two-link with Object3D

two link arm with object 3D grouping

by YouTingKuo

HTML

<div id="info">two-link arm
    <br/>
    <a>按住 left/right 移動 arm</a>
    <br/>
    <a>按住 up/dowm 移動 arm2</a>
</div>
<script src="//cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>
<script src="https://dl.dropboxusercontent.com/u/3587259/Code/Threejs/OrbitControls.js">
</script>
<script src="http://jyunming-chen.github.io/tutsplus/js/KeyboardState.js"></script>

CSS

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

JavaScript

var camera, scene, renderer, light, material, controls;
var arm, arm2;
var angle = 0, angle2 = 0;
var endEffector;
var keyboard = new KeyboardState();
var l = 0, r = 0, u = 0, d = 0;

init();
animate();

function init() {

  scene = new THREE.Scene();

  camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 10000);
  camera.position.set(0, 250, 300);
  scene.add(camera);

	THREE.ImageUtils.crossOrigin = '';
    var texture = THREE.ImageUtils.loadTexture('http://i.imgur.com/vKnIvYO.jpg');
  
  arm = new THREE.Object3D();
  scene.add(arm);

  endEffector = new THREE.Mesh(new THREE.SphereGeometry(5, 10, 10),
    new THREE.MeshLambertMaterial({
      color: 0xff1234
    }));
  scene.add(endEffector);

  var mesh = new THREE.Mesh(new THREE.BoxGeometry(20, 5, 5),
    new THREE.MeshBasicMaterial({
        map: texture,
        transparent: true
    }));
  mesh.position.set(10, 2.5, 0);
  arm.add(mesh);

  arm2 = arm.clone();
  arm2.position.set(20, 0, 0);
  arm.add(arm2);

  console.log(arm2);

  light = new THREE.PointLight(0xffffff);
  light.position.set(100, 300, 200);
  scene.add(light);

  var gridXZ = new THREE.GridHelper(100, 10);
  gridXZ.setColors(new THREE.Color(0xff0000), new THREE.Color(0xffffff));
  scene.add(gridXZ);

  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);
  
  window.addEventListener('keydown', onKeyDown, false);
	window.addEventListener ('keyup', onKeyUp, false);
  
}

function onKeyDown(event) {
		event.preventDefault();
    keyboard.update();
    if (keyboard.down("left")) {
  		l = 1;
  } else if (keyboard.down("right")) {
  		r = 1;
  } else if (keyboard.down("up")) {
  		u = 1;
  } else if (keyboard.down("down")) {
  		d = 1;
  }
}

function onKeyUp(event) {
		l = 0;
		r = 0;
    u = 0;
    d = 0;
}

function...