Custom dimension/Generator

The format of the compound is dependent on the value of its generator ID, or.

When the generator ID type is minecraft:noise:
 * Generation settings used for the dimension.
 * (string): The ID of the generator (in this case, minecraft:noise).
 * 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 is based upon this seed and not the world seed.
 * The shape of the terrain. Can be set to a string to use a preset or a compound with a list of customized options. The string values the object can be set to to load default settings include  for normal Overworld generation,  for Amplified Overworld generation,  for regular Nether generation,  for Nether-like generation but with Overworld terrain features,  to generate the main End island, and  for End floating islands generation.
 * The distance from the world height for the top coordinate of the bedrock roof, if out of bounds (0-255) the roof does not appear. e.g. setting this to 32 puts the top of the roof at y=224. If the bedrock roof is low enough, natural terrain still generates above it.
 * The y coordinate of the bedrock floor, similar to bedrock_roof_position – setting both floor and roof to 255 generates a single layer of flat bedrock for each of them.
 * The sea level in this dimension between 0 and 255
 * Can be true or false.
 * Structure settings
 * Settings for how strongholds should be spawned. The stronghold values under the  tag appear to be placeholders so that every namespaced structure has a value; these values are the ones that actually control stronghold spawning.
 * Controls how far apart the strongholds are.
 * How many strongholds to generate.
 * List of structures to use in this dimension
 * The key for this field should be the namespaced ID of a structure, a list is available at . If structures are not listed, the default structures from the dimension specified in biome_source > type spawn at an extremely increased rate in the biomes they naturally spawn in. All structures must be listed for stable generation of non flat world types.
 * (number): Average distance between two structure placement attempts of this type in chunks.
 * (number): Minimum distance between two structures of this type in chunks; must be less than.
 * (integer): A number that assists in randomization; see.
 * Parameters for world generation.
 * Settings for the curve at the top of the world.
 * (integer): The value of the curve. Negative values round off the top of the hills in the affected area, positive values create a roof. Higher values produce larger effects.
 * (integer): Defines the size of the affected area from the top of the world.  is calculated using the formula.
 * (integer): Moves the affected area from the top of the world.  uses the same formula as   so  . For , positive values move the area down and negative values bring it up.
 * Settings for the curve at the bottom of the world.
 * (integer): The value of the curve. Negative values remove the floor and round off the bottom of the islands, positive values make a floor. Higher values produce larger effects.
 * (integer): Defines the size of the affected area from the bottom of the world. Uses the same formula as in.
 * (integer): Moves the affected area from the bottom of the world. Uses the same formula as in . For , positive values move the area up and negative values bring it down.
 * (double): Scales the X and Z axis of the noise. Higher values results in more intricate horizontal shapes. Works similarly to coordinate scale from old customized worlds.
 * (double): Smoothes the noise on the horizontal axis.
 * (double): Scales the Y axis of the noise. Higher values result in more intricate vertical shapes. Works similarly to height scale from old customized worlds.
 * (double): Smoothes the noise on the vertical axis.
 * (integer): Changes the Y scale of the landmass. Values between 1 and 15 gradually increase the hill height, above 20 are all above the normal sea level of 63, and higher than 32 give normal land levels of 100+.
 * (integer): Changes the X/Z scale of the landmass, but not the biomes.
 * (integer): Changes the max height of generated terrain by squashing the world. For example, with height=128, the ground is set to Y=32. this does not affect sea level.
 * (double):
 * (double; values between -1 and 1): Affects the average land level (not sea level).
 * (boolean; optional):
 * (boolean):
 * (boolean; optional): Causes the world to generate like The End with a big island in the center and smaller ones around.
 * (boolean; optional): Toggles between amplified and normal terrain generation. Can be used alongside large biomes in `vanilla_layered` types, and in any dimension (Nether, End, and custom).
 * The block that appears below the top blocks of the world; see
 * ID of the block
 * Block states
 * (string): A block state key and its value.
 * The block used for seas and lakes; see.
 * (string): ID of the block
 * Block states
 * (string): A block state key and its value.
 * Settings dictating which biomes and biome shapes.
 * (integer): 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 is based upon this seed and not the dimension seed.
 * (string): The type of biome generation. Arguments lie in the biome_source compound. Some possible values for include.
 * vanilla_layered: Default and large biome generation used in the overworld.
 * (Boolean): Whether the biomes are large. True for biomes generation in the "Large Biomes" world type.
 * (Boolean): Whether the world was default_1_1.
 * multi_noise: 3D biome generation used in the nether.
 * (string): A preset of the set of biomes to be used, mutually exclusive with the only valid that's currently supported is minecraft:nether.
 * A list of biomes, including their likelihood.
 * A biome and its properties
 * (string): The biome.
 * Represent optimal conditions for where the biome should be placed. These values do not affect the generation of terrain within biomes; they affect where the game will choose to place biomes.
 * (float): Used to place similar biomes near each other.
 * (float): Used to place similar biomes near each other.
 * (float):
 * (float): Used to place similar biomes near each other. This is NOT the same as the temperature value listed on Biome, it does NOT affect rain/snow or the color of leaves and grass.
 * (float): Used to place similar biomes near each other.
 * the_end: Biome generation used in the end with biome minecraft:the_end in the center and other end biomes around.
 * fixed: a single biome.
 * The single biome to generate.
 * checkerboard: A biome generation in which 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 of the squares on an exponential scale.
 * A list of biomes that repeat along the diagonals (can be more than 3).
 * Determines the size of the squares on an exponential scale.

When the generator ID type is minecraft:flat (used for Superflat world generation):
 * Generation settings used for the dimension.
 * (string): The ID of the generator (in this case, minecraft:flat).
 * Superflat settings.
 * Layer settings.
 * A superflat layer. This list is interpreted from top to bottom.
 * The number of blocks in the layer.
 * The block the layer is made of.
 * the single biome of the world
 * (optional): Whether or not to generate lakes. If set to true, then water and lava lakes will generate extremely often even in biomes where lakes don't normally generate. Lava lakes generate surrounded by different types of stone and ores from the overworld.
 * (optional): Whether or not to generate biome-specific decorations like trees, grass, flowers, cacti, etc.
 * Structure settings
 * Settings for how strongholds should be spawned. The stronghold values under the  tag appear to be placeholders so that every namespaced structure has a value; these values are the ones that actually control stronghold spawning.
 * Controls how far apart the strongholds are.
 * How many strongholds to generate.
 * List of structures to use in this dimension
 * The key for this field should be the namespaced ID of a structure, a list is available at . If structures are not listed, it will not be generated, unlike with non-flat worlds.
 * (number): Average distance between two structure placement attempts of this type in chunks.
 * (number): Minimum distance between two structures of this type in chunks; must be less than.
 * (integer): A number that assists in randomization; see.
 * (integer): A number that assists in randomization; see.

When the generator ID type is minecraft:debug (used for Debug world generation):
 * Generation settings used for the dimension.
 * (string): The ID of the generator (in this case, minecraft:debug).