How to create BLOB TRACKING Effect in After Effect (No Plugins)
Expressions copy here or download file below:
Position:
compW = thisComp.width;
compH = thisComp.height;
step = 2; // every 2 frames
zoneW = compW * 1.0; //
zoneH = compH * 1.0; //
zoneCenter = [compW / 2, compH / 2];
f = Math.floor(timeToFrames(time) / step);
seedRandom(f + index, true);
x = random(zoneCenter[0] - zoneW / 2, zoneCenter[0] + zoneW / 2);
y = random(zoneCenter[1] - zoneH / 2, zoneCenter[1] + zoneH / 2);
[x, y]
Scale:
step = 2; // every 2 frames
f = timeToFrames(time);
segment = Math.floor(f / step);
seedRandom(segment + index, true);
start = random(100, 500);
seedRandom(segment + 1 + index, true);
end = random(100, 500);
t = framesToTime(f % step);
d = framesToTime(step);
s = ease(t, 0, d, start, end);
[s, s]
Line:
start = thisComp.layer("04 SHAPE: Path 1 [1.1.0]").toComp([0, 0]);
end = thisComp.layer("05 SHAPE: Path 1 [1.1.3]").toComp([0, 0]);
createPath([start, end], [], [], false);
Expressions file:
https://www.dropbox.com/scl/fo/2ecx63...
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In this tutorial we'll create very popular Blob Tracking Effect without any plugins in After Effects.
Feel free to use timecodes:
0:00 Intro
0:16 Let's start
08:13 Final Thoughts