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Flow field expression
Hi!
I have been looking for an expression or maybe even a plugin that can generate a flow field like this: https://www.youtube.com/watch?v=VYh9-kZ8mvY
I was thinking of a rotation based expression (target) linked to a turbulent noise filter or something?
Thanks!
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replied 4 weeks ago 2 Members · 1 Reply
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1 Reply
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This application is perfect for noise(), the expressions built-in Perlin noise field generator. I’d start with a rotation expression like this:
dDiv = 1000; // distance divider
tDiv = 2; // time divider
maxAngle = 180; // maximum angle (+ or -)
r = noise([position[0]/dDiv,position[1]/dDiv,time/tDiv])*maxAngle;
value + rFor reference, I used this position expression to position a grid of identical 100×100 layers with anchor point centered:
hSpace = 100; // distance between columns
vSpace = 100; // distance between rows
nCols = Math.round(thisComp.width/hSpace);
origin = [hSpace,vSpace]/2;
myCol = (index-1)%nCols;
myRow = Math.floor((index-1)/nCols);
origin + [myCol*hSpace,myRow*vSpace];
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