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https://github.com/NucleoidMC/fantasy

Library to support creating dimensions at runtime
https://github.com/NucleoidMC/fantasy

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Library to support creating dimensions at runtime

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# Fantasy
Fantasy is a library that allows for dimensions to be created and destroyed at runtime on the server.
It supports both temporary dimensions which do not get saved, as well as persistent dimensions which can be safely used across server restarts.

## Using

### Adding to Gradle
To add Fantasy to your Gradle project, add the Nucleoid Maven repository and Fantasy dependency.
`FANTASY_VERSION` should be replaced with the latest version from [Maven](https://maven.nucleoid.xyz/xyz/nucleoid/fantasy).
```gradle
repositories {
maven { url = 'https://maven.nucleoid.xyz/' }
}

dependencies {
// ...
modImplementation 'xyz.nucleoid:fantasy:FANTASY_VERSION'
}
```

### Creating Runtime Dimensions
All access to Fantasy's APIs goes through the `Fantasy` object, which can be acquired given a `MinecraftServer` instance.

```java
Fantasy fantasy = Fantasy.get(server);
// ...
```

All dimensions created with Fantasy must be set up through a `RuntimeWorldConfig`.
This specifies how the dimension should be created, involving a dimension type, seed, chunk generator, and so on.

For example, we could create a config like such:
```java
RuntimeWorldConfig worldConfig = new RuntimeWorldConfig()
.setDimensionType(DimensionTypes.OVERWORLD)
.setDifficulty(Difficulty.HARD)
.setGameRule(GameRules.DO_DAYLIGHT_CYCLE, false)
.setGenerator(server.getOverworld().getChunkManager().getChunkGenerator())
.setSeed(1234L);
```

Values such as difficulty, game rules, and weather can all be configured per-world.

#### Creating a temporary dimension
Once we have a runtime world config, creating a temporary dimension is simple:
```java
RuntimeWorldHandle worldHandle = fantasy.openTemporaryWorld(worldConfig);

// set a block in our created temporary world!
ServerWorld world = worldHandle.asWorld();
world.setBlockState(BlockPos.ORIGIN, Blocks.STONE.getDefaultState());

// we don't need the world anymore, delete it!
worldHandle.delete();
```
Explicit deletion is not strictly required for temporary worlds: they will be automatically cleaned up when the server exits.
However, it is generally a good idea to delete old worlds if they're not in use anymore.

#### Creating a persistent dimension
Persistent dimensions work along very similar lines to temporary dimensions:

```java
RuntimeWorldHandle worldHandle = fantasy.getOrOpenPersistentWorld(new Identifier("foo", "bar"), config);

// set a block in our created persistent world!
ServerWorld world = worldHandle.asWorld();
world.setBlockState(BlockPos.ORIGIN, Blocks.STONE.getDefaultState());
```

The main difference involves the addition of an `Identifier` parameter which much be specified to name your dimension uniquely.

Another **very important note** with persistent dimensions is that `getOrOpenPersistentWorld` must be called to re-initialize
the dimension after a game restart! Fantasy will not restore the dimension by itself- it only makes sure that the world data
sticks around. This means, if you have a custom persistent dimension, you need to keep track of it and all its needed
data such that it can be reconstructed by calling `getOrOpenPersistentWorld` again with the same identifier.