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El bloque de generador de monstruos sólo se puede obtener a través del uso {{cmd|give}} y de {{cmd|setblock}}. En Pocket Edition, están disponibles en el inventario de creativo. Los generadores obtenidos con {{cmd|give}} siempre sacan cerdos cuando se coloca. Los generadores que crean otras entidades se pueden colocar con el {{cmd|setblock}}. Ejemplo de comando: {{cmd|setblock ? ? ? mob_spawner 0 replace {EntityId:"Cow"} }}
== Localización ==
En la [[dificultad]] Pacífica, los generadores de monstruos seguirán apareciendo, pero los mobs hostiles generados desaparecerán en el mismo momento en el que son generados (los [[hombrecerdo zombi]], los [[Ghast]] y los [[cubo de magma|cubos de magma]] tampoco se generarán). Esto hace que sea fácil preparar trampas para generadores sin ser molestado por los mobs. Aunque en dificultad Pacífica los mobs desaparecen al instante tras ser generados, el tiempo es suficiente para que el jugador sea empujado por un mob o que a un esqueleto generado le dé tiempo de lanzar una flecha.
==Generador==
{| class="wikitable"
|+ Summary of maximum spawn volumes for common monster spawners
|-
! Mob type
! Required Volume
! Failure rate from 8×8×4 volume<ref group="note">8×8×3 is the actual volume across which spawners spawn entities, but this volume only contains the entity's ''center''. The failure rate assumes 8×8×4 because it is a popular misconception that 8×8×4 is the maximum efficiency volume of empty space for mob spawners - it actually depends on the size of the entities themselves. Note that 10x10x4 is '''guaranteed''' to accommodate all of the above mobs. Also note that this failure rate only accounts for failures due to attempting to spawn a mob at the edges of the spawn range, not other causes of failure such as mobs attempting to spawn intersecting the spawner block itself.</ref>
! Vertical<br>alignment
|-
| {{EntityLink|Pig}}
| 8.9 × 8.9 × 2.9
| 2.531252%
| {{BlockGrid|s=Monster Spawner|a=Cauldron+top|a|s|a}}
|-
| {{EntityLink|Cave Spider}}
| 8.7 × 8.7 × 2.5
| 1.531252%
| {{BlockGrid|s=Monster Spawner|a=Cauldron+top|a|s|a}}
|-
| {{EntityLink|Silverfish}}
| 8.3 × 8.3 × 2.7
| 0.28125%
| {{BlockGrid|s=Monster Spawner|a=Cauldron+top|a|s|a}}
|-
| {{EntityLink|Zombie}}<br>{{EntityLink|Skeleton}}<br>{{EntityLink|Blaze}}
| 8.6 x 8.6 x 3.8
| 1.125%
| {{BlockGrid|s=Monster Spawner|a=Cauldron+top|a|a|s|a}}
|-
| {{EntityLink|Spider}}
| 9.4 × 9.4 × 2.9
| 6.125%
| {{BlockGrid|s=Monster Spawner|a=Cauldron+top|a|s|a}}
|}
<references group="note"/>
For all of the volumes listed in the table, the horizontal plane is centered on the northwestern corner of the spawner block. While the spawning volume for pigs is 8.9 × 8.9 × 2.9, the requirement of grass blocks that are necessary for pigs to spawn will reduce the actual volume in which they successfully spawn.
The block will attempt to spawn 4 mobs at randomly chosen points within the spawning area, then wait anywhere from 200 to 799 ticks (10 to 39.95 seconds) before spawning again. As it waits, the mob inside the block will spin faster and faster. Except for spawning on a solid block, all of the usual requirements for spawning must be met (not in a solid block, correct light level, etc.), so the spawner will often produce fewer than 4 mobs. When it does spawn, it will "poof", and more lightless flames will temporarily appear around the Spawn block. If the block fails to spawn any mobs because it did not pick any suitable locations, it will repeat this process every [[tick]] until it succeeds. Only when it manages to spawn at least one mob will it start waiting for the next cycle. If, at the time of spawning, 6 or more monsters of the block's type are present within a 17 × 9 × 17 area (17 wide and 9 high and 17 long), centered on the spawner block, the spawner "poofs" without creating any monsters and then waits for the next cycle. However if the monsters created by the spawner keep leaving the specified area then the monster spawner will continue spawning mobs indefinitely, provided the player is still within range.
In [[Peaceful]] [[difficulty]], Monster Spawner blocks will still appear, but any spawned [[hostile]] mobs will disappear the instant they spawn. ([[Zombie Pigmen]], [[Magma Cubes]], and [[Ghasts]] will not spawn at all.) This makes it easy to make the traps without being troubled by the mobs. The brief instant that the monster exists in the world before being removed is enough time for the player to be pushed around, for the sound file to play, and occasionally for Skeletons to fire arrows.
=== Detailed spawning algorithm ===
This pseudo-code is derived from the decompiled source of 1.4.2.
<pre>
every spawn cycle (every randInt(200,799) ticks when a player is within
17 blocks of the spawner),
loop 4 times {
if there are 6 or more of the mob type in the 17x9x17 area around the spawner,
skip this spawn cycle
calculate spawnerX = X coordinate of center of spawner - 0.5
calculate spawnerY = Y coordinate of center of spawner - 0.5
calculate spawnerZ = Z coordinate of center of spawner - 0.5
calculate x coordinate of mob = spawnerX + (randDouble() - randDouble()) * 4,
randDouble being a random number between 0 and 1
calculate y coordinate of mob = spawnerY + a random integer between -1 and 1
calculate z coordinate of mob = spawnerZ + (randDouble() - randDouble()) * 4,
randDouble being a random number between 0 and 1
if all of the conditions specific to the mob type are met, spawn the mob {
chicken, cow, horse, mooshroom, pig, sheep, villager, wolf:
block below spawning block is grass
spawning block has a light level of 9 or higher
ocelot:
pass a 2/3 random test
block below spawning block is grass or leaves
on layer 63 or higher
creeper, enderman, skeleton, spider, cave spider, zombie:
light level 7 or less
blaze:
light level 11 or less
silverfish:
light level 11 or less, or on Stone blocks
no players within 5 blocks
slime:
difficulty is not set to peaceful or slime size is small
either:
spawn block y coordinate is less than 40
the chunk containing the spawn block is a slime chunk (1 in 10 chance)
pass a 1 in 10 random test
or:
swamp biome, layer 51 through 69, light level 7 or less
ghast:
pass a 1 in 20 random test
squid:
must not collide with any other entities
must be in layer 46-62
giant:
light level 7 or less
light level 8 or more
(since these conditions can't be true simultaneously, giant spawners don't work)
all except squid and slimes:
must not collide with any blocks or other entities
must not collide with water or lava
}
}
if all 4 mobs failed to spawn, repeat on the next tick
</pre>
== Curiosidades ==
