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  • Adobe After Effects Expressions

    Accessing atribute in timeremapped preComp to keyframe in masterComp

    Posted by Miha Zaletel on August 19, 2015 at 9:06 pm

    Hello!

    I want to switch on/off 3 layers that are in precomp. This precompe is timeremapped and driven by Audio amplitude. I want to keyframe opacity of those layers from main comp.

    I set up an simple expression that drive opacity on and off from controllLayer .rotation in main comp.

    If there is no keyframes on rotation, expression works, but when I put keyframes on it freezes on 1st keyframe.

    Main compa duration = 5000f
    precomp dur. = 9 f

    I guess issue is, that I need on the same timecode in precomp(ex. f4) at diferent timecodes in maincomp (ex. f15,f60,f105…) different layers to be on.

    example:
    mainComp = 15f, precomp = f4, layer 3 is active, others not
    mainComp = 60f, precomp = f4, layer 1 is activ, others not
    ….

    Is this achieveble? please.

    Regards,
    m.z.

    //first layer in precomp Opacity attribute

    uCtrl= comp("GLAVA_big").layer("ustaControll").transform.rotation;
    if (uCtrl ==1) 100;
    else
    0;

    // second layer in precomp
    uCtrl= comp("GLAVA_big").layer("ustaControll").transform.rotation;
    if (uCtrl ==0) 100;
    else
    0;

    //third layer in precomp
    uCtrl= comp("GLAVA_big").layer("ustaControll").transform.rotation;
    if (uCtrl ==-1) 100;
    else
    0;

    Kalleheikki Kannisto replied 10 years, 9 months ago 2 Members · 1 Reply
  • 1 Reply

  • Kalleheikki Kannisto

    August 21, 2015 at 8:25 am

    Could you upload a simplified version of your project?

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