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Expression for scaling based on null position
I have a 2D comp with several icons that I want to scale with an expression based on the position of a null. I’m trying to create the effect of the icon growing as a mouse pointer passes by. I started with an expression that Dan Ebberts posted a while back, but I keep getting errors when I try to get it to work relative to the null position rather than the comp center. The problem I’ve had is that I can’t get it to factor in the Y position too.
I’m also stuck on getting it to look at the true null position if I parent it to another null, but that’s not totally essential.
Thanks!
pct = .25; // increase by 25%
r = 100; // distance to being increasing scale
center = thisComp.width/2;
p = toWorld(anchorPoint);
d = length(p,[center,p[1]]);
mult = ease(d,0,r,pct,0);
value*(1+mult)
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3 Replies
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Try it this way:
L = thisComp.layer(“Null 1”);
pct = .25;
r = 100;
p1 = toComp(anchorPoint);
p2 = L.toComp(L.anchorPoint);
d = length(p1,p2);
mult = ease(d,0,r,pct,0);
value*(1+mult)Dan
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Thanks so much! That worked perfectly.
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can you use this on a shape layer? Transforming the position of an elipse and having the size of a secondary ellipse scale?
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