I wonder as well

Halo 2 Vista included more detailed bump map textures for a number of weapons, I would hazard a guess to say those are the textures being used by the mod.

It's a bit strange though because the MCC version of Halo 2 originally used the H2V textures, but the big Halo 2 fixes update a few years ago restored the OG Xbox versions, so I'm not sure why they were reverted back to the less faithful Vista textures with this mod which is going for 1:1 Xbox parity visuals.

引用自 BaileyJIII：

Halo 2 Vista included more detailed bump map textures for a number of weapons, I would hazard a guess to say those are the textures being used by the mod.

It's a bit strange though because the MCC version of Halo 2 originally used the H2V textures, but the big Halo 2 fixes update a few years ago restored the OG Xbox versions, so I'm not sure why they were reverted back to the less faithful Vista textures with this mod which is going for 1:1 Xbox parity visuals.

I'd assume because they look good and match the game's look already, plus the game is being run at up to 4K on modern displays. So the higher res bump maps would look nicer.