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Three.js and TypeScript
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Design Patterns in TypeScript
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Stats Panel

Video Lecture

Stats Panel Stats Panel

Description

Adding the Stats panel to the document using TypeScript.

Start Script

Begin the lesson using this client.ts below.

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'

const scene = new THREE.Scene()

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.z = 2

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

const controls = new OrbitControls(camera, renderer.domElement)
controls.addEventListener('change', render)

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

const cube = new THREE.Mesh(geometry, material)
scene.add(cube)

window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight
    camera.updateProjectionMatrix()
    renderer.setSize(window.innerWidth, window.innerHeight)
    render()
}

// function animate() {
//     requestAnimationFrame(animate)

//     cube.rotation.x += 0.01
//     cube.rotation.y += 0.01

//     render()
// }

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

//animate()
render()

Final Scripts

Below is the client.ts how it is left at the end of the lesson.

Note

If using @three/types@0.150.0 or higher, you now need to add the option "allowSyntheticDefaultImports": true to your TSConfig.json for the Stats import to work. See Add the initial Scripts

./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'

const scene = new THREE.Scene()

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.z = 2

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

const controls = new OrbitControls(camera, renderer.domElement)
//controls.addEventListener('change', render)

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

const cube = new THREE.Mesh(geometry, material)
scene.add(cube)

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)

    cube.rotation.x += 0.01
    cube.rotation.y += 0.01

    render()

    stats.update()
}

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

animate()
//render()

Boilerplate stats Branch

The official course boilerplate contains a branch including the Stats panel if you need.

You can clone the boilerplate into a new folder somewhere and checkout the stats branch.

git clone https://github.com/Sean-Bradley/Three.js-TypeScript-Boilerplate.git
cd Three.js-TypeScript-Boilerplate
git checkout stats
npm install
npm run dev

Visit http://127.0.0.1:8080/

With the Stats panel

Troubleshooting

Error : This module is declared with 'export =', and can only be used with a default import when using the 'allowSyntheticDefaultImports' flag.

@types/three@0.150.0 and later changed the way we use stats.module.

We now need to add "allowSyntheticDefaultImports": true to our tsconfig.json

Example,

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{
    "compilerOptions": {
        "target": "ES6",
        "moduleResolution": "node",
        "strict": true,
        "allowSyntheticDefaultImports": true
    },
    "include": ["**/*.ts"]
}

And we also now need to instantiate using the syntax,

const stats = new Stats()

In previous versions of @types/three, we could use the syntax,

const stats = Stats()

'new' expression, whose target lacks a construct signature, implicitly has an 'any' type

If using @types/three@0.148.0 or earlier with stats.module, instantiating a new Stats() (using the new keyword) would cause the error new' expression, whose target lacks a construct signature, implicitly has an 'any' type since stats is exported as a function and not a class.

In @types/three@0.148.0 and earlier, you could use the syntax,

const stats = Stats()

In @types/three@0.149.0 and later, you now need to add "allowSyntheticDefaultImports": true to your tsconfig.json, instantiate stats using the syntax,

const stats = new Stats()