Metaballs.js

var renderer = new PIXI.WebGLRenderer(1600, 1200, {
    antialias: false,
    transparent: true,
    resolution: 2,
    powerPreference: "high-performance"
});
renderer.autoResize = true;
document.body.appendChild(renderer.view);

var stage = new PIXI.Container();

var blurFilter = new PIXI.filters.BlurFilter();
blurFilter.blur = 10;
blurFilter.autoFit = true;

var particleCon = new PIXI.particles.ParticleContainer(500, {
    scale: true,
    position: true,
    rotation: false,
    uvs: false,
    alpha: false
});
stage.addChild(particleCon);

var i, b;
for (i=0; i<500; i++) {
    b = new PIXI.Sprite(loader.resources["img/drop-alpha.png"].texture);
    b.anchor.set(0.5);
    particleCon.addChild(b);
}

var thresholdFilter = new ThresholdFilter();
thresholdFilter.threshold = 0.5;

stage.filters = [blurFilter, thresholdFilter];
stage.filterArea = renderer.screen;