Terrasect

## What is Terrasect? Terrasect lets you divide your Minecraft world into named **regions** — laid out as a hex grid, Voronoi cells, recursive subdivisions, surround shapes, or scattered islands — and give each region its own rules for how the world generates there. One region can be a lush, gentle plain; its neighbor a jagged, monster-infested wasteland with its own loot table — all in the same world, all from the same seed, every time. Nothing here is random per-visit: the same seed always produces the same layout, so a region you found once will still be there next time. ## Issues and suggestions Found a bug, or have an idea for something Terrasect should do? Open an issue on the (https://github.com/let-value/terrasect/issues) — bug reports and suggestions are both welcome. ## Features - **Terrain & climate shaping.** Push a region's terrain flatter or rougher, and override its temperature, humidity, and other climate values independently of the surrounding world. - **Height limits.** Cap how high or low a region is allowed to build. - **Structure control.** Allow, block, or force specific structures (or whole mod/structure-tag groups) inside a region — want every plains village replaced with a pillager outpost? Done. - **Mob spawn control.** Allow or block specific mobs (or entire mob tags) from spawning in a region, both during world generation and during normal play. - **Loot control.** Allow or block loot table entries (or loot tags) inside a region. - **Five ways to lay out regions.** Hex grid, Voronoi cells, recursive subdivision, surround shapes, and scattered archipelagos — pick whichever shape language fits the world you're building. - **Simple config, or code if you want it.** Define regions in plain text preset files, or build them programmatically if you're writing your own add-on. - **Built to stay fast.** Region lookups are cached per chunk, so adding a lot of regions doesn't mean a laggy world. ## Supported versions | Minecraft | Fabric | NeoForge | |---|---|---| | 1.20.1 | ✅ | — | | 1.21.1 | ✅ | ✅ | | 1.21.11 | ✅ | ✅ | | 26.1 | ✅ | ✅ | | 26.2 | ✅ | ✅ | Fabric builds additionally require **Fabric API** and **Fabric Language Kotlin**. NeoForge builds additionally require **Kotlin for Forge**. Grab the matching dependency versions from the same release page as the Terrasect jar you download. ## Quick start 1. Install Terrasect and its loader-specific Kotlin dependency (see above) like any other mod. 2. Launch the world once — Terrasect creates a `config/terrasect/` folder with an example preset and a `config.toml` file. No preset is active yet at this point, so world generation is untouched. 3. Open `config/terrasect/config.toml` and set `preset` to the name of a preset file in that folder (without the `.toml` extension) to activate it. 4. Restart the game or server. Config changes are only read on startup. See (#getting-started) below for a step-by-step walkthrough, the complete region/strategy reference (with pictures), and dedicated pages for noise, structures, and loot constraints. ## Known limitations Terrasect is under active development. A few preset options are accepted today but don't yet change generation: enforcing a region's height limits and overriding precipitation or an inherited climate preset. These are recognized and validated, just not wired up to world generation yet — check the project's Known Issues page for the current state before relying on them. ## License & AI disclosure Terrasect is MIT licensed — use it, fork it, learn from it. LLMs were used extensively in building this mod, and some of the codebase is admittedly rough around the edges as a result. The point of this project was the idea — region-based world generation control — not a polished implementation. If you want to take the idea further in your own mod, you're encouraged to; we'd love to hear about it.