The majority of join ups are beginners, so the first session will be an introduction to WebGL.
We won't have the room for long so I'll try to cover a lot of ground quickly -- setting-up with and without THREE.js, debugging, basic interaction and simple animation.
A laptop with a browser that supports WebGL (http://get.webgl.org/) and an editor.
If you're planning on attending please RSVP and register on the SkillsMatter site (http://skillsmatter.com/event-details/home/webgl-workshop-london).
While we're waiting you may like to take a look at the excellent *free* WebGL course on Udacity by Eric Haines https://www.udacity.com/course/cs291.