MeshPhongMaterial

Video Lecture

MeshPhongMaterial MeshPhongMaterial 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 need to be considered, then one option you have is to only use it when necessary.

Start Code

./src/client/client.ts

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

const scene: THREE.Scene = new THREE.Scene()
//scene.background = new THREE.Color(0xff0000)

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

const light = new THREE.PointLight(0xffffff, 2);
light.position.set(10, 10, 10);
scene.add(light);

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

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

const controls = new OrbitControls(camera, renderer.domElement)
//controls.addEventListener('change', render)

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

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

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

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

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

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

camera.position.z = 3

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

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

var 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')
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()

var data = {
    color: material.color.getHex(),
    emissive: material.emissive.getHex(),
    //specular: material.specular.getHex()
};

var 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)
    material.combine = Number(material.combine)
    material.needsUpdate = true
}

var animate = function () {
    requestAnimationFrame(animate)

    render()

    stats.update()
};

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

Final Code

./src/client/client.ts

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

const scene: THREE.Scene = new THREE.Scene()
//scene.background = new THREE.Color(0xff0000)

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

const light = new THREE.PointLight(0xffffff, 2);
light.position.set(10, 10, 10);
scene.add(light);

const light2 = new THREE.PointLight(0xffffff, 2);
light2.position.set(-10, -10, -10);
scene.add(light2);



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

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

const controls = new OrbitControls(camera, renderer.domElement)
//controls.addEventListener('change', render)

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

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

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

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

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

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

camera.position.z = 3

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

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

var 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')
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()

var data = {
    color: material.color.getHex(),
    emissive: material.emissive.getHex(),
    specular: material.specular.getHex()
};

var 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)
    material.combine = Number(material.combine)
    material.needsUpdate = true
}

var animate = function () {
    requestAnimationFrame(animate)

    render()

    stats.update()
};

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

Blinn Phong Reflection Model