
any effect.
• Once Per Loop: The velocity, as defined by the Speed parameter, is applied to each
cycle. For example, if Loops is set to 3 and Speed is set to Accelerate, the object
accelerates each time it travels over the path. The speed is applied to the entire duration,
ignoring the Loops setting.
• Over Entire Duration: The velocity, as defined by the Speed parameter, is applied one
time over the duration of the behavior. For example, if Loops is set to 3 and Speed is
set to Accelerate, the object accelerates the first time it travels over the path, but not
the second and third time.
Loops: Determines the number of times the object travels the motion path over the
duration of the behavior. For an object to travel its path more than once, or to “ping
pong,” Loops must be set to a value greater than 1.
End Condition: A pop-up menu that defines the behavior of the object once it reaches
the end of its motion path. There are two options:
• Repeat: The object travels the motion path the number of times defined by the Loop
parameter.
• Ping-Pong: The object moves along the path until it reaches the last point on the path,
then it moves backward to the first point on the path. The number of “ping pongs” is
defined by the Loops parameter.
446 Chapter 9 Using Behaviors