Terrasect
by let-value
Terrasect splits a Minecraft world into named regions laid out on a hex grid or Voronoi cells, and each region can carry its own terrain, structure, mob and loot rules.
What it does
Each region is defined by plain text preset files, and the rules it applies are set per region: terrain climate and shaping, height limits, structure control, mob spawn control and loot control. A region can make its terrain flatter or rougher, cap how high it can be built, force or block specific structures, mob types and mob tags, and add or remove loot table entries. Regions are laid out with five methods, including hex grids, Voronoi cells, recursive subdivision and surrounding shapes, which can produce scattered islands.
The layout is seeded, so the same world seed always produces the same regions in the same places. Lookups that decide which region applies to a chunk are cached, so generation stays quick even when many regions are defined. The mod is licensed under the MIT License and is open source; its source code and issue tracker are public. Both the server and every player need the mod, and files exist for 1.20.1, 1.21.1, 1.21.11, 26.1, 26.1.2 and 26.2.
Key features
Per-region terrain rules
Each region can push its terrain flatter or rougher and set its own climate and height limits.
Structure, mob and loot control
Regions can force or block chosen structures and mobs, including whole mod or tag groups, and change loot table entries.
Five layout methods
Regions can be laid out on a hex grid, as Voronoi cells, through recursive subdivision, around surrounding shapes or as scattered islands.
Plain text presets
Regions are defined in simple configuration files, so a world can be shaped without code.
Seeded, cached layout
A given seed always yields the same region map, and per-chunk caching keeps lookups cheap as regions are added.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 2
How it compares
Natural Temperature is server-side only, uses a custom license and is not open source, with files for 1.20.1 – 26.3 on Fabric, Forge and NeoForge. CobbleRegions is also server-side only and carries the MIT License, but it is not open source and covers 1.21.1 – 1.21.11 on Fabric and NeoForge. Music Regions is a client and server mod under the MIT License, not open source, for 1.20.1 – 1.21.1, so it targets sound rather than terrain.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Terrasect | Fabric and NeoForge | 1.20.1 – 26.2 | Client and server | 2026-10-05 |
| Natural Temperature | Fabric, Forge and NeoForge | 1.20.1 – 26.3 | Server-side only | 2026-09-16 |
| CobbleRegions | Fabric and NeoForge | 1.21.1 – 1.21.11 | Server-side only | 2026-02-20 |
| Music Regions | Fabric and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-10-13 |
Questions
Does Terrasect need Fabric API on NeoForge?
Does Terrasect have to be installed on the server?
Can the same region layout be reproduced in another world?
In the catalog
Terrasect is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 13,894 mods support Minecraft 26.2.
Similar mods
What the author says
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…
Official listing
- Modrinth page
- modrinth.com/mod/terrasect
- Owner
- let-value
- Published
- 2026-07-18
- Updated on Modrinth
- 2026-10-05
- Facts verified
- 2026-10-15