OBJ Model Loader

Video Lecture

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.

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Resources

The 3D models used in this lesson can be easily created using Blender. If you don't want to use blender to create the models, then you can download them from the zip file named models1.zip. Create a new folder named models inside the ./dist/client/ folder. Extract the models1.zip contents into the new folder.

models1.zip

Lesson Script

./src/client/client.ts

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

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

const light = new THREE.PointLight(0xffffff, 1000)
light.position.set(2.5, 7.5, 15)
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)

const controls = new OrbitControls(camera, renderer.domElement)
controls.enableDamping = true

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

const objLoader = new OBJLoader()
objLoader.load(
    'models/cube.obj',
    (object) => {
        // (object.children[0] as THREE.Mesh).material = material
        // object.traverse(function (child) {
        //     if ((child as THREE.Mesh).isMesh) {
        //         (child as THREE.Mesh).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 = new Stats()
document.body.appendChild(stats.dom)

function animate() {
    requestAnimationFrame(animate)

    controls.update()

    render()

    stats.update()
}

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

animate()