solid

let n = 10,
  r = 20,
  p = 0.5;
function setup() {
  createCanvas(windowWidth, windowHeight, WEBGL);
  noStroke();
  normalMaterial();
}

function draw() {
  background(255);
  orbitControl();
  t = frameCount / 500;
  rotateX(t);
  rotateY(t);
  rotateZ(t);
  for (let i = -n; i < n; i++) {
    for (let j = -n; j < n; j++) {
      for (let k = -n; k < n; k++) {
        push();
        translate(
          r * i + random(-p, p),
          r * j + random(-p, p),
          r * k + random(-p, p)
        );
        sphere(r / 2, 12, 12);
        pop();
      }
    }
  }
}