random in sphere with p5.js

randomInSphere.js

// Please run on p5.js Web Editor or OpenProcessing.
// https://editor.p5js.org/
// https://www.openprocessing.org/

function randomInSphere() {
  const cosTheta = -2.0 * Math.random() + 1.0;
  const sinTheta = Math.sqrt(1.0 - cosTheta * cosTheta);
  const phi = 2.0 * Math.PI * Math.random();
  const radius = Math.pow(Math.random(), 1.0 / 3.0);
  return [
    radius * sinTheta * Math.cos(phi),
    radius * sinTheta * Math.sin(phi),
    radius * cosTheta
  ];
}

function setup() {
  createCanvas(300, 300, WEBGL);
  noLoop();  
}

function draw() {
  camera(0, 0, 250, 0, 0, 0, 0, 1, 0);
  lights();
  const halfSize = [0.5 * width, 0.5 * height];
  background(240);
  fill(255);
  noStroke();
  for(let i = 0; i < 2000; i++) {
    const pos = randomInSphere();
    push();
    translate(100.0 * pos[0], 100.0 * pos[1], 100.0 * pos[2]);
    sphere(2.0);
    pop();
  }
}