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Dan’s Expression for Time Stretch
Hi Dan,
I got the following expression for a stretch effect from your site:
freq =3;
amplitude = 35;
decay = 1.0;s = amplitude*Math.sin(freq*time*2*Math.PI)/Math.exp(decay*time);
scale + [s,s]Is there a way to change this expression so that the animation starts from 0 scale value. In others words, I want the layer to ‘appear’ like a pop-up.
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2 Replies
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Try this, it may be close to what you’re looking for:
t = time - inPoint;
startVal = 0;
endVal = 100;
dur = 0.1;
if (t < dur){
s = linear(t,0,dur,startVal,endVal);
}else{
amp = (endVal - startVal)/dur;
freq = 3;
decay = 5;
w = freq*Math.PI*2;
s = endVal + amp*Math.sin((t-dur)*w)/Math.exp(decay*(t-dur))/w;
}
[s,s]
Adjust the amplitude of the overshoot by changing the dur variable (smaller value = more overshoot).
Dan
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It works like a treat!
If it is not too much to ask Dan, can you also help with the following:
I am looking to move a layer so it appears to drop from the middle of the screen to the bottom. However, I want to be able to control the start of the drop and the speed with controllers. The start is to be designated by a marker preferably.
So lets says a text layer is on the middle of the screen. At about 4 secs it drops by moving up a few pixels first and then all the way down to the bottom of the screen (or completely off screen)This is related to the above time stretch and hence why I am asking here.
Thanks 🙂
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