Displacement Map

Video Lecture

Displacement Map Displacement Map

Description

A displacement map, is an image that can be used to alter the geometry of a mesh. The value of each pixel is used to change the position of the vertices of the mesh.

Start Script

./src/client/client.ts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
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)//, 360, 180)

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_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/earthSpecular.jpg")
// material.specularMap = specularTexture

const displacementMap = new THREE.TextureLoader().load("img/gebco_bathy.5400x2700_8bit.jpg")
material.displacementMap = displacementMap

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,
    }
}
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.meshPhongMaterialFolder');

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, 'reflectivity', 0, 1)
meshPhongMaterialFolder.add(material, 'refractionRatio', 0, 1)
meshPhongMaterialFolder.add(material, 'displacementScale', 0, 1, 0.01)
meshPhongMaterialFolder.add(material, 'displacementBias', -1, 1, 0.01)
meshPhongMaterialFolder.open()

// var planeData = {
//     width: 3.6,
//     height: 1.8,
//     widthSegments: 1,
//     heightSegments: 1
// };
// const planePropertiesFolder = gui.addFolder("PlaneGeometry")
// //planePropertiesFolder.add(planeData, 'width', 1, 30).onChange(regeneratePlaneGeometry)
// //planePropertiesFolder.add(planeData, 'height', 1, 30).onChange(regeneratePlaneGeometry)
// planePropertiesFolder.add(planeData, 'widthSegments', 1, 360).onChange(regeneratePlaneGeometry)
// planePropertiesFolder.add(planeData, 'heightSegments', 1, 180).onChange(regeneratePlaneGeometry)
// planePropertiesFolder.open()

// function regeneratePlaneGeometry() {
//     let newGeometry = new THREE.PlaneGeometry(
//         planeData.width, planeData.height, planeData.widthSegments, planeData.heightSegments
//     )
//     plane.geometry.dispose()
//     plane.geometry = newGeometry
// }


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

var animate = function () {
    requestAnimationFrame(animate)

    render()

    stats.update()
};

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

Final Script

./src/client/client.ts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
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, 360, 180)

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_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/earthSpecular.jpg")
// material.specularMap = specularTexture

const displacementMap = new THREE.TextureLoader().load("img/gebco_bathy.5400x2700_8bit.jpg")
material.displacementMap = displacementMap

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,
    }
}
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.meshPhongMaterialFolder');

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, 'reflectivity', 0, 1)
meshPhongMaterialFolder.add(material, 'refractionRatio', 0, 1)
meshPhongMaterialFolder.add(material, 'displacementScale', -1, 1, 0.01)
meshPhongMaterialFolder.add(material, 'displacementBias', -1, 1, 0.01)
meshPhongMaterialFolder.open()

var planeData = {
    width: 3.6,
    height: 1.8,
    widthSegments: 360,
    heightSegments: 180
};
const planePropertiesFolder = gui.addFolder("PlaneGeometry")
//planePropertiesFolder.add(planeData, 'width', 1, 30).onChange(regeneratePlaneGeometry)
//planePropertiesFolder.add(planeData, 'height', 1, 30).onChange(regeneratePlaneGeometry)
planePropertiesFolder.add(planeData, 'widthSegments', 1, 360).onChange(regeneratePlaneGeometry)
planePropertiesFolder.add(planeData, 'heightSegments', 1, 180).onChange(regeneratePlaneGeometry)
planePropertiesFolder.open()

function regeneratePlaneGeometry() {
    let newGeometry = new THREE.PlaneGeometry(
        planeData.width, planeData.height, planeData.widthSegments, planeData.heightSegments
    )
    plane.geometry.dispose()
    plane.geometry = newGeometry
}


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

var animate = function () {
    requestAnimationFrame(animate)

    render()

    stats.update()
};

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