There are only three dimensions in Minecraft, and adding a custom one can make a mod very interesting and large. However, for a dimension, you need a lot of code.
The mod class code required for a custom dimension should look like this:
public static int dimension = 5;DimensionManager.registerProviderType(dimension, WorldProviderExample.class, false);DimensionManager.registerDimension(dimension, dimension);
It is suggested to make the dimension ID configurable for compatibility with other mods.
WorldProvider contains several important settings for your dimension. Mainly, it sets the
WorldChunkManager, which is a class that mostly handles biomes. In this case, ...