what's a good set of tutorials on modern webgl?

anyone here got text renering to work in webgl? textures look bad, so it's either signed-distance-field or vector-textures, and both seem non trivial to implement

https://medium.com/@evanwallace/easy-scalable-text-rendering-on-the-gpu-c3f4d782c5ac

has one technique

and it looks like he's using this lib to get the bezier data out of the font file

http://opentype.js.org/index.html

what is this type of chart called?

http://i.imgur.com/YlhUDdv.png

where each box represents the relative size of a sample in the population

@luxbock I think they are called heat charts - http://prcweb.co.uk/circularheatchart/