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15w34a[1] is the tenth snapshot released for 1.9.

Changes

Combat
  • New “attack strength” combat mechanic.
    • A meter shows up after switching items or attacking depending on the new attack indicator option in video settings.
      • Damage done depends on the fullness of the meter.
      • Fills in 0.25s for non-weapons, 0.8s for swords, pickaxes, and shovels, and 1.2s for axes.
      • Can be displayed next to the hotbar (left or right based on the player's main hand), under the crosshair or turned off.
  • Delay when selecting a sword, pickaxe, axe or shovel into the main hand.
Maps
  • Now start at a wider zoom level (1:4 instead of 1:1).
  • New recipe for zooming in on a map: craft shears and a map together in any shape.
    • Zooms in on the lower-right quadrant of the original map.
Command blocks
  • Contraptions from earlier versions will still work.
  • New textures that now vary depending on what direction they are placed, similar to logs and pistons.
  • 3 modes: impulse, chain, and repeat - color changes based on mode.
    • Impulse mode (orange): Command is run on rising edge.
      • Same behavior and color as previous versions.
    • Chain mode (green): Command is run whenever a command block pointing into this command block executes while this command block is powered - chain signal is forwarded even through disabled chain command blocks.
    • Repeat mode (blue): Command is run every game tick while powered.
    • Each new mode has its own block id and is obtainable with /give and pickblock.
  • Animated texture: The colored pixels in the middle change color.
  • Poweredness is now a data tag, allowing command blocks to stay enabled without needing redstone blocks next to them.
Minecarts with command blocks
  • Uses previous command block functions - no chain or repeat mode. However all commands before still work.
    • Because of this, there is no texture for the command block in the minecart and the block is just black.
  • Done button is available even when the command line is empty.
Zombies and zombie pigmen
  • Now lift their arms when becoming hostile.
Endermen
  • Now have an attack animation.
Giants
  • No longer renders the model.
  • Still can be summoned using commands.
Optimizations
  • Optimized mob AI, path finding and block ticking.
    • 15% tick speed increase on 16 render distance.

Fixes

7 issues fixed
From released versions before 1.9
  • MC-86152 – Records lose their custom name when placed in a record player
From the 1.9 development versions
  • MC-83471 – "CustomPotionEffects" Inoperable with Splash / lingering Potions
  • MC-84260 – tipped arrows show no potion particles
  • MC-85115 – Dragon Fireball doesn't have a name (entity.DragonFireball.name)
  • MC-85592 – Default log4j2.xml is suboptimal
From the previous development version
  • MC-86137 – Crash when breaking heads
  • MC-86138 – Pick block on Mob (Dragon) Head / Structure block crashes the game

References

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