Item Model Definitions

Item model definitions are available through ItemsAdderAdditions.

Item model definitions are the vanilla resource-pack files (added in Minecraft 1.21.4) that map an item to a model and select between models based on item state. IAA generates these JSON files from a YAML section on your custom item and writes them into the resource pack.

yaml

items:
  my_item:
    item_model_definition:
      model:
        type: model
        model: my_pack:item/my_item

Check the full documentation here.