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webgl_animation_skinning_additive_blending.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Verge3D webgl - additive animation - skinning</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>
a {
color: blue;
}
.control-inactive button {
color: #888;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info">
<a href="https://www.soft8soft.com/verge3d" target="_blank" rel="noopener">Verge3D</a> - Skeletal Additive Animation Blending
(model from <a href="https://www.mixamo.com/" target="_blank" rel="noopener">mixamo.com</a>)<br/>
</div>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"v3d": "../build/v3d.module.js",
"v3d/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as v3d from 'v3d';
import Stats from 'v3d/addons/libs/stats.module.js';
import { GUI } from 'v3d/addons/libs/lil-gui.module.min.js';
import { OrbitControls } from 'v3d/addons/controls/OrbitControls.js';
import { GLTFLoader } from 'v3d/addons/loaders/GLTFLoader.js';
let scene, renderer, camera, stats;
let model, skeleton, mixer, clock;
const crossFadeControls = [];
let currentBaseAction = 'idle';
const allActions = [];
const baseActions = {
idle: { weight: 1 },
walk: { weight: 0 },
run: { weight: 0 }
};
const additiveActions = {
sneak_pose: { weight: 0 },
sad_pose: { weight: 0 },
agree: { weight: 0 },
headShake: { weight: 0 }
};
let panelSettings, numAnimations;
init();
function init() {
const container = document.getElementById('container');
clock = new v3d.Clock();
scene = new v3d.Scene();
scene.background = new v3d.Color(0xa0a0a0);
scene.fog = new v3d.Fog(0xa0a0a0, 10, 50);
const hemiLight = new v3d.HemisphereLight(0xffffff, 0x444444);
hemiLight.position.set(0, 20, 0);
scene.add(hemiLight);
const dirLight = new v3d.DirectionalLight(0xffffff);
dirLight.position.set(3, 10, 10);
dirLight.castShadow = true;
dirLight.shadow.camera.top = 2;
dirLight.shadow.camera.bottom = -2;
dirLight.shadow.camera.left = -2;
dirLight.shadow.camera.right = 2;
dirLight.shadow.camera.near = 0.1;
dirLight.shadow.camera.far = 40;
scene.add(dirLight);
// ground
const mesh = new v3d.Mesh(new v3d.PlaneGeometry(100, 100), new v3d.MeshPhongMaterial({ color: 0x999999, depthWrite: false }));
mesh.rotation.x = - Math.PI / 2;
mesh.receiveShadow = true;
scene.add(mesh);
const loader = new GLTFLoader();
loader.load('models/gltf/Xbot.glb', function(gltf) {
model = gltf.scene;
scene.add(model);
model.traverse(function(object) {
if (object.isMesh) object.castShadow = true;
});
skeleton = new v3d.SkeletonHelper(model);
skeleton.visible = false;
scene.add(skeleton);
const animations = gltf.animations;
mixer = new v3d.AnimationMixer(model);
numAnimations = animations.length;
for (let i = 0; i !== numAnimations; ++ i) {
let clip = animations[i];
const name = clip.name;
if (baseActions[name]) {
const action = mixer.clipAction(clip);
activateAction(action);
baseActions[name].action = action;
allActions.push(action);
} else if (additiveActions[name]) {
// Make the clip additive and remove the reference frame
v3d.AnimationUtils.makeClipAdditive(clip);
if (clip.name.endsWith('_pose')) {
clip = v3d.AnimationUtils.subclip(clip, clip.name, 2, 3, 30);
}
const action = mixer.clipAction(clip);
activateAction(action);
additiveActions[name].action = action;
allActions.push(action);
}
}
createPanel();
animate();
});
renderer = new v3d.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.outputEncoding = v3d.sRGBEncoding;
renderer.shadowMap.enabled = true;
container.appendChild(renderer.domElement);
// camera
camera = new v3d.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 100);
camera.position.set(- 1, 2, 3);
const controls = new OrbitControls(camera, renderer.domElement);
controls.enablePan = false;
controls.enableZoom = false;
controls.target.set(0, 1, 0);
controls.update();
stats = new Stats();
container.appendChild(stats.dom);
window.addEventListener('resize', onWindowResize);
}
function createPanel() {
const panel = new GUI({ width: 310 });
const folder1 = panel.addFolder('Base Actions');
const folder2 = panel.addFolder('Additive Action Weights');
const folder3 = panel.addFolder('General Speed');
panelSettings = {
'modify time scale': 1.0
};
const baseNames = ['None', ...Object.keys(baseActions)];
for (let i = 0, l = baseNames.length; i !== l; ++ i) {
const name = baseNames[i];
const settings = baseActions[name];
panelSettings[name] = function() {
const currentSettings = baseActions[currentBaseAction];
const currentAction = currentSettings ? currentSettings.action : null;
const action = settings ? settings.action : null;
if (currentAction !== action) {
prepareCrossFade(currentAction, action, 0.35);
}
};
crossFadeControls.push(folder1.add(panelSettings, name));
}
for (const name of Object.keys(additiveActions)) {
const settings = additiveActions[name];
panelSettings[name] = settings.weight;
folder2.add(panelSettings, name, 0.0, 1.0, 0.01).listen().onChange(function(weight) {
setWeight(settings.action, weight);
settings.weight = weight;
});
}
folder3.add(panelSettings, 'modify time scale', 0.0, 1.5, 0.01).onChange(modifyTimeScale);
folder1.open();
folder2.open();
folder3.open();
crossFadeControls.forEach(function(control) {
control.setInactive = function() {
control.domElement.classList.add('control-inactive');
};
control.setActive = function() {
control.domElement.classList.remove('control-inactive');
};
const settings = baseActions[control.property];
if (!settings || ! settings.weight) {
control.setInactive();
}
});
}
function activateAction(action) {
const clip = action.getClip();
const settings = baseActions[clip.name] || additiveActions[clip.name];
setWeight(action, settings.weight);
action.play();
}
function modifyTimeScale(speed) {
mixer.timeScale = speed;
}
function prepareCrossFade(startAction, endAction, duration) {
// If the current action is 'idle', execute the crossfade immediately;
// else wait until the current action has finished its current loop
if (currentBaseAction === 'idle' || ! startAction || ! endAction) {
executeCrossFade(startAction, endAction, duration);
} else {
synchronizeCrossFade(startAction, endAction, duration);
}
// Update control colors
if (endAction) {
const clip = endAction.getClip();
currentBaseAction = clip.name;
} else {
currentBaseAction = 'None';
}
crossFadeControls.forEach(function(control) {
const name = control.property;
if (name === currentBaseAction) {
control.setActive();
} else {
control.setInactive();
}
});
}
function synchronizeCrossFade(startAction, endAction, duration) {
mixer.addEventListener('loop', onLoopFinished);
function onLoopFinished(event) {
if (event.action === startAction) {
mixer.removeEventListener('loop', onLoopFinished);
executeCrossFade(startAction, endAction, duration);
}
}
}
function executeCrossFade(startAction, endAction, duration) {
// Not only the start action, but also the end action must get a weight of 1 before fading
// (concerning the start action this is already guaranteed in this place)
if (endAction) {
setWeight(endAction, 1);
endAction.time = 0;
if (startAction) {
// Crossfade with warping
startAction.crossFadeTo(endAction, duration, true);
} else {
// Fade in
endAction.fadeIn(duration);
}
} else {
// Fade out
startAction.fadeOut(duration);
}
}
// This function is needed, since animationAction.crossFadeTo() disables its start action and sets
// the start action's timeScale to ((start animation's duration) / (end animation's duration))
function setWeight(action, weight) {
action.enabled = true;
action.setEffectiveTimeScale(1);
action.setEffectiveWeight(weight);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
// Render loop
requestAnimationFrame(animate);
for (let i = 0; i !== numAnimations; ++ i) {
const action = allActions[i];
const clip = action.getClip();
const settings = baseActions[clip.name] || additiveActions[clip.name];
settings.weight = action.getEffectiveWeight();
}
// Get the time elapsed since the last frame, used for mixer update
const mixerUpdateDelta = clock.getDelta();
// Update the animation mixer, the stats panel, and render this frame
mixer.update(mixerUpdateDelta);
stats.update();
renderer.render(scene, camera);
}
</script>
</body>
</html>