I followed this tutorial by Jerome Etienne on generating a procedural city using Three.js.

The tutorial was a way to learn more about Three.js. Most of my time was spent figuring out how to update methods used in the tutorial (r59) that are deprecated in newer versions of Three.js (I was using r73).

See it action here

Some pictures from debugging

Removing texture from roof - before

after

Fun times with the roof texture location when attempting to merge buildings

Testing that both vertexColor and base color work