Three.js - MeshDepthMaterial

It uses the distance from the camera to determine how to color your mesh in a greyscale. White is nearest, and black is farthest.

const geometry = new THREE.TorusKnotGeometry()
const material = new THREE.MeshDepthMaterial()
const torusKnot = new THREE.Mesh(geometry, material)

Example

You can understand better in this example.

mesh-depth.html

Live Demo

<!DOCTYPE html>
<html lang="en">
   <head>
      <meta charset="UTF-8" />
      <meta http-equiv="X-UA-Compatible" content="ie=edge" />
      <meta name="viewport" content="width=device-width, initial-scale=1.0" />
      <title>Three.js - MeshDepthMaterial </title>
      <style>
         * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -applesystem, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu,
               Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
         }
         html,
         body {
            height: 100vh;
            width: 100vw;
         }
         #threejs-container {
            position: block;
            width: 100%;
            height: 100%;
         }
      </style>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.7/dat.gui.js"></script>
   </head>
   <body>
      <div id="threejs-container"></div>
      <script type="module">
         // Using mesh depth material
         // white means, top point. black means, bottom point
         // GUI
         const gui = new dat.GUI()
         // sizes
         let width = window.innerWidth
         let height = window.innerHeight// scene
         const scene = new THREE.Scene()
         scene.background = new THREE.Color(0x262626)
         // Light
         const ambientLight = new THREE.AmbientLight(0xffffff, 1)
         scene.add(ambientLight)
         const pointLight = new THREE.PointLight(0xffffff, 0.5)
         pointLight.position.x = 2
         pointLight.position.y = 3
         pointLight.position.z = 4
         scene.add(pointLight)
         // camera
         const camera = new THREE.PerspectiveCamera(30, width / height, 250, 550)
         camera.position.z = 450
         // torusKnot
         const geometry = new THREE.TorusKnotGeometry(50, 20, 128, 64, 2, 3)
         const material = new THREE.MeshDepthMaterial()
         const materialFolder = gui.addFolder('Material')
         materialFolder.add(material, 'wireframe')
         materialFolder.open()
         const torusKnot = new THREE.Mesh(geometry, material)
         scene.add(torusKnot)
         // responsiveness
         window.addEventListener('resize', () => {
            width = window.innerWidth
            height = window.innerHlet
            camera.aspect = width / height
            camera.updateProjectionMatrix()
            renderer.setSize(window.innerWidth, window.innerHeight)
            renderer.render(scene, camera)
         })
         // renderer
         const renderer = new THREE.WebGL1Renderer({ logarithmicDepthBuffer: true })
         renderer.setSize(width, height)
         renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2))
         // animation
         function animate() {
            requestAnimationFrame(animate)
            torusKnot.rotation.x += 0.005
            torusKnot.rotation.y += 0.01
            renderer.render(scene, camera)
         }
         // rendering the scene
         const container = document.querySelector('#threejs-container')
         container.append(renderer.domElement)
         renderer.render(scene, camera)
         animate()
      </script>
   </body>
</html>

Output

threejs_materials.htm