Underground Biomes

What's new

First NeoForge 1.21.1 release, migrated forward from the 1.12.2 line (last released as 1.12-1.3.14).

Notable changes since 1.3.14 — all by LemADEC unless noted:

Port & world generation

• Initial port to NeoForge 1.21.1 (xDrelos)
• Fixed the long-standing strata chunk-transition seams (xDrelos)
• Added automatic chunk re-ubification (ores & strata) when definitions change
• Dimensions are now addressed by string id instead of numeric index (xDrelos)
• Added dripstone support for carbonate stones; removed the Quark speleothem dependency
• Added a duplicate-host-stone warning (e.g. Quark limestone/shale overlapping UB stone)
• Added xDrelos easter egg because they didn't want to be an author :)

Textures

• Refreshed to modern art: cobblestone, sand, gravel, sandstone, clay & suspicious variants
• Added dynamic ore-overlay extraction with a local cache
• Added runtime stone-tinted texture generation, no baked duplicates in the repo
• Added animated-ore texture support
• Added suspicious sand & gravel, and new sandstone variants (cut / smooth)

Ores & mod integration

• Updated integration with the major 1.21.1 ore mods: Actually Additions, Advent of Ascension, Create, DeepResonance, Draconic Evolution, Energized Power, Extreme Reactors, Forestry, Galosphere, GregTechCEu, Immersive Engineering, Mekanism, Modern Industrialization, Mystical Agriculture, NuclearCraft (Neoteric + Neohaul), Occultism, Powah, Quark, Railcraft Reborn, RFTools, Silent's Gems
• Added a dynamic tag learner so UB ore/stone variants inherit their source's tags (the first boot after a change takes a few seconds longer to reload with the fix applied)
• Added a silk-touch option: drop the UB variant or the original ore
• Removed the BYG integration — it no longer ships ore blocks

Tooling & build

• Added /ubtags to audit tag parity on stone variants and ores (server op)
• Added /ubtest to spawn quick showcases of ores and stone variants (server op + creative)
• Added /ubify to force chunk (re)ubification around the player, with a restrata mode to re-apply strata after a config change (server op)
• Migrated the build chain to the Kotlin DSL
• Reviewed and updated the configuration settings

Disclaimer: various LLMs were used during this port.