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scriptingexpressionextendscriptafter-effects

Write Live expressions in after effects cc using Extendscript?

I am trying to write a script for after effects CC using Extendscript. I wonder if it is possible to add live expressions to a layers properties like thisComp.layer("Layer 1").transform.position and so on.

Hoping it is possible.

Thanks in advance :)

Solution

  • This should work for you.

    var expString = "thisComp.layer(\"My-Layer\").transform.position";
var prop = app.project.item(index).layer(index).transform.position;
if(prop.canSetExpression === true){
    prop.expression  = expString;
}

    Replace the index with your layers index and item index. If you use strings in your expression like 

    thisComp.layer(\"My-Layer\").transform.position

    You need to escape them properly. Don't use single quotation marks in your expressions. e.g. 'My-Layer'. This creates new problems.

    Take a look into the After-Effects-CS6-Scripting-Guide.pdf