@badlogic Interested. :) The previous posts were quite enjoyable!

@Rhevian @nick Yes that's a cubemap used in GTA V for reflections. You can see it on this page: https://www.adriancourreges.com/blog/2015/11/02/gta-v-graphics-study/

@mamoniem A gold mine of information, thanks!
Re: "very time consuming process, and I’ve been investing almost all my weekends free time in those articles", I can definitely relate to that bit. 😉
Added to the list: https://www.adriancourreges.com/blog/2020/12/29/graphics-studies-compilation/