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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 - additive animation - skinning</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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+ <style>
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+ a {
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+ color: blue;
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+ }
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+ .ac { /* prevent dat-gui from being selected */
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+ -webkit-user-select: none;
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+ -moz-user-select: none;
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+ -ms-user-select: none;
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+ user-select: none;
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+ }
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+ .control-inactive {
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+ color: #888;
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+ }
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+ </style>
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+ </head>
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+ <body>
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+ <div id="container"></div>
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - Skeletal Additive Animation Blending
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+ (model from <a href="https://www.mixamo.com/" target="_blank" rel="noopener">mixamo.com</a>)<br/>
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+ </div>
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+
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+ <script type="module">
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+
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+ import * as THREE from '../build/three.module.js';
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+
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+ import Stats from './jsm/libs/stats.module.js';
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+ import { GUI } from './jsm/libs/dat.gui.module.js';
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+ import { OrbitControls } from './jsm/controls/OrbitControls.js';
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+ import { GLTFLoader } from './jsm/loaders/GLTFLoader.js';
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+
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+ var scene, renderer, camera, stats;
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+ var model, skeleton, mixer, clock;
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+
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+ var crossFadeControls = [];
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+
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+ var currentBaseAction = 'idle';
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+ const allActions = [];
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+ const baseActions = {
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+ idle: { weight: 1 },
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+ walk: { weight: 0 },
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+ run: { weight: 0 }
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+ };
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+ const additiveActions = {
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+ sneak_pose: { weight: 0 },
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+ sad_pose: { weight: 0 },
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+ agree: { weight: 0 },
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+ headShake: { weight: 0 }
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+ }
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+ var panelSettings, numAnimations;
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+
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+ init();
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+
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+ function init() {
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+
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+ var container = document.getElementById( 'container' );
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+ clock = new THREE.Clock();
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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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+ renderer.outputEncoding = THREE.sRGBEncoding;
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+ renderer.shadowMap.enabled = true;
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+ container.appendChild( renderer.domElement );
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+
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+ // camera
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+ camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 1000 );
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+ var controls = new OrbitControls( camera, renderer.domElement );
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+ camera.position.set( -1, 2, 3 );
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+ camera.lookAt( 0, 1, 0 );
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+ controls.target = new THREE.Vector3( 0, 1, 0 );
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+ controls.update();
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+
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+ stats = new Stats();
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+ container.appendChild( stats.dom );
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+
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+ scene = new THREE.Scene();
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+ scene.background = new THREE.Color( 0xa0a0a0 );
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+ scene.fog = new THREE.Fog( 0xa0a0a0, 10, 50 );
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+
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+ var hemiLight = new THREE.HemisphereLight( 0xffffff, 0x444444 );
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+ hemiLight.position.set( 0, 20, 0 );
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+ scene.add( hemiLight );
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+
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+ var dirLight = new THREE.DirectionalLight( 0xffffff );
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+ dirLight.position.set( - 3, 10, - 10 );
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+ dirLight.castShadow = true;
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+ dirLight.shadow.camera.top = 2;
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+ dirLight.shadow.camera.bottom = - 2;
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+ dirLight.shadow.camera.left = - 2;
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+ dirLight.shadow.camera.right = 2;
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+ dirLight.shadow.camera.near = 0.1;
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+ dirLight.shadow.camera.far = 40;
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+ scene.add( dirLight );
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+
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+ // ground
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+
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+ var mesh = new THREE.Mesh( new THREE.PlaneBufferGeometry( 100, 100 ), new THREE.MeshPhongMaterial( { color: 0x999999, depthWrite: false } ) );
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+ mesh.rotation.x = - Math.PI / 2;
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+ mesh.receiveShadow = true;
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+ scene.add( mesh );
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+
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+ var loader = new GLTFLoader();
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+ loader.load( 'models/gltf/Xbot.glb', function ( gltf ) {
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+
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+ model = gltf.scene;
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+ scene.add( model );
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+
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+ model.traverse( function ( object ) {
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+
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+ if ( object.isMesh ) object.castShadow = true;
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+
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+ } );
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+
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+ skeleton = new THREE.SkeletonHelper( model );
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+ skeleton.visible = false;
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+ scene.add( skeleton );
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+
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+ var animations = gltf.animations;
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+ mixer = new THREE.AnimationMixer( model );
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+
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+ numAnimations = animations.length;
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+
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+ for ( let i = 0; i !== numAnimations; ++ i ) {
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+
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+ let clip = animations[ i ];
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+ const name = clip.name;
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+
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+ if ( baseActions[ name ] ) {
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+
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+ const action = mixer.clipAction( clip, undefined, false );
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+ activateAction( action );
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+ baseActions[ name ].action = action;
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+ allActions.push( action );
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+
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+ } else if ( additiveActions[ name ] ) {
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+
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+ // Make the clip additive and remove the reference frame
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+
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+ THREE.AnimationUtils.makeClipAdditive( clip );
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+
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+ if ( clip.name.endsWith( '_pose' ) ) {
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+
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+ clip = THREE.AnimationUtils.subclip( clip, clip.name, 2, 3, 30 );
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+
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+ }
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+
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+ const action = mixer.clipAction( clip, undefined, true );
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+ activateAction( action );
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+ additiveActions[ name ].action = action;
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+ allActions.push( action );
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+
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+ }
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+
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+ }
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+
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+ createPanel();
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+
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+ animate();
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+
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+ } );
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+
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+ }
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+
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+ function createPanel() {
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+
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+ var panel = new GUI( { width: 310 } );
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+
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+ var folder1 = panel.addFolder( 'Base Actions' );
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+ var folder2 = panel.addFolder( 'Additive Action Weights' );
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+ var folder3 = panel.addFolder( 'General Speed' );
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+
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+ panelSettings = {
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+ 'modify time scale': 1.0
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+ };
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+
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+ const baseNames = [ 'None', ...Object.keys( baseActions ) ];
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+
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+ for ( let i = 0, l = baseNames.length; i !== l; ++ i ) {
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+
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+ const name = baseNames[ i ];
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+ const settings = baseActions[ name ];
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+ panelSettings[ name ] = function () {
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+
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+ const currentSettings = baseActions[ currentBaseAction ];
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+ const currentAction = currentSettings ? currentSettings.action : null;
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+ const action = settings ? settings.action : null;
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+
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+ prepareCrossFade( currentAction, action, 0.35 );
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+
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+ }
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+
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+ crossFadeControls.push( folder1.add( panelSettings, name ) );
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+
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+ }
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+
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+ for ( const name of Object.keys( additiveActions ) ) {
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+
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+ const settings = additiveActions[ name ];
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+
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+ const panelName = `modify ${name} weight`;
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+ panelSettings[ name ] = settings.weight;
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+ folder2.add( panelSettings, name, 0.0, 1.0, 0.01 ).listen().onChange( function ( weight ) {
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+
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+ setWeight( settings.action, weight );
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+ settings.weight = weight;
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+
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+ } );
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+
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+ }
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+
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+ folder3.add( panelSettings, 'modify time scale', 0.0, 1.5, 0.01 ).onChange( modifyTimeScale );
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+
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+ folder1.open();
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+ folder2.open();
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+ folder3.open();
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+
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+ crossFadeControls.forEach( function ( control ) {
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+
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+ control.classList1 = control.domElement.parentElement.parentElement.classList;
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+ control.classList2 = control.domElement.previousElementSibling.classList;
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+
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+ control.setInactive = function () {
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+
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+ control.classList2.add( 'control-inactive' );
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+
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+ };
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+
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+ control.setActive = function () {
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+
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+ control.classList2.remove( 'control-inactive' );
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+
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+ };
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+
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+ const settings = baseActions[ control.property ];
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+
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+ if ( !settings || !settings.weight ) {
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+
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+ control.setInactive();
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+ }
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+
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+ } );
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+
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+ }
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+
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+ function activateAction( action ) {
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+
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+ const clip = action.getClip();
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+ const settings = baseActions[ clip.name ] || additiveActions[ clip.name ];
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+ setWeight( action, settings.weight );
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+ action.play();
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+
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+ }
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+
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+ function modifyTimeScale( speed ) {
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+
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+ mixer.timeScale = speed;
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+
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+ }
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+
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+ function prepareCrossFade( startAction, endAction, duration ) {
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+
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+ // If the current action is 'idle', execute the crossfade immediately;
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+ // else wait until the current action has finished its current loop
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+
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+ if ( currentBaseAction === 'idle' || ! startAction || ! endAction ) {
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+
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+ executeCrossFade( startAction, endAction, duration );
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+
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+ } else {
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+
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+ synchronizeCrossFade( startAction, endAction, duration );
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+
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+ }
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+
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+ // Update control colors
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+
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+ if ( endAction ) {
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+
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+ const clip = endAction.getClip();
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+ currentBaseAction = clip.name;
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+
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+ } else {
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+
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+ currentBaseAction = 'None';
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+
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+ }
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+
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+ crossFadeControls.forEach( function ( control ) {
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+
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+ const name = control.property;
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+
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+ if ( name === currentBaseAction ) {
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+
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+ control.setActive();
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+
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+ } else {
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+
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+ control.setInactive();
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+
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+ }
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+
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+ } );
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+
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+ }
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+
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+ function synchronizeCrossFade( startAction, endAction, duration ) {
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+
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+ mixer.addEventListener( 'loop', onLoopFinished );
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+
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+ function onLoopFinished( event ) {
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+
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+ if ( event.action === startAction ) {
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+
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+ mixer.removeEventListener( 'loop', onLoopFinished );
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+
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+ executeCrossFade( startAction, endAction, duration );
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+
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+ }
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+
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+ }
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+
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+ }
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+
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+ function executeCrossFade( startAction, endAction, duration ) {
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+
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+ // Not only the start action, but also the end action must get a weight of 1 before fading
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+ // (concerning the start action this is already guaranteed in this place)
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+
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+ if ( endAction ) {
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+
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+ setWeight( endAction, 1 );
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+ endAction.time = 0;
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+
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+ if ( startAction ) {
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+
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+ // Crossfade with warping
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+
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+ startAction.crossFadeTo( endAction, duration, true );
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+
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+ } else {
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+
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+ // Fade in
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+
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+ endAction.fadeIn( duration );
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+
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+ }
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+
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+ } else {
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+
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+ // Fade out
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+
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+ startAction.fadeOut( duration );
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+
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+ }
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+
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+ }
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+
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+ // This function is needed, since animationAction.crossFadeTo() disables its start action and sets
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+ // the start action's timeScale to ((start animation's duration) / (end animation's duration))
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+
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+ function setWeight( action, weight ) {
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+
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+ action.enabled = true;
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+ action.setEffectiveTimeScale( 1 );
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+ action.setEffectiveWeight( weight );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ function animate() {
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+
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+ // Render loop
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+
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+ requestAnimationFrame( animate );
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+
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+ for ( let i = 0; i !== numAnimations; ++ i ) {
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+
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+ const action = allActions[ i ];
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+ const clip = action.getClip();
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+ const settings = baseActions[ clip.name ] || additiveActions[ clip.name ];
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+ settings.weight = action.getEffectiveWeight();
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+
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+ }
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+
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+ // Get the time elapsed since the last frame, used for mixer update
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+
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+ var mixerUpdateDelta = clock.getDelta();
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+
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+ // Update the animation mixer, the stats panel, and render this frame
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+
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+ mixer.update( mixerUpdateDelta );
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+
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+ stats.update();
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+
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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Christine Morten