Meta World Type

Selecting Meta World Type on the world creation screen calls other world types to generate the terrain. The world is split into a grid of regions with a configurable width and length, and each region is picked at random from a weighted list of possible world types and dimension generators. Another generator such as the Twilight Forest or Biomes O' Plenty can therefore own its own areas inside an otherwise ordinary world, so a player walking between regions can move from default terrain into amplified or Twilight Forest areas.

The mod does not generate terrain itself. It defers each chunk to the other generator that owns the region containing its coordinates. The server sets the generator through the Meta World Type server config, and the world type and generator strings are listed in the log when the world loads, with the valid generator names printed last. Vanilla options such as DEFAULT, AMPLIFIED, LARGE BIOMES, FLAT, HELL and END are available as entries alongside mod generators like OWG, ATG, BIOMESOP and the Between Lands and Tropicraft providers.

Each entry in the list has a probability written after an @ sign, and the probabilities should sum to 1. A generator name can be followed by a custom generator string joined with a plus sign, so a list such as [email protected] for OWG+INFDEV paired with [email protected] gives a region a 10 percent chance of a snowy INFDEV type and a 20 percent chance of the regular one. The first entry in the list is used for the world spawn, so a list that should spawn only at the world spawn with no other regions needs that entry placed first.