minecraft-kajetans-mod/src/main/java/me/km/dimensions/CustomWorldProviderSurface.java

package me.km.dimensions;

import net.minecraft.world.WorldProviderSurface;

public class CustomWorldProviderSurface extends WorldProviderSurface
{
    @Override
    public String getSaveFolder() 
    {
        int id = this.getDimension() + 1;
        id = id % 3;
        id--;
        return (id == 0 ? null : "DIM" + id);
    }
}