OBJ Model Loader

Video Lecture

OBJ Model Loader OBJ Model Loader

Description

Used for loading 3d models saved in the Wavefront OBJ format.

There are many DCC (Digital Content Creation) tools that can create models in OBJ format.

In Threejs, when importing an OBJ, the default material will be a white meshPhongMaterial so you will need at least one light in your scene.

Start Code

./src/server/server.ts

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import express from "express"
import path from "path"
import http from "http"

const port: number = 3000

class App {
    private server: http.Server
    private port: number

    constructor(port: number) {
        this.port = port
        const app = express()
        app.use(express.static(path.join(__dirname, '../client')))
        app.use('/build/three.module.js', express.static(path.join(__dirname, '../../node_modules/three/build/three.module.js')))
        app.use('/jsm/controls/OrbitControls', express.static(path.join(__dirname, '../../node_modules/three/examples/jsm/controls/OrbitControls.js')))
        app.use('/jsm/loaders/OBJLoader', express.static(path.join(__dirname, '../../node_modules/three/examples/jsm/loaders/OBJLoader.js')))
        app.use('/jsm/libs/stats.module', express.static(path.join(__dirname, '../../node_modules/three/examples/jsm/libs/stats.module.js')))

        this.server = new http.Server(app);
    }

    public Start() {
        this.server.listen(this.port, () => {
            console.log(`Server listening on port ${this.port}.`)
        })
    }
}

new App(port).Start()

./src/client/client.ts

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

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

var light = new THREE.PointLight();
light.position.set(2.5, 7.5, 15)
scene.add(light);

const camera: THREE.PerspectiveCamera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000)
camera.position.z = 3

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)

//const material: THREE.MeshBasicMaterial = new THREE.MeshBasicMaterial({ color: 0x00ff00, wireframe: true })

const objLoader: OBJLoader = new OBJLoader();
objLoader.load(
    'models/cube.obj',
    (object) => {
        //(<THREE.Mesh>object.children[0]).material = material
        // object.traverse(function (child) {
        //  if ((<THREE.Mesh>child).isMesh) {
        //      (<THREE.Mesh>child).material = material
        //  }
        // })
        scene.add(object);
    },
    (xhr) => {
        console.log((xhr.loaded / xhr.total * 100) + '% loaded')
    },
    (error) => {
        console.log(error);
    }
)

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 animate = function () {
    requestAnimationFrame(animate)

    controls.update()

    render()

    stats.update()
};

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

Wavefront .obj File Format