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HTML 

              
                <main>
  <section id="hero"></section>
  <section id="introduction"></section>
  <section id="right"></section>
  <section id="boot"></section>
  <section id="boot-2"></section>
  <section id="sadmac"></section>
  <section id="ram-intro"></section>
  <section id="ram"></section>
</main>
<div class="webgl"></div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,600;1,600&display=swap');

html,
body {
  --col1: #000000; 
  --col2: #ffffff;
  
  padding: 0;
  margin: 0;
  background: var(--col2);
  color: var(--col1);
}

main {
  counter-reset: section -1;
  
  section {
    height: 100svh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 28vh;
    counter-increment: section;
    border-bottom: 1px solid;
    
    &::before {
      font-family: 'EB Garamond', serif;
      font-weight: 600;
      letter-spacing: -0.045em;
      content: "Section "counter(section);
    }

    &#hero,
    &#introduction {
      background: #ede8e8;
    }
  }
}

.webgl {
  padding: 0;
  position: fixed;
  left: 0;
  top: calc((100dvh - 100svh) / 2);
  height: 100svh;
  z-index: 2;
  pointer-events: none;
  line-height: 0;
}
!

JS 

              
                import * as THREE from "https://esm.sh/three@0.160.0";
import { GLTFLoader } from 'https://esm.sh/three@0.160.0/examples/jsm/loaders/GLTFLoader.js'
import { DRACOLoader } from 'https://esm.sh/three@0.160.0/examples/jsm/loaders/DRACOLoader.js'

import gsap from "https://esm.sh/gsap@3.12.4";
import { ScrollTrigger } from 'https://esm.sh/gsap@3.12.4/ScrollTrigger'

class Scene {
  constructor(model) {
    this.views = [
      { bottom: 0, height: 1 }, //standard
      { bottom: 0, height: 0 } //wireframe
    ]
    
    this.renderer = new THREE.WebGLRenderer({
      powerPreference: 'high-performance',
      antialias: true,
      alpha: true
    })
   
    this.deviceRatio = Math.min(window.devicePixelRatio, 1.5)
    
    this.renderer.useLegacyLights = true
    this.renderer.setSize(window.innerWidth, window.innerHeight)
    this.renderer.shadowMap.enabled = true
    this.renderer.shadowMap.type = THREE.PCFSoftShadowMap
    this.renderer.setPixelRatio(this.deviceRatio)
    this.renderer.outputColorSpace = THREE.LinearSRGBColorSpace
    
    document.querySelector('.webgl').appendChild(this.renderer.domElement)
    
    //scene
    this.scene = new THREE.Scene()
    this.views.forEach((view, i) => {
      let camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 2000)
      camera.position.fromArray([0, 0, 180])
      camera.layers.disableAll()
      camera.layers.enable(i)
      view.camera = camera
      camera.lookAt(new THREE.Vector3(0, 5, 0))
      
    })
    
    //lights
    this.light = new THREE.PointLight(0xffffff, 0.75)
    this.light.position.z = 200
    this.light.position.x = 0
    this.light.position.y = 100
    this.light.castShadow = true
    this.scene.add(this.light)

    this.softLight = new THREE.AmbientLight(0xffffff, 0.5)
    this.scene.add(this.softLight)
  
    this.spotLight = new THREE.SpotLight(0xffffff, 0)
    this.spotLight.position.set(200, 0, 100)
    this.scene.add(this.spotLight)

    this.onResize()
    window.addEventListener('resize', this.onResize, false)
    this.modelGroup = new THREE.Group()
    
    //wireframe
    const analog = model.getObjectByName('analog_body')
    
    let wireframe = analog.clone()
    wireframe.name = 'wireframe'
    wireframe.children = []
    
    analog.traverse((mesh) => {
      if(mesh.isMesh) {
        let edges = new THREE.EdgesGeometry(mesh.geometry)
        let line = new THREE.LineSegments(edges)
        line.material.depthTest = false
        line.material.opacity = 1
        line.material.lineWidth = 1
        line.material.color = new THREE.Color(0x000000)
        line.material.transparent = true
        line.layers.set(1)
        wireframe.add(line)
      }
    })
    
    model.name = 'model'
    const mac = new THREE.Group()
    mac.name = 'mac'
    mac.add(model)
    mac.add(wireframe)
    this.modelGroup.add(mac)
    this.scene.add(this.modelGroup)
  }
  
  render = () => {
    this.views.forEach((view) => {
      let camera = view.camera
      let bottom = Math.floor(this.h * view.bottom)
      let height = Math.floor(this.h * view.height)
      
      this.renderer.setViewport(0, 0, this.w, this.h)
      this.renderer.setScissor(0, bottom, this.w, height)
      this.renderer.setScissorTest(true)
      camera.aspect = this.w / this.h
      this.renderer.render(this.scene, camera)
    })
  }
  
  onResize = () => {
    let height = document.querySelector('.webgl').offsetHeight
    this.w = window.innerWidth
    this.h = height > 200 ? height : window.innerHeight 
    
    this.views.forEach((view) => {
      let camera = view.camera
      camera.aspect = this.w / this.h
      let camZ = (screen.width - (this.w * 1)) / 3
      camera.position.z = height > 1024 ? 180 + (height / 65) : 180
      camera.updateProjectionMatrix()
    })

    this.renderer.setSize(this.w, this.h)
    this.render()
  }
}

let loadModel = () => {
  let model
  let manager = new THREE.LoadingManager(() => { initScene(model) })
  
  let gltfLoader = new GLTFLoader(manager)
  const dracoLoader = new DRACOLoader()
  //directory three/examples/js/libs/draco/gltf/*
  dracoLoader.setDecoderPath('https://giorgi.io/codepen/draco/')
  gltfLoader.setDRACOLoader(dracoLoader)
  
  gltfLoader.load(
    'https://giorgi.io/codepen/mac_codepen.glb',
    (obj) => { model = obj.scene }
  )
}

let initScene = (model) => {
  let scene = new Scene(model)
  let all = scene.modelGroup
  let mac = all.getObjectByName('mac')
  
  let crt = mac.getObjectByName('crt')
  let logic = mac.getObjectByName('logic')
  let floppy = mac.getObjectByName('floppy')
  let analog = mac.getObjectByName('analog')
  let support = mac.getObjectByName('support')
  
  let camera = scene.views[0].camera

  gsap.registerPlugin(ScrollTrigger)
  ScrollTrigger.config({ ignoreMobileResize: true })
  
  let sectionTimeline = (section, callback, options={}, defaults={}, custom=()=>{}) => {
    let tl = new gsap.timeline({
      ...{
        onUpdate: scene.render,
        scrollTrigger: {
          ...{ 
            trigger: '#' + section,
            scrub: true,
            start: 'clamp(top bottom)',
            end: 'clamp(top top)',
          },
          ...options
        },
        defaults: {
          ...{
            duration: 1,
            ease: 'power2.inOut'
          },
          ...defaults
        }
      },
      ...custom
    })
    callback(tl)
  }
  
  //1 Introduction
  sectionTimeline('introduction', (tl) => {
    tl.fromTo(mac.position, { x: 67, y: -47, z: 100 }, {x: -40, y:-47, z: 50, ease: 'power1.out'}, 0)
    tl.fromTo(mac.rotation, {y: -1.22}, {y: -6.6, ease: 'power1.out'}, 0)
  })
  
  //2 Right
  sectionTimeline('right', (tl) => {
    tl.fromTo(mac.position, {x: -40, z: 50}, {x: 80, z: 10, ease: 'power1.Out'}, 0)
    tl.fromTo(mac.rotation, {y: -6.6}, {y: -0.5, ease: 'power1.Out'}, 0)
  })
  
  //3 Boot
  sectionTimeline('boot', (tl) => {
    tl.fromTo(mac.position, {x: 80}, {x: 0, ease: 'power1.Out'}, 0)
    tl.fromTo(mac.rotation, {y: -0.5}, {y: 0, ease: 'power1.Out'}, 0)
  })
  
  //4 Boot 2
  sectionTimeline('boot-2', (tl) => {
    tl.fromTo(scene.light, { intensity: 0.75 }, { intensity: 0.5, ease: 'power1.Out'}, 0)
    tl.fromTo(scene.softLight, { intensity: 0.5 }, { intensity: 0, ease: 'power1.Out'}, 0)
    tl.fromTo('body', {'--col1': '#000000', '--col2': '#ffffff'}, {'--col1': '#ffffff', '--col2': '#000', duration: 1}, 0)
  }, {
    scrub: false,
    toggleActions: 'play play reverse reverse',
    start: 'top top'
  })
  
  //5 Sad Mac
  sectionTimeline('sadmac', (tl) => {
    tl.fromTo(mac.position, {x: 0}, {x: -80, ease: 'power1.Out'}, 0)
    tl.fromTo(mac.rotation, {y: 0}, {y: 0.5, ease: 'power1.Out'}, 0)
  })
  
  //6 Ram
  sectionTimeline('ram-intro', (tl) => {
    tl.fromTo(mac.position, {x: -80, y:-47 }, {x: 80, y: 15 }, 'start')
    tl.fromTo(mac.rotation, {y: 0.5 }, {y: -1.35, duration: 0.6 }, 'start')
    tl.fromTo(scene.spotLight, { intensity: 0 }, { intensity: 0.8 }, 'start')
    
    tl.fromTo(crt.position, {z: 0 }, {z: 240, ease: 'power2.In' }, 'start+=20%')
    tl.fromTo(support.position, {z: 0 }, {z: 180, ease: 'power2.In' }, 'start+=20%')
    tl.fromTo(floppy.position, {z: 0 }, {z: 180, ease: 'power2.In' }, 'start+=20%')
    tl.fromTo(analog.position, {z: 0 }, {z: -150, ease: 'power2.In' }, 'start+=20%')
    tl.fromTo(logic.position, {z: 0 }, {z: -20 }, 'start+=20%')
    
    tl.fromTo(mac.rotation, {x: 0}, {x: 1.2 }, 'start')
    tl.fromTo(mac.scale, {x: 1, y: 1, z: 1}, {x: 1.65, y: 1.65, z: 1.65, duration: 0.7}, 'start+=30%')
  },{
    end: '200% top',
  },{
    ease: 'power1.InOut'
  })
  
  //toggle wireframe
  gsap.fromTo(scene.views[1], { height: 1, bottom: 0 }, {
    height: 0,
    bottom: 1,
    ease: 'none',
    onUpdate: scene.render,
    scrollTrigger: {
      trigger: '#right',
      scrub: true,
      start: 'top bottom',
      end: 'top top'
    }
  })
  
  //set first frame defaults
  gsap.set(scene.views[1], { height: 1, bottom: 0 })
  gsap.set(mac.position, { x: 67, y: -47, z: 100 })
  gsap.set(mac.rotation, { y: -1.22, x: 0 })
  gsap.set(mac.scale, {x: 1, y: 1, z: 1})
  scene.render()
}

document.addEventListener('DOMContentLoaded', () => { loadModel() })
!
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