let angle = 0;
let w = 24;

function setup() {
   createCanvas(400, 400, WEBGL);
}

function draw() {
   background(175);
   ortho();
   directionalLight(255, 255, 255, 0, -1, 0);

   translate(0, 50, -50);
   rotateX(PI / 8);

   rectMode(CENTER);

   let offset = 0;
   for (let x = 0; x < width; x += w) {
      push();
      let a = angle + offset;
      let h = map(sin(a), -1, 1, 0, 100);
      translate(x - width / 2, 0, 0);
      ambientMaterial(255);
      box(w, h, w);
      //rect(x - width / 2 + w / 2, 0, w - 2, h);
      offset += 0.1;
      pop();
   }

   angle += 0.1;
}