bounce in (by expression?)

[David Modijefsky]

Oops, I did a search without ‘archives’ checked on. Now I’ve found ‘squach & stretch’ from Dan which I was able to modify to my needs with my limited knowledge of expressions. That leaves me with 1 question though. The expression only works when the layer starts at frame 0. How do I alter the code so that I can move the layer in point where ever I like? The problems are in lines 4 and 5 I guess. This is what I have so far:

max_dev=20; // max deviation in pixels
spd=35; //speed of oscillation
decay=10; //how fast it slows down
x=scale[0]+max_dev*Math.sin(spd*(time-in_point))/Math.exp(decay*time);
y=scale[0]+max_dev*Math.sin(spd*(time-in_point))/Math.exp(decay*time);
[x,y]

[Dan Ebberts]

This should do it:

max_dev=20; // max deviation in pixels
spd=35; //speed of oscillation
decay=10; //how fast it slows down
t = time – in_point;
s = max_dev*Math.sin(spd*(t))/Math.exp(decay*t);
value + [s,s]

Dan

[Mike Clasby]

You might find this useful, and the I have a question for Dan. Here’s the same thing triggered by a marker set on the layer (From one of Dan’s earlier posts):

n = 0;
if (marker.numKeys > 0){
n = marker.nearestKey(time).index;
if (marker.key(n).time > time){
n–;
}
}

if (n == 0){
value;
}else{
max_dev=20; // max deviation in pixels
spd=35; //speed of oscillation
decay=10; //how fast it slows down
t = time – marker.key(n).time;
s = max_dev*Math.sin(spd*(t))/Math.exp(decay*t);
value + [s,s];
}

Question for Dan, I hacked the above from a “Marker Triggers Move” expression of yours, my question is, can I make the Trigger specific to a markers name, like one marker triggers a Move and a different marker (same layer)triggers a Squish and Squash?

[Dan Ebberts]

It depends on which version of AE you’re running. You can’t access the comment in the newer versions but you used to be able to with marker.value. Hopefully this very useful feature will be restored in a future version.

Dan

[Mike Clasby]

Thanks.

[David Modijefsky]

Thanx Dan! So if I have expression questions in the future it’s wise to specify which version of AE I’m running?

[Dan Ebberts]

Sure, that would be helpful. Especially if it’s not the latest version.

Dan

[Doug Bassett]

I know this is an old post, but how can I refer to time other than in point?