The fuck? Is it just me or does this game use textures very inefficiently? I mean, what kind of 10 hr game could possibly require 75GBs to look good?
Just Cause 2 looked good with a ~5GB game folder
The Witcher 2 had sharp textures with a 14GB game folder
I forgot how large the Metro 2033 folder size is, but it's definitely no larger than 20 GBs, and the textures are amazing in that game.
Most games use the same small textures repeatedly everywhere you look. The same graffiti everywhere, the same walls repeated, etc. In some ways its more efficient, but so is using stick figures.
This game uses a single huge texture that can be compressed or uncompressed on the fly. If your frame rate drops below 60fps, it compresses the textures a bit more to get you back up to speed. It can compress the textures so much it can play on an iPhone and because of the small screen it still looks good, while the dynamic compression insures your frame rate never drops.
Because it is one huge texture every surface can look unique. The high texture pack is actually the uncompressed or less compressed version of the same textures the original artists used. Instead of limiting the artist to just a few textures for a scene, they can change any pixel they want and use whatever textures they want.
The next version of this engine planned will do the same thing for geometry allowing for real time ray tracing. It won't be photo realistic, but if your machine is powerful enough it will have all the textures and all the real curves and geometry that the artist can draw. No more repeated boxes and desks and no more triangles and wire frame objects.