ORM - OverrideResourceManager

A client-side Fabric mod for Minecraft 1.21.4 that lets you replace item textures and models at runtime — no resource pack required. Overrides live in plain files under config/orm/ and reload with the resource stack (F3+T).

Features

Installation

1. Install Fabric Loader and Fabric API for Minecraft 1.21.4.
2. Drop the ORM .jar into your mods/ folder.
3. Launch the game — config/orm/ is created automatically.

File Layout

config/orm/
├── overrides.json            ← main config (list of override entries)
├── models/
│   └── <name>.json           ← custom Blockbench/JSON models
└── textures/
    └── item/
        └── <name>.png        ← texture files (+ optional .png.mcmeta for animation)

Models and textures are referenced in overrides.json using the orm: namespace:

• "model": "orm:sword" → config/orm/models/sword.json
• "texture": "orm:item/texture2d/apple" → config/orm/textures/item/texture2d/apple.png

Subdirectories are fully supported and their structure is preserved:

config/orm/textures/item/sword/anim/animation.png
  → orm:item/sword/anim/animation

overrides.json Reference

Each entry is a JSON object. Fields:

At least one of texture or model should be set.

Example Usage

The example below is taken from a real working config. It overrides two tools with custom Diablo-style 3D models (each with an animated texture layer) and replaces the Golden Apple with a flat 2D texture.

config/orm/overrides.json

[
  {
    "item": "minecraft:netherite_sword",
    "name": "Netherite Sword",
    "model": "orm:sword"
  },
  {
    "item": "minecraft:netherite_pickaxe",
    "name": "Netherite Pickaxe",
    "model": "orm:pickaxe"
  },
  {
    "item": "minecraft:golden_apple",
    "name": "Golden Apple",
    "texture": "orm:item/texture2d/apple"
  }
]

File structure for the example above

config/orm/
├── overrides.json
├── models/
│   ├── sword.json
│   └── pickaxe.json
└── textures/
    └── item/
        ├── sword/
        │   ├── diablo_texture.png       ← static base texture
        │   └── anim/
        │       ├── animation.png        ← animated overlay frames
        │       └── animation.png.mcmeta ← frame timing
        ├── pickaxe/
        │   ├── diablo_texture.png
        │   └── anim/
        │       ├── animation.png
        │       └── animation.png.mcmeta
        └── texture2d/
            └── apple.png               ← flat 2D replacement

How each entry works

Netherite Sword / Pickaxe — "model": "orm:sword" loads models/sword.json. The model itself references two texture layers:

• orm:item/sword/diablo_texture — a static 128×128 detailed texture
• orm:item/sword/anim/animation — an animated overlay driven by animation.png.mcmeta

Both are matched by display name ("name": "Netherite Sword") so only items with that exact name are affected. Rename the item in an anvil to anything else and the vanilla model returns.

Golden Apple — "texture": "orm:item/texture2d/apple" replaces the vanilla golden_apple.png globally (no name filter), so every golden apple in the world uses textures/item/texture2d/apple.png.

Animated texture .mcmeta format

{
  "animation": {
    "frametime": 3,
    "frames": [0, 1, 2, 3]
  }
}

Place the .mcmeta file next to the .png with the same name plus .mcmeta suffix.

Keybind: Quick-Add

Open any inventory screen and middle-click an item slot. ORM reads the item's ID, display name, and CustomModelData, appends a new entry to overrides.json, and prints a chat confirmation. The generated entry uses the texture field with a path derived from the item ID — replace the placeholder texture value with your actual file.

Default binding: Middle Mouse Button (rebindable under Controls → Override Resource Manager).

Reloading

Press F3+T to reload resource packs. ORM re-reads overrides.json, rescans models/ and textures/, and rebuilds the override registry without restarting the game.

Requirements

• Minecraft 1.21.4
• Fabric Loader 0.19.2+
• Fabric API 0.119.4+1.21.4