Basically the title. I'd like to create another overworld and add it as a custom dimension in my world. Is that is possible, how would one go about doing that, or where might a guide or video or something to help be located?

I've tried adding a dimension via datapack, but the ability to define a separate seed for other dimensions was apparently removed some time ago. I've also looked at other dimension mods like multiverse, but they are all stuck in older versions of MC or still pull the save's main seed to generate the world.

P.S.
Code I used in the datapack (It still used the default overall seed and not the specified one, it was a carbon copy of the main overworld):

{        
  "type": "minecraft:overworld",
  "generator": {
	"biome_source": {
	  "preset": "minecraft:overworld",
	  "type": "minecraft:multi_noise"
	},
	"seed": 6487992,
	"settings": "minecraft:overworld",
	"type": "minecraft:noise"
  }
}

 

15 hours ago, LogicSequence said:

Basically the title. I'd like to create another overworld and add it as a custom dimension in my world. Is that is possible, how would one go about doing that, or where might a guide or video or something to help be located?

Use the same exact properties as the overworld stuff for the dimension files.

15 hours ago, LogicSequence said:

I've tried adding a dimension via datapack, but the ability to define a separate seed for other dimensions was apparently removed some time ago. I've also looked at other dimension mods like multiverse, but they are all stuck in older versions of MC or still pull the save's main seed to generate the world.

Yes, I believe that feature was removed.

forgot to quote, blah.

Edited February 15, 20232 yr by LogicSequence
reposted

10 hours ago, ChampionAsh5357 said:

Use the same exact properties as the overworld stuff for the dimension files.

Yes, I believe that feature was removed.

Right, i can add another overworld dimension, an exact copy of the overworld using the same seed, but i'd like to have an overworld with a different seed, or to copy the overworld from another save. Basically, is there a way around forcing the game to use the same seed as the primary overworld when it generates the second overworld dimension? Edit this or that file, replace these files, anything?

The best I can think of is to not use the overworld type and remake the overworld with its biomes in a custom minecraft:noise generator.

18 hours ago, ChampionAsh5357 said:

The best I can think of is to not use the overworld type and remake the overworld with its biomes in a custom minecraft:noise generator.

Would that force it to use a different seed when it generated the world though? Even if i copy all the biomes and settings perfectly, if it doesn't use a different seed to generate the terrain the actual map will be the same, right?

4 hours ago, LogicSequence said:

Would that force it to use a different seed when it generated the world though? Even if i copy all the biomes and settings perfectly, if it doesn't use a different seed to generate the terrain the actual map will be the same, right?

Technically since it's a different generator, it should handle the random slightly differently such that the results are not exactly the same as the overworld. You could always try to verify it though.

19 hours ago, ChampionAsh5357 said:

Technically since it's a different generator, it should handle the random slightly differently such that the results are not exactly the same as the overworld. You could always try to verify it though.

Ok, but would it work with a SPECIFIC different seed, i'm not trying for a random seed, i'm trying for a different yet specific seed that isn't the same as the main overworld?

5 hours ago, LogicSequence said:

Ok, but would it work with a SPECIFIC different seed, i'm not trying for a random seed, i'm trying for a different yet specific seed that isn't the same as the main overworld?

Ah, apologies for the misunderstanding. Most likely not. If you wanted to do that, you would most likely need to remake the entire chunk generator to take in a specific seed, and even then you would need to verify that the seed would still correspond to the wanted result.

I made a video explaining the details of a custom overworld in your own Singleplayer world, without the use of datapacks or modpacks. While there isn't a way to edit the time and weather directly (since this method only adds the world as a dimension), I made it possible to use only an NBT editor, and some folders to transfer a little bit of data. 

Despite the video being a couple years old, this method still works on the latest releases of the game, so don't worry if it says 1.18. Because the filesystem for the worlds have not changed one bit. Also, it might be a bit sloppy, but all you got to do is create two worlds, copy a specific value in the world .dat data using the NBT editor, put it in the world you want it to appear in, and use the three folders called Region, Entities, and Data and put that into the dimensions folder on your main world after you load your dimension for the first time. (optional, but if you wanted your data to be loaded from the other world you generated).

 

My video tutorial can explain it all:

https://youtu.be/xbD76NCVX0Q?si=-Vx9StmkgOZ6-Go0