Custom



Customized is a world type that replaced the normal varied terrain of the Overworld with custom features. It can be edited via JSON files.

Access
Custom world generation works using JSON files, these need to be imported, this must be done before world creation.

In the world creation menu, go to more options and select Import World option. Then, select a world generation JSON file. A screen will pop up, warning users that custom worlds are experimental. Click YES to continue. Now, when all is set, don't forget to Allow Cheats and Start World Generation.

Currently, the only way to access added dimensions is through commands, such as, which will teleport the player to the specified dimension (see JSON Format). In the demo file, the dimension is minecraft:use_teleport_command.

JSON Format
Custom Generation Files follow this format:


 * The root tag.
 * Can be true or false. Whether the world has a bonus chest or not (equivalent to bonus chest option).
 * : Can be true or false. Whether structures should be generated or not (equivalent to generate structures option).
 * : The numerical seed of the world.
 * : A list of the dimensions in this world where the key is the namespace id of the dimension. The dimensions minecraft:overworld, minecraft:the_nether and minecraft:the_end are required for a well functioning world, any other namespace id is allowed for custom dimensions.
 * This can be a list of options for the dimensions OR the namespace id of one of the default dimensions as a string, the dimensions will the use the settings of the specified dimension.
 * Can be true or false. Whether the dimensions behaves like the nether (water evaporates and sponges dry) or not (needs testing).
 * : Can be true or false. needs testing.
 * : Can be true or false. Determines whether the dimension is treated as eight meters per block like in the Nether (may need testing).
 * : Can be true or false. Whether the dimension has skylight access or not.
 * : Can be true or false. Whether the dimension has a bedrock ceiling or not.
 * : How much light the dimension has, default is 0.5 in the demo file (needs testing for upper and lower bounds as well as precise effect).
 * : Can be false or any integer in 0-24000. If this is set to a number, the time of the day will always be the specified value (needs testing).
 * Generation settings used for that dimension.
 * The ID of the generator.
 * Other parts of the condition, specified below.
 * The possible values for and associated extra contents:
 * noise - Default generator settings. Used in minecraft:overworld with the World Type option when creating a new world set to Default, minecraft:the_nether and minecraft:the_end.
 * The seed used to generate the dimension. In most cases, this is exactly the same as the world seed, but can be different and the dimension generated will be based upon this seed and not the world seed (needs testing).
 * The shape of the terrain. Can be minecraft:overworld, minecraft:nether, or minecraft:end (potentially incomplete list).
 * Settings dictating which biomes and biome shapes.
 * The seed used for biome generation. In most cases, this is exactly the same as the dimension seed (and by extension the world seed), but can be different and the biome generation for this dimension will be based upon this seed and not the dimension seed (needs testing).
 * The type of biome generation. Arguments lie in the biome_source compound.
 * vanilla_layered Biome generation used in the overworld.
 * Whether the biomes are large. True for the World Type Large Biomes.
 * multi_noise 3D biome generation used in the nether (needs testing).
 * The set of biomes to be used.
 * the_end biome generation used in the end with biome minecraft:the_end in the center and other end biomes around (needs testing).
 * fixed a single biome.
 * The single biome to generate.
 * checkerboard a biome generation where biomes are square (or close to square) and repeat along the diagonals.
 * A list of biomes that repeat along the diagonals (can be more than 3).
 * Determines the size if the squares on an exponential scale.

THIS IS A WORK IN PROGRESS THIS COULD BE OBSOLETE IN VERSIONS AFTER 20w21a