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Three.js Fundamentals

This is a series of lessons or tutorials about three.js.

This is work in progress. Feel free to contribute, especially localizations


Of course bug fixes are always welcome.

If you'd like to write a new article please try to always take one step at a time. Don't do 2 or more things in a single step. Explain any new math in the simplest terms possible. Ideally with diagrams where possible. Also it's probably best to ask to make sure someone else isn't already working on a similar article.

Article notes

A code word in a paragraph, as in

A `BoxBufferGeometry` makes a box.

Will get automatically turned into a link to the THREE.js docs if the word happens to be one of the names in the three.js library. Similarly adding a .property as in

Use `Material.opacity` to set the opacity level.

Will get turned into a link to the three.js Material docs with an hash to opacity.

The link itself will also be checked similarly so for example

We can set the color by hsl using [material.setHSL(hue, saturation, level)](MeshBasicMaterial.setHSL) and
passing in values from 0 to 1 for each of `hue`, `saturation` and `level`.

The [stuff](Material.setHSL) will get turned into a link to the docs

Currently this happens in the browser, not at build time.


Each translation goes in a folder under threejs/lessons/<country-code>.

Required files are



Defines various language specific options. Hanson is a JSON like format but allows comments.

Current fields are

  // The language (will show up in the language selection menu)
  language: 'English',

  // Phrase that appears under examples
  defaultExampleCaption: "click here to open in a separate window",

  // Title that appears on each page
  title: 'Three Fundamentals',

  // Basic description that appears on each page
  description: 'Learn Three.js',

  // Link to the language root.
  link: '',  // replace `ja` with country code

  // html that appears after the article and before the comments
  commentSectionHeader: '<div>Questions? <a href="">Ask on stackoverflow</a>.</div>\n        <div>Issue/Bug? <a href="">Create an issue on github</a>.</div>',

  // markdown that appears for untranslated articles
  missing: "Sorry this article has not been translated yet. [Translations Welcome](! 😄\n\n[Here's the original English article for now]({{{origLink}}}).",

  // the phrase "Table of Contents"
  toc: "Table of Contents",

  // translation of categories
  categoryMapping: {
    'basics': 'Basics',
    'solutions:' 'Solutions',
    'webvr': 'WebVR',
    'optimization': 'Optimization',
    'tips': 'Tips',
    'fundamentals': 'Fundamentals',
    'reference': 'Reference',


This is the template for the main page for each language


This is template for the table of contents for the language. It is included on both the index and on each article. The only parts not auto-generated are the links ending links which you can translate if you want to. The build system will create a placeholder for every English article for which there is no corresponding article in that langauge. It will be filled the missing message from above.

Translation notes

The build process will make a placeholder html file for each article has an english .md file in threejs/lessons but no corresponding .md file for the language. This is to make it easy to include links in one article that links to another article but that other article has not yet been translated. This way you don't have to go back and fix already translated articles. Just translate one article at a time and leave the links as is. They'll link to placeholders until someone translates the missing articles.

Articles have front matter at the top

Title: Localized Title of article
Description: Localized description of article (used in RSS and social media tags)
Cateogry: category for article **THIS STAYS IN ENGLISH**
TOC: Localized text for Table of Contents

DO NOT CHANGE LINKS : For example a link to a local resources might look like



<img src="somelink">

While you can add query parameters (see below) do not add "../" to try to make the link relative to the .md file. Links should stay as though the article exists at the same location as the original English.

To build

The site is built into the out folder


git clone
npm install
npm run build
npm start

now open your browser to http://localhost:8080

Continuous build

You can run npm run watch to get continuous building. Only the article .md files and files that are normally copied are supported. The table of contents, templates, and index pages are not watched.

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