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Introduction to Behavior Packs

• Article
• 03/23/2022
• 8 minutes to read

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In this article

Before building your first Add together-On for Minecraft: Bedrock Edition, you lot volition need to create a pack to concord your custom content. There are ii types of packs that a creator can make: resource packs and behavior packs. A beliefs pack is a folder structure that contains files that bulldoze entity behaviors, loot drops, spawn rules, items, recipes, and trade tables. This tutorial covers how behavior packs are created and how to add behaviors to an in-game cow entity to make it ambitious.

In this tutorial, y'all will learn the following:

• That it's possible to change an entity's beliefs in Minecraft: Bedrock Edition.
• How to link a Behavior Pack to a Resource Pack.

Requirements

It'south recommended that the post-obit be completed before start this tutorial.

• Getting Started with Add-on Development
• Introduction To Resource Packs

Building the Behavior Pack

A behavior pack contains files that creators (like you lot!) utilize to add, remove, or alter gameplay behavior of entities inside Minecraft. An entity's behavior file is what makes each entity do certain actions, like how a chicken follows a thespian who'due south holding seeds.

For Minecraft to find and use your beliefs files, y'all have to ready the folders and files in a particular structure. This tutorial volition guide you through creating this folder and file structure.

Create a binder

In this section, you will create a folder called My_BEHAVIOR_Pack. Well, actually you don't accept to call it that. In fact, you can name this folder anything you desire, only the other folders accept to be named exactly like this tutorial says so that Minecraft knows where to expect.

1. Open up your com.mojang binder.
2. Open the development_behavior_packs folder.
3. Within the development_behavior_packs binder, create a new folder and proper name information technology My_BEHAVIOR_Pack.
4. Open the My_BEHAVIOR_Pack folder.

Create the manifest file

To load a beliefs pack into Minecraft, you will need to create a manifest file. The beliefs pack manifest file is similar to the one created for the resource pack, merely it has two additional sections.

• modules: Defines the pack and so that Minecraft knows how to apply information technology to the world. Behavior packs use the data type.
• dependencies - Creates a link between behavior packs and resource packs to add together custom textures and visuals to Minecraft.

1. Create a new document in your My_BEHAVIOR_Pack binder and name it manifest.json.
   1. You lot will demand to alter the file extension from .txt to .json. If your Explorer window does not testify file extensions, yous tin can enable File Name Extensions nether the View tab.
2. Double-click the manifest.json file to open it in a text editor.
3. Copy and paste the post-obit lawmaking into your file.

              {   "format_version": 2,   "header": {     "description": "My assail cow behavior pack Add together-On!",     "name": "My Behavior Pack",     "uuid":"",     "version": [1, 0, 0],     "min_engine_version": [1, 16, 0]   },   "modules":     [       {         "clarification": "My Outset Addition!",           "type": "data",           "uuid": "",           "version": [one, 0, 0]       }     ],   "dependencies": [     {      "uuid":"UUID from the header department of manifest.json in My_RESOURCE_Pack",       "version":[1,0,0]     }  ] }                          

Enter UUIDs

Similar to the resources pack manifest file, you volition need to generate two different UUIDs for the header and module sections of your manifest file. You can become UUIDs from an online generator such as https://www.uuidgenerator.net/.

1. Copy and paste a UUID into the header section. The UUID volition need to exist pasted in the "uuid" field between the quotation ("") marks to exist read correctly.
2. Refresh the webpage to generate a new UUID for utilize in the modules section.
3. Copy and paste the new UUID into the modules section in the "uuid" field between the quotation marks.

Create the dependency

In that location is a 3rd section in the behavior pack'southward manifest.json file called 'dependencies' that is used to create a link between a resource pack and a beliefs pack. This link is created when the UUID located in the header section of the resource pack'south manifest.json file is the same as the UUID in the dependencies section of the behavior pack's manifest.json file. Yous do not demand to accept a resource pack to use a behavior pack, and you do not need to take a behavior pack to use a resource pack. If you do have both, yous tin utilize this solution to link them together so that when yous load a behavior pack into a earth, it automatically loads and activates the linked resource pack.

1. Open up the manifest.json file located in the My_RESOURCE_Pack folder in the development_resource_packs binder.
2. Copy the UUID from the header department of the resource pack manifest.json file.
3. Go to the manifest.json file located in the *My_BEHAVIOR_Pack folder in the development_behavior_packs binder.
4. Paste the UUID into the "uuid" field in the dependencies section. Make sure everything between the quotes matches exactly.
5. Save the beliefs pack manifest.json file.

Create the Entities Folder and Add a Moo-cow

Every entity'south behaviors are defined in its JSON file that lives inside the code that makes Minecraft work. You're going to create a new cow behavior file that Minecraft will apply instead of its usual "vanilla" one.

1. In the My_BEHAVIOR_Pack binder, create a folder and name it entities.
2. Create a text file in the entities folder and proper name information technology cow.json.
3. Copy and paste the following code into your cow.json file. After you salvage the file, you're ready to go!

Notation

This is the unabridged edited cow.json file. Information technology's large because cows do a lot!

              {     "format_version": "1.xvi.0",     "minecraft:entity": {         "clarification": {             "identifier": "minecraft:cow",             "is_spawnable": true,             "is_summonable": true,             "is_experimental": false         },         "component_groups": {             "minecraft:cow_baby": {                 "minecraft:is_baby": {},                 "minecraft:scale": {                     "value": 0.v                 },                 "minecraft:ageable": {                     "duration": 1200,                     "feed_items": "wheat",                     "grow_up": {                         "event": "minecraft:ageable_grow_up",                         "target": "cocky"                     }                 },                 "minecraft:behavior.follow_parent": {                     "priority": 6,                     "speed_multiplier": i.1                 }             },             "minecraft:cow_adult": {                 "minecraft:experience_reward": {                     "on_bred": "Math.Random(ane,7)",                     "on_death": "query.last_hit_by_player ? Math.Random(1,3) : 0"                 },                 "minecraft:boodle": {                     "table": "loot_tables/entities/cow.json"                 },                 "minecraft:behavior.brood": {                     "priority": 3,                     "speed_multiplier": 1.0                 },                 "minecraft:breedable": {                     "require_tame": fake,                     "breed_items": "wheat",                     "breeds_with": {                         "mate_type": "minecraft:cow",                         "baby_type": "minecraft:cow",                         "breed_event": {                             "event": "minecraft:entity_born",                             "target": "baby"                         }                     }                 },                 "minecraft:interact": {                     "interactions": [                         {                             "on_interact": {                                 "filters": {                                     "all_of": [                                         {                                             "test": "is_family",                                             "subject": "other",                                             "value": "player"                                         },                                         {                                             "exam": "has_equipment",                                             "domain": "hand",                                             "subject": "other",                                             "value": "bucket:0"                                         }                                     ]                                 }                             },                             "use_item": true,                             "transform_to_item": "saucepan:ane",                             "play_sounds": "milk",                             "interact_text": "action.interact.milk"                         }                     ]                 }             }         },         "components": {             "minecraft:is_hidden_when_invisible": {},             "minecraft:type_family": {                 "family": [                     "cow",                     "mob"                 ]             },             "minecraft:breathable": {                 "total_supply": 15,                 "suffocate_time": 0             },             "minecraft:navigation.walk": {                 "can_path_over_water": truthful,                 "avoid_water": true,                 "avoid_damage_blocks": true             },             "minecraft:movement.basic": {},             "minecraft:jump.static": {},             "minecraft:can_climb": {},             "minecraft:collision_box": {                 "width": 0.ix,                 "peak": 1.iii             },             "minecraft:nameable": {},             "minecraft:health": {                 "value": 10,                 "max": 10             },             "minecraft:hurt_on_condition": {                 "damage_conditions": [                     {                         "filters": {                             "test": "in_lava",                             "subject": "self",                             "operator": "==",                             "value": truthful                         },                         "cause": "lava",                         "damage_per_tick": 4                     }                 ]             },             "minecraft:movement": {                 "value": 0.25             },             "minecraft:despawn": {                 "despawn_from_distance": {}             },             "minecraft:behavior.float": {                 "priority": 0             },             "minecraft:behavior.panic": {                 "priority": 1,                 "speed_multiplier": 1.25             },             "minecraft:behavior.mount_pathing": {                 "priority": 2,                 "speed_multiplier": 1.v,                 "target_dist": 0.0,                 "track_target": true             },             "minecraft:behavior.breed": {                 "priority": 3,                 "speed_multiplier": 1.0             },             "minecraft:behavior.tempt": {                 "priority": iv,                 "speed_multiplier": 1.25,                 "items": [                     "wheat"                 ]             },             "minecraft:beliefs.follow_parent": {                 "priority": 5,                 "speed_multiplier": i.1             },             "minecraft:behavior.random_stroll": {                 "priority": 6,                 "speed_multiplier": 0.8             },             "minecraft:behavior.look_at_player": {                 "priority": 7,                 "look_distance": half dozen.0,                 "probability": 0.02             },             "minecraft:behavior.random_look_around": {                 "priority": 9             },             "minecraft:leashable": {                 "soft_distance": 4.0,                 "hard_distance": 6.0,                 "max_distance": 10.0             },             "minecraft:balloonable": {},             "minecraft:rideable": {                 "seat_count": ane,                 "family_types": [                     "zombie"                 ],                 "seats": {                     "position": [                         0.0,                         1.105,                         0.0                     ]                 }             },             "minecraft:physics": {},             "minecraft:pushable": {                 "is_pushable": truthful,                 "is_pushable_by_piston": true             },             "minecraft:conditional_bandwidth_optimization": {},             "minecraft:behavior.nearest_attackable_target": {                 "priority": 2,                 "must_see": truthful,                 "reselect_targets": truthful,                 "within_radius": 25.0,                 "entity_types": [                     {                         "filters": {                             "test": "is_family",                             "subject field": "other",                             "value": "player"                         },                         "max_dist": 32                     }                 ]             },             "minecraft:behavior.melee_attack": {                 "priority": 3             },             "minecraft:attack": {                 "harm": 3             }         },         "events": {             "minecraft:entity_spawned": {                 "randomize": [                     {                         "weight": 95,                         "trigger": "minecraft:spawn_adult"                     },                     {                         "weight": 5,                         "add": {                             "component_groups": [                                 "minecraft:cow_baby"                             ]                         }                     }                 ]             },             "minecraft:entity_born": {                 "add": {                     "component_groups": [                         "minecraft:cow_baby"                     ]                 }             },             "minecraft:entity_transformed": {                 "remove": {},                 "add together": {                     "component_groups": [                         "minecraft:cow_adult"                     ]                 }             },             "minecraft:ageable_grow_up": {                 "remove": {                     "component_groups": [                         "minecraft:cow_baby"                     ]                 },                 "add": {                     "component_groups": [                         "minecraft:cow_adult"                     ]                 }             },             "minecraft:spawn_adult": {                 "add together": {                     "component_groups": [                         "minecraft:cow_adult"                     ]                 }             }         }     } }                          

Testing the Pack

Now that the behavior pack has both a manifest file and a cow entity, it is time to launch Minecraft and test your new Add together-On. As stated in the resource pack tutorial, Pack Stacking will piece of work for beliefs packs as well. This means that when content is loaded, vanilla content is loaded offset, followed by whatever Add-Ons. Because all cows are controlled by the cow.json behavior file, all cows that spawn into your world will have the new behavior.

1. Launch Minecraft and select Play.
2. Select Create New Globe.
3. Under Settings, scroll downwardly to the Add together-Ons section.
4. Click on Behavior Packs to see all bachelor packs.
5. Click the MY PACKS drop-down to open it.
6. Select My Beliefs Pack and click Actuate to add together the behavior pack to the world.
7. Click Create to create your world.
8. Go discover a moo-cow.

Troubleshooting

Behavior pack woes? Troubleshooting is a normal part of whatsoever development procedure. Here are some places to begin troubleshooting a behavior pack.

Beliefs Pack Does Non Appear in Minecraft

If your resource pack does not appear in the Add-Ons section, something is wrong with the manifest.json file. Let's start there.

• Are in that location two different UUIDs in the manifest.json header and modules department? Come across the UUID department for more information.
• Have yous turned on file extensions and paths? manifest.json may not be but manifest.json. If your Explorer window does not bear witness file extensions, you lot tin enable File Proper name Extensions under the View tab.
• Double-check JSON curly braces and brackets. JSON linting tools can help.
• If in that location'due south an issue with an agile behavior pack, at that place will be a carmine exclamation point under Behavior Packs in the Add together-Ons section.
  • The behavior pack will have more information. It may alarm a missing dependency, or run diagnostics on other issues.

Beliefs Pack Shows Upwards, Content Doesn't Work

• Cheque that the entities folder is in the right identify, and spelled correctly. Then bank check all spellings of cow.
• Brand sure that the UUID in the dependencies section matches an existing resource pack (and that it's working too).
• Motion your pack above others to ensure your behavior pack is loaded kickoff. Pack stacking may cause your changes to non appear.

What'south Next?

At present that you lot have seen a beliefs pack in action, you lot can learn more about how they work and what else you tin can exercise with them.

To encounter examples of unchanged resources and behavior files, check out the Minecraft Vanilla resources pack and Vanilla behavior Pack.

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Source: https://docs.microsoft.com/en-us/minecraft/creator/documents/behaviorpack