I silk touched several hostile spawners, now I am ready to build a hostile mob farm. The server I am on has a very short distance for active chunks, so I need to figure out of a very compact arrangement for the spawners.
Things I already know (or think I know):
I need to place all the spawners on the same side of where I will stand. I.e.: <Spawners> - - - <me> - - - <fishing pond and skeleton/zombie drop/kill area>. This is because I have plans for storage, crafting, etc in the other directions and still within "active" range.
I know that some (all?) spawners spawn mobs within a 9x9x3 volume centered on the spawner.
I've built some efficient spider, skeleton and zombie single-spawner rigs for both XP and drops, as well as water-based mob-transport systems. So, I already understand the basics.
Things I don't know:
If I place spawners next to each other, do I get a proportional increase in number of mobs? So that if I have say 4 spawners touching each other in a row in a 12x9x3 space, do I get 4 times the mobs (or nearly that)?
If I place 9x9x3 spawning boxes over each other (with floor/ceiling separation) do they interfere with each other's spawn rates?
Are there any other non-trivial/not-obvious design things I should be aware of?
Hard to advise you on the specific mechanics of spawner placement when in vanilla minecraft, you can't silk touch spawners and pick them up and place them...and if you do somehow manage to place a spawner, it becomes a pig spawner, no matter what it was before. What mod/plugin are you using that lets you do this? There may be multiple such mods available, with slightly different mechanics.
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Multiple spawners near each other will interfere if they are spawning the same type of mob because they only spawn more mobs if there are less than 6 of the same type of mob being spawned within a 9x9x9 area centered around the spawner; see the Wiki for details. Also, other mobs will cause obstructions because mobs can't spawn on top of other mobs, so you want to remove them as quickly as possible for both reasons; otherwise a mob spawner will only obstruct spawning within the block it occupies so placing two next to each other will spawn mobs at nearly the same rate as two spawners separated by their spawning ranges; I believe they can be the same type of mob since they only check to see if there are too many mobs nearby when they attempt to spawn them and the spawning cycles have random delays, so it is unlikely they will both try to spawn mobs at the same time and if they do they will spawn at different times the next time. Note that mobs spawned from spawners can spawn in midair, so you can place the spawners then remove the supports and they will drop down to a collection area below.
All this is assuming they have the default vanilla spawning behavior; you can also place the spawners up to 32 blocks apart and still be close enough to activate them as they have a 16 block player detection radius (spherical, so be sure to verify they work if you place them apart).
You could try towering them: Have a spawner in the middle of the room with water flowing towards the edges. The ceiling will be the floor of the next spawning room, with water flowing to the edges above too. At least five blocks will be needed for each room, or more if mobs get stuck on each other. The sides of the entire spawning room should be cut out 1 to 2 blocks so mobs can fall down.
You could try towering them: Have a spawner in the middle of the room with water flowing towards the edges. The ceiling will be the floor of the next spawning room, with water flowing to the edges above too. At least five blocks will be needed for each room, or more if mobs get stuck on each other. The sides of the entire spawning room should be cut out 1 to 2 blocks so mobs can fall down.
This is pretty much what I did. 3 spawner rooms (zombie, skeleton and spider) over each other, each having 5 spawners side by side in the center and built on a slight variation from the design in this video: http://www.planetminecraft.com/project/cave-spider-xp-farm-tutorial/.
Skeleton and zombie flow out of the rooms, join up in an elevator that takes them at least 20 levels up, then drops them 20 levels to a kill block with their top half enclosed... where I finish them off (XP grind plus goodies). A 2-wide area around the kill block is floored with hoppers feeding into chests. The chests empty down into hoppers and into further chests - fewer at each level, eventually down to 1 chest where I collect the goodies. Why so many chests? So that it takes longer to fill up, and so that I only have to sort and store at most once a day.
Spiders go to an automated drowner and a water flow collects the goodies and through a hopper drops them into a chest. (I still need to fix the water channels as the spiders are getting stuck somewhere)
All of the rooms have several redstone lamps on the ceiling so that I can turn off the spawners for maintenance if needed.
Things I already know (or think I know):
All this is assuming they have the default vanilla spawning behavior; you can also place the spawners up to 32 blocks apart and still be close enough to activate them as they have a 16 block player detection radius (spherical, so be sure to verify they work if you place them apart).
TheMasterCaver's First World - possibly the most caved-out world in Minecraft history - includes world download.
TheMasterCaver's World - my own version of Minecraft largely based on my views of how the game should have evolved since 1.6.4.
Why do I still play in 1.6.4?
/setblock <x> <y> <z> minecraft:mob_spawner 0 replace {EntityId:"<Name>}
For the part that says name, just put in the name of the mob, eg. Zombie, WitherBoss, Creeper, Cow, etc.
一切是真棒!
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This is pretty much what I did. 3 spawner rooms (zombie, skeleton and spider) over each other, each having 5 spawners side by side in the center and built on a slight variation from the design in this video: http://www.planetminecraft.com/project/cave-spider-xp-farm-tutorial/.
Skeleton and zombie flow out of the rooms, join up in an elevator that takes them at least 20 levels up, then drops them 20 levels to a kill block with their top half enclosed... where I finish them off (XP grind plus goodies). A 2-wide area around the kill block is floored with hoppers feeding into chests. The chests empty down into hoppers and into further chests - fewer at each level, eventually down to 1 chest where I collect the goodies. Why so many chests? So that it takes longer to fill up, and so that I only have to sort and store at most once a day.
Spiders go to an automated drowner and a water flow collects the goodies and through a hopper drops them into a chest. (I still need to fix the water channels as the spiders are getting stuck somewhere)
All of the rooms have several redstone lamps on the ceiling so that I can turn off the spawners for maintenance if needed.
Thanks to all for the advice.