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CaveBiomesAPI

Mod adding custom world height limits and 3D biomes to 1.12.2!

Forge
Loaders
Forge
Downloads on Modrinth
1.6K
Followers on Modrinth
1
versions
5
Updated
August 31, 2026Aug 31
Published
in 2026
This is a library — other mods need it, and it adds nothing to the game by itselfRequired by 1 mods. Download it if another mod needs it.

At a glance

A library: other mods need it — required by 1 mods
Runs on Forge
For Minecraft 1.12.2
Needed in the game and on the server
Latest version — 1.1.3 from August 31, 2026
License GPL-3.0-or-later — free
Where it's needed
In gamerequiredOn serverrequired

Needed both in the game and on the server

Game versions1.12.2

CaveBiomesAPI

!!! It is a library mod! By defaultmeans byte-for-byte vanilla behavior. Everything is opt-in. !!!

CaveBiomesAPI is a core/library mod for Minecraft 1.12.2 designed specifically for mod developers. It significantly expands the vanilla world generation capabilities by introducing vertical (3D) biomes and custom world height limits.

If you've ever wanted to create massive underground ecosystems with different biomes stacked beneath the surface, or high mountains scrapping the sky, this API is for you!

Features

  • Vertical Biomes (3D Biomes): Allows developers to generate completely different biomes at varying Y-levels (heights) in the same column. You can easily stack different biomes one under another (e.g., a lush surface biome with a glowing mushroom cave biome directly underneath).
  • World Height Configuration: Gives modders the ability to easily configure and extend the world height limits in 1.12.2.
  • Developer-Friendly: Provides a clean and accessible API to integrate complex underground world generation into your own mods.

Requirements

  • Minecraft 1.12.2 / Forge 14.23.5.2864
  • MixinBootstrap (runtime dependency)

For Developers

  • Check the GitHub repo for API documentation and examples

FAQ

How to install CaveBiomesAPI?

Install Forge for your Minecraft version, download CaveBiomesAPI for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does CaveBiomesAPI support?

CaveBiomesAPI has builds for Minecraft 1.12.2.

Is CaveBiomesAPI needed on the server?

Needed in the game and on the server

License and source
GNU General Public License v3.0 or laterfree to use and share; changes to the mod itself must be published under the same license
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

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