I'm not sure if this is intended or if it's a bug:
After updating Minecraft to 1.8, I got a little bored on my Survival world decided to go find NPC Villages to trade. Call me lazy, but I used a map viewer tool (it's not a mod, it doesnt change game files or java stuff) called AMIDST 3.7 to find villages, strongholds, biomes, etc. As far as I know, this tool only views the save files not alter it or corrupt it. So I followed the map on a little quest to go to the NPC Village it located and it showed that a near village is by the end of the river near the edge of a jungle. so i followed the river but once i got 10 blocks or so away from the coordinates of the supposed NPC village, nothing was there. The biome that AMIDST shown is that the village is on a River/Plains biome. Instead (btw i was using 1.8 to explore in the game) it was on a savanna.It was weird because I know i created my Survival world on Minecraft version 1.5.1 release and savannas biome didnt exist at that time. It was also weird that the game seemed to completely regenerate a part of the world(probably because of 1.8) beyond a certain exact boundary (which happened to be at the end of my Quest). Thats's what i believed what happened, the version was updated and part of my world got completely regenrated. So the question is: Is it normal for the game to regenerate part of my world when i update the minecraft version? it's as if theres a fine line between my regular world and the regenerated world
I also noticed that whenever there's a version release like 1.6, 1.7, or 1.8 and it comes with new mobs, ores, etc, my survival world doesnt seem to apply them. But beyond this regenerated boundary (which i talked about above), the world seems to be applied 1.6, 1.7,or 1.8 stuff like horses, rabbits, diorite. It was good though that the game allows objects to pass through this. I got a horse through the boundary without any glitches and hooked it on a fence with a lead. I was glad I discovered that regenrated part, so i can bring in recent additions like new ores, mobs, etc.
I apologize if the whole issue sounds unclear, just reply if you need clarification. Thank you.
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AMIDST dioes not read the save files, it reads only the seed and settings of the world.
It shows you where villages, temples and stuff would be by simulating the generation of the world with the selected Minecraft version.
If you still feel that is a bug, recreate your world with Minecraft 1.8, walk to the coordinates provided by AMIDST, check if there's a difference
If so, provide the seed and the coordinates here.
So I used my world seed on AMIDST and Minecraft, both were set to 1.8, and they were consistent results. However when I set them both to 1.5.1 (i created a new world with the same seed) and used the same seed, theres a river where the village was supposed to be, but whats weird was that the biomes and spawn point shown by AMIDST were correct. So it's either the game glitched when generating the village or AMIDST may have misinterpreted it as a village?
What i understand is that the game generates the chunk when a player gets close to it and once that chunk is generated, it can't change because of a new update. So if the player wants to experience the new update, they'll have to go to the part of the world where the chunks havent been generated yet and get close to the unloaded chunks when the game will generate the chunks using the update.
And Marcono1234 was right. I never visited that area before so its chunks were never loaded until i was looking for the village.
It could be indeed that they changed the world generation, but now I have also a question 🙂
Does only this map program show that there should be a vilage or another biome, or where you already at this biome before?
It could be that this map program uses some code to calculate the generation, but maybe this code is outdated because MOJANG made some major map generation changes.
Also the thing you have noticed, that old worlds do not contain the new stuff makes sense 🙂
Because once the terrain is generated, it won't generate again. But when you want to get new stuff, you can either just walk a little bit further (so you get in chunks which weren't loaded before), or you can also use tools like MCEdit to delete some chunks, but I would advise you against this 🙂
New mobs should also spawn in already generated chunks (if the mob normally spawns in this biome).
I hope that helped you 😉