

You can actually play the game and fly around in creative mode, following the border of your world and loading new data. There are two ways to generate the new chunk data.

Those too, the missing interior chunks, will suffer from generation glitches that will leave strange artifacts behind (like a perfectly square patch of desert sand in a the middle of a snowy biome). This kind of map will have sprawling glitches along the extensive edges as well as pockets of glitches inside the interior map where the player never ventured and thus no chunks were very generated. We purposely created a small square map in Minecraft 1.6.4 expressly to both hyper accentuate and localize the extreme changes between the old and new terrain to showcase it for you.Ī "lived in" map where you've been organically exploring and playing the game won't have such a perfect square shape but will instead have all sorts of forks, curves, and such where you've moved around the map without thoroughly exploring every inch edge-to-edge. Now, we'll be the first to tell you that our perfect 32x32 out-of-place square is an extreme example where the edges are painfully obvious. When the two clashed together Minecraft essentially said, "OK, these chunks already exist so we will not attempt to generate them again, but the player needs new chunks so we'll apply the current version's generator." The result is the horrible mishmash you see above.

Mountains will plunge down sheer faces into oceans, strange perfectly square patches of forest will appear in deserts, and other ugly artifacts will appear on your maps. This means if you load a map created in Minecraft 1.6.* into Minecraft 1.8.* then the transitional areas between the area you've already explored and the new areas you will explore in the future will be very ugly as the terrain generator will generate completely mismatched terrain. The world seed remains with the world map for the life of that map but what the terrain generation algorithm creates based on that seed can change significantly between major Minecraft versions. Where it breaks down (and what we're concerned with today) is when players bring an old map from a previous version of Minecraft into a new version of Minecraft. This system works very well, and it's the magical underpinning of the Minecraft universe wherein players can keep roaming and roaming with new hills, mountains, caves, and more generated on the fly for them to explore.
