Item Behaviours

Item behaviours define specific functionalities associated with items, blocks, and decorations.

All behaviours are optional, and some are mutually exclusive (e.g., trap, shoot, and instrument).

Example with some behaviours set:

Click to expand

Example

{
  "id": "mynamespace:multi_example",
  "vanillaItem": "minecraft:paper",
  "itemResource": {
    "models": {
      "default": "mynamespace:custom/misc/clown_horn",
      "trapped": "mynamespace:custom/misc/clown_horn_trapped"
    }
  },
  "behaviour": {
    "instrument": {
      "sound": "mynamespace:misc.honk",
      "range": 64,
      "useDuration": 60
    },
    "shoot": {
      "consumes": false,
      "baseDamage": 2.0,
      "speed": 1.0,
      "projectile": "minecraft:iron_axe",
      "sound": "mynamespace:misc.shoot"
    },
    "armor": {
      "slot": "head",
      "texture": "mynamespace:texture_name"
    },
    "trap": {
      "types": ["minecraft:villager", "minecraft:zombie", "minecraft:skeleton"],
      "requiredEffects": ["minecraft:glowing"],
      "chance": 75,
      "useDuration": 0
    },
    "fuel": {
      "value": 10
    },
    "food": {
      "hunger": 2,
      "saturation": 1.0,
      "canAlwaysEat": true,
      "fastfood": true
    },
    "cosmetic": {
      "slot": "head",
      "model": "mynamespace:custom/models/clown_backpack_animated",
      "autoplay": "idle",
      "scale": [1.5, 1.5, 1.5],
      "translation": [0.0, 0.5, 0.0]
    },
    "execute": {
      "consumes": true,
      "command": "/summon minecraft:creeper ~ ~ ~ {powered:1b}",
      "sound": "minecraft:block.anvil.place"
    }
  }
}

`armor` behaviour

Defines armour item behaviours, using the Fancypants shader via Polymer.

Tip

As of filament 0.7 it is possible to use armor trims to render custom armor, to enable this, set the trim flag to true.

For Shader-Based Armor

The textures for the shader version of armor should be located in assets/minecraft/textures/models/armor/.
For a texture field value of mynamespace:amethyst, the textures should be named amethyst_layer_1.png and amethyst_layer_2.png.
It's required to use a leather armor item for your vanillaItem for the shader to work.

For Trim-Based Armor

When using Armor Trims for the armor, the textures need to be located in assets/minecraft/textures/trims/models/armor/.
For a texture field value of mynamespace:amethyst, the textures should be named amethyst.png and amethyst_leggings.png.
It's required to use an armor item for your vanillaItem. Any armor item should work.
Depending on the vanillaItem of your custom item, you might be able to see parts of the original armors texture, to mitigate this, you will have to enable the trimArmorReplaceChainmail option in the mods configs.
Enabling trimArmorReplaceChainmail will prevent all chainmail armor pieces unable to receive or display armor trims. The Smithing Table will also reject chainmail armor with this option enabled.

Configurable Fields

slot: The equipment slot for the armour piece (e.g., head, chest, legs, or feet).
texture: The resource location of the texture associated with the armour. Example: mynamespace:amethyst
trim: Flag whether to use trim-based armor instead of shaders

`compostable` behaviour

Makes the item usable in composters.

Configurable Fields

chance: Chance of raising the composter level by 1 between 0 and 100
villagerInteraction: Allows farmer villagers to compost the item. Defaults to true

`cosmetic` behaviour

Defines cosmetic item behaviour for either the head or chestplate slot, supporting both Blockbench models for chestplates and simple item models for either slot.

Configurable Fields

slot: The equipment slot for the cosmetic (head or chest).
model: Optional, the resource location of the animated blockbench or animated-java model for the cosmetic.
autoplay: Optional, the name of the animation to autoplay, which should be loopable.
scale: Scale of the chest cosmetic, defaulting to (1, 1, 1).
translation: Translation of the chest cosmetic, defaulting to (0, 0, 0).

`execute` behaviour

Executes a command on item use with the player as source, located at the player.

Configurable Fields

consumes: Flag whether the item is consumed after running the command(s). Defaults to false
command: The command string to execute. Empty by default
commands: List of commands to execute. Empty by default
sound: Optional sound effect to play during execution. Empty by default

`food` behaviour

Defines food item behaviour for edible items.

Configurable Fields

hunger: The amount of hunger restored when consumed. Defaults to 1
saturation: The saturation modifier provided by the food. Defaults to 0.6
canAlwaysEat: Indicates whether the item can be eaten when the hunger bar is full. Defaults to false
fastfood: Boolean indicating whether the food item is considered fast food (eats faster than normal). Defaults to false

`villager_food` behaviour

Makes the item edible for villagers (for villager breeding).

Configurable Fields

value: The amount of "breeding power" the item has (1 = normal food item, 4 = bread). Defaults to 1

`fuel` behaviour

Defines fuel behaviour for items, specifying their value used in furnaces and similar item-burning blocks.

Configurable Fields

value: The value associated with the fuel, determining burn duration. Defaults to 10

`hoe` behaviour

Gives the item the ability to till farmland, like vanilla hoes do, using 1 durability.

Configurable Fields

sound: Sound to play. Default to the vanilla hoe tilling sound minecraft:item.hoe.till

`shovel` behaviour

Gives the item the ability to change blocks to path blocks, like vanilla shovels do, using 1 durability.

Configurable Fields

sound: Sound to play. Default to the vanilla shovel sound

`shears` behaviour

Gives the item the ability to shears blocks & plants, like vanilla shears do, using 1 durability.

Configurable Fields

sound: Sound to play. Default to the vanilla plant shearing sound

`instrument` behaviour

Defines instrument behaviour for items, similar to goat horns.

Configurable Fields

sound: The sound associated with the instrument. Empty by default
range: The range of the instrument. Defaults to 0
useDuration: Delay in ticks for using the instrument. Defaults to 0

`stripper` behaviour

Gives the item the ability to strip Logs/scrape copper blocks, like an axe. Uses 1 durability.

Fields:

sound: Sound to play. Default to the vanilla axe strip sound

`trap` behaviour

Defines trap behaviour for items capable of trapping specific entity types.

Configurable Fields

types: List of allowed entity types to trap. Example: ["minecraft:silverfish", "minecraft:spider"]
requiredEffects: List of required effects for the trap. Example: ["minecraft:weakness"]
chance: Chance of the trap triggering (0-100). Defaults to 50
useDuration: Use cooldown for the trap item. Defaults to 0

`banner_pattern` behaviour

Allows you to assign a banner pattern to an item for use in Looms.

See the mynamespace:bannertestitem item config in the example datapack in the GitHub repo.

Configurable Fields

id: The id of your banner_pattern in your datapack. Empty by default

Vanilla-like bow behaviour. Lets you specify which item can be shot, but anything that is not an arrow or firework rocket will render as normal arrow. Allows to specify a power multiplier for shooting power. Supports firework rockets.

Warning

Make sure to use minecraft:bow as vanillaItem in order for the item model overrides to work properly!

Configurable Fields

powerMultiplier: The power multiplier. Defaults to 3
supportedProjectiles: List of supported items in the inventory for use with the bow. Defaults to ["minecraft:arrow", "minecraft:spectral_arrow"]
supportedHeldProjectiles: List of supported items for use when in main/offhand. Defaults to ["minecraft:arrow", "minecraft:spectral_arrow", "minecraft:firework_rocket"]
shootSound: The sound when shooting a projectile. Default to minecraft:entity.arrow.shoot

This behaviour can automatically generate the item model predicate overrides for bows (item assets in `items` in 1.21.4).

In order to automatically generate an item model for bows, you have to provide models for default, pulling_0, pulling_1 and pulling_2 in the itemResource field:

Example

{
  "itemResource":  {
    "models": {
      "default": "minecraft:custom/bow/custombow",
      "pulling_0": "minecraft:custom/bow/custombow_pulling_0",
      "pulling_1": "minecraft:custom/bow/custombow_pulling_1",
      "pulling_2": "minecraft:custom/bow/custombow_pulling_2"
    }
  }
}

Alternatively, you can use the itemModel field to provide your own item asset model

`crossbow` behaviour

Vanilla-like crossbow behaviour. Lets you specify which item can be shot, but anything that is not an arrow or firework rocket will render as normal arrow. Allows to specify a power multiplier for shooting power.

Warning

Make sure to use minecraft:crossbow as vanillaItem in order for the item model overrides to work properly!

This behaviour can automatically generate the item model predicate overrides for crossbows (item assets in items in 1.21.4).

In order to automatically generate an item model for crossbows, you have to provide models for default, pulling_0, pulling_1, pulling_2, arrow and rocket in the itemResource field:

Example

{
  "itemResource": {
    "models": {
      "default": "minecraft:custom/crossbow/crossy1", // model without projectile
      "pulling_0": "minecraft:custom/crossbow/crossy1_pulling_0",
      "pulling_1": "minecraft:custom/crossbow/crossy1_pulling_1",
      "pulling_2": "minecraft:custom/crossbow/crossy1_pulling_2",
      "arrow": "minecraft:custom/crossbow/crossy1_arrow", // model with projectile
      "rocket": "minecraft:custom/crossbow/crossy1_rocket" // model with projectile
    }
  }
}

Alternatively, you can use the itemModel field to provide your own item asset model.

Configurable Fields

powerMultiplier: The power multiplier. Defaults to 1
supportedProjectiles: List of supported items in the inventory for use with the crossbow. Defaults to ["minecraft:arrow", "minecraft:spectral_arrow"]
supportedHeldProjectiles: List of supported items for use when in main/offhand. Defaults to ["minecraft:arrow", "minecraft:spectral_arrow", "minecraft:firework_rocket"]
shootSound: The sound when shooting a projectile. Default to minecraft:item.crossbow.shoot
loadingStartSound: Projectile loading start sound. Default to minecraft:item.crossbow.loading_start
loadingMiddleSound: Projectile loading middle sound. Default to minecraft:item.crossbow.loading_middle
loadingEndSound: Projectile loading end sound. Default to minecraft:item.crossbow.loading_end

`shoot` behaviour

Defines behaviour for items capable of shooting custom projectiles or being shot themselves.

Warning

This behaviour is deprecated. Use bow, crossbow or trident

Configurable Fields

consumes: Indicates whether shooting consumes the item. Defaults to false
baseDamage: The base damage of the projectile. Defaults to 2.0
speed: The speed at which the projectile is fired. Defaults to 1.0
projectile: The identifier for the projectile item. Empty by default
sound: Optional sound effect to play when shooting. Empty by default
translation: Translation offset for the projectile. Defaults to [0 0 0]
rotation: Rotation for the projectile. Defaults to [0 90 0]
scale: Scale for the projectile. Defaults to 0.6

`shield` behaviour

Makes the item usable as shield.

This behaviour can automatically generate the item model predicate overrides for shields (item assets in items in 1.21.4).

In order to automatically generate an item model for shields, you have to provide models for default and blocking in the itemResource field:

Example

{
  "itemResource": {
    "models": {
      "default": "minecraft:custom/shield/shield1",
      "blocking": "minecraft:custom/shield/shield1_blocking"
    }
  }
}

Alternatively, you can use the itemModel field to provide your own item asset model

`fishing_rod` behaviour

Makes the item behave like a fishing rod!

This behaviour can automatically generate the item model predicate overrides for fishing rods (item assets in items in 1.21.4).

In order to automatically generate an item model for fishing rods, you have to provide models for default and cast in the itemResource field:

Example

{
  "itemResource": {
    "models": {
      "default": "minecraft:custom/rod/fire_rod",
      "cast": "minecraft:custom/rod/fire_rod_cast"
    }
  }
}

Alternatively, you can use the itemModel field to provide your own item asset model

`trident` behaviour

Warning

This behaviour is experimental and only supported in minecraft 1.21.4 or later

Makes the item behave like a trident!

This behaviour can automatically generate the item model predicate overrides for tridents.

In order to automatically generate an item model for tridents, you will have to provide models for default and cast in the itemResource field:

Example

{
  "itemResource": {
    "models": {
      "default": "minecraft:custom/trident/nether_trident",
      "throwing": "minecraft:custom/trident/nether_trident_throwing"
    }
  }
}

Alternatively, you can use the itemModel field to provide your own item asset model

`mace` behaviour

Makes the item behave like a mace!

Configurable Fields

damageMultiplier: Damage multiplier when "smashing" an entity. Defaults to 1.0

Example

{
  "behaviour": {
    "mace": {
      "damageMultiplier": 1.0
    }
  }
}

`enchantable` behaviour

Backport of the minecraft:enchantable component introduced in 1.21.2, only available for 1.21.1.

Configurable Fields

value: Enchantability value. Defaults to 1

Example

{
  "behaviour": {
    "enchantable": {
      "value": 1
    }
  }
}

`repairable` behaviour

Backport of the minecraft:repairable component introduced in 1.21.2, only available for 1.21.1.

Configurable Fields

items: List of items and or item-tags

Example

{
  "behaviour": {
    "repairable": {
      "items": ["minecraft:honeycomb", "#minecraft:candles"]
    }
  }
}

Filament Documentation (0.15)

Item Behaviours

`armor` behaviour

`compostable` behaviour

`cosmetic` behaviour

`execute` behaviour

`food` behaviour

`villager_food` behaviour

`fuel` behaviour

`hoe` behaviour

`shovel` behaviour

`shears` behaviour

`instrument` behaviour

`stripper` behaviour

Fields:

`trap` behaviour

`banner_pattern` behaviour

`bow` behaviour

`crossbow` behaviour

`shoot` behaviour

`shield` behaviour

`fishing_rod` behaviour

`trident` behaviour

`mace` behaviour

`enchantable` behaviour

`repairable` behaviour