but0n/webgl_lights_spotlight.html

## webgl_lights_spotlight.html
<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - lights - spotlight</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				background-color: #000;
				margin: 0px;
				overflow: hidden;
			}

			#info {
				position: absolute;
				top: 0px; width: 100%;
				color: #ffffff;
				padding: 5px;
				font-family: Monospace;
				font-size: 13px;
				text-align: center;
			}

			a {
				color: #ff0080;
				text-decoration: none;
			}

			a:hover {
				color: #0080ff;
			}
		</style>
	</head>
	<body>

		<div id="info">
			<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - spotlight by <a href="http://master-domain.com" target="_blank" rel="noopener">Master James</a><br />
		</div>

		<script src="../build/three.js"></script>
		<script src="js/controls/OrbitControls.js"></script>
		<script src="js/controls/TransformControls.js"></script>

		<script src="js/libs/dat.gui.min.js"></script>

		<script src="js/Detector.js"></script>

		<script>

			if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

			var renderer, scene, camera;

			var spotLight, lightHelper, shadowCameraHelper;

			var gui;

			function init() {

				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				document.body.appendChild( renderer.domElement );
				renderer.shadowMap.enabled = true;
				renderer.shadowMap.type = THREE.PCFSoftShadowMap;

				renderer.gammaInput = true;
				renderer.gammaOutput = true;

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 35, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 65, 8, - 10 );

				var controls = new THREE.OrbitControls( camera, renderer.domElement );
				controls.addEventListener( 'change', render );
				controls.minDistance = 20;
				controls.maxDistance = 500;
				controls.enablePan = false;

				var ambient = new THREE.AmbientLight( 0xffffff, 0.1 );
				scene.add( ambient );

				spotLight = new THREE.SpotLight( 0xffffff, 1 );
				spotLight.angle = Math.PI / 4;
				spotLight.penumbra = 0.05;
				spotLight.decay = 2;
				spotLight.distance = 200;

				spotLight.castShadow = true;
				spotLight.shadow.mapSize.width = 1024;
				spotLight.shadow.mapSize.height = 1024;
				spotLight.shadow.camera.near = 10;
				spotLight.shadow.camera.far = 200;

				target = new THREE.Object3D();
				target.position.set( 0, 0, 0 );
				spotLight.target = target;


				spotLightGroup = new THREE.Group();
				spotLightGroup.name = 'spotLight';
				spotLightGroup.position.set( 15, 40, 35 );
				spotLightGroup.updateMatrixWorld();
				spotLightGroup.add( spotLight );
				spotLightGroup.add( target );
				scene.add( spotLightGroup );


				transControls = new THREE.TransformControls( camera, renderer.domElement );
				transControls.setSpace( "local" );
				transControls.setMode( "rotate" );
				transControls.attach( spotLightGroup )
				scene.add( transControls );


				lightHelper = new THREE.SpotLightHelper( spotLight );
				scene.add( lightHelper );

				shadowCameraHelper = new THREE.CameraHelper( spotLight.shadow.camera );
				scene.add( shadowCameraHelper );

				scene.add( new THREE.AxesHelper( 10 ) );

				var material = new THREE.MeshPhongMaterial( { color: 0x808080, dithering: true } );

				var geometry = new THREE.PlaneBufferGeometry( 2000, 2000 );

				var mesh = new THREE.Mesh( geometry, material );
				mesh.position.set( 0, - 1, 0 );
				mesh.rotation.x = - Math.PI * 0.5;
				mesh.receiveShadow = true;
				scene.add( mesh );

				var material = new THREE.MeshPhongMaterial( { color: 0x4080ff, dithering: true } );

				var geometry = new THREE.BoxBufferGeometry( 3, 1, 2 );

				var mesh = new THREE.Mesh( geometry, material );
				mesh.position.set( 40, 2, 0 );
				mesh.castShadow = true;
				scene.add( mesh );

				controls.target.copy( mesh.position );
				controls.update();

				window.addEventListener( 'resize', onResize, false );

			}

			function onResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function render() {

				lightHelper.update();

				shadowCameraHelper.update();

				renderer.render( scene, camera );

			}

			function buildGui() {

				gui = new dat.GUI();

				var params = {
					'light color': spotLight.color.getHex(),
					intensity: spotLight.intensity,
					distance: spotLight.distance,
					angle: spotLight.angle,
					penumbra: spotLight.penumbra,
					decay: spotLight.decay
				}

				gui.addColor( params, 'light color' ).onChange( function ( val ) {

					spotLight.color.setHex( val );
					render();

				} );

				gui.add( params, 'intensity', 0, 2 ).onChange( function ( val ) {

					spotLight.intensity = val;
					render();

				} );


				gui.add( params, 'distance', 50, 200 ).onChange( function ( val ) {

					spotLight.distance = val;
					render();

				} );

				gui.add( params, 'angle', 0, Math.PI / 3 ).onChange( function ( val ) {

					spotLight.angle = val;
					render();

				} );

				gui.add( params, 'penumbra', 0, 1 ).onChange( function ( val ) {

					spotLight.penumbra = val;
					render();

				} );

				gui.add( params, 'decay', 1, 2 ).onChange( function ( val ) {

					spotLight.decay = val;
					render();

				} );

				gui.open();

			}

			init();

			buildGui();

			render();

		</script>

	</body>

</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>three.js webgl - lights - spotlight</title>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
	<style>
	body {
	background-color: #000;
	margin: 0px;
	overflow: hidden;
	}

	#info {
	position: absolute;
	top: 0px; width: 100%;
	color: #ffffff;
	padding: 5px;
	font-family: Monospace;
	font-size: 13px;
	text-align: center;
	}

	a {
	color: #ff0080;
	text-decoration: none;
	}

	a:hover {
	color: #0080ff;
	}
	</style>
	</head>
	<body>

	<div id="info">
	<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - spotlight by <a href="http://master-domain.com" target="_blank" rel="noopener">Master James</a><br />
	</div>

	<script src="../build/three.js"></script>
	<script src="js/controls/OrbitControls.js"></script>
	<script src="js/controls/TransformControls.js"></script>

	<script src="js/libs/dat.gui.min.js"></script>

	<script src="js/Detector.js"></script>

	<script>

	if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

	var renderer, scene, camera;

	var spotLight, lightHelper, shadowCameraHelper;

	var gui;

	function init() {

	renderer = new THREE.WebGLRenderer();
	renderer.setPixelRatio( window.devicePixelRatio );
	renderer.setSize( window.innerWidth, window.innerHeight );
	document.body.appendChild( renderer.domElement );
	renderer.shadowMap.enabled = true;
	renderer.shadowMap.type = THREE.PCFSoftShadowMap;

	renderer.gammaInput = true;
	renderer.gammaOutput = true;

	scene = new THREE.Scene();

	camera = new THREE.PerspectiveCamera( 35, window.innerWidth / window.innerHeight, 1, 1000 );
	camera.position.set( 65, 8, - 10 );

	var controls = new THREE.OrbitControls( camera, renderer.domElement );
	controls.addEventListener( 'change', render );
	controls.minDistance = 20;
	controls.maxDistance = 500;
	controls.enablePan = false;

	var ambient = new THREE.AmbientLight( 0xffffff, 0.1 );
	scene.add( ambient );

	spotLight = new THREE.SpotLight( 0xffffff, 1 );
	spotLight.angle = Math.PI / 4;
	spotLight.penumbra = 0.05;
	spotLight.decay = 2;
	spotLight.distance = 200;

	spotLight.castShadow = true;
	spotLight.shadow.mapSize.width = 1024;
	spotLight.shadow.mapSize.height = 1024;
	spotLight.shadow.camera.near = 10;
	spotLight.shadow.camera.far = 200;

	target = new THREE.Object3D();
	target.position.set( 0, 0, 0 );
	spotLight.target = target;


	spotLightGroup = new THREE.Group();
	spotLightGroup.name = 'spotLight';
	spotLightGroup.position.set( 15, 40, 35 );
	spotLightGroup.updateMatrixWorld();
	spotLightGroup.add( spotLight );
	spotLightGroup.add( target );
	scene.add( spotLightGroup );


	transControls = new THREE.TransformControls( camera, renderer.domElement );
	transControls.setSpace( "local" );
	transControls.setMode( "rotate" );
	transControls.attach( spotLightGroup )
	scene.add( transControls );


	lightHelper = new THREE.SpotLightHelper( spotLight );
	scene.add( lightHelper );

	shadowCameraHelper = new THREE.CameraHelper( spotLight.shadow.camera );
	scene.add( shadowCameraHelper );

	scene.add( new THREE.AxesHelper( 10 ) );

	var material = new THREE.MeshPhongMaterial( { color: 0x808080, dithering: true } );

	var geometry = new THREE.PlaneBufferGeometry( 2000, 2000 );

	var mesh = new THREE.Mesh( geometry, material );
	mesh.position.set( 0, - 1, 0 );
	mesh.rotation.x = - Math.PI * 0.5;
	mesh.receiveShadow = true;
	scene.add( mesh );

	var material = new THREE.MeshPhongMaterial( { color: 0x4080ff, dithering: true } );

	var geometry = new THREE.BoxBufferGeometry( 3, 1, 2 );

	var mesh = new THREE.Mesh( geometry, material );
	mesh.position.set( 40, 2, 0 );
	mesh.castShadow = true;
	scene.add( mesh );

	controls.target.copy( mesh.position );
	controls.update();

	window.addEventListener( 'resize', onResize, false );

	}

	function onResize() {

	camera.aspect = window.innerWidth / window.innerHeight;
	camera.updateProjectionMatrix();

	renderer.setSize( window.innerWidth, window.innerHeight );

	}

	function render() {

	lightHelper.update();

	shadowCameraHelper.update();

	renderer.render( scene, camera );

	}

	function buildGui() {

	gui = new dat.GUI();

	var params = {
	'light color': spotLight.color.getHex(),
	intensity: spotLight.intensity,
	distance: spotLight.distance,
	angle: spotLight.angle,
	penumbra: spotLight.penumbra,
	decay: spotLight.decay
	}

	gui.addColor( params, 'light color' ).onChange( function ( val ) {

	spotLight.color.setHex( val );
	render();

	} );

	gui.add( params, 'intensity', 0, 2 ).onChange( function ( val ) {

	spotLight.intensity = val;
	render();

	} );


	gui.add( params, 'distance', 50, 200 ).onChange( function ( val ) {

	spotLight.distance = val;
	render();

	} );

	gui.add( params, 'angle', 0, Math.PI / 3 ).onChange( function ( val ) {

	spotLight.angle = val;
	render();

	} );

	gui.add( params, 'penumbra', 0, 1 ).onChange( function ( val ) {

	spotLight.penumbra = val;
	render();

	} );

	gui.add( params, 'decay', 1, 2 ).onChange( function ( val ) {

	spotLight.decay = val;
	render();

	} );

	gui.open();

	}

	init();

	buildGui();

	render();

	</script>

	</body>

	</html>