JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/npm/three@0.123/build/three.js"></script>
<script src="https://cdn.jsdelivr.net/npm/three@0.123/examples/js/loaders/GLTFLoader.js"></script>
<script src="https://cdn.jsdelivr.net/npm/three@0.123/examples/js/controls/OrbitControls.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

let camera, scene, renderer, clock, mixer;

init();
animate();

function init() {

	camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.01, 10 );
	camera.position.set( 2, 2, - 2 );
	
	clock = new THREE.Clock();

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

	const light = new THREE.HemisphereLight( 0xbbbbff, 0x444422 );
	light.position.set( 0, 1, 0 );
	scene.add( light );

	// model
	const loader = new THREE.GLTFLoader();
	loader.load( 'https://threejs.org/examples/models/gltf/Soldier.glb', function ( gltf ) {

		const model = gltf.scene;
		
		mixer = new THREE.AnimationMixer( model );
		
		const idleClip = gltf.animations[ 0 ];
		const walkClip = gltf.animations[ 3 ];
		
		const idleAction = mixer.clipAction( idleClip );
		const walkAction = mixer.clipAction( walkClip );
		
		idleAction.play();
		
		setTimeout( function() {
		
			walkAction.play();
			idleAction.crossFadeTo( walkAction, 1 );
		
		}, 2000 );

		scene.add( model );

	} );

	renderer = new THREE.WebGLRenderer( { antialias: true } );
	renderer.setPixelRatio( window.devicePixelRatio );
	renderer.setSize( window.innerWidth, window.innerHeight );
	renderer.gammaOutput = true;
	renderer.gammaFactor = 2.2;
	document.body.appendChild( renderer.domElement );

	window.addEventListener( 'resize', onWindowResize, false );

	const controls = new THREE.OrbitControls( camera, renderer.domElement );
	controls.target.set( 0, 1, 0 );
	controls.update();

}

function onWindowResize() {

	camera.aspect = window.innerWidth / window.innerHeight;
	camera.updateProjectionMatrix();

	renderer.setSize( window.innerWidth, window.innerHeight );

}

function animate() {

	requestAnimationFrame( animate );
	
	if ( mixer ) {
	
		mixer.update( clock.getDelta() );
	
	}

	renderer.render( scene, camera );

}