Question Custom world height problem

[DeeChael]

I wanne change the world height by reflecting to modify the DimensionType(reobf: DimensionManager) under Level(reobf: World)
But the tutorials I found are too old, DimensionType is a just a field in the Level class and can easily be modified.
But on higher versions, there is no DimensionType but Holder<DimensionType> in Level class, I tried to modify it with this:

Holder<DimensionType> oldHolder = serverLevel.dimensionTypeRegistration();
Holder.Reference<DimensionType> oldReference = (Holder.Reference<DimensionType>) oldHolder;
DimensionType oldType = serverLevel.dimensionType();
DimensionType newType = new DimensionType(
        oldType.fixedTime(),
        oldType.hasSkyLight(),
        oldType.hasCeiling(),
        oldType.ultraWarm(),
        oldType.natural(),
        oldType.coordinateScale(),
        oldType.bedWorks(),
        oldType.respawnAnchorWorks(),
        -128,
        512 + 128,
        oldType.logicalHeight(),
        oldType.infiniburn(),
        oldType.effectsLocation(),
        oldType.ambientLight(),
        oldType.monsterSettings()
);
for (Field field : Level.class.getDeclaredFields()) { // Use reflect to prevent name not same because of reobf
    if (!field.getType().equals(Holder.class))
        continue;
    ParameterizedType type = (ParameterizedType) field.getGenericType();
    Type[] types = type.getActualTypeArguments();
    if (types.length != 1)
        continue;
    if (types[0] != DimensionType.class)
        continue;
    field.setAccessible(true);
    try {
        Holder.Reference<DimensionType> newReference = null;
        for (Field typeField : Holder.Reference.class.getDeclaredFields()) {
            if (typeField.getType() != HolderOwner.class)
                continue;
            typeField.setAccessible(true);
            newReference = Holder.Reference.createStandAlone((HolderOwner<DimensionType>) typeField.get(oldReference), oldReference.key());
            break;
        }
        if (newReference == null)
            break;
        for (Method method : Holder.Reference.class.getDeclaredMethods()) {
            if (method.getReturnType() == Void.class || method.getReturnType() == void.class) {
                if (method.getParameterCount() == 1) {
                    if (method.getGenericParameterTypes()[0] instanceof TypeVariable<?>) {
                        method.setAccessible(true);
                        method.invoke(newReference, newType);
                        break;
                    }
                }
            }
        }
        field.set(serverLevel, newReference);
        break;
    } catch (IllegalAccessException | InvocationTargetException e) {
        throw new WorldException(e);
    }
}

But I got strange result like this:

 

[Lumine1909]

You can refer to this code

CustomWorldHeight/src/main/java/io/github/lumine1909/WorldListener.java at main · Lumine1909/CustomWorldHeight

Plugin for paper, modify height of world customly. Contribute to Lumine1909/CustomWorldHeight development by creating an account on GitHub.

github.com

(I don't use paperweight because it will make reflection more complicated

I also changed ResourceKey and LightEngine of paper server