Step 1: Setting the Model Display

The first thing you want to do is to setup your furnitures display via item frame. To do this, you can open the model in blockbench and go to the display tab (top right) and select the item frame display.

In this display you can adjust the values to your liking or based on your models proportions. You can attempt to copy the settings of the below image, but it is unlikely these values will match your furniture exactly.

Step 2: Adding Your Model

Once your model and the display values are all good to go, you can add it to your pack. First you'll need to export your model; to do so, go to File > Export > Export Block/Item Model, and save your model's json and png somewhere convenient.

Now you need to implement the model's json and png into your pack. In this example below we are using a very simple namespace, however, feel free to implement these however you'd like. Simply add the json into the models directory and the png into the textures directory. A full guide on implementing custom items can be found on the Custom Items guide page.

📁assets
 └── 📁minecraft
            └── 📁models
                       └── 📁custom
                                 └── 📑wooden_chair.json

📁assets
 └── 📁minecraft
            └── 📁textures
                       └── 📁custom
                                 └── 📑wooden_chair.png

And then as usual when adding custom items, create a new predicate under any base item of your choice.

{
     "parent":"item/generated",
     "textures":{
          "layer0":"item/paper"
     },
     "overrides":[{
          "predicate":{
               "custom_model_data": 1 }, "model":"custom/wooden_chair"
          }]
}

Step 3: Using the Model In-Game

If you require a hitbox, light source, seats, or any unique functionality you will need to use MythicCrucible; skip to step 4 instead.

To place your furniture model as-is, you will need invisible item frames. Use the commands below to get an item frame and your custom model. Place down the item frame and pop your model into it!

/give @p item_frame{EntityTag:{Invisible:1b}}

/give @p paper{CustomModelData:1}

Step 4: MythicCrucible (Optional)

MythicCrucible offers many furniture related features such as seats, hitboxes, and light sources. To get started, make sure you have the plugins MythicCrucible and MythicMobs .

You will need to create a new YML file for your item inside of MythicMobs, the simplest place is any new file inside the MythicMobs/Items folder. You can use the following template below for each furniture model you want to have. Make sure you change the material and custom model data value to match what you setup in your model predicate (see step 3).

The values for barriers, seats, and lights are x,y,z oriented. The fourth value for the lights is the light intensity, and only seats can be adjusted at the decimal level.

wood_chair:
  Id: PAPER
  Model: 1
  Display: 'Wood Chair'
  Type: FURNITURE
  Furniture:
    Material: PAPER
    Model: 1
    Drops:
    - wood_chair
    Barriers:
    - 0,0,0
    Seats:
    - 0,0,0
    Lights:
    - 0,0,0 15
  FurnitureSkills:
  - sound{s=entity.chicken.egg} @self ~onBlockPlace
  - sound{s=entity.zombie.attack_wooden_door} @self ~onBlockBreak
  - sound{s=entity.zombie.attack_wooden_door} @self ~onDamaged

You furniture model is now a MythicCrucible item, you can obtain the item via /mm i get <furniture_name>