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help with expressions
HI i’m fairly ne to after effects and epressions. I have been making small motion graphics and i ran into a small snag when trying to add two movement expressions to one camera. the code i’m useing is as follows:
t = time – key(2).time;
if (t< 0){ value; }else{ veloc = 18; amplitude = 55; decay = 4; y = amplitude*Math.cos(veloc*t)/Math.exp(decay*t); value + [y,0]; } The problem I am havin is that I have two seperate times when I want this movement to affect different text, but whenever I try anything such as duplicating the code for example After effects does it for one and not the other. This might be a really stupid problem to have but I figure it's better to ask. thanks Duranreplied 20 years, 3 months ago 2 Members · 2 Replies
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2 Replies
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Are you trying to trigger the bounce at two different keyframes? If so, what’s supposed to happen between the keyframes?
Dan
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Assuming you don’t want to trigger a vibration at every keyframe, I’d use something like this and just put a layer marker wherever you want the vibration to occur:
n = 0;
if (marker.numKeys > 0){
n = marker.nearestKey(time).index;
if (marker.key(n).time > time){
n–;
}
}if (n == 0){
value;
}else{
t = time – marker.key(n).time;
veloc = 18;
amplitude = 55;
decay = 4;
y = amplitude*Math.cos(veloc*t)/Math.exp(decay*t);
value + [y,0];
}Dan
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