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Start wiggle at timepoint X without jumping
Hi there
I want to start a wiggle animation at a specific timepoint for a layer’s position.
I am currently using this code
maxFreq = 3;
freq = 0;if (time < 2.8) {
freq = 0; // 0 wiggles per second
} else {
if (freq < maxFreq) {
freq = freq + 0.05; // wiggles per second
}
}amp = 25; // px units applied for wiggle
loopTime = 10;
t = time % loopTime; // % returns remainder - resets every looptime to 0
wiggle1 = wiggle(freq, amp, 1, 0.5, t);
wiggle2 = wiggle(freq, amp, 1, 0.5, t - loopTime);
w = linear(t, 0, loopTime, wiggle1, wiggle2);
[w[0], w[1]]This code will start my wiggeling after 2.8s. But unfortunately I can see the position jumping in the beginning. I thought I could improve it by slowly increasing the freq variable, but obviously it would not work. Any idea how I could get this to work?
Thanks
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4 Replies
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Did you try ramping the amp variable from 0 to 25 instead?
Dan
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I did actually. That was the first thing I did after the post. I got kind of a working example, but as I was not sure about if my code actually works (no debugging or logging option, except from a text layer output, which I didn’t want to to ;)) I stopped playing around.
So you would say this works, by increasing the amp value?I also experienced problems with the following: I assume that the expression code is called everyframe. So how I can I increment a variable during my animation?
So
freq = freq + 0.05;Does not work at all.
I thought maybe by not declaring it at the beginning, but this would make my expression fail.Is my assumption correct?
My only other idea was to link the freq – or the amp – to time.
So I would set something like this:
amp = time * 0.05So after the first frame I would have time = 1 and amp = 0.05, right?
And after the second time = 2, amp = 0.1.
I hope I understand the time variable correctly…Any hints related to these things are welcome :).
Thanks in advance.Cheers
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You are correct that variables do not survive from frame to frame. You could do something like this to ramp amp from 0 to 25 over half a second:
tStart = 2.8;
amp = linear(time, tStart, tStart+.5, 0, 25);Dan
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Oh that’s a nice idea. I think I need to internalize some of those AE expression concepts a little bit.
Thanks mate, for the hint. I’ll try it out.
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