Chunksmith

Need help or found a bug? Report it at the Chunksmith support forum.

Chunksmith is a Minecraft chunk pre-generator that generates chunks quickly, efficiently, and safely. On top of fast pre-generation it adds an adaptive I/O throttle (so it keeps generating around the clock even with players online), region write-backpressure protection, and worldgen diagnostics (overreach detection and structure-fault attribution).

Ships as a Fabric + NeoForge mod and a Paper / Spigot / Folia plugin. Originally derived from Chunky by pop4959; now developed independently. Licensed GPL-3.0.

Download: https://modrinth.com/mod/chunksmith Source code: minecraft-1.20-26.3 branch

Why Chunksmith

• Fast. Pre-generates chunks ahead of time so they are ready before players arrive, eliminating the lag of on-demand generation.
• Safe under load. An adaptive throttle watches server tick-health and backs off automatically, so generation can run while players are online without tanking TPS.
• Flexible shapes. Generate by square, circle, diamond, triangle, star, and more - centered on coordinates, world spawn, or the world border, by radius or diameter.
• Multi-world, with live progress, rate, ETA, and an optional boss bar.
• Resumable. Pause, continue, cancel, and continue-on-restart - progress is saved.
• World trimming. Delete chunks outside a selected region.
• Developer API for generation progress and completion events.

Usage

The primary command is /cs (alias /chunksmith); /chunky and /cy are deprecated aliases that redirect to /cs. The mod/plugin is op-gated on servers; on Bukkit it uses the chunksmith.command.* permission namespace (legacy chunky.command.* still works).

Common workflow:

• /cs world <world> - choose the target world (defaults to the current overworld)
• /cs spawn or /cs center <x> <z> - set the generation center
• /cs radius <blocks> - set the radius (or /cs worldborder to use the world border)
• /cs start - begin generating
• /cs pause / /cs continue - pause and resume (progress is saved)
• /cs cancel then /cs confirm - stop and discard the current/saved task

Generation is throttled automatically against server tick-health, so it can run while players are online.

License

GPL-3.0-only. Original Chunky (c) pop4959. Chunksmith modifications (c) Kishku7.