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Activity Forums Adobe After Effects Expressions Refer to a value outside of the comp

  • Refer to a value outside of the comp

    Posted by Jerome Laville on April 29, 2020 at 1:23 pm

    Hi,

    I have 256 compositions, all very similar and with the same black solid as the top layer. On that solid I have a basic expression that toggles the opacity on and off randomly, off being 10 times more likely than on.

    If I wanted to change the likelihood from 10 to 20, I’d have to go and change the expression in all 256 compositions. Could I avoid that by setting that X number somewhere in my project outside of these compositions, and refer to it? I could then easily play with that number and affect all compositions.

    Many thanks.

    Jerome Laville replied 4 years, 2 months ago 2 Members · 2 Replies
  • 2 Replies
  • Dan Ebberts

    April 29, 2020 at 2:10 pm

    Sure. It might look something like this:

    pct = comp(“Controls”).layer(“Controls”).effect(“Percent”)(“Slider”);
    seedRandom(index,true);
    random() < pct/100? 100 : 0

    Dan

  • Jerome Laville

    April 29, 2020 at 2:14 pm

    That would be it. Thank you so much for this and for everything you do Dan.

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