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Currently the terrain generation algorithm is bugged, most likely in several ways. There was a solution for probably the most serious one at http://getsatisfaction.com/mojang/topics/terrain_generation_is_a_broken_scrambled_mess, so I've implemented it. I wouldn't really call this a real mod, because it's just switching two variables in the code, but you have to install it, like any other mod (overwriting the exisiting class file in minecraft.jar). The credit for finding the bug goes to jmlsteele, who btw has a legit patcher that fixes SMP terrain generation. I searched, but I couldn't find any other mod, that could do this fix for SSP. If there is any, this post is obviously redundant and I've just wasted a hour of my time figuring out how to mod minecraft.

I tested it on a new map. I walked around a bit before saving this image.

Original:


I deleted all the chunks using MC MapDeleter / Pine Tree Generator, then I installed this mod, and walked a bit around the same area again. The game automaticly regenerated the same chunks (the random seed for the map is still the same), but this time sand and grass became alligned.

Fixed:


As you can see this solution is probably not perfect. Most of the sand seems to be in the right place, but there are still a few wierd things around, that I'm just going to ignore. All I can say, that it's definetly better with this fix than without.

The fix only affects the terrain, while it's being generated, so it does nothing with your already existing save file. If you want to fix your world, that's already generated, then you can just download the Map Deleter I already mentioned. There you can manually select the bugged chunks, delete them, and after applying this fix, Minecraft should properly regenerate them as soon as you get close to the area in-game (not tested yet). You obviously lose anything you had in those chunks. Wierd things might also happen with trees growing around the edge of the deleted chunks.

This is made for Beta v1.2_01.

Download normal version

The BiomeTerrainMod already uses the rx.class file, without fixing this bug. I don't use that mod, but according to some people, the resulting terrain is still affected by this bug, so I fixed the same thing there too. Install this only after BiomeTerrainSSP06b.
Download BiomeTerrainMod version


Just to be safe, always back up everything! I'm not responsible for any damage you might think this mod caused. The normal one should be working OK though. I don't really care about BiomeTerrainMod, so I haven't tesed it, and probably never will. It might not even work at all.

oh wow. i will use this next time i make a map. but right now i have too much stuff on the map im using right now to risk anything.

+1 to you sir. hopefully notch will see this and use it.

Quote from thefrop »

oh wow. i will use this next time i make a map. but right now i have too much stuff on the map im using right now to risk anything.

+1 to you sir. hopefully notch will see this and use it.

This problem is already officially acknowledged for at least a month or so. Still, it hasn't been fixed. My guess is that the whole generation process is planned to be rewritten in the future, and that's why this hasn't been fixed. Or at least I hope there is some reasonable answer. But I grew tired of waiting, and like I said the solution was already available.

Awesome to have, or at least see... It apparently conflicts with the terrain mod, since that is designed to work off the bugged file, I suppose, and so the fixed one causes it to crash. Rather ironic, in a way...

Thanks for this. That bugged terrain was annoying.

That's absolutely incredible, thank you sir!

Anyone here who wants to make a SMP fix out of that?

Anyone here who wants to make a SMP fix out of that?
[Edit]

This is what bugs me about notch. We're fixing his stuff for him.

I swear, if he just let the modders do the debugging and testing, we'd be set.

Also, the terrain generator mod KIND OF fixes this. The "pimples" of scrambled chunks are smaller.

Quote from 4rz0 »

Anyone here who wants to make a SMP fix out of that?

http://minecraft.stfu.ca/patcher/

Edited the original post with the BiomeTerrainMod version. Since I'm not going to test it, it would be nice if someone could tell if it's working or not.

Before:



After:


Thanks

But I'm kind if annoyed that I deleted the chunk that had my cave house in it. :/ Though that has nothing to do with the fix, it was my own error.

can this be use, edited or written for smp? perty plz.

please dont respond "its for single player,derr" i know...i would like to know if it could be used to mod the server.jar files...

Does this work for errors related to nether travel? Basically, I travelled far away in the nether, and when I came out there's huge walls of rock. If I delete the sharp wall chunks and use this, will it blend it so it looks right?

I. Love. You.

More people need to know about this.

Omg thank you so much, I had no idea how much this issue was bothering me until installing this. It is often said that there is no world as good as your first and for me this was true, every world since then has seemed off, tainted, unappealing, sometimes downright ugly. I had thought it was because they weren't the first world I had created. In reality I realize, it was because they looked wrong, chunks messed up all over the place, it destroyed the landscape entirely, it robbed the game of any and all visual appeal.

I installed your mod, intending to generate world after world looking for a good one. I got stuck on the first one I tried, it just seemed so perfect again. I have no desire to continue my other worlds now, this is my new home.

Thank you again, such a simple fix with such a profound effect.

-Aedda