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I have a default generated world and I created a few things in it. I want it to become superflat and I don't want to loose any progress I made in the world. Is that possible ? I've seen the opposite here but I can't find the generatorType variable in my level.dat .

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With the way Minecraft works, changing the world's generator for a superflat setting will only have an effect of new chunks of land. So all of your existing world will remain the same, the superflat areas will only be the new lands you discover in your world. –  Gnoupi Jan 7 '13 at 13:49

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up vote 4 down vote accepted

It could actually be generatorName. You may also need to set generatorOptions to one of the SuperFlat preset.

A screenshot of NBTExplorer


Edit:

Just tried that (generatorOptions = 2;7,2x3,2;1;village) on client and this happened near the spawn point:

Changing default world type to superflat...

It's probably because I save and quit too early... lol


Wow

enter image description here

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now I have squids keep falling down... –  Alvin Wong Jan 7 '13 at 13:30
    
The problem seems to be that changing the generator changes the new chunks, no? Not the existing ones. This, or you got the wrong parameters for the generator :P –  Gnoupi Jan 7 '13 at 13:37
    
@Gnoupi because I basically just create the work, then in one second I press Esc -> Save and Quit, probably the game hasn't yet generated all the visible chunks... And I would really encourage using a superflat preset which has a ground level of 64. –  Alvin Wong Jan 7 '13 at 13:41
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ah, that explains indeed. You have parts which are made with the initial (random) generator, before you saved and changed it. –  Gnoupi Jan 7 '13 at 13:48

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