nside of the box instead of the outside. Like the floor
we'll set it only to receive shadows. Also we'll set the position of the
box so its bottom is slightly below the floor so the floor and the bottom
of the box don't z-fight.</p>
<pre class="prettyprint showlinemods notranslate lang-js" translate="no">{
  const cubeSize = 30;
  const cubeGeo = new THREE.BoxGeometry(cubeSize, cubeSize, cubeSize);
  const cubeMat = new THREE.MeshPhongMaterial({
    color: '#CCC',
    side: THREE.BackSide,
  });
  const mes