examples/webgl_postprocessing_ssao.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - postprocessing - Screen Space Ambient Occlusion</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
		<style>
			body {
				background-color: #aaa;
			}
		</style>
	</head>
	<body>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - screen space ambient occlusion<br/>
		</div>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import Stats from 'three/addons/libs/stats.module.js';
			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
			import { RenderPass } from 'three/addons/postprocessing/RenderPass.js';
			import { SSAOPass } from 'three/addons/postprocessing/SSAOPass.js';
			import { OutputPass } from 'three/addons/postprocessing/OutputPass.js';

			let container, stats;
			let camera, scene, renderer;
			let composer;
			let group;

			init();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				renderer = new THREE.WebGLRenderer();
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.setAnimationLoop( animate );
				document.body.appendChild( renderer.domElement );

				camera = new THREE.PerspectiveCamera( 65, window.innerWidth / window.innerHeight, 100, 700 );
				camera.position.z = 500;

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xaaaaaa );

				scene.add( new THREE.DirectionalLight( 0xffffff, 4 ) );
				scene.add( new THREE.AmbientLight( 0xffffff ) );

				group = new THREE.Group();
				scene.add( group );

				const geometry = new THREE.BoxGeometry( 10, 10, 10 );

				for ( let i = 0; i < 100; i ++ ) {

					const material = new THREE.MeshLambertMaterial( {
						color: Math.random() * 0xffffff
					} );

					const mesh = new THREE.Mesh( geometry, material );
					mesh.position.x = Math.random() * 400 - 200;
					mesh.position.y = Math.random() * 400 - 200;
					mesh.position.z = Math.random() * 400 - 200;
					mesh.rotation.x = Math.random();
					mesh.rotation.y = Math.random();
					mesh.rotation.z = Math.random();

					mesh.scale.setScalar( Math.random() * 10 + 2 );
					group.add( mesh );

				}

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

				const width = window.innerWidth;
				const height = window.innerHeight;

				composer = new EffectComposer( renderer );

				const renderPass = new RenderPass( scene, camera );
				composer.addPass( renderPass );

				const ssaoPass = new SSAOPass( scene, camera, width, height );
				composer.addPass( ssaoPass );

				const outputPass = new OutputPass();
				composer.addPass( outputPass );

				// Init gui
				const gui = new GUI();

				gui.add( ssaoPass, 'output', {
					'Default': SSAOPass.OUTPUT.Default,
					'SSAO Only': SSAOPass.OUTPUT.SSAO,
					'SSAO Only + Blur': SSAOPass.OUTPUT.Blur,
					'Depth': SSAOPass.OUTPUT.Depth,
					'Normal': SSAOPass.OUTPUT.Normal
				} ).onChange( function ( value ) {

					ssaoPass.output = value;

				} );
				gui.add( ssaoPass, 'kernelRadius' ).min( 0 ).max( 32 );
				gui.add( ssaoPass, 'minDistance' ).min( 0.001 ).max( 0.02 );
				gui.add( ssaoPass, 'maxDistance' ).min( 0.01 ).max( 0.3 );
				gui.add( ssaoPass, 'enabled' );

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				const width = window.innerWidth;
				const height = window.innerHeight;

				camera.aspect = width / height;
				camera.updateProjectionMatrix();

				renderer.setSize( width, height );
				composer.setSize( width, height );

			}

			function animate() {

				stats.begin();
				render();
				stats.end();

			}

			function render() {

				const timer = performance.now();
				group.rotation.x = timer * 0.0002;
				group.rotation.y = timer * 0.0001;

				composer.render();

			}

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