This is a complete Terrain overhaul, Ultra High Quality textures,
most textures are made from 6000px photographs that i made myself.
So these are my property, don't sell them and don't redistribute them without my conscent.
The textures could even look better if i would use less deep normals, but then you wouldn't see the depth as well that you get from the engine's light scattering, so i decided to keep them like this, sadly the photographic quality of the diffuse texture gets a bit stretched, so it is always a question of keeping it somewhere in the middle. I did use uncompressed normals for the biggest part to make sure you have the best quality, Gamebryo doesn't handle compressed normals very well, you get blocky artifacts with compressed normals, bad material shaders i guess.

I made this terrain to disguise the the absence of decent foliage in the game, i had a grassmod before,
but the grass doesn't render all that far in the distance and it annoyed me that it suddenly stopped,
so i made some terrain and LOD that simulates grass and foliage being there, it works fine for me.
The New Vegas version is more desert like however, and has less foliage obviously.
(Thanks to Hitman47101 i've learned that NVAC gives you some extra grassrange, and the nice thing is,
NVAC also works with FO3, and there it looks even better with more grass.)

Most of the textures are terrain textures, keep that in mind when you look at the filesizes, that means that the terrain textures do the most harm to performance cause every texture takes up 2,66+2,66 MB, some even have a heightmap adding a extra 2,66 mb.
That's why the roads and rocks do not differ all that much, cause they are only a few textures and won't fill up your VRAM, the entire terrain will however.

Main Roads : 4096x4096px DXT3 1bit Alpha (10,6MB), 2048x2048px 16bit uncompressed normal (10,6MB)
Terrain Textures : 2048x2048px DXT1 (2,66MB), 1024x1024px 16bit uncompressed normals (2,66MB)
Main Rocks : 4096x4096px DXT1 (10,6MB), 2048x2048px 16bit uncompressed normal (10,6MB)

Wasteland diffuse LOD (terrain) files are 384 pixels instead of 256 and colored correctly to match the textures.

Wasteland Block LOD file : electricity pylons, metro rail pylons, camp golf hotel, prospector saloon, victor's shack, helios one,
joshua trees, water towers, destroyed houses, rock and road lod are all high-res.

install;
unpack and drop Data folder in your Fallout install dir.
works with TTW too.