Threejs Model

HTML

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - 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="https://threejs.org/examples/main.css">
		<style>
			a {
				color: #f00;
			}
			.no-pointer-events {
				pointer-events: none;
			}
			.control-disabled {
				color: #888;
				text-decoration: line-through;
			}
		</style>
	</head>
	<body>
		<div id="container"></div>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - Skeletal Animation Blending
			(model from <a href="https://www.mixamo.com/" target="_blank" rel="noopener">mixamo.com</a>)<br/>
			Note: crossfades are possible with blend weights being set to (1,0,0), (0,1,0) or (0,0,1)
		</div>

		<script type="module">

			import * as THREE from 'https://threejs.org/build/three.module.js';

			import Stats from 'https://threejs.org/examples/jsm/libs/stats.module.js';
			import { GUI } from 'https://threejs.org/examples/jsm/libs/dat.gui.module.js';

			import { GLTFLoader } from 'https://threejs.org/examples/jsm/loaders/GLTFLoader.js';
			import { SkeletonUtils } from 'https://threejs.org/examples/jsm/utils/SkeletonUtils.js';

			let scene, renderer, camera, stats;
			let model, skeleton, mixer, clock;

			const crossFadeControls = [];

			let idleAction, walkAction, runAction;
			let idleWeight, walkWeight, runWeight;
			let actions, settings;

			let singleStepMode = false;
			let sizeOfNextStep = 0;

			init();

			function init() {

				const container = document.getElementById( 'container' );

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 1, 2, - 3 );
				camera.lookAt( 0, 1, 0 );

				clock = new THREE.Clock();

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xa0a0a0 );
				scene.fog = new...