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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webaudio - timing</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">
- </head>
- <body>
- <div id="overlay">
- <button id="startButton">Play</button>
- </div>
- <div id="container"></div>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> webaudio - timing<br/>
- sound effect by <a href="https://freesound.org/people/michorvath/sounds/269718/" target="_blank" rel="noopener noreferrer">michorvath</a>
- </div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- let scene, camera, renderer, clock;
- const objects = [];
- const speed = 2.5;
- const height = 3;
- const offset = 0.5;
- const startButton = document.getElementById( 'startButton' );
- startButton.addEventListener( 'click', init );
- function init() {
- const overlay = document.getElementById( 'overlay' );
- overlay.remove();
- const container = document.getElementById( 'container' );
- scene = new THREE.Scene();
- clock = new THREE.Clock();
- //
- camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 100 );
- camera.position.set( 7, 3, 7 );
- // lights
- const ambientLight = new THREE.AmbientLight( 0xcccccc );
- scene.add( ambientLight );
- const directionalLight = new THREE.DirectionalLight( 0xffffff, 2.5 );
- directionalLight.position.set( 0, 5, 5 );
- scene.add( directionalLight );
- const d = 5;
- directionalLight.castShadow = true;
- directionalLight.shadow.camera.left = - d;
- directionalLight.shadow.camera.right = d;
- directionalLight.shadow.camera.top = d;
- directionalLight.shadow.camera.bottom = - d;
- directionalLight.shadow.camera.near = 1;
- directionalLight.shadow.camera.far = 20;
- directionalLight.shadow.mapSize.x = 1024;
- directionalLight.shadow.mapSize.y = 1024;
- // audio
- const audioLoader = new THREE.AudioLoader();
- const listener = new THREE.AudioListener();
- camera.add( listener );
- // floor
- const floorGeometry = new THREE.PlaneGeometry( 10, 10 );
- const floorMaterial = new THREE.MeshLambertMaterial( { color: 0x4676b6 } );
- const floor = new THREE.Mesh( floorGeometry, floorMaterial );
- floor.rotation.x = Math.PI * - 0.5;
- floor.receiveShadow = true;
- scene.add( floor );
- // objects
- const count = 5;
- const radius = 3;
- const ballGeometry = new THREE.SphereGeometry( 0.3, 32, 16 );
- ballGeometry.translate( 0, 0.3, 0 );
- const ballMaterial = new THREE.MeshLambertMaterial( { color: 0xcccccc } );
- // create objects when audio buffer is loaded
- audioLoader.load( 'sounds/ping_pong.mp3', function ( buffer ) {
- for ( let i = 0; i < count; i ++ ) {
- const s = i / count * Math.PI * 2;
- const ball = new THREE.Mesh( ballGeometry, ballMaterial );
- ball.castShadow = true;
- ball.userData.down = false;
- ball.position.x = radius * Math.cos( s );
- ball.position.z = radius * Math.sin( s );
- const audio = new THREE.PositionalAudio( listener );
- audio.setBuffer( buffer );
- ball.add( audio );
- scene.add( ball );
- objects.push( ball );
- }
- renderer.setAnimationLoop( animate );
- } );
- //
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.shadowMap.enabled = true;
- container.appendChild( renderer.domElement );
- //
- const controls = new OrbitControls( camera, renderer.domElement );
- controls.minDistance = 1;
- controls.maxDistance = 25;
- //
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- }
- function animate() {
- const time = clock.getElapsedTime();
- for ( let i = 0; i < objects.length; i ++ ) {
- const ball = objects[ i ];
- const previousHeight = ball.position.y;
- ball.position.y = Math.abs( Math.sin( i * offset + ( time * speed ) ) * height );
- if ( ball.position.y < previousHeight ) {
- ball.userData.down = true;
- } else {
- if ( ball.userData.down === true ) {
- // ball changed direction from down to up
- const audio = ball.children[ 0 ];
- audio.play(); // play audio with perfect timing when ball hits the surface
- ball.userData.down = false;
- }
- }
- }
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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