MeshLambertMaterial

Video Lecture

MeshLambertMaterial MeshLambertMaterial MeshLambertMaterial

Description

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

Lambertian reflectance is the property that defines an ideal matte or diffusely reflecting surface.

Examples may be wood, or stone. Generally objects that aren't shiny, but are still affected by lighting.

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.MeshLambertMaterial = new THREE.MeshLambertMaterial()

// 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"])
// texture.mapping = THREE.CubeReflectionMapping
// // //texture.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(),
};

var meshLambertMaterialFolder = gui.addFolder('THREE.MeshLambertMaterial');

meshLambertMaterialFolder.addColor(data, 'color').onChange(() => { material.color.setHex(Number(data.color.toString().replace('#', '0x'))) });
//meshLambertMaterialFolder.addColor(data, 'emissive').onChange(() => { material.emissive.setHex(Number(data.emissive.toString().replace('#', '0x'))) });
meshLambertMaterialFolder.add(material, 'wireframe');
meshLambertMaterialFolder.add(material, 'wireframeLinewidth', 0, 10);
meshLambertMaterialFolder.add(material, 'flatShading').onChange(() => updateMaterial())
meshLambertMaterialFolder.add(material, 'combine', options.combine).onChange(() => updateMaterial())
meshLambertMaterialFolder.add(material, 'reflectivity', 0, 1);
meshLambertMaterialFolder.add(material, 'refractionRatio', 0, 1);
meshLambertMaterialFolder.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 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.MeshLambertMaterial = new THREE.MeshLambertMaterial()

// 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(),
};

var meshLambertMaterialFolder = gui.addFolder('THREE.MeshLambertMaterial');

meshLambertMaterialFolder.addColor(data, 'color').onChange(() => { material.color.setHex(Number(data.color.toString().replace('#', '0x'))) });
meshLambertMaterialFolder.addColor(data, 'emissive').onChange(() => { material.emissive.setHex(Number(data.emissive.toString().replace('#', '0x'))) });
meshLambertMaterialFolder.add(material, 'wireframe');
meshLambertMaterialFolder.add(material, 'wireframeLinewidth', 0, 10);
meshLambertMaterialFolder.add(material, 'flatShading').onChange(() => updateMaterial())
meshLambertMaterialFolder.add(material, 'combine', options.combine).onChange(() => updateMaterial())
meshLambertMaterialFolder.add(material, 'reflectivity', 0, 1);
meshLambertMaterialFolder.add(material, 'refractionRatio', 0, 1);
meshLambertMaterialFolder.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();

Lambertian Reflectance