![]() A "Sections" List tag containing Compound tags has been added with up to 16 Compound tags.The 16×128×16 "Blocks", "Data", "SkyLight" and "BlockLight" tags were moved and repurposed.The world generator has not been changed, so there is an additional 128 blocks of air above the usual terrain, making 192 blocks from sea level to the height limit. Versions from 12w07a to 1.17.1 automatically convert worlds to the new format, but a copy of the world files is created in the previous formats for compatibility with older game versions. It also prevents bugs where features don't match the biome after changing the terrain algorithm. Biomes are saved per X,Z column, rather than being calculated on the fly, which means they can be altered by tools this is useful for map makers.Packets for sending chunks have been optimized (a chunk without air is smaller than in the same chunk in the old format, and a chunk with lots of air is even smaller).Block ordering has been changed from XZY to YZX in order to improve compression.The rest of Minecraft's code was not prepared to take advantage of this until terrain.png was removed and resource locations were added. The maximum Block ID has been increased to 4096 (was 256) by adding a 4-bit data layer (similar to how meta data is stored).Empty sections of the world are not loaded into memory or saved to disk. ![]() Maximum build height has been increased to 256 (from 128).The Anvil format introduced these changes to the Chunk format: The only changes from MCRegion to Anvil were in the Chunk format the Region file format is still used, but labeled as Anvil. Converting a world from MCRegion format to Anvil.
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