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Glass Transmission

The THREE.MeshPhysicalMaterial simulates glass very well.

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This example demonstrates overriding a material that was set in an exported glTF, with a customised THREE.MeshPhysicalMaterial.

Code

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader'
import Stats from 'three/examples/jsm/libs/stats.module'
import { GUI } from 'dat.gui'

const scene = new THREE.Scene()
scene.add(new THREE.AxesHelper(5))

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.set(-0.6, 0.45, 2)

const renderer = new THREE.WebGLRenderer()
//renderer.physicallyCorrectLights = true //deprecated
renderer.useLegacyLights = false //use this instead of setting physicallyCorrectLights=true property
renderer.shadowMap.enabled = true
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

const controls = new OrbitControls(camera, renderer.domElement)
controls.enableDamping = true

const material = new THREE.MeshPhysicalMaterial({})
material.thickness = 3.0
material.roughness = 0.9
material.clearcoat = 0.1
material.clearcoatRoughness = 0
material.transmission = 0.99
material.ior = 1.25
material.envMapIntensity = 25

const texture = new THREE.TextureLoader().load('img/grid.png')
material.map = texture
const pmremGenerator = new THREE.PMREMGenerator(renderer)
const envTexture = new THREE.CubeTextureLoader().load(
    [
        'img/px_50.png',
        'img/nx_50.png',
        'img/py_50.png',
        'img/ny_50.png',
        'img/pz_50.png',
        'img/nz_50.png',
    ],
    () => {
        material.envMap = pmremGenerator.fromCubemap(envTexture).texture
        pmremGenerator.dispose()
    }
)

let monkeyMesh: THREE.Mesh

const loader = new GLTFLoader()
loader.load(
    'models/monkey.glb',
    function (gltf) {
        gltf.scene.traverse(function (child) {
            if ((child as THREE.Mesh).isMesh) {
                const m = child as THREE.Mesh
                if (m.name === 'Suzanne') {
                    m.material = material
                    monkeyMesh = m
                }
                m.receiveShadow = true
                m.castShadow = true
            }
            if ((child as THREE.Light).isLight) {
                const l = child as THREE.SpotLight
                l.castShadow = true
                l.shadow.bias = -0.001
                l.shadow.mapSize.width = 2048
                l.shadow.mapSize.height = 2048
            }
        })
        scene.add(gltf.scene)
    },
    (xhr) => {
        console.log((xhr.loaded / xhr.total) * 100 + '% loaded')
    },
    (error) => {
        console.log(error)
    }
)

window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight
    camera.updateProjectionMatrix()
    renderer.setSize(window.innerWidth, window.innerHeight)
    render()
}

const options = {
    side: {
        FrontSide: THREE.FrontSide,
        BackSide: THREE.BackSide,
        DoubleSide: THREE.DoubleSide,
    },
}
const gui = new GUI()
const materialFolder = gui.addFolder('THREE.Material')
materialFolder.add(material, 'transparent')
materialFolder.add(material, 'opacity', 0, 1, 0.01)
materialFolder.add(material, 'depthTest')
materialFolder.add(material, 'depthWrite')
materialFolder
    .add(material, 'alphaTest', 0, 1, 0.01)
    .onChange(() => updateMaterial())
materialFolder.add(material, 'visible')
materialFolder
    .add(material, 'side', options.side)
    .onChange(() => updateMaterial())
//materialFolder.open()

const data = {
    color: material.color.getHex(),
    emissive: material.emissive.getHex(),
}

const meshPhysicalMaterialFolder = gui.addFolder('THREE.MeshPhysicalMaterial')

meshPhysicalMaterialFolder.addColor(data, 'color').onChange(() => {
    material.color.setHex(Number(data.color.toString().replace('#', '0x')))
})
meshPhysicalMaterialFolder.addColor(data, 'emissive').onChange(() => {
    material.emissive.setHex(
        Number(data.emissive.toString().replace('#', '0x'))
    )
})

meshPhysicalMaterialFolder.add(material, 'wireframe')
meshPhysicalMaterialFolder
    .add(material, 'flatShading')
    .onChange(() => updateMaterial())
meshPhysicalMaterialFolder.add(material, 'roughness', 0, 1)
meshPhysicalMaterialFolder.add(material, 'metalness', 0, 1)
meshPhysicalMaterialFolder.add(material, 'clearcoat', 0, 1, 0.01)
meshPhysicalMaterialFolder.add(material, 'clearcoatRoughness', 0, 1, 0.01)
meshPhysicalMaterialFolder.add(material, 'transmission', 0, 1, 0.01)
meshPhysicalMaterialFolder.add(material, 'ior', 1.0, 2.333)
meshPhysicalMaterialFolder.add(material, 'thickness', 0, 10.0)
meshPhysicalMaterialFolder.open()

function updateMaterial() {
    material.side = Number(material.side) as THREE.Side
    material.needsUpdate = true
}

const stats = new Stats()
document.body.appendChild(stats.dom)

function animate() {
    requestAnimationFrame(animate)

    controls.update()

    monkeyMesh.rotation.y += 0.01

    render()

    stats.update()
}

function render() {
    renderer.render(scene, camera)
}

animate()

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