Large Structure Lib
by rebbystuff
Large Structure Lib is a NeoForge library for placing jigsaw structures that span a much larger radius than the vanilla format allows.
What it does
The library adds large structures, including enormous jigsaw structures, and a grid-based placement method that sets where each structure begins. Structure sets built with it place structures per chunk, which keeps generation stable for large pieces. Any structure set that skips per-chunk placement can produce broken results, so the grid method is recommended for those jigsaws. The format mostly follows standard jigsaw structure files, and the Minecraft wiki examples apply.
Only the server needs the library, so players join without installing anything. It is released under the MIT License and is open source, and its source code and issue tracker are public. Files exist for 1.21.1 on NeoForge, the latest being 1.0.2, published on 2026-09-27 after a first release on 2026-07-15.
Key features
Large jigsaw structures
Modified jigsaw structures span a large radius, including enormous structures beyond the standard size.
Grid structure placement
A grid method sets where each structure generates, placing structures per chunk within a structure set.
Standard jigsaw format
Structure files mostly follow the usual jigsaw layout, so existing examples from the Minecraft wiki can serve as a guide.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Astruct is server-side only, open source under the MIT License, and published for NeoForge 1.21.1. Physical_structures API is client and server, under the MIT License, but not open source, also for 1.21.1. Structure Configurator is server-side only, open source under the MIT License, and built for 1.21.1 on NeoForge.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Large Structure Lib | NeoForge | 1.21.1 | Server-side only | 2026-09-27 |
| Astruct | NeoForge | 1.21.1 | Server-side only | 2026-01-11 |
| Physical_structures API | NeoForge | 1.21.1 | Client and server | 2026-07-01 |
| Structure Configurator | NeoForge | 1.21.1 | Server-side only | 2026-06-03 |
Questions
Does Large Structure Lib need to be installed on the client?
In the catalog
Large Structure Lib is one of 3,514 Library mods on ModsFinder, and one of 1,449 Library mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
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What the author says
Modified Jigsaw structures that can span a large radius. Formed by pregenerating the structure & placing it per chunk. Relies on a Grid Structure Placement structure set in order to generate. Any other structure set that doesn't generate per chunk will result in a broken structure Mostly follows standard jigsaw…
Official listing
- Modrinth page
- modrinth.com/mod/largestructlib
- Owner
- rebbystuff
- Published
- 2026-07-15
- Updated on Modrinth
- 2026-09-27
- Facts verified
- 2026-10-15