NoStructureOverlap 3.0.0
Prevents different structures from generating inside each other during world generation.
Uses vanilla StructureStart bounding boxes after piece layout (including jigsaw) and before blocks are placed. Same structure type may still overlap; pieces within one structure are never treated as conflicts.
Works with vanilla and modded structures that use the normal NeoForge / Minecraft structure pipeline.
Features
- Accurate bounding boxes — compares real
StructureStartboxes, not guessed sizes or center distances - Different IDs only — blocks overlaps between different structure registry ids (e.g. village vs mansion)
- 3D or 2D checks — full 3D AABB by default; optional X/Z-only mode so underground and surface structures can coexist when their boxes do not meet
- Clean cancel — returns an invalid start before the structure is stored or built
- Per-structure filters — whitelist, blacklist, and per-id enable/disable
- Modpack friendly — tested with large numbers of structure mods
How it works
- Vanilla picks a candidate chunk and runs structure generation
- Pieces are built and the structure’s bounding box is known
- If that box intersects another tracked start with a different registry id, placement is cancelled
- Blocks are only placed later for starts that remain valid
Configuration
File: config/nostructureoverlap-common.toml
| Option | Default | Description |
|---|---|---|
enableOverlapPrevention |
true |
Master switch |
use3DOverlapDetection |
true |
true = full 3D; false = X/Z only |
logBlockedStructures |
true |
Log blocked placements |
structureWhitelist |
[] |
If set, only these ids are checked |
structureBlacklist |
[] |
These ids skip checks |
structureSpecificEnabled |
[] |
Overrides, e.g. ["minecraft:mineshaft=false"] |
Use real registry ids such as minecraft:village_plains.
Commands
/nostructureoverlap status— enabled state, tracked count, detection mode/nostructureoverlap info— detailed status/nostructureoverlap structures— show active filters
Installation
- Install NeoForge for Minecraft 1.21.1
- Download the mod JAR
- Place it in your
modsfolder - Start the game or server
Compatibility
- Minecraft 1.21.1
- NeoForge 21.1.x
- Vanilla and modded structures using
Structure.generate/StructureStart - Does not cover custom worldgen that places blocks without structure starts
Links
No Structure Overlap Team
Owner
