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158 lines
4.3 KiB
158 lines
4.3 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - animation - basic</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - animation - basic use
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import Stats from 'three/addons/libs/stats.module.js';
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let stats, clock;
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let scene, camera, renderer, mixer;
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init();
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animate();
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function init() {
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scene = new THREE.Scene();
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//
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camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
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camera.position.set( 25, 25, 50 );
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camera.lookAt( scene.position );
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//
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const axesHelper = new THREE.AxesHelper( 10 );
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scene.add( axesHelper );
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//
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const geometry = new THREE.BoxGeometry( 5, 5, 5 );
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const material = new THREE.MeshBasicMaterial( { color: 0xffffff, transparent: true } );
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const mesh = new THREE.Mesh( geometry, material );
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scene.add( mesh );
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// create a keyframe track (i.e. a timed sequence of keyframes) for each animated property
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// Note: the keyframe track type should correspond to the type of the property being animated
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// POSITION
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const positionKF = new THREE.VectorKeyframeTrack( '.position', [ 0, 1, 2 ], [ 0, 0, 0, 30, 0, 0, 0, 0, 0 ] );
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// SCALE
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const scaleKF = new THREE.VectorKeyframeTrack( '.scale', [ 0, 1, 2 ], [ 1, 1, 1, 2, 2, 2, 1, 1, 1 ] );
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// ROTATION
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// Rotation should be performed using quaternions, using a THREE.QuaternionKeyframeTrack
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// Interpolating Euler angles (.rotation property) can be problematic and is currently not supported
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// set up rotation about x axis
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const xAxis = new THREE.Vector3( 1, 0, 0 );
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const qInitial = new THREE.Quaternion().setFromAxisAngle( xAxis, 0 );
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const qFinal = new THREE.Quaternion().setFromAxisAngle( xAxis, Math.PI );
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const quaternionKF = new THREE.QuaternionKeyframeTrack( '.quaternion', [ 0, 1, 2 ], [ qInitial.x, qInitial.y, qInitial.z, qInitial.w, qFinal.x, qFinal.y, qFinal.z, qFinal.w, qInitial.x, qInitial.y, qInitial.z, qInitial.w ] );
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// COLOR
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const colorKF = new THREE.ColorKeyframeTrack( '.material.color', [ 0, 1, 2 ], [ 1, 0, 0, 0, 1, 0, 0, 0, 1 ], THREE.InterpolateDiscrete );
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// OPACITY
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const opacityKF = new THREE.NumberKeyframeTrack( '.material.opacity', [ 0, 1, 2 ], [ 1, 0, 1 ] );
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// create an animation sequence with the tracks
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// If a negative time value is passed, the duration will be calculated from the times of the passed tracks array
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const clip = new THREE.AnimationClip( 'Action', 3, [ scaleKF, positionKF, quaternionKF, colorKF, opacityKF ] );
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// setup the THREE.AnimationMixer
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mixer = new THREE.AnimationMixer( mesh );
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// create a ClipAction and set it to play
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const clipAction = mixer.clipAction( clip );
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clipAction.play();
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//
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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//
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stats = new Stats();
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document.body.appendChild( stats.dom );
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//
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clock = new THREE.Clock();
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//
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function animate() {
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requestAnimationFrame( animate );
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render();
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}
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function render() {
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const delta = clock.getDelta();
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if ( mixer ) {
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mixer.update( delta );
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}
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renderer.render( scene, camera );
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stats.update();
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}
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</script>
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</body>
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</html>
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