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Always Plains Spawn

A Minecraft mod (Fabric / Forge / NeoForge) that relocates the world spawn into a Plains biome suited for industrial play — flat land, optional nearby water and forest.

Maintained by MisoPy.

Design assumptions

APS is built around vanilla overworld terrain generation.
Default config values assume vanilla biome layout and height shapes, and are tuned for industrial / factory-style starts:

• Flat plains (surface height and local flatness filters)
• Water (river / ocean / beach) within a short travel distance
• Forest nearby for early wood

With those defaults, a new world should feel like a practical industrial spawn rather than a biome-gacha roll.

Terrain-generation mods

Mods that heavily change terrain or biomes (custom worldgen, large biome overhauls, exotic heightmaps, etc.) often clash with these assumptions. Spawn search may become slow, fail, or pick awkward sites.

config/alwaysplainsspawn-common.toml can soften some mismatches (relax flatness, drop water/forest requirements, raise max_surface_y, widen search). That only helps when the world still has recognizable plains-like areas. Forced use alongside deep worldgen overhauls is not recommended.

How it works

After the overworld is created/loaded (once per world), the mod searches for minecraft:plains using biome noise only (no chunk generation during search), then sets the world spawn.

Focus points:

• Noise-only search — avoids generating chunks while hunting for plains (fast world create / first join)
• Interior plains samples — reduces landing on thin plains strips or forest edges
• Industrial site filters — estimated surface Y, sparse flatness ring (rejects steep river cuts), optional nearby water & forest
• Spawn chunks left to vanilla — only the spawn coordinate is set; no custom forceload (compatible with removers such as Ksyxis)

Performance-minded details (quality kept close to the strict checks):

• Flatness uses a sparse sample (cardinals / diagonals at radius & half-radius), not a dense height grid
• Biome tags use sea-level noise Y instead of calling getBaseHeight on every query
• Water + forest share one nearby spiral (one noise sample per column)
• Winning candidate is not fully re-validated when placing the final Y

Bed / respawn-anchor spawns are unchanged. Without those, players use the plains world spawn.

A per-world marker (alwaysplainsspawn_relocated) prevents re-running after success.

Config

Path: config/alwaysplainsspawn-common.toml (created on first launch)

Biome is fixed to Plains; site filters above are configurable. Defaults target vanilla terrain + industrial convenience.

Compatibility

• Intended for vanilla-like overworld generation (see above)
• Server-side logic (client optional for singleplayer)
• Mixins on vanilla server load / respawn paths
• Nearby patch versions share one jar (publish.additionalVersions)

Requirements

• Minecraft 1.16.5 ~ 26.1.2 (Fabric / Forge / NeoForge — see matrix)
• Architectury API (all loaders)
• Fabric API on Fabric only

Version matrix (compile targets)

Notes:

• Forge 1.16.5 is not supported by the current LegacyForge toolchain
• NeoForge covers 1.20.2+ (via 1.20.4+ targets + additional versions)

License

MIT