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MythicHUD's shader operates differently in versions before and after 1.20.5. Because of this, the MythicHUD pack uses the overlays feature to try to adjust compatibility per-version.

This is done in the mythichud-modern overlay; the configuration of which can be seen in the /MythicHUD/built-pack/pack.mcmeta.

Modern Versions

To ensure compatibility with all versions MythicHUD can support, the resource pack must use the overlays configured in /MythicHUD/built-pack/pack.mcmeta:

"overlays": {
    "entries": [
      {
        "formats": {
          "min_inclusive": 32,
          "max_inclusive": 34
        },
        "directory": "mythichud-modern"
      }

This overlay is now looking for new shaders at the root of your resource pack:
Copy the /MythicHUD/built-pack/mythichud-modern/ folder to the top level of your resource pack, next to the assets folder:

🖿resource_pack
| 🖿assets
|  | 🖿minecraft
|  | 🖿mythichud
|
| 🖿mythichud-modern
|  | 🖿assets
|
| 🖹pack.mcmeta  (should include a JSON section about overlays)
| 🖻pack.png

Without this, the pack will not work on versions newer than 1.20.5.

In use-cases where overlays or multi-version support are not possible, the pack may be converted to a single type.

Versions 1.20.6+

To directly make your pack only compatible with versions above 1.20.5, merge this overlay with your pack:

1. Copy /MythicHUD/built-pack/mythichud-modern/assets/minecraft/ folder
2. Paste/merge this folder with your resource pack's /assets/minecraft/ folder.
3. This will migrate the 1.20.5+ shaders to overwrite your generated ones to allow latest-version operation.

Versions below 1.20.5

The pack's default core shaders will operate for versions between 1.19.4 and 1.20.4.
The /MythicHUD/built-pack/mythichud-modern folder is not needed, and can be optionally removed.

and the overlays section of the example pack.mcmeta to your pack. mythichud-modern/ needs to be placed in the root directory of the resource pack (i.e., the same folder as your pack.mcmeta).