NeoBiosphere

Each sphere is chosen from a fixed grid, so the layout stays the same across reloads of a world. A sphere picks its own radius, center height and block type from configurable lists, and the choice is deterministic for its grid coordinates. Biomes are sampled with vanilla noise, so different climate zones and terrain styles appear naturally from one sphere to the next. Automatic bridges connect neighboring spheres, which keeps exploration between them smoother.

An optional upper-hemisphere mode turns the spheres into sky islands, a challenge-style layout that keeps vanilla biome sampling behavior. Radius, spacing, center height, bridge behavior and the block lists are all set in the configuration file. The mod works on the server side only, so players join without installing it, and the server owner chooses the settings.

Compatibility is handled through a Biome Modifier noise routing integration. Other mods that change Overworld noise settings or the carver flow can conflict with it, so the authors advise keeping only one primary world-shape mod in a pack. Block IDs in the config must be valid, for example minecraft:glass, and invalid IDs cause the config to fail to load. The source code is public under the GNU General Public License v3.0 only.