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I just opened a nether portal for the first time, and I must say, it's not a very good location, a sort of narrow trench/cavern thingy without any obvious clues as to which direction is "out".

I'm not willing to simply move my overworld portal (due to dilation it is unlikely to have much of an effect, anyway), and was wondering if there was a way to force minecraft to generate a new personal Hell for me to explore (hopefully one that doesn't involve me stuck in some wall!).

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11  
Better than popping out in open sight of a dozen ghasts! Why not dig around and "secure" your exit portal? You'll break out into the main caverns soon enough. –  Sapph Apr 1 '11 at 5:15
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The answer would probably involve deleting the world data file that contains the Nether. On a server, it's nicely contained in a separate world folder named "Nether", but I have no idea which file it is in single player. –  Kevin Y Apr 1 '11 at 6:48
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Boring is good! You have an ideal location to build a secure Nether base without ghasts constantly exploding your work. Dig in any direction and you'll find excitement/danger soon enough. Then you'll really appreciate your portal's boring location! –  SevenSidedDie May 16 '11 at 15:37
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+1 for the title. –  Maxpm Oct 9 '11 at 5:38
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1 Answer

up vote 56 down vote accepted

The safe answer

Assume the following:

  • $MINECRAFTDIR is the path to the Minecraft directory containing your custom data: texture packs, saves, etc.
    • Mac OS X: ~/Library/Application Support/minecraft
    • Linux: ~/.minecraft
    • Windows: C:\Users\[username]\AppData\Roaming\minecraft.
  • $WORLDDIR is the name of the world directory (e.g. World3).

The Nether region information is stored in $MINECRAFTDIR/saves/$WORLDDIR/DIM-1/: if you delete the region folder within, Minecraft will regenerate the Nether.

The first time you delete it, you might see significant changes (especially after a terrain generation update like 1.8 or 1,9), but if you do nothing and delete it again, you'll notice nothing's changed. That's because the Nether and the real world share the same seed: the first delete just resets the Nether back to its original state (or its new state when the terrain generation code changes) and, since the seed doesn't change, any subsequent deletes do nothing.

So unfortunately, you can't create a completely new Nether while keeping the same regular world intact. But you can at least wipe your Nether clean or have it use the new terrain generation code after a major update.


The Oh-God-You're-Messing-With-The-Forces-Of-Nature answer

It's possible to replace your current world's seed with a new one which, when combined with the instructions above, will create a completely new Nether. I have no idea about the long term implications this will have on your real world, but it should only affect new chunks, not existing ones.

To do this, you'll need a level.dat editor that lets you record and change your current position and export your inventory. I used InvGrid to do this.

Note: this likely awakens the old gods, so be sure to backup your world folders before doing this.

  1. Create a new world, and either enter a seed or randomly generate a new one.
  2. Save and quit out of Minecraft.
  3. Open InvGrid, and select your original world.
  4. Under the Misc. tab, note your current position (and spawn point, if you want to keep it, although it's not that essential now that you can reset your spawn point with beds)
  5. Export your inventory, as you'll be wiping it out shortly.
  6. Save and quit out of InvGrid.
  7. Use the safe answer instructions to delete your world's Nether region (tee-hee).
  8. In your world's folder, delete level.dat.
  9. Copy the level.dat file from the new world you created in step 1 to your curent world's folder.
  10. Open InvGrid and select your world again.
  11. Set your position to what you recorded in step 4.
  12. Import the inventory you exported in step 5.
  13. Save the world and quit InvGrid.
  14. Whisper dark incantations and sacrifice whatever live animals you have to appease the old gods.
  15. Open Minecraft and your world.

You should now have a completely new Nether: at least, it worked on the worlds I tested.

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So where's the seed stored? If we change the world seed after the world's already been generated, its sorta irrelevant (after all, the world's already been generated) but would let us get a new nether. –  Raven Dreamer Apr 2 '11 at 2:45
    
@Raven I've added some instructions to replace your seed and subsequently generate a completely new Nether. It shouldn't affect chunks already generated, but it'll no doubt affect new chunks. –  user3389 Apr 2 '11 at 3:19
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if I could +1 you twice for the tone of your answer, I would. –  Raven Dreamer Apr 2 '11 at 4:39
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+50 for awakening the Old Gods! Too bad I can only give +1... –  Kromey May 6 '11 at 19:11
    
now this would be interesting if you walk 1 chunk at a time and reload the seed every chunk.. –  Marco Geertsma Jun 4 '13 at 9:49
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