Advanced Reflections in CS:GO... and for Source 2?

When I saw Lunacy's stars, I knew something strange was going on. It goes deeper than I thought.
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CONTENT FROM THIS VIDEO:
Parallax cubemaps in Source - https://youtu.be/ZH6s1hbwoQQ
Valve dev on it - https://developer.valvesoftware.com/wiki/Parallax_Corrected_Cubemaps
Siggraph 2012 - https://seblagarde.files.wordpress.com/2012/08/parallax_corrected_cubemap-siggraph2012.pdf

MUSIC USED
0:00 - They Have Returned - https://youtu.be/MnNqnpZ5bHQ
5:48 - Half Life 2 - Lab Practicum - https://youtu.be/Bg8lJMWBbdI

Видео Advanced Reflections in CS:GO... and for Source 2? канала 3kliksphilip