How do you detect the nearest Slime Chunk or Mob Spawner?

[meee39]

What I want is something like Eye Of Slime that flies to the nearest Slime Chunk or Swamp. Or an Eye Of Skeleton that flies to the nearest Skeleton Dungeon or Skeleton Spawner.

[Choonster]

Look at EntitySlime#getCanSpawnHere (specifically the last if statement) to see how it determines whether the chunk it's currently in is a slime chunk. You'll need to iterate outward through all chunks surrounding the current position until you find one.

 

Minecraft records the positions of large structures like Nether Fortresses or Strongholds (that use the MapGenStructure system), but it doesn't record the positions of smaller structures like Dungeons (that use Vanilla's WorldGenerator or Forge's IWorldGenerator systems). @diesieben07 explained how to search for a TileEntity in a Chunk in the post linked below, you can use this method to find nearby mob spawners.

 

 

Edited June 2, 2017 by Choonster