[pdehaan]

I haven't looked into MegaTexture much, but from what I can tell it doesn't repeat terrain textures.

In most modern games, smaller textures are tiled over larger areas, allowing for lots of detail for less memory at the expense of variation. Most do something to mix it up (mixtures of textures, adding random variations), but it ultimately constrains what can be done.

MegaTexture seems to solve the problem of using a single large texture by streaming only the parts needed, but requires much more data on the disk to match the detail level of tiling.