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Documents and Specifications

Three.js – documentation
JSON Model format 3.0

F.A.Q.
What are the major features in Three.js?
Which import format / exporter should I use?
How to use Blender export script?
How to use OBJ converter script?
How to update things with WebGLRenderer?
How to run things locally?

Why do examples use requestAnimationFrame?
Why are there meta viewport tags in examples?
How to change color of Fog?
Are there tools to help me build a scene in Three.js?
How Matrices work in Three.js
How to preserver scene scale when resizing window?

Articles
Getting Started
Drawing lines
Using Matrices and Object3D
Using SketchUp Models
build.py, or how to generate a compressed Three.js file
Text in Three.js

Components
WebGLRenderer
Uniforms types

On the nets…

Articles
Animated selective glow in Three.js by BKcore
Max to Three.js workflow tips and tricks by BKcore
On the twelfth day of Xmas, take a whirlwind look at Three.js by Paul King
Introduction to Three.js by Ilmari Heikkinen
Getting Started with Three.js by Paul Lewis
An Introduction to Shaders – Part 1 by Paul Lewis
An Introduction to Shaders – Part 2 by Paul Lewis
Creating Particles with Three.js by Paul Lewis

More Documentation
Walking Map
Three.js doc – extensive links to source code & where used in examples
THREE.JS API Reference – with realtime search

News & Updates
Learning WebGL Blog – The authoritaive and elegant news source for WebGL
Three.js on Google+ – frequent posts on Three.js
Subreddit for Three.js – updated almost daily with the latest demos built with Three.js
Subreddit for WebGL – frequently updated
webgl.com – about half the posts relate to Three.js

Tools
Three.js Inspector
ThreeFab
ThreeNodes.js
ThreeBuilds – provides debug and historical versions of Three.js

Tutorials & Courses
Three.js Examples
Guida a ThreeJS – Three.js tutorial in Italian
Building A Physics Simulation Environment – Three.js tutorial in Japanese
Einstieg in WebGL mit three.js – Three.js tutorial in German
Learning Three.js – blog where each post is dedicated to teaching an aspect of Three.js

People and Videos
Mr.doob on Google+
WebGL Camp 3, Altered Qualia Presentation