// Computes the aspect ratio of the window.
let aspectRatio = window.innerWidth / window.innerHeight;

// Creates a camera and sets its parameters and position.
let camera = new THREE.PerspectiveCamera(70, aspectRatio, 0.01, 10);
camera.position.z = 1;

// Creates the scene that contains our objects.
let scene = new THREE.Scene();

// Creates a geometry (vertices and faces) corresponding to a cube.
let geometry = new THREE.BoxGeometry(0.2, 0.2, 0.2);

// Creates a material that paints the faces depending on their normal.
let material = new THREE.MeshNormalMaterial();

// Creates a mesh that associates the geometry with the material.
let mesh = new THREE.Mesh(geometry, material);

// Adds the mesh to the scene.
scene.add(mesh);

// Creates the renderer and append its canvas to the DOM.
renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// Renders the scene with the camera.
renderer.render(scene, camera);