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K
kerfirkerfir
Participating Frequently
March 2, 2020
Question

How do I start/stop (toggle hold key frame) expression?

  • March 2, 2020
  • 2 replies
  • 3222 views

Hi, I am trying to get the wiggle expression (position) to start and stop at a specific time. I tried using slider, but setting toogle keyframe does work. I don't want a gradual interpolation but a definite start and stop. 

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2 replies

R
Community Expert
Rick GerardCommunity Expert
Community Expert
March 3, 2020

To make wiggle start at one second and end at 3 seconds add an expression with if statements like this:

if (time > 1 && time < 3) 
	wiggle(10, 20)
else 
	value

time is always counted in seconds unless you divide it by the comp frame rate, but that should get you started.

    K
    kerfirkerfirAuthor
    Participating Frequently
    March 3, 2020

    thanks for the expression it worked well. i modified it for it to deal with frame rate, which would work better with my workflow. Is something like this acceptable?? :

    fStart = 100; 
fStop = 400; 

tStart = framesToTime(fStart);
tStop = framesToTime (fStop);

  if ((time > tStart) && (time < tStop)){ 
      wiggle(1,10); 
  }else{ 
      value; 
  }

     

     

    OussK
    Community Expert
    OussKCommunity Expert
    Community Expert
    March 3, 2020

    can you share the expression you use?

      K
      kerfirkerfirAuthor
      Participating Frequently
      March 3, 2020

      hi, i used this expressioN: wiggle(effect("Slider Control")("Slider"),effect("Slider Control 2")("Slider")) 

      with the first slider for frequency and the second for amplitude

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