(1 + CLOUDS_ALT), 75, 75),
        new THREE.MeshPhongMaterial({ map: cloudsTexture, transparent: true })
      );
      world.scene().add(clouds);

      (function rotateClouds() {
        clouds.rotation.y += CLOUDS_ROTATION_SPEED * Math.PI / 180;
        requestAnimationFrame(rotateClouds);
      })();
    });
  </script>
</body>