Biome Modifiers

NeoForge adds the ability to add biome modifiers which enables changing biome properties without completely overriding the whole biome definition. WorldJS adds the ability to create the NeoForge provided modifier types via KubeJS’s ServerEvents.registry('neoforge:biome_modifier', event => {...}) event

• Add Features

• Add Cavers

• Add Spawn Costs

• Add Spawns

• None

• Remove Features

• Remove Spawn Costs

• Remove Spawns

• Remove Carvers

Add Features

Type: add_features

See the relevant page on the NeoForge Docs for a detailed explanation of what this modifier does

• .biomes(biomes: HolderSet<Biome>)

  : Set the biome(s) to be modified

• .step(step: GenerationStep$Decoration)

  : Set the decoration step the features will added to
  Reveal/hide list of decoration steps

  • raw_generation
  • lakes
  • local_modifications
  • underground_structures
  • surface_structures
  • strongholds
  • underground_ores
  • underground_decoration
  • fluid_springs
  • vegetal_decoration
  • top_layer_modification

• .features(features: HolderSet<PlacedFeature>)

  : Set the feature(s) to be added to the biome(s)

Example

ServerEvents.registry('neoforge:biome_modifier', event => {
    event.create('add_flowers', 'add_features')
        .biomes('#kubejs:needs_more_flowers')
        .step('vegetal_decoration')
        .features('#kubejs:flower_patches')
})

Add Cavers

Type: add_carvers

See the relevant page on the NeoForge Docs for a detailed explanation of what this modifier does

• .biomes(biomes: HolderSet<Biome>)

  : Set the biome(s) to be modified

• .step(step: GenerationStep$Carving)

  : The carving step to add the carver(s) to
  Reveal/hide list of carving steps

  • air
  • liquid

• .carvers(carvers: HolderSet<ConfiguredWorldCarver<?>>)

  : Set the carver(s) to add to the biome(s)

Example

ServerEvents.registry('neoforge:biome_modifier', event => {
    event.create('add_cave_carvers', 'add_carvers')
        .biomes('#kubejs:needs_more_caves')
        .step('air')
        .carvers('#kubejs:special_cave_carvers')
})

Add Spawn Costs

Type: add_spawn_costs

See the relevant page on the NeoForge Docs for a detailed explanation of what this modifier does

• .biomes(biomes: HolderSet<Biome>)

  : Set the biome(s) to be modified

• .entityTypes(entityTypes: HolderSet<EntityType<?>>)

  : The entity type(s) to add a spawn cost for

• .cost(spawnBudget: number, costPerSpawn: number)

  : Set the cost
  • spawnBudget: number: The total energy budget for spawning entities
  • costPerSpawn: number: The amount of charge each entity takes up from the budget

Example

ServerEvents.registry('neoforge:biome_modifier', event => {
    event.create('add_skeletons', 'add_spawn_costs')
        .biomes('#kubejs:add_skeletons')
        .entityTypes([
            'minecraft:skeleton',
            'minecraft:stray'
        ])
        .cost(12, 0.7)
})

Add Spawns

Type: add_spawns

See the relevant page on the NeoForge Docs for a detailed explanation of what this modifier does

• .biomes(biomes: HolderSet<Biome>)

  : Set the biome(s) to be modified

• .spawns(spawns: List<Spawn>)

  : Set the spawn(s) to add to the biome(s). Accepts a list of Spawn, which can be created as a map of parameters to values
  • entityType: EntityType<?>: The entity type to spawn
  • weight: int: The spawn weight
  • minCount: int: The minimum group size
  • maxCount: int: The maximum group size

Example

ServerEvents.registry('neoforge:biome_modifier', event => {
    event.create('add_zombies', 'add_spawns')
        .biomes('#kubejs:needs_more_zombies')
        .spawns([
            {
                entityType: 'minecraft:zombie',
                weight: 3,
                minCount: 1,
                maxCount: 5
            },
            {
                entityType: 'minecraft:husk',
                weight: 2,
                minCount: 2,
                maxCount: 3
            }
        ])
})

None

Type: none

See the relevant page on the NeoForge Docs for a detailed explanation of what this modifier does

Example

ServerEvents.registry('neoforge:biome_modifier', event => {
    event.create('hexcasting:swamp_geodes', 'none')
        // Overwrite's Hexcasting's swamp geode biome modifier, removing its changes
        // Note: the mod & modifier are provided purely as an example, the combo may not actually exist
})

Remove Features

Type: remove_features

See the relevant page on the NeoForge Docs for a detailed explanation of what this modifier does

• .biomes(biomes: HolderSet<Biome>)

  : Set the biome(s) to be modified

• .features(features: HolderSet<PlacedFeature>)

  : Set the feature(s) to remove from the biome(s)

• .steps(steps: Set<GenerationStep$Decoration>)

  : Set the generation steps to remove the feature(s) from. Leaving empty or not defining will remove the feature(s) from every generation step
  Reveal/hide list of valid decoration steps

  • raw_generation
  • lakes
  • local_modifications
  • underground_structures
  • surface_structures
  • strongholds
  • underground_ores
  • underground_decoration
  • fluid_springs
  • vegetal_decoration
  • top_layer_modification

Example

ServerEvents.registry('neoforge:biome_modifier', event => {
    event.create('remove_lava_lakes', 'remove_features')
        .biomes('#kubejs:no_lava_lakes')
        .features('minecraft:lake_lava')
})

Remove Spawn Costs

Type: remove_spawn_costs

See the relevant page on the NeoForge Docs for a detailed explanation of what this modifier does

• .biomes(biomes: HolderSet<Biome>)

  : Set the biome(s) to be modified

• .entityTypes(entityTypes: HolderSet<EntityType<?>>)

  : The entity(s) to remove spawn costs for

Example

ServerEvents.registry('neoforge:biome_modifier', event => {
    event.create('soul_skeletons', 'remove_spawn_costs')
        .biomes('minecraft:soul_sand_valley')
        .entityTypes('minecraft:skeleton')
})

Remove Spawns

Type: remove_spawns

See the relevant page on the NeoForge Docs for a detailed explanation of what this modifier does

• .biomes(biomes: HolderSet<Biome>)

  : Set the biome(s) to be modified

• .entityTypes(entityTypes: HolderSet<EntityType<?>>)

  : Set the entity(s) to remove spawns for

Example

ServerEvents.registry('neoforge:biome_modifier', event => {
    event.create('no_zombies', 'remove_spawns')
        .biomes('#kubejs:no_zombies')
        .entityTypes('#kubejs:zombies')
})

Remove Carvers

Type: remove_carvers

See the relevant page on the NeoForge Docs for a detailed explanation of what this modifier does

• .biomes(biomes: HolderSet<Biome>)

  : Set the biome(s) to be modified

• .carvers(carvers: HolderSet<ConfiguredWorldCarver<?>>)

  : Sets the carver(s) to be removed from the biome(s)

• .steps(steps: Set<GenerationStep$Carving>)

  : Sets the carving step(s) to remove the carver(s) from
  Reveal/hide list of carving steps

  • air
  • liquid

Example

ServerEvents.registry('neoforge:biome_modifier', event => {
    event.create('remove_carvers', 'remove_carvers')
        .biomes('#kubejs:needs_less_sharp_carvers')
        .carvers('#kubejs:sharp_carvers')
        .steps([
            'air'
        ])
})