text: /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   */
  
  THREE.HemisphereLightHelper = function ( light, sphereSize ) {
  
  	THREE.Object3D.call( this );
  
  	this.light = light;
  	this.light.updateMatrixWorld();
  
  	this.matrix = light.matrixWorld;
  	this.matrixAutoUpdate = false;
  
  	this.colors = [ new THREE.Color(), new THREE.Color() ];
  
  	var geometry = new THREE.SphereGeometry( sphereSize, 4, 2 );
  	geometry.rotateX( - Math.PI / 2 );
  
  	for ( var i = 0, il = 8; i < il; i ++ ) {
  
  		geometry.faces[ i ].color = this.colors[ i < 4 ? 0 : 1 ];
  
  	}
  
  	var material = new THREE.MeshBasicMaterial( { vertexColors: THREE.FaceColors, wireframe: true } );
  
  	this.lightSphere = new THREE.Mesh( geometry, material );
  	this.add( this.lightSphere );
  
  	this.update();
  
  };
  
  THREE.HemisphereLightHelper.prototype = Object.create( THREE.Object3D.prototype );
  THREE.HemisphereLightHelper.prototype.constructor = THREE.HemisphereLightHelper;
  
  THREE.HemisphereLightHelper.prototype.dispose = function () {
  
  	this.lightSphere.geometry.dispose();
  	this.lightSphere.material.dispose();
  
  };
  
  THREE.HemisphereLightHelper.prototype.update = function () {
  
  	var vector = new THREE.Vector3();
  
  	return function update() {
  
  		this.colors[ 0 ].copy( this.light.color ).multiplyScalar( this.light.intensity );
  		this.colors[ 1 ].copy( this.light.groundColor ).multiplyScalar( this.light.intensity );
  
  		this.lightSphere.lookAt( vector.setFromMatrixPosition( this.light.matrixWorld ).negate() );
  		this.lightSphere.geometry.colorsNeedUpdate = true;
  
  	};
  
  }();
  