Referencing the expression of another layer

[benfrankdesign]

i have a somewhat lengthy expression that will be applied to all transform properties of all layers in a project. i would like to be able to easily update this expression and have that update ripple through all elements using it. my question is: is there a way to dynamically copy the expression of another layer? does the expression field itself have a name that i can use to copy it?

i want to do something like this:

thisComp.layer("layer_name").transform.position.expression;

where "expression" at the end is whatever the name of the expression field is. any help would be greatly appreciated.

[Dan Ebberts]

You can't access one expression from another, but you could construct your expression in a text layer and the evaluate that from your other expressions. So, you could put something like this a text layer:

x = 100;

y = 100;

[x,y]

And then put something like this in another layer's position expression:

eval(thisComp.layer("Text Layer 1").text.sourceText.value);

Dan