Orienting Object3D - JSFiddle

every possibilities

by j91157j91157

HTML

<div id="info">Orienting Object3D
<br/>Press ENTER to Change View
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/84/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js">


</script>
<script src="https://jyunming-chen.github.io/tutsplus/js/KeyboardState.js"></script>

CSS

#info {
  position: absolute;
  top: 0px;
  width: 100%;
  padding: 10px;
  text-align: center;
  color: #ffff00
}

body {
  // margin: 0;
  overflow: hidden;
}

JavaScript

var camera, scene, renderer, controls;
var lampGroup, light, mesh2, mesh, angle = 0;
var camera3rd;
var keyboard = new KeyboardState();

// mesh moves on its own
// mesh2 follows mesh by Object3D.lookAt
// light follows mesh by SpotLight.target
// lamp: rotate & fit inside an Object3D and use lookAt

init();
animate();

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

  camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1000);
  camera.position.z = 500;
  scene.add(camera);

  camera3rd = new THREE.PerspectiveCamera(80, window.innerWidth / window.innerHeight, 1, 1000);
  scene.add(camera3rd);

  renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.setClearColor(0x888888);

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

  document.body.appendChild(renderer.domElement);
  var gridXZ = new THREE.GridHelper(100, 10);
  gridXZ.setColors(new THREE.Color(0xff0000), new THREE.Color(0xffffff));
  //scene.add(gridXZ);

  ///////////////////////////////////////////////////////////
  // floor
  var floor = new THREE.Mesh(new THREE.PlaneGeometry(400, 400, 130, 130),
    new THREE.MeshLambertMaterial());
  floor.rotation.x = -Math.PI / 2;
  scene.add(floor);

  mesh = new THREE.Mesh(new THREE.BoxGeometry(20, 20, 20),
    new THREE.MeshLambertMaterial());
  scene.add(mesh);

  mesh2 = new THREE.Mesh(new THREE.BoxGeometry(50, 20, 5),
    new THREE.MeshNormalMaterial());
  scene.add(mesh2); // floor
  var floor = new THREE.Mesh(new THREE.PlaneGeometry(400, 400, 130, 130),
    new THREE.MeshLambertMaterial());
  floor.rotation.x = -Math.PI / 2;
  scene.add(floor);


  mesh2.position.set(130, 10, 70);
  // mesh2.lookAt (mesh.position);  // here wont work
  scene.add(mesh2);


  // lamp parameters
  var ly = 150,
    rt = 30,
    h = 40,
    alpha = Math.PI / 6;
  var rb = rt + h * Math.tan(alpha);

  var geometry = new THREE.CylinderGeometry(rt, rb, h, 20, 1, true);
  var...