Any guys know how this fluids are created? Is there a example about it?

Hi, This is a university home page. https://www.grad.osaka-geidai.ac.jp/
From its source code, the fluids picture is made by three.js
The web is made by react, and the fluids picture’s position is static/js/lib.
But I couldn’t understand its code. Is there a library or example about it?