Triggering movement of an object by a sound in another comp

[Dan Ebberts]

This might help. This will scan the audio layer from its In Point, look for the first frame where the value reaches the threshold (100 in this case). If it finds one, it will ease the x position of the layer to the right, starting one second before the threshold is hit.


threshold = 100;
prerun = 1;
moveDur = 1; // duration of move
moveDist = 100; // x distance of move

L = comp("audio comp").layer("audio layer");
aud = L.effect("Sound Keys")("Output 1");
trigger = false;

t=L.inPoint;
while (t < L.outPoint){
if (aud.valueAtTime(t) >= threshold){
trigger = true;
break;
}
t += thisComp.frameDuration;
}
if (trigger)
x = ease (time,t-prerun,t-prerun+moveDur,0,moveDist)
else
x = 0;
value + [x,0]


Dan

[Patrick Dunn]

wow! That’s amazing – thanks so much. I’ve fiddled with it a bit, got it moving up and down and stuff. I kind of 80% understand it and I’ll fiddle to see if I can work out how to make it react/move for every instance of the 100 peak.

Thanks again – Patrick

[Dan Ebberts]

If you want to trigger an animation everytime the value reaches 100, you should look at this (if you haven’t already):

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

If you want the animation to be cumulative, you’ll need to incorporate some logic like my beat counter has to calucate how much movement has occurred due to previous triggers:

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

Lack of persistent data in expressions does make things complicated. 🙂

Dan