How to rotate the camera - gsap

Questions
4

This is the code from the fiddle:

var mesh, renderer, scene, camera, controls;

init();
animate();

function init() {

  // renderer
  renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.setPixelRatio(window.devicePixelRatio);
  document.body.appendChild(renderer.domElement);

  // scene
  scene = new THREE.Scene();

  // camera
  camera = new THREE.PerspectiveCamera(40, window.innerWidth / window.innerHeight, 1, 10000);
  camera.position.set(20, 20, 20);

  // controls
  controls = new OrbitControls(camera, renderer.domElement);

  // ambient
  scene.add(new THREE.AmbientLight(0x222222));

  // light
  var light = new THREE.DirectionalLight(0xffffff, 1);
  light.position.set(20, 20, 0);
  scene.add(light);

  // axes
  scene.add(new THREE.AxesHelper(20));

  // geometry
  var geometry = new THREE.SphereGeometry(5, 12, 8);

  // material
  var material = new THREE.MeshPhongMaterial({
    color: 0x00ffff,
    flatShading: true,
    transparent: true,
    opacity: 0.7,
  });

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

  gsap.to(camera.rotation, {
    duration: 1,
    y: Math.PI * 0.25
  });

}

function animate() {

  requestAnimationFrame(animate);
  renderer.render(scene, camera);

}