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how to do this ? epressions maybe?
the effect i am trying to create is this: imagine in the real world a piece of thick paper with a hole in the top and string attached to it so the paper is hanging by the string. then you “wind up” the string by twisting the paper a bunch of times. you let it go, and it spins then slows down then spins the other way. now i could do this with keyframes obviously, but it needs to be applied to a bunch of layers and they need to be spinning for quite a while.
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2 Replies
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You can probably do it with a decaying cosine wave expression for y rotation. Something like this:
period = 4; //length of one cycle
revolutions = 3; // revolutions per cycle
decay = 0.2;revolutions*360*Math.cos(time*2*Math.PI/period)/Math.exp(decay*time)
Increase decay to have it slow down faster.
Dan
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Sweet expression, thanks.
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