examples/webgl_lights_hemisphere.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - lights - hemisphere light</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: #fff;
				color: #111;
				margin: 0px;
				overflow: hidden;
				font-family: Monospace;
				font-size: 13px;
			}

			#info {
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
				text-align: center;
			}

			a {
				color: #0080ff;
				text-decoration: none;
			}

			a:hover {
				color: #f00;
			}

			#footer { width: 100%; margin: 2em auto; text-align: center; position: absolute; bottom: 0 }
			strong { color: red }
		</style>
	</head>
	<body>

		<div id="container"></div>
		<div id="info">
			<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl hemisphere light example -
			flamingo by <a href="http://mirada.com/">mirada</a> from <a href="http://ro.me">rome</a><br/>
		</div>
		<div id="footer">
			press <strong>h</strong> to toggle hemisphere light, <strong>d</strong> to toggle directional light
		</div>

		<script src="../build/three.js"></script>

		<script src="js/WebGL.js"></script>
		<script src="js/libs/stats.min.js"></script>
		<script src="js/loaders/GLTFLoader.js"></script>

		<script type="x-shader/x-vertex" id="vertexShader">

			varying vec3 vWorldPosition;

			void main() {

				vec4 worldPosition = modelMatrix * vec4( position, 1.0 );
				vWorldPosition = worldPosition.xyz;

				gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

			}

		</script>

		<script type="x-shader/x-fragment" id="fragmentShader">

			uniform vec3 topColor;
			uniform vec3 bottomColor;
			uniform float offset;
			uniform float exponent;

			varying vec3 vWorldPosition;

			void main() {

				float h = normalize( vWorldPosition + offset ).y;
				gl_FragColor = vec4( mix( bottomColor, topColor, max( pow( max( h , 0.0), exponent ), 0.0 ) ), 1.0 );

			}

		</script>

		<script>

			if ( WEBGL.isWebGLAvailable() === false ) {

				document.body.appendChild( WEBGL.getWebGLErrorMessage() );

			}

			var camera, scene, renderer, dirLight, dirLightHeper, hemiLight, hemiLightHelper;
			var mixers = [];
			var stats;

			var clock = new THREE.Clock();

			init();
			animate();

			function init() {

				var container = document.getElementById( 'container' );

				camera = new THREE.PerspectiveCamera( 30, window.innerWidth / window.innerHeight, 1, 5000 );
				camera.position.set( 0, 0, 250 );

				scene = new THREE.Scene();
				scene.background = new THREE.Color().setHSL( 0.6, 0, 1 );
				scene.fog = new THREE.Fog( scene.background, 1, 5000 );

				// LIGHTS

				hemiLight = new THREE.HemisphereLight( 0xffffff, 0xffffff, 0.6 );
				hemiLight.color.setHSL( 0.6, 1, 0.6 );
				hemiLight.groundColor.setHSL( 0.095, 1, 0.75 );
				hemiLight.position.set( 0, 50, 0 );
				scene.add( hemiLight );

				hemiLightHelper = new THREE.HemisphereLightHelper( hemiLight, 10 );
				scene.add( hemiLightHelper );

				//

				dirLight = new THREE.DirectionalLight( 0xffffff, 1 );
				dirLight.color.setHSL( 0.1, 1, 0.95 );
				dirLight.position.set( - 1, 1.75, 1 );
				dirLight.position.multiplyScalar( 30 );
				scene.add( dirLight );

				dirLight.castShadow = true;

				dirLight.shadow.mapSize.width = 2048;
				dirLight.shadow.mapSize.height = 2048;

				var d = 50;

				dirLight.shadow.camera.left = - d;
				dirLight.shadow.camera.right = d;
				dirLight.shadow.camera.top = d;
				dirLight.shadow.camera.bottom = - d;

				dirLight.shadow.camera.far = 3500;
				dirLight.shadow.bias = - 0.0001;

				dirLightHeper = new THREE.DirectionalLightHelper( dirLight, 10 );
				scene.add( dirLightHeper );

				// GROUND

				var groundGeo = new THREE.PlaneBufferGeometry( 10000, 10000 );
				var groundMat = new THREE.MeshLambertMaterial( { color: 0xffffff } );
				groundMat.color.setHSL( 0.095, 1, 0.75 );

				var ground = new THREE.Mesh( groundGeo, groundMat );
				ground.position.y = - 33;
				ground.rotation.x = - Math.PI / 2;
				ground.receiveShadow = true;
				scene.add( ground );

				// SKYDOME

				var vertexShader = document.getElementById( 'vertexShader' ).textContent;
				var fragmentShader = document.getElementById( 'fragmentShader' ).textContent;
				var uniforms = {
					"topColor": { value: new THREE.Color( 0x0077ff ) },
					"bottomColor": { value: new THREE.Color( 0xffffff ) },
					"offset": { value: 33 },
					"exponent": { value: 0.6 }
				};
				uniforms[ "topColor" ].value.copy( hemiLight.color );

				scene.fog.color.copy( uniforms[ "bottomColor" ].value );

				var skyGeo = new THREE.SphereBufferGeometry( 4000, 32, 15 );
				var skyMat = new THREE.ShaderMaterial( {
					uniforms: uniforms,
					vertexShader: vertexShader,
					fragmentShader: fragmentShader,
					side: THREE.BackSide
				} );

				var sky = new THREE.Mesh( skyGeo, skyMat );
				scene.add( sky );

				// MODEL

				var loader = new THREE.GLTFLoader();

				loader.load( 'models/gltf/Flamingo.glb', function ( gltf ) {

					var mesh = gltf.scene.children[ 0 ];

					var s = 0.35;
					mesh.scale.set( s, s, s );
					mesh.position.y = 15;
					mesh.rotation.y = - 1;

					mesh.castShadow = true;
					mesh.receiveShadow = true;

					scene.add( mesh );

					var mixer = new THREE.AnimationMixer( mesh );
					mixer.clipAction( gltf.animations[ 0 ] ).setDuration( 1 ).play();
					mixers.push( mixer );

				} );

				// RENDERER

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

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

				renderer.shadowMap.enabled = true;

				// STATS

				stats = new Stats();
				container.appendChild( stats.dom );

				//

				window.addEventListener( 'resize', onWindowResize, false );
				document.addEventListener( 'keydown', onKeyDown, false );

			}

			function onWindowResize() {

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

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

			}

			function onKeyDown( event ) {

				switch ( event.keyCode ) {

					case 72: // h

						hemiLight.visible = ! hemiLight.visible;
						hemiLightHelper.visible = ! hemiLightHelper.visible;
						break;

					case 68: // d

						dirLight.visible = ! dirLight.visible;
						dirLightHeper.visible = ! dirLightHeper.visible;
						break;

				}

			}

			//

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				var delta = clock.getDelta();

				for ( var i = 0; i < mixers.length; i ++ ) {

					mixers[ i ].update( delta );

				}

				renderer.render( scene, camera );

			}

		</script>
	</body>
</html>