I have stacked the sticky areas – but how to add the text in the same style/manner. Also I’ve created refs for each of the phone scenes – but its no longer sticking – and I am unsure what causes it to stick in the first place to control how long the user sees each part?

This renders multiple phones – but the sticky aspect has got lost

https://codesandbox.io/p/sandbox/r3f-scroll-rig-sticky-box-forked-3zpm73

import React, { useRef, useEffect } from 'react'
import { Canvas, useThree } from '@react-three/fiber'
import { useGLTF, OrbitControls } from '@react-three/drei'
import gsap from 'gsap'
import { ScrollTrigger } from 'gsap/ScrollTrigger'
import * as THREE from 'three'

gsap.registerPlugin(ScrollTrigger)

const IphoneModel = (ref) => {
  const group = useRef()
  const { nodes, materials } = useGLTF('/Iphone15.glb')

  useEffect(() => {
    const video = document.createElement('video')
    video.src = 'https://cdn.pixabay.com/video/2024/07/14/221180_tiny.mp4'
    video.crossOrigin = 'anonymous'
    video.loop = true
    video.muted = true
    video.play()

    const videoTexture = new THREE.VideoTexture(video)
    videoTexture.minFilter = THREE.LinearFilter
    videoTexture.magFilter = THREE.LinearFilter
    videoTexture.encoding = THREE.sRGBEncoding

    materials.Screen.map = videoTexture
    materials.Screen.needsUpdate = true

    const tl = gsap.timeline({
      scrollTrigger: {
        trigger: ref[0],
        scrub: 1,
        markers: true,
        pin: true,
        start: 'top top',
        end: 'bottom top'
      }
    })

    tl.to(group.current.rotation, { z: -Math.PI / 8, duration: 2 })
  }, [materials.Screen])

  return (
    <group ref={group} dispose={null} scale={0.2} rotation={[Math.PI / 2, 0, Math.PI / 8]}>
      <mesh geometry={nodes.M_Cameras.geometry} material={materials.cam} />
      <mesh geometry={nodes.M_Glass.geometry} material={materials['glass.001']} />
      <mesh geometry={nodes.M_Metal_Rough.geometry} material={materials.metal_rough} />
      <mesh geometry={nodes.M_Metal_Shiny.geometry} material={materials.metal_Shiny} />
      <mesh geometry={nodes.M_Plastic.geometry} material={materials.metal_rough} />
      <mesh geometry={nodes.M_Portal.geometry} material={materials['M_Base.001']} />
      <mesh geometry={nodes.M_Screen.geometry} material={materials.Screen} />
      <mesh geometry={nodes.M_Speakers.geometry} material={materials.metal_rough} />
      <mesh geometry={nodes.M_USB.geometry} material={materials.metal_rough} />
    </group>
  )
}

const Background = () => {
  const { scene } = useThree()
  useEffect(() => {
    scene.background = new THREE.Color('#555555')
  }, [scene])

  return null
}

const TextSection = () => {
  const textRefs = useRef([])

  useEffect(() => {
    gsap.fromTo(
      textRefs.current,
      { opacity: 0 },
      {
        opacity: 1,
        stagger: 0.1,
        scrollTrigger: {
          trigger: '#text-trigger',
          start: 'top bottom',
          end: 'center center',
          scrub: 1,
          markers: false
        }
      }
    )
  }, [])

  const texts = ['Ready 5', 'Ready 4', 'Ready 3', 'Ready 2', 'Ready 1']

  return (
    <div
      id="text-trigger"
      style={{
        height: '100vh',
        display: 'flex',
        flexDirection: 'column',
        alignItems: 'center',
        justifyContent: 'center',
        position: 'relative',
        top: '500px'
      }}>
      {texts.map((text, index) => (
        <h1 key={index} ref={(el) => (textRefs.current[index] = el)} style={{ opacity: 0 }}>
          {text}
        </h1>
      ))}
    </div>
  )
}

const ThreeScene = () => {
  const threeSceneGroup = useRef()

  return (
    <div id="three-canvas-container" style={{ width: '100vw', height: '500px' }}>
      <div>
        <h2>header text</h2>
        <p>text text text</p>
      </div>
      <Canvas camera={{ position: [0, 0, 10], fov: 45 }} gl={{ antialias: true, alpha: false }}>
        <ambientLight intensity={0.4} />
        <directionalLight position={[5, 10, 7.5]} intensity={1} />
        <IphoneModel ref={threeSceneGroup} />
        <OrbitControls enableZoom={false} />
        <Background />
      </Canvas>
    </div>
  )
}

const App = () => (
  <div style={{ display: 'flex', flexDirection: 'column', height: '400vh' }}>
    <div className="some-content" style={{ height: '100vh', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
      <h1>ACTION</h1>
    </div>
    <ThreeScene />
    <ThreeScene />
    <ThreeScene />
    <ThreeScene />
    <ThreeScene />

    <TextSection />
  </div>
)

export default App

This renders just one phone but actually has working sticky features.

https://codesandbox.io/p/sandbox/r3f-scroll-rig-sticky-box-forked-jns24q

app.js

import React, { useRef, useEffect } from 'react'
import { Canvas, useThree } from '@react-three/fiber'
import { useGLTF, OrbitControls } from '@react-three/drei'
import gsap from 'gsap'
import { ScrollTrigger } from 'gsap/ScrollTrigger'
import * as THREE from 'three'

gsap.registerPlugin(ScrollTrigger)

const IphoneModel = () => {
  const group = useRef()
  const { nodes, materials } = useGLTF('/Iphone15.glb')

  useEffect(() => {
    const video = document.createElement('video')
    video.src = 'https://cdn.pixabay.com/video/2024/07/14/221180_tiny.mp4'
    video.crossOrigin = 'anonymous'
    video.loop = true
    video.muted = true
    video.play()

    const videoTexture = new THREE.VideoTexture(video)
    videoTexture.minFilter = THREE.LinearFilter
    videoTexture.magFilter = THREE.LinearFilter
    videoTexture.encoding = THREE.sRGBEncoding

    materials.Screen.map = videoTexture
    materials.Screen.needsUpdate = true

    const tl = gsap.timeline({
      scrollTrigger: {
        trigger: '#three-canvas-container',
        scrub: 1,
        markers: true,
        pin: true,
        start: 'top top',
        end: 'bottom top'
      }
    })

    tl.to(group.current.rotation, { z: Math.PI * 2, duration: 2 })
  }, [materials.Screen])

  return (
    <group ref={group} dispose={null} scale={0.2} rotation={[Math.PI / 2, 0, -Math.PI / 8]}>
      <mesh geometry={nodes.M_Cameras.geometry} material={materials.cam} />
      <mesh geometry={nodes.M_Glass.geometry} material={materials['glass.001']} />
      <mesh geometry={nodes.M_Metal_Rough.geometry} material={materials.metal_rough} />
      <mesh geometry={nodes.M_Metal_Shiny.geometry} material={materials.metal_Shiny} />
      <mesh geometry={nodes.M_Plastic.geometry} material={materials.metal_rough} />
      <mesh geometry={nodes.M_Portal.geometry} material={materials['M_Base.001']} />
      <mesh geometry={nodes.M_Screen.geometry} material={materials.Screen} />
      <mesh geometry={nodes.M_Speakers.geometry} material={materials.metal_rough} />
      <mesh geometry={nodes.M_USB.geometry} material={materials.metal_rough} />
    </group>
  )
}

const Background = () => {
  const { scene } = useThree()
  useEffect(() => {
    scene.background = new THREE.Color('#555555')
  }, [scene])

  return null
}

const TextSection = () => {
  const textRefs = useRef([])

  useEffect(() => {
    gsap.fromTo(
      textRefs.current,
      { opacity: 0 },
      {
        opacity: 1,
        stagger: 0.1,
        scrollTrigger: {
          trigger: '#text-trigger',
          start: 'top bottom',
          end: 'center center',
          scrub: 1,
          markers: false
        }
      }
    )
  }, [])

  const texts = ['Ready 5', 'Ready 4', 'Ready 3', 'Ready 2', 'Ready 1']

  return (
    <div
      id="text-trigger"
      style={{
        height: '100vh',
        display: 'flex',
        flexDirection: 'column',
        alignItems: 'center',
        justifyContent: 'center',
        position: 'relative',
        top: '500px'
      }}>
      {texts.map((text, index) => (
        <h1 key={index} ref={(el) => (textRefs.current[index] = el)} style={{ opacity: 0 }}>
          {text}
        </h1>
      ))}
    </div>
  )
}

const ThreeScene = () => (
  <div id="three-canvas-container" style={{ width: '100vw', height: '500px' }}>
    <Canvas camera={{ position: [0, 0, 10], fov: 45 }} gl={{ antialias: true, alpha: false }}>
      <ambientLight intensity={0.4} />
      <directionalLight position={[5, 10, 7.5]} intensity={1} />
      <IphoneModel />
      <OrbitControls enableZoom={false} />
      <Background />
    </Canvas>
  </div>
)

const App = () => (
  <div style={{ display: 'flex', flexDirection: 'column', height: '400vh' }}>
    <div className="some-content" style={{ height: '100vh', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
      <h1>ACTION</h1>
    </div>
    <ThreeScene />
    <TextSection />
  </div>
)

export default App

I was having issues trying to get the image the right way up — and found this vector2 function did the trick

const imageTexture = new THREE.TextureLoader().load(image)
    
imageTexture.wrapS = imageTexture.wrapT = THREE.RepeatWrapping
imageTexture.anisotropy = 16

imageTexture.repeat = new THREE.Vector2(1, -1)

https://codesandbox.io/p/sandbox/r3f-scroll-rig-sticky-box-forked-xwt2x6