Link position to scale expression ?

[Andrei Popa]

https://www.youtube.com/watch?v=no9gtkH3sGY

Andrei
My Envato portfolio.

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[Lucas Piazzini]

Thank you very much !

[Scott Mcgee]

This is kind of what you want. I don’t have anything that caps it at a percentage, but hopefully it’ll get you started.

posTwo = thisComp.layer("Shape Layer 2").transform.position.key(1).value[1];
currentPos = thisComp.layer("Shape Layer 2").transform.position[1];

x = transform.scale[0] - (100 - (currentPos/posTwo)*100);
y = transform.scale[1];
[x,y]

[Scott Mcgee]

Just seen Andrei has answered you, hahaha. So ignore me.

[Lucas Piazzini]

After hours of headaches and with the help of my Data scientist father, I was able to make a much simpler and versatile version that revolves around no other constant than a factor unlike school of motion, it also allows you to control the speed of evolution from minimum scale to maximum scale, aswell as the minimum scale ! Thanks for your help I wouldn’t have improved without your link !

Factor = 20 //Control the scale variation, smaller factor = smaller minimum size

var diameter = thisComp.layer("Ball").content("Ellipse 1").content("Ellipse Path 1").size[1];
var ball_yPos = thisComp.layer("Ball Pos").transform.position[1];
var ground = thisComp.layer("Ground").transform.position[1];
var hDepart = diameter*2; //Control the scale speed
var diff_BallGround = ground - ball_yPos;

if (diff_BallGround<hDepart){ //Shadow Scaling
substract = (diff_BallGround/Factor)
}else{
substract=hDepart/Factor // Minimum size
}

if (substract&lt;0){ //To prevent the shadow from getting larger
substract = 0
}

[100-substract,transform.scale[1]]