script.js

var scene, camera, renderer;
var geometry, material, mesh;

init();
animate();

function init() {
  scene = new THREE.Scene();

  camera = new THREE.PerspectiveCamera(
    75, window.innerWidth / window.innerHeight, 1, 10000);
  camera.position.z = 1000;

  geometry = new THREE.BoxGeometry(850, 250, 250);
  material = new THREE.MeshBasicMaterial({
    color: 0xff0000, wireframe: true });

  mesh = new THREE.Mesh(geometry, material);
  scene.add(mesh);

  renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);

  document.body.appendChild(renderer.domElement);
}

function animate() {
  requestAnimationFrame(animate);

  mesh.rotation.x += 0.14;
  mesh.rotation.y += 0.17;
  mesh.rotation.z += 0.25;

  renderer.render(scene, camera);
}