Apple Motion 5.1.1 - Manual (Page 337)

Chapter 9 Behaviors 337
The Link behavior can be applied to a parameter animated with behaviors or keyframes;
however, the Link behavior does not affect the parameter when the Start Values or End Values
are zero.
When using the Link behavior to control an object’s position parameter, the linked coordinates
are based on the center point of the current group. So when an object is linked to another
object in the same group, it will share an identical position. However, if the source object is in a
different group, the coordinates might appear offset in space.
If your goal is to match an identical position across groups with different center points, you can
create an invisible dummy object in the group containing the source, link it to the source object,
then use the Match Move behavior to copy the dummy object’s position to that of the intended
target. Match Move compensates for inter-group position offsets and provides the option to
attach one object to another or to mimic the source object’s transformations. For more about
Match Move, see
Tracking behaviors overview on page 957.
You can also link to the group’s coordinates instead of the object’s, and use the Offset parameters
in the Link behavior to obtain the position you want. However, if that group is subsequently
added to another group, the linked object might not move as expected.
Note: When a link behavior is added, it is not enabled by default. To activate the behavior, click
the activation checkbox beside the behavior name in the Behaviors Inspector.
Parameters in the Inspector
•
Source Object: An object well that defines the source object in which the source parameter
resides. Click the To pop-up menu to select from the objects in the current project.
•
Source Parameter: A pop-up menu showing the parameter that serves as the source for the
Link behavior. Use this menu to select a new source parameter. Only parameters with the
same value type and number of attributes as the parameter selected in the Apply To (Target
Parameters) pop-up menu appear here.
Note: When possible, Source Parameter defaults to the parameter chosen in the Apply To row
(described below).
Important: Changing the Apply To (Target Parameters) setting changes which parameters
appear in the Source Parameter pop-up menu. If you cannot find the parameter you are
looking for, you might need to choose a Target Parameter to which you can link.
•
Apply To: A pop-up menu showing the parameter affected. Use this menu to reassign the
behavior to another parameter.
•
Apply Mode: A pop-up menu that sets how the values from the source parameter affect the
target parameter. The choices include:
•
Add to source: Adds the source parameter value to the existing value of the target parameter.
•
Multiply by source: Multiplies the source parameter value with the existing value of the
target parameter.
•
Replace with source: Replaces the existing value of the target parameter with that of the
source parameter.
•
Mix Over Time: A pop-up menu that sets how rapidly the source parameter values begin
to affect the target parameter. Options include: Ease In, Ease Out, Ease In/Out, Accelerate,
Decelerate, Accelerate/Decelerate, and Custom Mix.
•
Mix Time Range: A slider, available when the Mix Over Time pop-up menu is set to an
Ease or Acceleration option, that controls the number of frames over which the ease or
acceleration occurs.
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