text: /**
   * @author alteredq / http://alteredqualia.com/
   * @author mrdoob / http://mrdoob.com/
   * @author WestLangley / http://github.com/WestLangley
  */
  
  THREE.SpotLightHelper = function ( light ) {
  
  	THREE.Object3D.call( this );
  
  	this.light = light;
  	this.light.updateMatrixWorld();
  
  	this.matrixWorld = light.matrixWorld;
  	this.matrixAutoUpdate = false;
  
  	var geometry = new THREE.CylinderGeometry( 0, 1, 1, 8, 1, true );
  
  	geometry.applyMatrix( new THREE.Matrix4().makeTranslation( 0, -0.5, 0 ) );
  	geometry.applyMatrix( new THREE.Matrix4().makeRotationX( - Math.PI / 2 ) );
  
  	var material = new THREE.MeshBasicMaterial( { wireframe: true, fog: false } );
  	
  	this.cone = new THREE.Mesh( geometry, material );
  	this.add( this.cone );
  
  	this.update();
  
  };
  
  THREE.SpotLightHelper.prototype = Object.create( THREE.Object3D.prototype );
  
  THREE.SpotLightHelper.prototype.dispose = function () {
  	this.cone.geometry.dispose();
  	this.cone.material.dispose();
  };
  
  THREE.SpotLightHelper.prototype.update = function () {
  
  	var vector = new THREE.Vector3();
  	var vector2 = new THREE.Vector3();
  
  	return function () {
  
  		var coneLength = this.light.distance ? this.light.distance : 10000;
  		var coneWidth = coneLength * Math.tan( this.light.angle );
  
  		this.cone.scale.set( coneWidth, coneWidth, coneLength );
  
  		vector.getPositionFromMatrix( this.light.matrixWorld );
  		vector2.getPositionFromMatrix( this.light.target.matrixWorld );
  
  		this.cone.lookAt( vector2.sub( vector ) );
  
  		this.cone.material.color.copy( this.light.color ).multiplyScalar( this.light.intensity );
  
  	};
  
  }();
  