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Activity Forums Adobe After Effects Expressions How to “easeIn” to keyframe over time.

  • How to “easeIn” to keyframe over time.

    Posted by Michael Stark on January 13, 2014 at 7:51 pm

    I tried working this out for myself but I’m at wits end.

    All I’m trying to do is take a keyframe and set a specific “easeIn” time no matter where that keyframe is on the timeline.

    For example:

    I have a comp that is 500 frames long and have a Ease In set for a keyframe that is at frame 500. I want that Ease In to start at frame 400 (100 frames long). Now if I move that keyframe anywhere on the time line (let’s say frame 325) then it will always start 100 frames prior. So since I moved the keyframe in this example to frame 325, the Ease In will automatically start at frame 225.

    This sounded super simple until I started trying to work it out and I got stuck. Any help is much appreciated :D!

    Jeff Bobbington replied 12 years, 3 months ago 3 Members · 3 Replies
  • 3 Replies
  • Jeff Bobbington

    January 16, 2014 at 11:55 am

    Can’t you just use 2 keyframes spaced out by 100frames instead of the 1?

    I’m looking from something simialar.
    I need to trigger a set linear movement over 3 seconds, but it needs to be triggered when a slider on another layer passes the number 5. Does anyone know if this is even possible?

  • Dan Ebberts

    January 17, 2014 at 1:58 am

    It is possible, but slightly tricky. Your expression needs to loop back in time from the current frame to find how long it has been since the frame where the slider went from less than 5 to greater than 5. There should be examples of such a “threshold detector” around here somewhere. Should be similar in concept to this:

    https://www.motionscript.com/design-guide/audio-trigger.html

    Dan

  • Jeff Bobbington

    January 17, 2014 at 10:55 am

    Thanks for pointing me in the right direction Dan.

    I think i figured everything out but boy does it slow down AE.
    Probably because I have to apply it to over 50 layers.
    It’s a shame there’s no proper trigger function.

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