Testing out cu.bes by omitting index.html and setup.js

script.js

var projector;
var objects = [], plane;

var mouse = new THREE.Vector2(),
offset = new THREE.Vector3(),
INTERSECTED, SELECTED;

initBoxes();

function initBoxes() {
  var geometry = new THREE.CubeGeometry( 40, 40, 40 );

  for ( var i = 0; i < 200; i ++ ) {
    var object = new THREE.Mesh( geometry, new THREE.MeshLambertMaterial( { color: Math.random() * 0xffffff } ) );

    object.material.ambient = object.material.color;

    object.position.x = Math.random() * 1000 - 500;
    object.position.y = Math.random() * 600 - 300;
    object.position.z = Math.random() * 800 - 400;

    object.rotation.x = Math.random() * 2 * Math.PI;
    object.rotation.y = Math.random() * 2 * Math.PI;
    object.rotation.z = Math.random() * 2 * Math.PI;

    object.scale.x = Math.random() * 2 + 1;
    object.scale.y = Math.random() * 2 + 1;
    object.scale.z = Math.random() * 2 + 1;

    object.castShadow = true;
    object.receiveShadow = true;

    scene.add( object );

    objects.push( object );
  }

  plane = new THREE.Mesh( new THREE.PlaneGeometry( 2000, 2000, 8, 8 ), new THREE.MeshBasicMaterial( { color: 0x000000, opacity: 0.25, transparent: true, wireframe: true } ) );
  plane.visible = false;
  scene.add( plane );

  projector = new THREE.Projector();

  renderer.domElement.addEventListener( 'mousemove', onDocumentMouseMove, false );
  renderer.domElement.addEventListener( 'mousedown', onDocumentMouseDown, false );
  renderer.domElement.addEventListener( 'mouseup', onDocumentMouseUp, false );
}

function onDocumentMouseMove( event ) {
  event.preventDefault();

  mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
  mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

  //

  var vector = new THREE.Vector3( mouse.x, mouse.y, 0.5 );
  projector.unprojectVector( vector, camera );

  var raycaster = new THREE.Raycaster( camera.position, vector.subSelf( camera.position ).normalize() );

  if ( SELECTED ) {
    var intersects = raycaster.intersectObject( plane );
    SELECTED.position.copy( intersects[ 0 ].point.subSelf( offset ) );
    return;
  }

  var intersects = raycaster.intersectObjects( objects );

  if ( intersects.length > 0 ) {
    if ( INTERSECTED != intersects[ 0 ].object ) {
      if ( INTERSECTED ) INTERSECTED.material.color.setHex( INTERSECTED.currentHex );

      INTERSECTED = intersects[ 0 ].object;
      INTERSECTED.currentHex = INTERSECTED.material.color.getHex();

      plane.position.copy( INTERSECTED.position );
      plane.lookAt( camera.position );
    }
    container.style.cursor = 'pointer';
  } else {
    if ( INTERSECTED ) INTERSECTED.material.color.setHex( INTERSECTED.currentHex );
    INTERSECTED = null;
    container.style.cursor = 'auto';
  }
}

function onDocumentMouseDown( event ) {
  event.preventDefault();

  var vector = new THREE.Vector3( mouse.x, mouse.y, 0.5 );
  projector.unprojectVector( vector, camera );

  var raycaster = new THREE.Raycaster( camera.position, vector.subSelf( camera.position ).normalize() );

  var intersects = raycaster.intersectObjects( objects );

  if ( intersects.length > 0 ) {
    controls.enabled = false;

    SELECTED = intersects[ 0 ].object;

    var intersects = raycaster.intersectObject( plane );
    offset.copy( intersects[ 0 ].point ).subSelf( plane.position );

    container.style.cursor = 'move';
  }
}

function onDocumentMouseUp( event ) {
  event.preventDefault();
  controls.enabled = true;

  if ( INTERSECTED ) {
    plane.position.copy( INTERSECTED.position );
    SELECTED = null;
  }
  
  container.style.cursor = 'auto';
}