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Forums Adobe After Effects Expressions Problem Scale expression… what i’m wrong?

  • Problem Scale expression… what i’m wrong?

  • Dimitri Bertolini

    April 23, 2021 at 2:34 pm

    Hi all!

    This is my first time I post here, but I followed you for a very long time.

    I have a problem with a (simple?) expression.

    I need to link a layer’s Scale to a Null Scale. I need that, if the scale of null is bigger than 100, mi main layer is that value -15, while if the value of null is 100 or less, my layer is the value of null.

    I have used an else if function (ok, I could use a simple if-else, but the problem still remains), but it always returns me a problem on a variable.

    what’s I wrong?

    This is the problem:

    sc = thisComp.layer("SCALA_SECONDA_PARTE").transform.scale; // Error: undefined value used in expression (could be an out of range array subscript?)
    vaX = transform.scale[0];
    vaY = transform.scale[1];
    scHigh = sc-15;
    if (sc == 100) {
    } else if (sc <100) {
    } else if (sc<100) {

    I tried to write it pointing only one dimension of the null’s scale (sc = thisComp.layer(“SCALA_SECONDA_PARTE”).transform.scale[0]; , and again, same error.

    I’m still learning the expressions, so thank all for your help! 🙂

  • Dan Ebberts

    April 23, 2021 at 6:16 pm

    This should work:

    sc = thisComp.layer("SCALA_SECONDA_PARTE").transform.scale;

    sc[0] > 100 ? sc - [15,15] : sc

  • Dimitri Bertolini

    May 5, 2021 at 10:21 am

    Thanks Dan!

    This worked perfectly! 🙏

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