Just a quick question I guess, regarding farm animals since the 1.1 update a few days ago. Ever since finally getting 16 sheep in a "pen" and dyeing them all colors they seem to keep escaping from the pen. It only happens when I breed or re-log into minecraft so I assume its something to do with getting stuck in the walls maybe?
Picture of the pen:
They used to all cluster around the pen door due to their path finding, but now I've sealed them all in. It also used to be a cobblestone hut that they were in, but escapes were more frequent?
Maybe someone can help me identify the problem, and maybe come up with a solution?
I have read that double wide fences work "better" than double high. I have done either double wide single high fences, or single wide with lower or only level surrounded outside with dirt blocks, and my cows never escaped. They do look like they are standing on the fence sometimes, but hostile mobs also appear to no-clip though single layer ceilings sometimes.
Sheep I just breed in the wild. And now that they regrow wool (rather quickly), you can clip them several times in a short period of time (if they have grass to feed on).
So I don't think it is fence height that matters as much as thickness.
When I breed animals of any kind, I just start by collecting the animals I want in a 2x2x2 hole (1 per hole, so i'll usually end up with about 4 holes to begin with) then expanding until its a big enough place, then I just release the animals into the massive X by Z by 2 hole.
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As i understand it, the issue involves the fences. Unlike a solid block, the sheep can try to spawn there ( when you log in, come back etc.) When the decision is made by the game it has to decide on which side of the fence to place the sheep - using the fence block space.
Sometimes the game chooses the out side of the fence.
Block the fence in or use blocks 2 high.
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When you log in, you reload the chunk with the entity data for the chunk. (Entity data is the number, type, and location of all the mobs and item drops in a chunk.) Sometimes the game tries to place the entity directly on a block that already has a space-occupying transparent block on top of it. The game will then randomly assign the entity to the next available block, whether inside or outside of the fence. This is how sometimes you can have sheep in a room made of solid rock walls and still have some sheep appear wandering around outside the room.
Two tricks you can try:
1. Make the fences of your enclosure follow the outer border of the chunk exactly. All the grass blocks inside the fenced area belong to the same chunk. On reload, that chunk will relocate entities primarily inside the fence.
2. Make the fences 2 or even 3 layers wide and at least 2 layers high. Better yet, do both: carve out a room in solid stone underground, that corresponds exactly with a chunk or series of adjacent chunks, making sure the wall is 2 thick on all sides, ceiling, and floor. Build a ramp of dirt down inside, grass it in nicely, lead sheep down inside with wheat, breed them there, and then seal the roof.
BTW this seems to happen a lot LESS with cows because perhaps they have a larger hitbox. The key here is to make sure when the chunks are reloaded, sheep stay put and cannot be moved to another chunk.
If you want to keep your sheep from escaping, I would recommend either making your fence taller, or use something other than wooden fences, such as iron bars. I would NOT use cactus as a fence, because sheep can take damage or even die from touching them. I usually use iron bars as a fence. Hope this helps. And by Iron Bars, I mean NOT THE INGOT FORM.