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The newest version of Minecraft has a modified terrain generation system. Not only does this add new terrain features, but it fundamentally changes generation. For this reason, seeds used in previous version produce radically different results from the same seeds in the new version.

Because save files contain all previously-rendered chunks, it is my understanding that 1.7.3 maps will work in 1.8, and simply not have some of the new features. However, what happens when I move into areas of the map I haven't explored? Will it generate new chunks the 1.8 way, creating mis-matched boundaries? Or will it use the 1.7.3 terrain generator?

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up vote 14 down vote accepted

It will create mis-matched boundaries, I've tried to create a map with 1.8, played on it a little and then re-installed 1.7.3 ... The biomes was a mess, no snow but water was turning to ice in normal biome, mountains were cut off abruptly to create new terrain from the 1.7.3 version.

So yeah it will work, but if you create the terrain on 1.7.3 or 1.8, it will stay as it is but new terrain will be generated compared on which version you are using.

See pictures:

enter image description here enter image description here enter image description here enter image description here

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+1 for pictures. Can i get a copy of those worlds? :) – Joe the Person Sep 11 '11 at 5:34
Well that one is pretty messed now because I took picture from 1.7.3 then 1.8 and brought it back to 1.7.3 ... – Warface Sep 11 '11 at 5:40
That's actually pretty cool... – Cyclops Sep 11 '11 at 12:50
Thanks for your answer. I kind of want to try it. :) – Matt Sep 11 '11 at 20:21
but do you think notch will fix it? cuz i ant gonna update until im sure it wont mess up my precious word... – user12457 Sep 14 '11 at 18:35

It is currently impossible to import your 1.7 world to 1.8 without a blend of 1.7 and 1.8 terrain, Notch has already mentioned this at PAX.

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Thanks for the answer. – Matt Sep 11 '11 at 20:21

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