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3 Select a source channel from which to link and click Copy.
For example, copy the x position of axis1 and link it to the x blur value of a layer.
4 Select the destination channel and click Link.
The x blur value of layer1 is linked to the x position value of axis41, so as the position increases, so
does the blur. This is shown in the following illustration.
Copying Nodes with Expressions
When working in Action, Keyer or Garbage Masks, if you copy a branch in Schematic view, or append to a
setup by loading a second setup, any nodes with the same name as existing ones are renamed with unique
names. Likewise, if expressions are associated with those nodes, the expressions are replicated and the
associated channels are renamed to correspond with the new node names. This preserves the integrity of
the expression within the copied branch or appended setup.
If you copy a portion of a branch that has expressions associated with it, the expressions related to the copied
portion of the branch will be associated with the new copy. Expressions related to uncopied portions of the
branch will maintain their association with the original branch.
Cascading Expressions
You can copy a single expression to multiple channels that build on the result in the previous channel using
the SelectionOrder and CascadeChannel keywords. These keywords increment the channel number or name
as follows:
■ Each instance of SelectionOrder increments the channel number.
■ Each instance of CascadeChannel replaces the occurrence of the channel name with the name of the
preceding channel, relative to the order in which the channels are selected.
In general, experiment with the SelectionOrder and CascadeChannel keywords to determine which results
are optimal for your animation.
To apply cascading expressions using SelectionOrder:
1 Click Animation to display the Animation controls.
2 From the Channel View box, select Info.
3 Select multiple channels to which you want to apply the cascaded expression, in the desired order.
As you select each channel, the selection order is shown next to the channel name in Info view.
Advanced Animation: About Expressions | 1243