There's not much info in the video there. But if you search star citizen virtual terrain texturing there are some interesting links, like https://www.adobe.com/products/substance3d/magazine/star-citizen-texturing-sci-fi-open-world-game-substance.html
I'm working on a star destroyer model, you know, the big white spaceship darth vader is in from star wars, and what I'm looking for is some good refrence, which (also) covers the inside of the thing, I can't find this myself, so that's why I'm asking. Thanks Hoi