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TNT exploding.

An explosion is a physical event, generally destructive, that can be caused by several different circumstances. It can destroy nearby blocks, propel and damage nearby players, entities, and their armor, and cause one or more fires. Explosions produce a "shockwave" particle effect.

Multiple close explosions may propel objects further, but have no cumulative effect on the destruction of a block. This is because explosions' damage to blocks is evaluated individually (per explosion), and blocks' blast resistance does not become "weakened" per explosion.

"Destroyed" blocks have only a 25% chance of dropping as collectible resources (and otherwise disappear), generally making explosions a poor resource gathering technique. Items that already exist as dropped collectible resources are not affected by explosions.

The propulsion effect of explosions is often used for TNT cannons.

Explosion Type Power Notes

Wither
(on creation)
7

Ender Crystal
6 May start fires

Charged Creeper
6

Bed
(in Nether or End)
5 Starts fires

TNT
4

Creeper
3

Ghast
fireball
1 Starts fires

Black Wither Skull
1

Blue Wither Skull
1 Treats blast radius blocks (except bedrock and end portal frames) as having a blast resistance of no more than 4.

Effect[modifica | modifica wikitesto]

Model of block destruction[modifica | modifica wikitesto]

1352 rays from the explosion center to points that uniformly distributed on the surface of a cube centered at the explosion with an edge length of 2. (However, this only defines their directions, not their length)
The roughly spherical pattern of blocks destroyed can be seen here.

An explosion can destroy nearby blocks. Its blast effect is evaluated independently on many explosion rays originating from the explosion center, as shown in the right figure.

  • Each ray has an initial blast force randomized in [0.7 × power, 1.3 × power].
  • The effect of the blast force is examined at checkpoints on the ray with step length of 0.3.
  • The blast force is absorbed (block resistance/5 + 0.3) × step length by the non-air block (no matter whether destroyed) at each checkpoint, and attenuated by step length × 0.75 between checkpoints, until completely absorbed or attenuated.
  • A block is considered destroyed if it can't completely absorb the blast force at any checkpoint in it (air blocks can be destroyed too).

From the above process, the following results can be deduced (where ⌊x⌋ is the floor function):

  • The blast radius in the air of an explosion (i.e. only attenuated, not absorbed by blocks) = ⌊1.3 × power/(step length × 0.75)⌋ × step length = 10.2 (charged creepers), 6.9 (TNT), 5.1 (creepers), 1.5 (fireballs). For example, a TNT explosion can destroy a torch 7 blocks away. But how many blocks an explosion can destroy is non-deterministic and also dependent on the specific location of the explosion.
  • The minimum block resistance required to absorb maximum blast force of an explosion happening in nearby air = ((1.3 × power − attenuation steps × step length × 0.75)/step length − 0.3) × 5. To not be destroyed, a block has to absorb all blast force at the first checkpoint in it.
    • The attenuation steps is subject to collision restrictions. For explosion in air, there is at least one attenuation step. TNT and creeper explosion are always 0.49 and 0.5 meter away from nearest block (2 att. steps), but fireball explosion can happen anywhere (1 att. step).
    • Thus, the block resistances are 121.00 (charged creepers), 77.67 (TNT), 56.00 (creepers), 16.42 (fireballs).
    • So water, lava (Note: Only the stationary block) obsidian, and bedrock are always indestructible, and fences and less blast-resistant blocks can be destroyed by fireballs. These are theoretical values, and in reality less resistant blocks are not always destroyed, and since Minecraft is supposed to be simple, there is no such mechanic.

Interaction with entities[modifica | modifica wikitesto]

An explosion has different effects on entities than blocks. Entities are damaged and propelled by an explosion if within its damage radius of 2 × power. Note that the "damage radius" is different from the blast radius of explosion effect on blocks.

  • For each entity within the radius, define impact = (1 − distance from the explosion/radius) × exposure.
  • Apply (impact2 + impact) × 8 × power + 1 point (half-heart, so we don't have to divide by 2 everywhere) of damage to the entity.
  • Propel the entity so that its velocity increases by impact in the direction from explosion to the entity.

From the above process, the following results can be deduced:

  • Entities will always get at least 1 point of damage if they are within the radius, regardless of their explosion exposure.
  • The maximum damage that entities can take (at the explosion center with 100% exposure) = (1 × 1 + 1) × 8 × power + 1 point of damage = 97 (charged creeper), 65 (TNT), 49 (creepers), 17 (fireballs). When entities are away or covered by blocks from the explosion center, they take less damage.
  • The maximum velocity gain that an entity can obtain from a TNT explosion is 1, at the explosion center with 100% exposure.
A primed TNT AABB has directionally asymmetrical sample points (1/2.96 spacing) because of rounding.

Calculation of explosion exposure[modifica | modifica wikitesto]

Explosion exposure is simply how much an entity is visible from the explosion center, and is approximated with the ratio of visible sample points on the entity. The approximation algorithm has sampling error that results in directional asymmetry of propulsion. For example, a typical TNT Cannon has maximum range in the west direction partly because the primed TNT has largest sampled exposure in that direction.

Causing fire[modifica | modifica wikitesto]

If the explosion has the ability, it randomly starts fires in 1/3 of all destroyed air blocks that are above opaque blocks.

Permanent lag[modifica | modifica wikitesto]

Permanent lag is essentially lag-fallout from an explosion, this consists of drops, liquid-physics, and increased render-complexity of the crater.

It is recommended that when making a large creative-mode explosion, one uses the command "/gamerule doTileDrops false" to stop drops from being generated by explosions.

Blast resistance[modifica | modifica wikitesto]

[edit values]

Block name Blast resistance

Bedrock
Template:Blast Resistance Values

Command Block
Template:Blast Resistance Values

End Portal
Template:Blast Resistance Values

End Portal (block)
Template:Blast Resistance Values

Anvil
Template:Blast Resistance Values

Enchantment Table
Template:Blast Resistance Values

Obsidian
Template:Blast Resistance Values

Ender Chest
Template:Blast Resistance Values

Flowing Water
Template:Blast Resistance Values

Lava
Template:Blast Resistance Values

Water
Template:Blast Resistance Values

Dragon Egg
Template:Blast Resistance Values

End Stone
Template:Blast Resistance Values

Block of Diamond
Template:Blast Resistance Values

Block of Emerald
Template:Blast Resistance Values

Block of Gold
Template:Blast Resistance Values

Block of Iron
Template:Blast Resistance Values

Block of Redstone
Template:Blast Resistance Values

Bricks
Template:Blast Resistance Values

Brick Stairs
Template:Blast Resistance Values

Hardened Clay
Template:Blast Resistance Values

Cobblestone
Template:Blast Resistance Values

Cobblestone Stairs
Template:Blast Resistance Values

Cobblestone Wall
Template:Blast Resistance Values

Iron Bars
Template:Blast Resistance Values

Jukebox
Template:Blast Resistance Values

Moss Stone
Template:Blast Resistance Values

Nether Brick
Template:Blast Resistance Values

Nether Brick Fence
Template:Blast Resistance Values

Nether Brick Stairs
Template:Blast Resistance Values

Stone
Template:Blast Resistance Values

Stone Brick
Template:Blast Resistance Values

Stone Brick Stairs
Template:Blast Resistance Values

Stone Slabs
Template:Blast Resistance Values

Iron Door
Template:Blast Resistance Values

Monster Spawner
Template:Blast Resistance Values

Cobweb
Template:Blast Resistance Values

Dispenser
Template:Blast Resistance Values

Dropper
Template:Blast Resistance Values

Furnace
Template:Blast Resistance Values

Beacon
Template:Blast Resistance Values

Coal Ore
Template:Blast Resistance Values

Cocoa
Template:Blast Resistance Values

Diamond Ore
Template:Blast Resistance Values

Emerald Ore
Template:Blast Resistance Values

Fence
Template:Blast Resistance Values

Fence Gate
Template:Blast Resistance Values

Gold Ore
Template:Blast Resistance Values
Block name Blast resistance

Hopper
Template:Blast Resistance Values

Iron Ore
Template:Blast Resistance Values

Lapis Lazuli Block
Template:Blast Resistance Values

Lapis Lazuli Ore
Template:Blast Resistance Values

Nether Quartz Ore
Template:Blast Resistance Values

Redstone Ore
Template:Blast Resistance Values

Trapdoor
Template:Blast Resistance Values

Wood Planks
Template:Blast Resistance Values

Wooden Door
Template:Blast Resistance Values

Wooden Slabs
Template:Blast Resistance Values

Wooden Stairs
Template:Blast Resistance Values

Chest
Template:Blast Resistance Values

Crafting Table
Template:Blast Resistance Values

Trapped Chest
Template:Blast Resistance Values

Cauldron
Template:Blast Resistance Values

Wood
Template:Blast Resistance Values

Bookshelf
Template:Blast Resistance Values

Jack 'o' Lantern
Template:Blast Resistance Values

Melon
Template:Blast Resistance Values

Mob head
Template:Blast Resistance Values

Pumpkin
Template:Blast Resistance Values

Sign
Template:Blast Resistance Values

Block of Quartz
Template:Blast Resistance Values

Quartz Stairs
Template:Blast Resistance Values

Note Block
Template:Blast Resistance Values

Sandstone
Template:Blast Resistance Values

Sandstone Stairs
Template:Blast Resistance Values

Wool
Template:Blast Resistance Values

Monster Egg
Template:Blast Resistance Values

Activator Rail
Template:Blast Resistance Values

Detector Rail
Template:Blast Resistance Values

Powered Rail
Template:Blast Resistance Values

Rail
Template:Blast Resistance Values

Clay (block)
Template:Blast Resistance Values

Farmland
Template:Blast Resistance Values

Grass Block
Template:Blast Resistance Values

Gravel
Template:Blast Resistance Values

Sponge
Template:Blast Resistance Values

Brewing Stand
Template:Blast Resistance Values

Button
Template:Blast Resistance Values

Cake
Template:Blast Resistance Values

Dirt
Template:Blast Resistance Values

Ice
Template:Blast Resistance Values

Lever
Template:Blast Resistance Values

Mycelium
Template:Blast Resistance Values

Piston
Template:Blast Resistance Values

Piston Extension
Template:Blast Resistance Values

Pressure Plate
Template:Blast Resistance Values
Block name Blast resistance

Sand
Template:Blast Resistance Values

Soul Sand
Template:Blast Resistance Values

Sticky Piston
Template:Blast Resistance Values

Weighted Pressure Plate
Template:Blast Resistance Values

Cactus
Template:Blast Resistance Values

Ladder
Template:Blast Resistance Values

Netherrack
Template:Blast Resistance Values

Glass
Template:Blast Resistance Values

Glass Pane
Template:Blast Resistance Values

Glowstone
Template:Blast Resistance Values

Redstone Lamp
Template:Blast Resistance Values

Bed
Template:Blast Resistance Values

Daylight Sensor
Template:Blast Resistance Values

Huge Mushrooms
Template:Blast Resistance Values

Leaves
Template:Blast Resistance Values

Snow
Template:Blast Resistance Values

Vines
Template:Blast Resistance Values

Snow (cover)
Template:Blast Resistance Values

Air
Template:Blast Resistance Values

Carrot
Template:Blast Resistance Values

Dead Bush
Template:Blast Resistance Values

Fire
Template:Blast Resistance Values

Flower Pot
Template:Blast Resistance Values

Flowers
Template:Blast Resistance Values

Flowing Lava
Template:Blast Resistance Values

Grass
Template:Blast Resistance Values

Lily Pad
Template:Blast Resistance Values

Locked Chest
Template:Blast Resistance Values

Melon Stem
Template:Blast Resistance Values

Mushrooms
Template:Blast Resistance Values

Nether Portal
Template:Blast Resistance Values

Nether Wart
Template:Blast Resistance Values

Piston Moving
Template:Blast Resistance Values

Potato
Template:Blast Resistance Values

Pumpkin Stem
Template:Blast Resistance Values

Redstone Comparator
Template:Blast Resistance Values

Redstone Repeater
Template:Blast Resistance Values

Redstone Torch
Template:Blast Resistance Values

Redstone Wire
Template:Blast Resistance Values

Saplings
Template:Blast Resistance Values

Seeds
Template:Blast Resistance Values

Sugar Cane
Template:Blast Resistance Values

TNT
Template:Blast Resistance Values

Torch
Template:Blast Resistance Values

Tripwire
Template:Blast Resistance Values

Tripwire Hook
Template:Blast Resistance Values

Typical damage radius[modifica | modifica wikitesto]

The player will receive damage, if within these radii of a 100% exposure ground 1-, 2-, or 4-TNT explosion, with the amount of damage labeled on each circle in the figures below.

KillRadiiGrenade1.png KillRadiiGrenade2.png KillRadiiGrenade4.png

History[modifica | modifica wikitesto]

Classic
0.24 Creepers were first introduced in on August 24, 2009, based on a failed pig model Notch had created.
0.26 (October 24, 2009) TNT was added.
Alpha
1.2 Added Ghasts, which shoot explosive ghast fireballs.
Beta
1.5 Creepers become charged when struck by lightning, increasing the explosion's radius and strength.
1.6 Trying to sleep in the Nether causes the bed to explode.
1.8 Explosions will now emit shockwave particles after exploding. Prior to Beta 1.8, explosions only emitted smoke.
1.9pre3 Bed and ghast explosions cause fire.
1.9pre4 Trying to sleep in the End causes the bed to explode.
Enchantment "Blast Protection" added, protecting against explosions.
1.9pre6 Ender Crystal added, an entity which sits atop of a block of bedrock. It can be destroyed with a melee or hit with an arrow or snowball, causing an explosion.
Sound Update The 'Sound Update' of November 13th 2011 gave TNT a new explosion sound.
rilascio
1.3.1 12w24a Fixed explosions not pushing back players.
1.3.1 Explosions damage the player different amounts on different difficulties, and no damage is dealt to the player on peaceful.
1.4.2 12w34a Added the Wither, which shoots black wither skulls.
12w37a Wither will make a massive explosion upon its creation after its health is fully charged.
Blue wither skulls added.
12w38b New Creeper fall mechanics; Creepers will explode if they fall on the player from a certain height.
1.5 Destroyed blocks have a 1/power chance of dropping as items; previously it was a fixed 30% chance.

Trivia[modifica | modifica wikitesto]

  • Explosions more powerful than 100 look mostly the same from the outside, as only certain lines are used to determine if a block breaks. However, some of those lines continue underground.
  • An explosion powerful enough to break bedrock would have a blast radius of over 30,000,000 blocks. If it were an uninterrupted blast, it would cover 238,775,501.2 blocks. However, explosions only follow certain lines, not every block (see previous).
  • Any explosion going off in flowing water will apply propulsion to entities, but it will not affect any block, whether the blast resistance of that block is low or high.
  • Explosions in or under water won't emit particles.
  • Explosions can redirect projectiles including Ender Pearls.
  • Explosions can break blocks on the other side of blast-resistant blocks that survive.
  • Explosions will propel dead mobs' bodies if they go off just after the mobs dies.
  • If primed TNT explodes in a large, solid cube of stone blocks, it will create an exact 3x3x3 cube inside.

References[modifica | modifica wikitesto]