Maybe I skimmed too much but Chapter 1 seemed mostly irrelevant to me. It'd be like taking a car mantainence class and them starting at atoms and how atoms work in metals and how metals are magnetic or whatever, before finally getting to things that car mechanics actually care about. Maybe that's helpful to some.

I know this is going to sound critical, but part of me wondered if this wasn't a vibe coded project. The visuals are impressive, but you can go ask gemini canvas to make them and it will. Here's an example

https://jsbin.com/webudilaha/edit?html,output

PS: you need to close the banner at the top I think in order to be able to see the roughness slider.

It needs a little TLC but it works. Even if they weren't vibe coded, I mostly wanted to pass on they probably can be, for anyone who might find that useful for making more articles like this. Even if they just get you started.

Still, cool article!