GLTF Model Loader
Video Lecture
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Description
A loader for loading glTF models into the Threejs scene.
glTF is a specification for the efficient transmission and loading of 3D scenes and models.
glTF minimizes both the size of 3D assets, and the runtime processing needed to unpack and use those assets.
A glTF file may contain one or more scenes, meshes, materials, textures, skins, skeletons, morph targets, animations, lights and cameras.
Assets can be provided in either JSON (.gltf) or binary (.glb) format.
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 models3.zip. Extract the models3.zip contents into the ./dist/client/models/ folder.
models3.zip
Start Script
./src/client/client.ts
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85 import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader'
import Stats from 'three/examples/jsm/libs/stats.module'
const scene = new THREE . Scene ()
scene . add ( new THREE . AxesHelper ( 5 ))
const light = new THREE . SpotLight ()
light . position . set ( 5 , 5 , 5 )
scene . add ( light )
const camera = new THREE . PerspectiveCamera (
75 ,
window . innerWidth / window . innerHeight ,
0.1 ,
1000
)
camera . position . z = 2
const renderer = new THREE . WebGLRenderer ()
// renderer.physicallyCorrectLights = true //deprecated
// renderer.useLegacyLights = false //use this instead of setting physicallyCorrectLights=true property
// renderer.shadowMap.enabled = true
// renderer.outputEncoding = THREE.sRGBEncoding
renderer . setSize ( window . innerWidth , window . innerHeight )
document . body . appendChild ( renderer . domElement )
const controls = new OrbitControls ( camera , renderer . domElement )
controls . enableDamping = true
const loader = new GLTFLoader ()
loader . load (
'models/monkey.glb' ,
function ( gltf ) {
// gltf.scene.traverse(function (child) {
// if ((child as THREE.Mesh).isMesh) {
// const m = (child as THREE.Mesh)
// m.receiveShadow = true
// m.castShadow = true
// }
// if (((child as THREE.Light)).isLight) {
// const l = (child as THREE.Light)
// l.castShadow = true
// l.shadow.bias = -.003
// l.shadow.mapSize.width = 2048
// l.shadow.mapSize.height = 2048
// }
// })
scene . add ( gltf . scene )
},
( 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 ()
Final Script
./src/client/client.ts
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85 import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader'
import Stats from 'three/examples/jsm/libs/stats.module'
const scene = new THREE . Scene ()
scene . add ( new THREE . AxesHelper ( 5 ))
// const light = new THREE.SpotLight();
// light.position.set(5, 5, 5)
// scene.add(light);
const camera = new THREE . PerspectiveCamera (
75 ,
window . innerWidth / window . innerHeight ,
0.1 ,
1000
)
camera . position . z = 2
const renderer = new THREE . WebGLRenderer ()
// renderer.physicallyCorrectLights = true //deprecated
renderer . useLegacyLights = false //use this instead of setting physicallyCorrectLights=true property
renderer . shadowMap . enabled = true
// renderer.outputEncoding = THREE.sRGBEncoding
renderer . setSize ( window . innerWidth , window . innerHeight )
document . body . appendChild ( renderer . domElement )
const controls = new OrbitControls ( camera , renderer . domElement )
controls . enableDamping = true
const loader = new GLTFLoader ()
loader . load (
'models/monkey.glb' ,
function ( gltf ) {
gltf . scene . traverse ( function ( child ) {
if (( child as THREE . Mesh ). isMesh ) {
const m = child as THREE . Mesh
m . receiveShadow = true
m . castShadow = true
}
if (( child as THREE . Light ). isLight ) {
const l = child as THREE . Light
l . castShadow = true
l . shadow . bias = - 0.003
l . shadow . mapSize . width = 2048
l . shadow . mapSize . height = 2048
}
})
scene . add ( gltf . scene )
},
( 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 ()
Useful Links
glTF Overview
GLTFLoader (Official Documentation)
Paperback 
