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Here's a snapshot from the blender! In this snapshot, world generation around the edges of an old world will now be adjusted for a smoother transition! This is the first iteration of this system which we expect to keep improving. Keep in mind that if you try it out now, the result will be saved to your world forever - which, as we know, is quite a long time. Better be safe than sorry. Make a backup before you try it!
Also - the space underneath existing chunks is now filled in, but only with deepslate. We will later be adding full cave generation in this place, so if you want that in your world, make a backup before you try it!
Due to some updates to terrain generation in this snapshot, seeds have shuffled once again so worlds will not look like they did in the previous snapshot. We expect world seeds to be stable after this snapshot.
Oh yeah, did we mention that it's a good idea to make a backup?
This update can also be found on minecraft.net.
If you find any bugs, please report them on the official Minecraft Issue Tracker. You can also leave feedback on the Feedback site.
New Features in 21w43a
- The edge between old and new world generation is now adjusted when you upgrade a world
Upgrading of old worlds
- When generating close to old chunks hew terrain is adjusted to better match the existing terrain at the borders
- In old chunks, if there is Bedrock at y=0, the column below will be filled with Deepslate
- Worlds upgraded in this snapshot will permanently have this deepslate, so if you want new caves under height 0 later, make sure to keep a backup before upgrading
- The old Bedrock between y=0 and y=4 in old chunks gets replaced with Deepslate
- A new Bedrock layer is placed at y=-64
Changes in 21w43a
- The Priority Updates video setting has been renamed to Chunk Builder
- Reduced the amount of flooded caves near river and ocean coastlines
- Aquifer water levels change less often, so you'll more often have larger areas with the same water level. This means slightly fewer underground waterfalls and slightly easier underground boat travel
- Lava aquifers are slightly less common
- Restricted Big Dripleaf placement to Clay, Grass, Dirt, Farmland, Moss, Rooted Dirt, Podzol and Mycelium
Technical Changes in 21w43a
- Some internal details of block and fluid ticking have been changed to improve save times. While it should behave exactly as it was, it might be a good time to test your redstone contraptions (on a copy of a world or with a backup, of course)
- The Chunk format has been updated
World Data: Chunk Format
- Removed chunk's
Leveland moved everything it contained up - Chunk's
Level.Entitieshas moved toentities - Chunk's
Level.TileEntitieshas moved toblock_entities - Chunk's
Level.TileTicksandLevel.ToBeTickedhave moved toblock_ticks - Chunk's
Level.LiquidTicksandLevel.LiquidsToBeTickedhave moved tofluid_ticks - Chunk's
Level.Sectionshas moved tosections - Chunk's
Level.Structureshas moved tostructures - Chunk's
Level.Structures.Startshas moved tostructures.starts - Chunk's
Level.Sections[].BlockStatesandLevel.Sections[].Palettehave moved to a container structure insections[].block_states - Chunk's
Level.Biomesare now paletted and live in a similar container structure insections[].biomes - Added
yPosthe minimum section y position in the chunk - Added
below_zero_retrogencontaining data to support below zero generation - Added
blending_datacontaining data to support blending new world generation with existing chunks
Bugs fixed in 21w43a
- MC-131930 - Deep warm ocean generates without coral and sea pickles
- MC-156616 - Badlands layers not generating properly
- MC-217379 - Pufferfish don't spawn in deep warm ocean
- MC-236624 - Deep Warm Oceans don't count towards the "Adventuring Time" advancement
- MC-236970 - Badlands strata is covered by orange terracotta at Y=160 and above
- MC-238073 - Decorators are independent of world seed
- MC-238939 - Stone can generate in the Nether
- MC-239397 - Lava pockets generate in icebergs
Get the Snapshot
Snapshots are available for Minecraft Java Edition. To install the snapshot, open up the Minecraft Launcher and enable snapshots in the "Installations" tab.
Testing versions can corrupt your world, please backup and/or run them in a different folder from your main worlds.
Cross-platform server jar:
What else is new?
If you want to know what else is being added and changed in Part II of the Caves & Cliffs Update, check out the previous snapshot post.
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