Mineuniverse
Mods
Modern Model Format

Modern Model Format

MOD
Allows 1.21.11 models to load in older versions
by Nico_44
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95 downloads
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Updated Oct 14, 2026
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API and Library Utility & QoL
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Allows the use of the 1.21.11 model format in older versions with the help of black magic, specifically allowing all three axis (XYZ) rotation and incrementes larger/smaller than 22.5°, additionally removing the 3x3x3 size constraint.

Example

Showcase of the mod featuring a diamond block with three axis rotation

<details> <summary>Model</summary>

File: assets/minecraft/models/block/diamond_block.json

{
  "format_version": "1.21.11",
  "textures": {
    "all": "block/diamond_block"
  },
  "elements": [
    {
      "from": [0, 0, 0],
      "to": [16, 16, 16],
      "rotation": {"x": 45, "y": 45, "z": 45, "origin": [8, 8, 8]},
      "faces": {
        "north": {"uv": [0, 0, 16, 16], "texture": "#all"},
        "east": {"uv": [0, 0, 16, 16], "texture": "#all"},
        "south": {"uv": [0, 0, 16, 16], "texture": "#all"},
        "west": {"uv": [0, 0, 16, 16], "texture": "#all"},
        "up": {"uv": [0, 0, 16, 16], "texture": "#all"},
        "down": {"uv": [0, 0, 16, 16], "texture": "#all"}
      }
    }
  ]
}

</details>

Supports both rotation types:

All axis rotation

  "rotation": {
    "x": 45,
    "y": 45,
    "z": 45,
    "origin": [
      8,
      8,
      8
    ]
  }

Single axis rotation

  "rotation": {
    "angle": 45,
    "axis": "y",
    "origin": [
      8,
      8,
      8
    ]
  }

Maven

repositories {
  maven { url 'https://jitpack.io' }
}

dependencies {
  modImplementation 'com.github.Nico44YT:ModernModelFormat:<version>'
}

Version generally is comprised of "<mod_version>_<game_version_range>" e.g: "1.3.0-1.19.3-1.21.3"

Issues

If you have found an issue please report it on the github, along with (if applicable):

  • any logs
  • the model
  • a screenshot
  • the game version
  • modlist

My models are not loading anymore

Try checking the model file for any extra brackets {} because Modern Model Format ensure a strict json validation.

Example:

[18:30:32] [Worker-Main-2/ERROR]: Failed to load model mod_id:models/item/example_item.json
com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 506 path $
ModernModelFormat-1.3.0.jar
MC 1.21.2-Snapshot, 1.21, 1.20.2-Snapshot, 1.20.5-Snapshot, Client, 1.21.1-Snapshot, 1.19.3, 1.20.2, 1.19.4, Fabric, 1.19.4-Snapshot, 1.20.5, 1.20.1, 1.20, 1.20.6, 1.20-Snapshot
Release 2026-07-19 Get

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