New Models Backport (NMB)

New Models Backport is a utility mod for Minecraft 1.21.1 (NeoForge). It allows map makers and resource pack creators to natively load and render modern JSON models (1.21.11+ format) in version 1.21.1.

It was designed for use in very specific and personal situations. (When you don't want to lug around a massive library with a ton of features just for a single function.) However, it is very simple and convenient for regular users to use.

Key Features

• Modern Format: Support for block and item JSON models from the newest Minecraft versions.
• Arbitrary Rotation: Full support for any rotation angles generated in Blockbench (removes the 22.5° limits).
• Fullbright: Supports the "ignore_light": true property, allowing elements to render at maximum brightness while ignoring shadows and world lighting.

Compatibility & Conflicts

Because NMB functions strictly as a format-handling library, it works seamlessly with most client and server-side modifications, including rendering optimization mods. Currently, no conflicts with other mods have been found.

Example usage

{
  "format_version": "1.21.11", // PLEASE BE SURE TO SPECIFY THE FORMAT OF THE NEW VERSION HERE
  "ignore_light": true, // <--- GLOBAL GLOW (if placed here, the ENTIRE model will glow)
  "texture_size": [32, 32],
  "textures": {
    "texture_name": "texture_dir //minecraft:block/dirt",
    "particle": "texture_dir //minecraft:block/stone"
  },
  "elements": [
    {
      "name": "element_name",
      "ignore_light": true, // <--- LOCAL GLOW (if placed here, ONLY THIS specific element will glow)
      
      "from": ["X1", "Y1", "Z1"],
      "to": ["X2", "Y2", "Z2"],
      
      "rotation": {
        "x": "ROT_X",
        "y": "ROT_Y",
        "z": "ROT_Z",
        "origin": ["ORIGIN_X", "ORIGIN_Y", "ORIGIN_Z"]
      },
      
      "faces": {
        "north": {
          "uv": ["UV1", "UV2", "UV3", "UV4"],
          "texture": "#texture_name"
        }
      }
    }
  ]
}

An example of what the “glow” will look like

Requirements & License

• Minecraft: 1.21.1
• NeoForge: 21.1.200 or newer
• License: MIT