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Control Expression Start
I’m using this great “Bouncy Scale In” expression from mographwiki.net but can’t control when it starts. Currently, it starts at the beginning of the comp regardless of where the layer starts.
I’ve tried to modify it using a couple methods I’ve found on the forums, but I either break it or it doesn’t do anything. Any help would be appreciated. Thanks!
k=16; // final scale
a=5; // how quickly the bounce ends
b=20; // how many bounces it'll do (that is, the bounce speed)
x=k*(1-Math.exp(-a*time)*Math.cos(b*time));
[x,x] -
5 Replies
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This is how you’d change it to start at the layer’s in point:
k=16; // final scale
a=5; // how quickly the bounce ends
b=20; // how many bounces it’ll do (that is, the bounce speed)
t = time-inPoint;
x=k*(1-Math.exp(-a*t)*Math.cos(b*t));
[x,x]Dan
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Thanks for the quick reply, Dan. Works great!
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What if you want it to reverse at a layer out point?
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This should do it:
k=16; // final scale
a=5; // how quickly the bounce ends
b=20; // how many bounces it’ll do (that is, the bounce speed)
t = (time < (inPoint+outPoint)/2) ? time – inPoint : outPoint – time;
x=k*(1-Math.exp(-a*t)*Math.cos(b*t));
[x,x]Dan
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Thanks Dan,
It actually looked real weird reverse bouncing. So all I wanted it to do was scale down so I had to duplicate the layer and fade between adjusting the out layers bounces to 1.You’re a legend.
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