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Forge provides several [[#Builtin_Biome_Modifier_Types|builtin biome modifier types]], so some basic use cases such as adding features or mob spawns to biomes can be done without registering additional serializers.

Forge provides several [[#Builtin_Biome_Modifier_Types|builtin biome modifier types]], so some basic use cases such as adding features or mob spawns to biomes can be done without registering additional serializers.

= Biome Modifier Types =

=Biome Modifier Types=

 

To define a new type of biome modifier, begin by implementing a new class that extends <code>BiomeModifier</code>. BiomeModifiers can usually be implemented as records, to reduce boilerplate.

To define a new type of biome modifier, begin by implementing a new class that extends <code>BiomeModifier</code>. BiomeModifiers can usually be implemented as records, to reduce boilerplate.

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Typically we also want to restrict biome modifiers to only apply to certain biomes. We can do that by accepting a HolderSet<Biome> in our constructor:

Typically we also want to restrict biome modifiers to only apply to certain biomes. We can do that by accepting a HolderSet<biome> in our constructor:

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We can also accept Holders or HolderSets for other [[Registration#Data_Driven_Entries|datapack registry elements]], such as PlacedFeatures, which allows our BiomeModifier to refer to those elements, which can then be defined in their own JSON files.

We can also accept [[Holders]] or [[HolderSets]] for other [[Registration#Data_Driven_Entries|datapack registry elements]], such as PlacedFeatures, which allows our BiomeModifier to refer to those elements, which can then be defined in their own JSON files.

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   }

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= Biome Modifier Serializers =

= Biome Modifier Serializers =