three.js/src/extras/helpers/PointLightHelper.js

/**
 * @author alteredq / http://alteredqualia.com/
 * @author mrdoob / http://mrdoob.com/
 */

THREE.PointLightHelper = function ( light, sphereSize ) {

	this.light = light;
	this.light.updateMatrixWorld();

	var geometry = new THREE.SphereGeometry( sphereSize, 4, 2 );
	var material = new THREE.MeshBasicMaterial( { wireframe: true, fog: false } );
	material.color.copy( this.light.color ).multiplyScalar( this.light.intensity );

	THREE.Mesh.call( this, geometry, material );

	this.matrixWorld = this.light.matrixWorld;
	this.matrixAutoUpdate = false;

	/*
	var distanceGeometry = new THREE.IcosahedronGeometry( 1, 2 );
	var distanceMaterial = new THREE.MeshBasicMaterial( { color: hexColor, fog: false, wireframe: true, opacity: 0.1, transparent: true } );

	this.lightSphere = new THREE.Mesh( bulbGeometry, bulbMaterial );
	this.lightDistance = new THREE.Mesh( distanceGeometry, distanceMaterial );

	var d = light.distance;

	if ( d === 0.0 ) {

		this.lightDistance.visible = false;

	} else {

		this.lightDistance.scale.set( d, d, d );

	}

	this.add( this.lightDistance );
	*/

};

THREE.PointLightHelper.prototype = Object.create( THREE.Mesh.prototype );

THREE.PointLightHelper.prototype.update = function () {

	this.material.color.copy( this.light.color ).multiplyScalar( this.light.intensity );

	/*
	var d = this.light.distance;

	if ( d === 0.0 ) {

		this.lightDistance.visible = false;

	} else {

		this.lightDistance.visible = true;
		this.lightDistance.scale.set( d, d, d );

	}
	*/

};