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HTML

              
                <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    
    <!-- Imporant meta information to make the page as rigid as possible on mobiles, to avoid unintentional zooming on the page itself  -->
    <meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Chair Tutorial</title>
    <link href="https://fonts.googleapis.com/css?family=Raleway:500,700&display=swap" rel="stylesheet">
</head>

<canvas id="c"></canvas>

<!-- The main three.js file -->
<script src='https://cdnjs.cloudflare.com/ajax/libs/three.js/108/three.min.js'></script>

<!-- This brings in the ability to load custom 3D objects in the .gltf file format. Blender allows the ability to export to this format out the box -->
<script src='https://cdn.jsdelivr.net/gh/mrdoob/three.js@r92/examples/js/loaders/GLTFLoader.js'></script>

<!-- This is a simple to use extension for three.js that activates all the rotating, dragging and zooming controls we need for both mouse and touch, there isn't a clear CDN for this that I can find -->
<script src='https://threejs.org/examples/js/controls/OrbitControls.js'></script>

</body>
</html>
              
            
!

CSS

              
                body,
html {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: 'Raleway', sans-serif;
  font-size: 14px;
  color: #444444;
}
* {
  touch-action: manipulation;
}
*,
*:before,
*:after {
  box-sizing: border-box;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  overflow: hidden;
}

 #c {
  width: 100%;
  height: 100%;
  display: block;
  top: 0;
  left: 0;
}


.controls {
  position: absolute;
  bottom: 0;
  width: 100%;
}
.options {
  position: absolute;
  left: 0;
}
.option {
  background-size: cover;
  background-position: 50%;
  background-color: white;
  margin-bottom: 3px;
  padding: 10px;
  height: 55px;
  width: 55px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}
.option:hover {
  border-left: 5px solid white;
  width: 58px;
}
.option.--is-active {
  border-right: 3px solid red;
  width: 58px;
  cursor: default;
}
.option.--is-active:hover {
  border-left: none;
}
.option img {
  height: 100%;
  width: auto;
  pointer-events: none;
}
.info {
  padding: 0 1em;
  display: flex;
  justify-content: flex-end;
}
.info p {
  margin-top: 0;
}
.tray {
  width: 100%;
  height: 50px;
  position: relative;
  overflow-x: hidden;
}
.tray__slide {
  position: absolute;
  display: flex;
  left: 0;
  transform: translateX(-50%);
  animation: wheelin 1s 2s ease-in-out forwards;
}
.tray__swatch {
  transition: 0.1s ease-in;
  height: 50px;
  min-width: 50px;
  flex: 1;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.3);
  background-size: cover;
  background-position: center;
}
.tray__swatch:nth-child(5n+5) {
  margin-right: 20px;
}
.drag-notice {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2em;
  width: 10em;
  height: 10em;
  box-sizing: border-box;
  font-size: 0.9em;
  font-weight: 800;
  text-transform: uppercase;
  text-align: center;
  border-radius: 5em;
  background: white;
  position: absolute;
}
.drag-notice.start {
  animation: popout 0.25s 3s forwards;
}
@keyframes popout {
  to {
    transform: scale(0);
  }
}
@keyframes wheelin {
  to {
    transform: translateX(0);
  }
}
@media (max-width: 960px) {
  .options {
    top: 0;
  }
  .info {
    padding: 0 1em 1em 0;
  }
  .info__message {
    display: flex;
    align-items: flex-end;
  }
  .info__message p {
    margin: 0;
    font-size: 0.7em;
  }
}
@media (max-width: 720px) {
  .info {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0 1em 1em;
  }
  .info__message {
    margin-bottom: 1em;
  }
}
@media (max-width: 680px) {
  .info {
    padding: 1em 2em;
  }
  .info__message {
    display: none;
  }
  .options {
    bottom: 50px;
  }
  .option {
    margin-bottom: 1px;
    padding: 5px;
    height: 45px;
    width: 45px;
    display: flex;
  }
  .option.--is-active {
    border-right: 2px solid red;
    width: 47px;
  }
  .option img {
    height: 100%;
    width: auto;
    pointer-events: none;
  }
}
              
            
!

JS

              
                var theModel;

const MODEL_PATH = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/1376484/chair.glb";

const BACKGROUND_COLOR = 0xf1f1f1;
// Init the scene
const scene = new THREE.Scene();
// Set background
scene.background = new THREE.Color(BACKGROUND_COLOR );
scene.fog = new THREE.Fog(BACKGROUND_COLOR, 20, 100);

const canvas = document.querySelector('#c');

// Init the renderer
const renderer = new THREE.WebGLRenderer({canvas, antialias: true});

renderer.shadowMap.enabled = true;
renderer.setPixelRatio(window.devicePixelRatio); 

var cameraFar = 5;

document.body.appendChild(renderer.domElement);

// Add a camerra
var camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.z = cameraFar;
camera.position.x = 0;

// Initial material
const INITIAL_MTL = new THREE.MeshPhongMaterial( { color: 0xf1f1f1, shininess: 10 } );

const INITIAL_MAP = [
  {childID: "back", mtl: INITIAL_MTL},
  {childID: "base", mtl: INITIAL_MTL},
  {childID: "cushions", mtl: INITIAL_MTL},
  {childID: "legs", mtl: INITIAL_MTL},
  {childID: "supports", mtl: INITIAL_MTL},
];

// Init the object loader
var loader = new THREE.GLTFLoader();

loader.load(MODEL_PATH, function(gltf) {
  theModel = gltf.scene;

    theModel.traverse((o) => {
     if (o.isMesh) {
       o.castShadow = true;
       o.receiveShadow = true;
     }
   });
  
// Set the models initial scale   
  theModel.scale.set(2,2,2);
  theModel.rotation.y = Math.PI;

  // Offset the y position a bit
  theModel.position.y = -1;

  // Set initial textures
  for (let object of INITIAL_MAP) {
    initColor(theModel, object.childID, object.mtl);
  }

  // Add the model to the scene
  scene.add(theModel);

}, undefined, function(error) {
  console.error(error)
});

// Function - Add the textures to the models
function initColor(parent, type, mtl) {
  parent.traverse((o) => {
   if (o.isMesh) {
     if (o.name.includes(type)) {
          o.material = mtl;
          o.nameID = type; // Set a new property to identify this object
       }
   }
 });
}

// Add lights
var hemiLight = new THREE.HemisphereLight( 0xffffff, 0xffffff, 0.61 );
    hemiLight.position.set( 0, 50, 0 );
// Add hemisphere light to scene   
scene.add( hemiLight );

var dirLight = new THREE.DirectionalLight( 0xffffff, 0.54 );
    dirLight.position.set( -8, 12, 8 );
    dirLight.castShadow = true;
    dirLight.shadow.mapSize = new THREE.Vector2(1024, 1024);
// Add directional Light to scene    
    scene.add( dirLight );

// Floor
var floorGeometry = new THREE.PlaneGeometry(5000, 5000, 1, 1);
var floorMaterial = new THREE.MeshPhongMaterial({
  color: 0xeeeeee,
  shininess: 0
});

var floor = new THREE.Mesh(floorGeometry, floorMaterial);
floor.rotation.x = -0.5 * Math.PI;
floor.receiveShadow = true;
floor.position.y = -1;
scene.add(floor);

function animate() {
  renderer.render(scene, camera);
  requestAnimationFrame(animate);
  
  if (resizeRendererToDisplaySize(renderer)) {
    const canvas = renderer.domElement;
    camera.aspect = canvas.clientWidth / canvas.clientHeight;
    camera.updateProjectionMatrix();
  }
}

animate();

// Function - New resizing method
function resizeRendererToDisplaySize(renderer) {
  const canvas = renderer.domElement;
  var width = window.innerWidth;
  var height = window.innerHeight;
  var canvasPixelWidth = canvas.width / window.devicePixelRatio;
  var canvasPixelHeight = canvas.height / window.devicePixelRatio;

  const needResize = canvasPixelWidth !== width || canvasPixelHeight !== height;
  if (needResize) {
    
    renderer.setSize(width, height, false);
  }
  return needResize;
}
              
            
!
999px

Console