Mixing PixiJS and Three.js

[BlackRam-oss]

https://pixijs.com/8.x/guides/advanced/mixing-three-and-pixi

Pixi js provides the ability to merge Three.js with a 2D canvas.

This brings various possibilities for development.

I should understand

1. how to merge pixijs with Three.js and understand how they interact
2. if it is possible to save the current state of Three.js