Before getting started with three.js, I decided to learn a bit of webgl. Followed lessons from this blog.
http://learningwebgl.com/blog/?p=1786
Author: Kyle Maxwell
To run the http-server use yarn start
Navigate to http://localhost:8080/
You should see some cubes with a texture of a house and clouds. There is a faint occlusion effect when the cubes make a concave corner. The algorithm could really use some work.