ATG Modified is a Port of ATG (Alternative Terrain Generator) to 1.12.2. The mod ATG was left abandoned by its author in 1.11.2 and several people including us have tried to port and maintain it. The author has been MIA for a little over 2 years. I am doing this port under fair use because I don’t want to be a jerk for doing this. 100% of Curse Credits are going to the original authors of the mod.

About ATG:

Alternate Terrain Generation (ATG) is a complete replacement for the vanilla overworld terrain generator which radically changes the way the world looks, and the way in which you will play. It was originally created for Minecraft 1.5 to address issues with the juxtaposition of hot and cold biomes, and to introduce more realism into the way the world was generated as a whole.

Rather than picking a biome for a region and then building the terrain for that biome, ATG generates a series of fields for height, temperature, rainfall and more, in order to derive the final biome from these. The result is a smoother variation in the terrain, and biomes which would realistically be found adjacent to one another.

ATG also adds a noticeable degree of verticality to the world, and you may find flat plateaus on the sides of rolling hills as high as 150or more, with the biggest of the snow-capped mountains reaching 240 or more.

Version 2.0.0 is a complete rewrite, making full use of new techniques that I have learned over the last few years. There's a lot more flat land, islands, cliffs, better biome distribution, while still having the trademark height variance of the older versions (though more spaced out in general.)

Additionally, due to a total rework of the internal framework for generation, it's fast. Really fast. The biome generation stage of generation, which was the slowest part in previous versions is now over 8 times faster than vanilla. This doesn't translate to 8x faster chunk output, but it's a noticeable difference.