RegionIO/internal/worldgen/data/structure_json/ancient_city.json
Daniar Mannanov c488ce274f worldgen: parse structure sets and place them on the vanilla grid
Loads the 26.1.2 structure datapack: 20 structure sets, 34 structure
definitions, and the worldgen biome tags they reference. Random-spread
placement follows RandomSpreadStructurePlacement byte for byte — region
floorDiv by spacing, one Legacy stream salted per region, two
spread-type draws for the offset — and the four legacy frequency
reducers keep their exact draws, including the hardcoded buried-treasure
salt and the outpost's discarded full-range int.

Verified against the fixture: on seed 12345 the ruined_portals set
claims exactly chunk (1,0), the chunk whose captured blocks carry the
ruined portal's obsidian, gold, and crying obsidian. TestStructure-
PlacementGrid pins that plus village separation invariants.
2026-08-26 10:33:10 +03:00

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JSON

{
"type": "minecraft:jigsaw",
"biomes": "#minecraft:has_structure/ancient_city",
"max_distance_from_center": 116,
"size": 7,
"spawn_overrides": {
"ambient": {
"bounding_box": "full",
"spawns": []
},
"axolotls": {
"bounding_box": "full",
"spawns": []
},
"creature": {
"bounding_box": "full",
"spawns": []
},
"misc": {
"bounding_box": "full",
"spawns": []
},
"monster": {
"bounding_box": "full",
"spawns": []
},
"underground_water_creature": {
"bounding_box": "full",
"spawns": []
},
"water_ambient": {
"bounding_box": "full",
"spawns": []
},
"water_creature": {
"bounding_box": "full",
"spawns": []
}
},
"start_height": {
"absolute": -27
},
"start_jigsaw_name": "minecraft:city_anchor",
"start_pool": "minecraft:ancient_city/city_center",
"step": "underground_decoration",
"terrain_adaptation": "beard_box",
"use_expansion_hack": false
}