Apple Motion 5.1.1 - Manual (Page 306)

Chapter 9 Behaviors 306
Behavior order of operations
There is no limit to the number of behaviors you can add to an object. When multiple behaviors
are applied to a single object, they work together to create a final animated effect.
In general, each behavior applies a value to a specific parameter. The values generated by all
behaviors that affect the same parameters are combined to create the end result. For example,
if you apply the Throw, Spin, and Gravity behaviors to a single object, the Throw and Gravity
behaviors combine to affect the position of the object. The Spin behavior affects the rotation of
the object.
When combining different behavior types (such as Parameter and Simulation behaviors), or
combining behaviors and keyframes, it is important to understand the behaviors’ order of
operations. Motion evaluates behaviors and keyframes in the following order:
Keyframes > Simulation behaviors > all other behaviors
Parameter behaviors are applied in the order in which they are added, from the bottom of the
Layers list up (like the order of filters and the compositing order). For more information, see
Copy,
paste, move, and reorder behaviors on page 304.
Important: The order of operations is always in effect—regardless of the order in which the
behaviors are applied or the keyframes added to a layer or group.
Use the following guidelines for animating layers with multiple behaviors or keyframes:
•
When you animate a layer with keyframes and then apply a behavior, the effect of the
keyframes is evaluated first.
For example, if you animate the Rotation parameter of a layer using keyframes and then apply
a Rotational Drag (Simulation) behavior to the layer, Motion evaluates the keyframed rotation,
and then applies the drag (from the Simulation behavior) to the keyframed animation.
•
When you animate a layer with any behavior and then add keyframes, the effect of the
keyframes is evaluated first.
For example, if you animate a layer so it rotates in a clockwise direction using the Spin
behavior and then keyframe the Rotation parameter so the layer rotates in a counterclockwise
direction, the layer rotates in the counterclockwise direction. Motion always evaluates
keyframes first.
•
When you animate a layer with a behavior and then apply a Simulation behavior, the
Simulation behavior is evaluated before the first behavior (and therefore may have no effect).
For example, if you animate the Rotation parameter of a layer using the Oscillate (Parameter)
behavior and then apply a Rotational Drag (Simulation) behavior to the layer, the layer
oscillates, but is not slowed by the Rotational Drag behavior. Motion evaluates the Simulation
behavior (Rotational Drag) before the Parameter behavior (Oscillate), applying the drag to a 0
value. There is no data for the Simulation behavior to affect.
Note: Although the Spin behavior appears in the Basic Motion category, Spin is treated as a
Simulation behavior in the order of operations.
For information on combining keyframes with behaviors, see Behaviors and keyframes in the
Keyframe Editor on page 311.
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