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{{Infobox version
|title=Minecraft 21w10a
|image=21w10a.jpg
|image2=Java Edition 21w10a.png
|edition=Java
|type=Snapshot
|date=March 10, 2021
|clienthash=7840a9b8d9aeb480b16962c40a2ca3758893f00e
|jsonhash=40a9d63c50dc098824ff9117cc19e39afb61598d
|serverhash=5998d2c7c15fea04b2541efdcbec4c8cfe5df2a6
|clientmap=5f15280e2823d988faa4c3b83db33d11f82f6afd
|servermap=1a24830dcaac223465f4b915759c87fb44c7a0e2
|parent=1.17
|prevparent=1.16.5
|prev=21w08b
|next=21w11a
|nextparent=1.17.1
}}<onlyinclude>

'''21w10a''' is the thirteenth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.17]], released on March 10, 2021,<ref>{{snap|21w10a|March 10, 2021}}</ref> which adds [[Minecraft:lush caves]] and new [[Minecraft:deepslate]] variants.

== Additions ==
=== Blocks ===
'''[[File:Cracked Deepslate Bricks JE1 BE1.png|32px]] [[Minecraft:Cracked deepslate bricks]]'''
* A cracked variation of [[Minecraft:deepslate bricks]].
* Obtained by smelting deepslate bricks.

'''[[File:Cracked Deepslate Tiles JE1 BE1.png|32px]] [[Minecraft:Cracked deepslate tiles]]'''
* A cracked variation of [[Minecraft:deepslate tiles]].
* Obtained by smelting deepslate tiles.

'''{{Animate|Deepslate Coal Ore JE1 BE2.png; Deepslate Copper Ore JE1 BE1.png; Deepslate Emerald Ore JE1 BE1.png|32px}} Deepslate ores'''
* Added deepslate ore variants for [[Minecraft:Copper Ore|copper]], [[Minecraft:Emerald Ore|emerald]] and [[Minecraft:Coal Ore|coal ore]].
** Do not generate by default; they only have been added for use by creators of maps and data packs.
** Like other deepslate ores, they can be used in blasting and smelting recipes like normal ores.
*** Again, like other deepslate ores, they unlock these recipes in the recipe book.

'''[[File:Deepslate.png|32px]] [[Minecraft:Infested deepslate]]'''
* An infested variant of deepslate.

=== World generation ===
'''[[File:Azalea Tree.png|32px]] [[Minecraft:Azalea tree]]'''
* Generate above [[Minecraft:lush caves]], either on the surface or underground.
* Consist of [[Minecraft:azalea leaves]] (both variants), [[Minecraft:oak log]]s and [[Minecraft:rooted dirt]].

'''{{BiomeLink|Lush caves}}'''
* Currently the biome is only accessible in single-biome worlds.
* Adaptive to the environment: every type of cave generation can be a lush cave.
* [[Minecraft:Moss block]]s cover the floors and ceilings, along with [[Minecraft:moss carpet]]s and [[Minecraft:grass]] on the floors.
* [[Minecraft:Spore blossom]]s grow from the ceiling and drip particles.
* Contains [[Minecraft:clay]] pools where [[Minecraft:dripleaf]] plants grow out of them.
** Clay pools sometimes generate [[Minecraft:water]] sources over [[Minecraft:air]], and the water is suspended and does not flow. This has yet to be fixed.
* Contains [[Minecraft:azalea]] bushes (both variants).
* [[Minecraft:Cave vines]] with [[Minecraft:glow berries]] grow from the ceiling and light up the caves.

=== General ===
'''[[Minecraft:Shaders]]'''
* Are now included for all supported render states.
* Any shader except for the blitting shader can also be replaced in resource packs.
* For now replacing these shaders is not officially supported and the way it works may change in the future.
* Current rendering engine uses a system similar to the post-processing shader pipeline. There are some differences between both systems that cater to slightly different requirements.

'''[[Minecraft:Tag]]s'''
* Added the {{cd|coal_ores|copper_ores|emerald_ores|d=and}} block and item tags.
** Contain both the normal and deepslate ores of each ore type.
* Added the <code>lush_ground_replaceable</code> block tag.
** Contains the <code>[[Minecraft:Tag#blocks lush_plants_replaceable|#lush_plants_replaceable]]</code> block tag, clay, and moss block.

== Changes ==
=== Blocks ===
'''[[Minecraft:Deepslate diamond ore]], [[Minecraft:deepslate gold ore]], [[Minecraft:deepslate iron ore]], [[Minecraft:deepslate lapis lazuli ore]], [[Minecraft:deepslate redstone ore]], [[Minecraft:coal ore]], [[Minecraft:diamond ore]], [[Minecraft:iron ore]], [[Minecraft:gold ore]]'''
* The textures of these ores have been changed.
** Iron ore and deepslate iron ore no longer have streaks, better matching the appearance of other ores.
** Diamond ore closer resembles deepslate diamond ore.

'''[[Minecraft:Cobbled deepslate]]'''
* The texture has been changed.
* Can now be smelted back into deepslate.

'''[[Minecraft:Deepslate]]'''
* Both the top and side textures have been changed.
* Deepslate can now be placed along any axis.
* Textures in caves now generate with a random rotation.

'''[[Minecraft:Deepslate bricks]] and [[Minecraft:deepslate tiles]]'''
* Can now be crafted.

'''[[Minecraft:Lava]]'''
* Now replaces air below Y=-53.

'''[[Minecraft:Lightning rod]]'''
* Changelog states they can now be waterlogged, though this is not the case.

'''[[Minecraft:Moss block]]'''
* Using [[Minecraft:bone meal]] on it now spreads moss to blocks on any height.

=== Items ===
'''[[Minecraft:Spyglass]]'''
* The item model has been changed back to a dedicated texture.
** Similar to [[Minecraft:trident]]s, the spyglass still uses a 3d model in the hand.
** The texture is different from the original item texture.

=== Mobs ===
'''[[Minecraft:Slime]]'''
* The maximum size that slimes can be summoned with is now 128.

=== World generation ===
'''[[Minecraft:Crack carver]]s'''
* Now are much less common.

'''[[Minecraft:Fossil]]s'''
* The fossils in the deepest part of the underground generate with deepslate diamond ore instead of coal ore.

[[File:21w10a approximate ore distribution.jpg|thumb|400px|The new ore generation for 21w10a.]]
'''Ore distribution'''
* Now generates more [[Minecraft:emerald ore]] in mountains.
* Now generates more [[Minecraft:lapis lazuli ore]].
* Now generates less [[Minecraft:copper ore]], [[Minecraft:gold ore]], and [[Minecraft:redstone ore]].
* Now generates smaller [[Minecraft:diamond ore]] blobs, but slightly more frequent (less diamond ore overall though).
* Now generates less [[Minecraft:iron ore]], and it generates lower down.
** The deepest iron generation range: previously Y=-64 to -8, now Y=-64 to -32.
** The middle iron generation range: previously Y=-16 to 80 (most at 32), now Y=-24 to 56 (most at 16).
* Reduced air exposure for [[Minecraft:coal ore]].

=== Command format ===
'''{{cmd|/give}}'''
* The give command can only give up to 100 stacks of items at a time (e.g. 6400 stone or 100 iron swords)

'''{{cmd|/spawnpoint}}'''
* Can no longer set a player's spawnpoint to areas that are out of the world.

=== Gameplay ===
'''{{EffectLink|Glowing}}'''
* Glowing is now based on the outline of all layers on an entity, not just the base layer.

=== General ===
'''Game library updates'''
* Rendering is now using OpenGL 3.2 core profile.
** All fixed function rendering has been replaced with shader-based rendering.

'''[[Minecraft:Splashes]]'''
* Changed the splash "OpenGL 2.1 (if supported)!" to "Now on OpenGL 3.2 core profile!"

'''[[Minecraft:Subtitles]]'''
* Glow item frames have their own subtitles, no longer using the same subtitles as normal item frames.

'''[[Minecraft:Tag]]s'''
* Removed moss block, the <code>[[Minecraft:Tag#blocks flowers|#flowers]]</code> block tag, grass, tall grass, moss carpet, small dripleaf, big dripleaf, big dripleaf stem, and vines from the <code>lush_plants_replaceable</code> block tag.
* Removed the <code>azalea_log_replaceable</code> block tag.

== Fixes ==
{{fixes|fixedin=21w10a
|;old
|29318|Client misses inventory updates while the player is manipulating items - causing invisible items.
|32452|Fog generates only in the center of the screen.
|84121|Shape of the glow effect is based on the mob's base layer.
|87019|Only visible slots are updated clientside when you are inside an inventory.
|91888|Hotkeying books on enchantment table causing client-side item count inaccuracy.
|93243|Fog Rendering On AMD Graphics Cards & Integrated Graphics.
|124109|Horses glitched with glowing effect.
|135561|Failed to create OpenGL context on some Linux systems with Nvidia driver.
|148071|If you switch to a crossbow after charging another bow/crossbow, the crossbow you switched to will go weird for a second in the hotbar.
|148206|Hand punching animation is played after eating crops while looking at a block.
|154094|Lectern running {{cmd|clear}} turns items into ghost items.
|165208|Text and other UI elements are completely black when being affected by night vision and void/blindness simultaneously.
|175964|Setblock command run by book in lectern to clear inventory run in command block causes ghost items.
|182455|Entity shadow texture glitching with a resource pack.
|186864|Leather armor can appear white.
|194675|While spectating a creeper, enderman, spider, or cave spider, UI elements are rendered completely white.
|201316|The {{cmd|give}} command can create so many items that the game will freeze.
|210408|{{cmd|spawnpoint}} allows players to set their spawnpoint to out-of-bounds coordinates, which crashes the game when trying to respawn.
|212168|{{key|Ctrl}} + Pick Block does not copy block state "{{cd|lit}}".
|214629|FOV decreases when underwater regardless of FOV Effects accessibility setting.
|215534|Spectating a mob with a shader whilst having a carved pumpkin equipped turns the screen completely white.
|216510|The world border red effect, affects the brightness of a mob's shader.
|;dev
|204782|The glowing effect outline no longer renders (Intel Graphics on macOS).
|205112|Enchantment glint appears white while inside powder snow.
|206628|Emptied Bundles have an empty {{cd|Item}} Tag.
|207818|Placing a sign from the offhand closes the sign UI immediately.
|208301|{{cmd|clear}} does not properly affect the item on the mouse pointer after crafting it.
|208836|Villager incorrectly holding spyglass.
|211666|Guardians attack invisible axolotls.
|212127|Normal ink sac and glow ink sac are not grouped in the creative inventory.
|212144|Subtitles refer to Glow Item Frame as "Item Frame".
|212216|Repeatedly clicking on a sign with an ink sac or glow ink sac abruptly stops the hand animation.
|212236|Cannot visually critical-hit a glow squid (No sound/particles).
|212314|Glow squid remains dark even if there is a light source block next to it.
|212325|Glow Squid entity data (potion effects, custom name, ...) does not get saved.
|213825|Using bone meal on a moss block only spreads moss to blocks on the same Y level.
|214781|Lava does not generate at the very bottom of noise caves.
|214784|Fossils can generate floating in caves.
|214836|Water caves cause the land to be excessively flooded.
|214844|Bedrock can be exposed to the air at the very bottom of the new caves.
|214970|Phantoms continuously make too much flapping sounds.
|215194|Structure blocks do not work below Y{{=}}0.
|215838|There is currently no way to craft deepslate tiles and deepslate bricks.
|215847|Infested stone generates in deepslate areas below mountain biomes.
|215850|Deepslate Tile Wall comes before Deepslate Brick Wall but Deepslate Bricks come before Deepslate Tiles in creative inventory.
|215939|Emerald ore spawns in lower frequencies than it should above Y{{=}}100.
|216136|Polished deepslate slab isn't grouped with the other deepslate slabs in the creative inventory.
|216363|Crash upon replacing soul sand or magma with the other under a tall bubble column using {{cmd|setblock}}.
|216492|Fox incorrectly holding spyglass.
|216735|Stone Lapis Ore generating in Deepslate.
|216736|Lava lakes generate exposure in caves.
|216738|Deepslate diamond ore texture is shifted a pixel to the right.
|216765|Coal ore can generate below Y{{=}}0 when attached to a fossil.
|216817|Inconsistency: Cobbled deepslate cannot be smelted back into deepslate.
|;previous
|217020|Gold ore and deepslate gold ore textures are inconsistent.
}}</onlyinclude>

== Videos ==
{{slicedlime|lCaWjqVNf9A|UTZfKR4Kq80}}

== References ==
{{Reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.1x}}

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Minecraft:Java Edition 21w10a - Revision history

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