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Add new keyframe using expression?
I’m looking to add a new keyframe with a specific value at a specific frame, using the values from a slider control to define that value and frame number. Or, if I could change the value and time of an existing keyframe using the slider controls, that would work just as well. Is this possible?
Here’s my situation: I have a layer that is continuously moving because of a time*x expression on the position parameter. I need this layer to loop, or repeat itself, after it reaches a certain frame or value. The catch is that the frame or value will change based on the values of the slider controls. I’ve tried multiple things, but I can’t figure this out. I figured if I can create a keyframe based on the slider control values, then I can add a loopOut(type=”cycle”) expression to loop it. If there is another way of doing this, please share.
Thank you in advance.
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4 Replies
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You can’t add keyframes with expressions. With scripts, yes.
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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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Thanks Todd, that’s what I was afraid of. Let me rephrase and if you can think of another way to do this then great. If not, thanks anyway.
I have a layer in motion powered by an expression, not keyframes. I need it to start its motion over and over again at intervals. So every X number of frames, it should repeat the motion. X value is based on a slider control input.
Here’s what I have so far:
cycleEnd is the time (in seconds) that the motion should start overmotion = (time * 30) * -thisComp.height; //Moves the layer one comp height every frame
if (time > cycleEnd)
{ yVal = ((time - cycleEnd) * 30) * -thisComp.height }
else { yVal = motion }
value + [value[0], yVal]
After Effects templates – lens flares, light leaks, old film effects, digital glitches, VHS glitches, and more: https://CreationEffects.com
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I’m not sure exactly what you’re trying to do, but I think you just need the modulus operator (%) to create your cycles. Something like this:
t = time%cycleEnd;
y = t*30*thisComp.height;
value – [0,y]Dan
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This is perfect! So elegant and simple. I have much to learn…
Thank you, Dan!After Effects templates – lens flares, light leaks, old film effects, digital glitches, VHS glitches, and more: https://CreationEffects.com
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