Java Edition 21w07a

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 "title": "Minecraft 21w07a",
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 "field": "February 17, 2021",
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 "field": "(link to Snapshot article, displayed as Snapshot)",
 "label": "(link to Version types article, displayed as Type)"
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 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741839<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>4000000F",
 "label": "(link to Protocol version article, displayed as Protocol version)"
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 "field": "7",
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
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 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.16.5|<span style=\"margin-right:-0.35em\">◄</span>◄  1.16.5]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.17|1.17]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.17.1| 1.17.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w06a|◄  21w06a]]\n</td>\n<td style=\"padding: 0.4em\">''' 21w07a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w08a| 21w08a ►]]\n</td>\n</tr>\n</table>"
}

21w07a is the tenth snapshot for Java Edition 1.17, released on February 17, 2021,^[1] which adds grimstone and tweaks ore and cave generation.

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Grimstone

• A new type of stone.
• Generates below Y=0.
  • Has a gradual transition from stone to grimstone starting from Y-level -1 until it reaches -8.
  • Takes over fully underground starting from Y=-8.
• Functions identical to cobblestone and blackstone in that grimstone can be used to craft basic tools, furnaces and brewing stands.
• Can be used as a decorative block.
  • It can be crafted into many different variants. Chiseled grimstone, polished grimstone, grimstone bricks, grimstone tiles.
• Has a hardness value greater than that of stone but can be mined with any pickaxe.
• Can't be insta-mined unlike stone.

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Grimstone Stairs, Slabs and Walls

• Added grimstone stairs, slabs and walls.

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Polished Grimstone Stairs, Slabs and Walls

• Added polished grimstone stairs, slabs and walls.

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Grimstone Tile Stairs, Slabs and Walls

• Added grimstone tile stairs, slabs and walls.

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Grimstone Brick Stairs, Slabs and Walls

• Added grimstone brick stairs, slabs and walls.

Data packs

• Added [Boolean] grimstone_enabled to worldgen/noise_settings/*.json.

Big dripleaf

• Slightly changed model.

Blackstone, polished blackstone bricks, and cracked polished blackstone bricks and stair, slab and wall variants

• Slightly changed the texture.

Glow lichen

• Can now naturally generate on grimstone.

Ores

• The textures of coal ore, diamond ore, gold ore, iron ore, and redstone ore have been changed.
  • Coal ore, iron ore, gold ore, and redstone ore had the shape of the "ore pattern" in the stone changed to make them visually distinct for colorblind players.
  • Diamond ore remains mostly the same as it was the most iconic one of the ores that used this shape.

Beacon

• Beams are now visible up to 1343 blocks away from the source instead of 256 blocks.

Caves

• Noise caves and aquifers appear less often.

Mineral distribution

• Changed ore generation of all ores making them have a spread value and generate in a triangle distribution^[2] like lapis lazuli ore. Some still retain a linear generation alongside a spread generation.
• Coal ore, emerald ore, and copper ore no longer generate below Y=0.
  • Copper ore generates between the Y=0 and Y=96 and like all other ores, uses spread. It peaks at Y=48.
  • Emerald ore generates above Y=32 (up to Y=480 in custom worlds) as a spread, peaking at Y=256 and decreasing in quantity as the altitude decreases.
  • Coal ore attempts to generate twice: once, evenly between an altitude of Y=136 and Y=256; and as a spread, peaking at an altitude of Y=96 and generating between an altitude of Y=0 and Y=192.
• Other ores also generate differently.
  • Iron ore attempts to generate twice: once as a spread peaking at an altitude of Y=256, generating above Y=128 (up to Y=384 in custom worlds); and another as a spread peaking at Y=32 and generating with a minimum height of Y=-16 and a maximum height of Y=80.
  • Gold ore generates between the altitudes of Y=-64 and Y=32, peaking at Y=-16. The extra gold that generates in the badlands biome was left untouched.
  • Lapis lazuli ore attempts to generate twice: once, as a spread between the altitudes of Y=32 and Y=-32, peaking at an altitude of 0; and evenly between an altitude of Y=64 and Y=-64, generating buried like ancient debris.
  • Redstone ore attempts to generate twice: once, evenly between an altitude of Y=15 and Y=-64; and as a spread, peaking at an altitude of -64 and generating below an altitude of Y=-32 (down to Y=-96 in custom worlds).
  • Diamond ore now generate as a spread, generating below Y=16 and peaking at altitudes near Y=-64.
• Tweaked size and positioning of diorite, andesite & granite generation.
  • Pockets of diorite, granite and andesite are now larger and more spherical but less common.
  • Diorite, granite, gravel and dirt no longer generate below Y=0, but gravel and dirt are more common than in pre-21w06a versions.
• Grimstone now generates as the dominant stone below Y=0.
  • Andesite still generates unlike stone, diorite, granite, and dirt.

Mineshafts

• 👁 A 1.17 Mineshaft with ceiling supports and oak log supports from the ground
  

  Corridors are now supported by chains and oak fences above when the layer is nearer to the ceiling than the floor.
• Wood pillars are now made of logs instead of wood.

Strongholds

• Are now encased in stone and/or grimstone, depending on the depth.

Creative inventory

• The "Redstone Tab" has been reordered to prioritize highly-used blocks.
• Redstone items/blocks have been grouped and ordered in the following way (from top to bottom): Essentials, Unique activators, Miscellaneous, Common activators, Openables.

Data packs

• Vanilla configured features for ore types have changed:
  • Coal and iron have been split into two parts called _upper and _lower.
  • New lapis configured feature: ore_lapis_buried.
• The glow_lichen feature now lists grimstone as a valid block.
• Changes to the range decorator configuration:
  • bottom_offset, top_offset and maximum fields removed.
  • Replaced with bottom_inclusive and top_inclusive which are both a new type of vertical anchoring.
  • This type can have several forms:
    • absolute - specifies an absolute Y value.
    • above_bottom - specifies an offset above the minimum Y coordinate of the world.
    • below_top - specifies an offset below the maximum Y coordinate of the world.
• The range_biased and range_very_biased feature decorator are now called range_biased_to_bottom and range_very_biased_to_bottom respectively.
  • Both biased types of ranges now have bottom_inclusive and top_inclusive of the same type, and a cutoff value that's a numeric value
• The depth_average decorator also now has its baseline field as a vertical anchor instead of an absolute Y value.
• A whole range of decorators no longer exist or have had part of their functionality replaced by using some of the already existing generic decorators:
  • dark_oak_tree decorator no longer does a heightmap check, needs to be done with a heightmap decorator.
  • The end_gateway decorator has been split, now used with a combination of chance, square & heightmap - see the end_gateway configuration in the vanilla pack for an example.
  • The glowstone_blob feature no longer does its own decoration, instead is used with a combination of square & range. See glowstone_extra in vanilla files for example.
  • The lava_lake feature has also been split, now used with chance, square, and range_biased_to_bottom. See lake_lava for an example.
  • The water_lake decorator has been removed. Now instead chance, square & range.
  • The emerald_ore decorator has been removed. Now instead count, square & range.
  • The fire decorator has been removed. Now instead range, square & count.
  • The carving_mask no longer has a probability field, replaced with a chance decorator.

Tags

• Added grimstone to the base_stone_overworld block tag and the stone_crafting_materials and stone_tool_materials item tags.
• Added various grimstone variants to the slabs, stairs, and walls block and item tags.

13 issues fixed

From released versions before 1.17

• MC-125675 – Seagrass placed on the ocean floor can replace ocean monument parts.
• MC-147589 – Vines no longer randomly generate in jungles.
• MC-183547 – Stone and polished blackstone buttons/pressure plates are located at opposite ends of the spectrum of buttons in the Creative inventory despite being identical in behavior.

From the 1.17 development versions

• MC-208613 – Amount of players who need to sleep to skip the night is calculated incorrectly.
• MC-208618 – Clicking on a bed immediately skips the night if gamerule playersSleepingPercentage is set to 0.
• MC-211224 – Seagrass can occasionally replace parts of a swamp hut.
• MC-214082 – Crash after placing soul sand or magma under 2032-block-tall water.

From the previous development version

• MC-214814 – Strongholds generate floating and without walls, floors, or ceilings when inside caves.
• MC-214885 – Beacon beam only render 256 blocks from source.
• MC-214917 – Lapis Lazuli doesn't generate on the lower levels of the world.
• MC-214928 – Mineshaft corridor support pillars are made out of wood, not logs.
• MC-214973 – Powder snow bucket in a dispenser at Y=319 facing upwards or at Y=-64 facing downwards is replaced with empty bucket, despite no powder snow being placed.
• MC-214986 – Large dripstones only generate as stalagmites below Y=0.

• 👁 Ores with a grimstone background. The textures were made by JAPPA, and were implemented on the following snapshot.[3]
  
  Ores with a grimstone background. The textures were made by JAPPA, and were implemented on the following snapshot.^[3]
• 👁 A mineshaft generating with chains and logs.
  
  A mineshaft generating with chains and logs.