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MeshMatcapMaterial

Video Lecture

MeshMatcapMaterial MeshMatcapMaterial MeshMatcapMaterial

Description

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

MatCap (Material Capture) shader uses an image of a sphere as a view-space environment map. The image contains pre baked colours and shading.

Resources

The image files used in this lesson can be downloaded from the file named matcap-textures.zip. Extract the matcap-textures.zip contents into the ./dist/client/img/ folder.

matcap-textures.zip

Lesson 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 'three/examples/jsm/libs/dat.gui.module'

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

// const light = new THREE.PointLight(0xffffff, 2);
// 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.MeshMatcapMaterial()

// 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 matcapTexture = new THREE.TextureLoader().load('img/matcap-opal.png')
//const matcapTexture = new THREE.TextureLoader().load("img/matcap-crystal.png")
//const matcapTexture = new THREE.TextureLoader().load("img/matcap-gold.png")
//const matcapTexture = new THREE.TextureLoader().load("img/matcap-red-light.png")
//const matcapTexture = new THREE.TextureLoader().load("img/matcap-green-yellow-pink.png")
material.matcap = matcapTexture

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

const 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()

const data = {
    color: material.color.getHex(),
}

const meshMatcapMaterialFolder = gui.addFolder('THREE.MeshMatcapMaterial')
meshMatcapMaterialFolder.addColor(data, 'color').onChange(() => {
    material.color.setHex(Number(data.color.toString().replace('#', '0x')))
})
meshMatcapMaterialFolder
    .add(material, 'flatShading')
    .onChange(() => updateMaterial())
meshMatcapMaterialFolder.open()

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

function animate() {
    requestAnimationFrame(animate)

    render()

    stats.update()
}

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

animate()

MeshMatcapMaterial