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The mod is OUTDATED but some people make it work

Shared Structures

Generate custom prefab structures in existing biomes/zones using vanilla-style placement patterns.

What it does

Loads structure entries from your asset packs
Places prefabs during world generation using pattern rules (grid/noise/height/parent/masks)
Supports entities and block spawners embedded in prefabs

How to add structuresCreate JSON config files in your pack at:

Server/WorldGen/SharedStructures/Prefabs/*.json

Each file contains an array of entries.

Fields

Id: unique name for the entry
Prefab: prefab asset id(s)
Weight: weights matching the Prefab list
BiomeMask: wildcard match against the biome id
ZoneMask: wildcard match against the zone id
Pattern: either { "File": "A.B.C" } or an inline pattern object

Notes

Patterns are resolved relative to the worldgen data folder. A file reference A.B.C loads A/B/C.json.
Prefabs should be stored under Server/Prefabs/ in your pack.

Example:

[ { "Id": "castlearena", "Prefab": ["YourPack.CastleArena"], "Weight": [1.0], "BiomeMask": ["*Plains*"], "ZoneMask": ["Zone1_Tier1"], "Pattern": { "File": "World.Default.Zones.Pattern_Monuments"} } ]