Magiz is a JavaScript library for generating Lightweight Building Model
It has been optimized for lightweight data structures, generation logic, rendering efficiency, and cross platform capabilities, making it suitable for displaying city level model scenes on the web.
Appreciate feedback or suggestions 
, pls check out:
https://charlesooo.github.io/magiz-demo/
Demo 1. Another Marseille
Convert the Marseille apartment designed by famous architect Corbusier into a parametric style
Demo 2. Infinite city
an urban scene of 1917 parameterized buildings