Two-sided Texture

MultiMaterialObject

by jmchen

HTML

<div id="info">Two-Sided Texture
  <br>Using MultiMaterialObject
</div>
<script src="http://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>

CSS

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

body {
  overflow: hidden;
}

JavaScript

//
// because both sides use the same faceVertexUvs
// the backface texture requires a horizontal flip
// to make it right
//
// the more elegant way is to use
// glFrontFace in GLSL
// as in this fiddle: http://jsfiddle.net/jmchen/k7xmyccv/
//
var camera, scene, renderer, controls;

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);
  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);
  //////////////////////////////////////////////////////////
  THREE.ImageUtils.crossOrigin = '';
  var texture1 = THREE.ImageUtils.loadTexture('http://i.imgur.com/UDas19Q.png');
  var texture2 = THREE.ImageUtils.loadTexture('http://i.imgur.com/fe5C2iP.png');
  var plane;
  var geom = new THREE.PlaneGeometry(200, 100, 4, 4);
  var material1 = new THREE.MeshBasicMaterial({
    map: texture1,
    side: THREE.FrontSide
  });
  var material2 = new THREE.MeshBasicMaterial({
    map: texture2,
    side: THREE.BackSide,

  });
  // create a multimaterial
  var plane = THREE.SceneUtils.createMultiMaterialObject(geom, [material1, material2]);
  scene.add(plane);
}

function animate() {
  controls.update();
  requestAnimationFrame(animate);
  render();
}

function render() {
  renderer.render(scene, camera);
}