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MeshPhongMaterial

Video Lecture

MeshPhongMaterial

Description

In this lecture we experiment with the Three.js MeshPhongMaterial.

It uses the Blinn–Phong reflection model,

It is useful for simulating shiny objects such as polished wood.

It is more computationally-expensive to use than the MeshLambertMaterial, MeshNormalMaterial and MeshBasicMaterial so if performance needs to be considered, then one option you have is to only use it when necessary.

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Start Script

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
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 light = new THREE.PointLight(0xffffff, 1000)
light.position.set(10, 10, 10)
scene.add(light)

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.z = 3

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

new OrbitControls(camera, renderer.domElement)

const boxGeometry = new THREE.BoxGeometry()
const sphereGeometry = new THREE.SphereGeometry()
const icosahedronGeometry = new THREE.IcosahedronGeometry(1, 0)
const planeGeometry = new THREE.PlaneGeometry()
const torusKnotGeometry = new THREE.TorusKnotGeometry()

const material = new THREE.MeshPhongMaterial()

// const texture = new THREE.TextureLoader().load("img/grid.png")
// material.map = texture
// 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"])
// //envTexture.mapping = THREE.CubeReflectionMapping
// envTexture.mapping = THREE.CubeRefractionMapping
// material.envMap = envTexture

const cube = new THREE.Mesh(boxGeometry, material)
cube.position.x = 5
scene.add(cube)

const sphere = new THREE.Mesh(sphereGeometry, material)
sphere.position.x = 3
scene.add(sphere)

const icosahedron = new THREE.Mesh(icosahedronGeometry, material)
icosahedron.position.x = 0
scene.add(icosahedron)

const plane = new THREE.Mesh(planeGeometry, material)
plane.position.x = -2
scene.add(plane)

const torusKnot = new THREE.Mesh(torusKnotGeometry, material)
torusKnot.position.x = -5
scene.add(torusKnot)

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

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

const options = {
    side: {
        FrontSide: THREE.FrontSide,
        BackSide: THREE.BackSide,
        DoubleSide: THREE.DoubleSide,
    },
    combine: {
        MultiplyOperation: THREE.MultiplyOperation,
        MixOperation: THREE.MixOperation,
        AddOperation: THREE.AddOperation,
    },
}

const gui = new GUI()
const materialFolder = gui.addFolder('THREE.Material')
materialFolder
    .add(material, 'transparent')
    .onChange(() => (material.needsUpdate = true))
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(),
    //specular: material.specular.getHex()
}

const meshPhongMaterialFolder = gui.addFolder('THREE.MeshPhongMaterial')
meshPhongMaterialFolder.addColor(data, 'color').onChange(() => {
    material.color.setHex(Number(data.color.toString().replace('#', '0x')))
})
meshPhongMaterialFolder.addColor(data, 'emissive').onChange(() => {
    material.emissive.setHex(
        Number(data.emissive.toString().replace('#', '0x'))
    )
})
//meshPhongMaterialFolder.addColor(data, 'specular').onChange(() => { material.specular.setHex(Number(data.specular.toString().replace('#', '0x'))) });
//meshPhongMaterialFolder.add(material, 'shininess', 0, 1024);
meshPhongMaterialFolder.add(material, 'wireframe')
meshPhongMaterialFolder.add(material, 'wireframeLinewidth', 0, 10)
meshPhongMaterialFolder
    .add(material, 'flatShading')
    .onChange(() => updateMaterial())
meshPhongMaterialFolder
    .add(material, 'combine', options.combine)
    .onChange(() => updateMaterial())
meshPhongMaterialFolder.add(material, 'reflectivity', 0, 1)
meshPhongMaterialFolder.add(material, 'refractionRatio', 0, 1)
meshPhongMaterialFolder.open()

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

function animate() {
    requestAnimationFrame(animate)

    render()

    stats.update()
}

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

animate()

Final Script

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
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 light = new THREE.PointLight(0xffffff, 1000)
light.position.set(10, 10, 10)
scene.add(light)

const light2 = new THREE.PointLight(0xffffff, 1000)
light2.position.set(-10, -10, -10)
scene.add(light2)

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.z = 3

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

new OrbitControls(camera, renderer.domElement)

const boxGeometry = new THREE.BoxGeometry()
const sphereGeometry = new THREE.SphereGeometry()
const icosahedronGeometry = new THREE.IcosahedronGeometry(1, 0)
const planeGeometry = new THREE.PlaneGeometry()
const torusKnotGeometry = new THREE.TorusKnotGeometry()

const material = new THREE.MeshPhongMaterial()

const texture = new THREE.TextureLoader().load('img/grid.png')
material.map = texture
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',
])
envTexture.mapping = THREE.CubeReflectionMapping
// envTexture.mapping = THREE.CubeRefractionMapping
material.envMap = envTexture

const cube = new THREE.Mesh(boxGeometry, material)
cube.position.x = 5
scene.add(cube)

const sphere = new THREE.Mesh(sphereGeometry, material)
sphere.position.x = 3
scene.add(sphere)

const icosahedron = new THREE.Mesh(icosahedronGeometry, material)
icosahedron.position.x = 0
scene.add(icosahedron)

const plane = new THREE.Mesh(planeGeometry, material)
plane.position.x = -2
scene.add(plane)

const torusKnot = new THREE.Mesh(torusKnotGeometry, material)
torusKnot.position.x = -5
scene.add(torusKnot)

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

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

const options = {
    side: {
        FrontSide: THREE.FrontSide,
        BackSide: THREE.BackSide,
        DoubleSide: THREE.DoubleSide,
    },
    combine: {
        MultiplyOperation: THREE.MultiplyOperation,
        MixOperation: THREE.MixOperation,
        AddOperation: THREE.AddOperation,
    },
}

const gui = new GUI()
const materialFolder = gui.addFolder('THREE.Material')
materialFolder
    .add(material, 'transparent')
    .onChange(() => (material.needsUpdate = true))
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(),
    specular: material.specular.getHex(),
}

const meshPhongMaterialFolder = gui.addFolder('THREE.MeshPhongMaterial')
meshPhongMaterialFolder.addColor(data, 'color').onChange(() => {
    material.color.setHex(Number(data.color.toString().replace('#', '0x')))
})
meshPhongMaterialFolder.addColor(data, 'emissive').onChange(() => {
    material.emissive.setHex(
        Number(data.emissive.toString().replace('#', '0x'))
    )
})
meshPhongMaterialFolder.addColor(data, 'specular').onChange(() => {
    material.specular.setHex(
        Number(data.specular.toString().replace('#', '0x'))
    )
})
meshPhongMaterialFolder.add(material, 'shininess', 0, 1024)
meshPhongMaterialFolder.add(material, 'wireframe')
meshPhongMaterialFolder.add(material, 'wireframeLinewidth', 0, 10)
meshPhongMaterialFolder
    .add(material, 'flatShading')
    .onChange(() => updateMaterial())
meshPhongMaterialFolder
    .add(material, 'combine', options.combine)
    .onChange(() => updateMaterial())
meshPhongMaterialFolder.add(material, 'reflectivity', 0, 1)
meshPhongMaterialFolder.add(material, 'refractionRatio', 0, 1)
meshPhongMaterialFolder.open()

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

function animate() {
    requestAnimationFrame(animate)

    render()

    stats.update()
}

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

animate()

Blinn Phong Reflection Model

MeshPhongMaterial

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