Zoom to cursor

zoom.js

controls.noZoom = true;

window.addEventListener('mousewheel', function(e) {
  e.preventDefault();
  var x = ( event.clientX / window.innerWidth ) * 2 - 1,
      y = - ( event.clientY / window.innerHeight ) * 2 + 1,
      vector = new THREE.Vector3(x, y, 1),
      factor = 0.005,
      func = e.deltaY < 0 ? 'addVectors' : 'subVectors';
  vector.unproject(camera);
  vector.sub(camera.position);
  camera.position[func](camera.position,vector.setLength(factor));
  controls.target[func](controls.target,vector.setLength(factor));
  camera.updateProjectionMatrix();
})