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Combination of keyframes and expressions
hi everyone.
I’d like to rotate several solids around Y axis.
I want to do a serie of ratation, with a pause between each series. For this of course, I use keyframes.
But eveytime the solids stop their rotation, I want them to have a sinusoidal decay around Y axis (like a vibration)… so then I need to use an expression, but only at specific keyframes…
Is it possible, and how ?EDIT : here the result i want : https://fr.youtube.com/watch?v=nxmMfL9gcx8
(i use only keyframes for this example)thanks in advance.
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3 Replies
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I think this thread can help you out.
https://aenhancers.com/viewtopic.php?p=1733#1733
If you employee this method I think you’ll only need to apply the expression to one layer parented to a null creating the Y rotation. Then parent all your other layers to the layer with the expression, they should follow the vibration.
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Thank you for answering, I will try this later
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Hi everyone,
I’ve found this great expression which is solving my problem :n = 0;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time){
n–;
}
}
if (n == 0){
t = 0;
}else{
t = time – key(n).time;
}if (n > 0){
v = velocityAtTime(key(n).time – thisComp.frameDuration/10);
amp = 0.05;
freq = 3.0;
decay = 6;
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
value;
}I copy this in the rotation parameter, and on each keyframes that end a movement, it adds a little bounce effect.
found on gray machine.
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