Specular Map

Video Lecture

Specular Map
Specular Map

Description

The Specular map is a texture image that affects the specular surface highlight, and in the case of the MeshPhongMaterial, it also affects the environment map.

The MeshLambertMaterial, MeshPhongMaterial and the MeshToonMaterial have the SpecularMap option.

To adjust the intensity of the specular surface highlight, then use the materials specular and shininess properties.

To adjust the environment map intensity, use the materials reflectivity property.

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(0, 5, 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.screenSpacePanning = true //so that panning up and down doesn't zoom in/out
//controls.addEventListener('change', render)

const planeGeometry: THREE.PlaneGeometry = new THREE.PlaneGeometry()//3.6, 1.8)

const material: THREE.MeshPhongMaterial = new THREE.MeshPhongMaterial()

const texture = new THREE.TextureLoader().load("img/grid.png")
//const texture = new THREE.TextureLoader().load("img/worldColour.5400x2700.jpg")
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"])
//const envTexture = new THREE.CubeTextureLoader().load(["img/px_eso0932a.jpg", "img/nx_eso0932a.jpg", "img/py_eso0932a.jpg", "img/ny_eso0932a.jpg", "img/pz_eso0932a.jpg", "img/nz_eso0932a.jpg"])
// envTexture.mapping = THREE.CubeReflectionMapping
// material.envMap = envTexture

//const specularTexture = new THREE.TextureLoader().load("img/grayscale-test.png")
//const specularTexture = new THREE.TextureLoader().load("img/earthSpecular.jpg")
//material.specularMap = specularTexture

const plane: THREE.Mesh = new THREE.Mesh(planeGeometry, material)
scene.add(plane)

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, 'flatShading').onChange(() => updateMaterial())
meshPhongMaterialFolder.add(material, 'combine', options.combine).onChange(() => updateMaterial())
meshPhongMaterialFolder.add(material, 'reflectivity', 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(0, 5, 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.screenSpacePanning = true //so that panning up and down doesn't zoom in/out
//controls.addEventListener('change', render)

const planeGeometry: THREE.PlaneGeometry = new THREE.PlaneGeometry(3.6, 1.8)

const material: THREE.MeshPhongMaterial = new THREE.MeshPhongMaterial()

//const texture = new THREE.TextureLoader().load("img/grid.png")
const texture = new THREE.TextureLoader().load("img/worldColour.5400x2700.jpg")
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"])
const envTexture = new THREE.CubeTextureLoader().load(["img/px_eso0932a.jpg", "img/nx_eso0932a.jpg", "img/py_eso0932a.jpg", "img/ny_eso0932a.jpg", "img/pz_eso0932a.jpg", "img/nz_eso0932a.jpg"])
envTexture.mapping = THREE.CubeReflectionMapping
material.envMap = envTexture

//const specularTexture = new THREE.TextureLoader().load("img/grayscale-test.png")
const specularTexture = new THREE.TextureLoader().load("img/earthSpecular.jpg")
material.specularMap = specularTexture

const plane: THREE.Mesh = new THREE.Mesh(planeGeometry, material)
scene.add(plane)

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, 'flatShading').onChange(() => updateMaterial())
meshPhongMaterialFolder.add(material, 'combine', options.combine).onChange(() => updateMaterial())
meshPhongMaterialFolder.add(material, 'reflectivity', 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();