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I and some friends, we have a Minecraft SMP Server. We use the latest recommended Version of the Bukkit Server.

We dug a 40x40, 3 tiles high cave and placed grass at the bottom. Than we dug water canals and made a lava trap. The problem is that no mobs spawn there. Above the cave there is sand, but I think that doesn't really matter. The fact is that in other places on our server, mobs spawn. Does anyone know why they don't spawn in the cave?

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Mob spawning logic has changed recently (1.8 AFAIK), finding a solution to this may require looking at the code. – fredley Oct 10 '11 at 11:57
The chances are so low, passive mobs may as well not respawn at all in 1.8. I'm afraid you'll just have to tough it out until 1.9 brings Animal Breeding. – Raven Dreamer Oct 10 '11 at 12:29
I think the main problem is that at night animals will spawn in the dark, whereas before they would cluster around lit grass, making it easy to create 'farms'. – fredley Oct 10 '11 at 12:43

Actually, the problem is that the cave has a "ceiling".

[Animals] will always spawn on the highest available block in a column i.e. the one that can see the sky.
Animal Spawning at Minecraft Wiki

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Does this count for all block types? – theorise Oct 10 '11 at 14:02
@theorise: I see no information about that. Non-opaque blocks may be allowed, but it's unlikely. – BlaXpirit Oct 10 '11 at 14:08
Animals only spawn on opaque blocks, so if you make sure that the block (grass) is lit up by sunlight (make a huge hole) and then place glass for a roof, the animals will still spawn on the grass. – Mr Smooth Oct 10 '11 at 21:26
Wasnt this only supposed to be in 1.9?. – Domocus Oct 13 '11 at 15:12
up vote 2 down vote accepted


Yesterday I found a great soultion for my problem: The Mobiile Plugin for Bukkit. It has many options to set your own spawn rules, so that animals can also spawn in the animal farm.

Also it's great for creating a mob filled survival map on the server, just set all mobs to AGGRESIVE and set their spawn rate to 10 percent. =D

I just posted that, because eventually someone could need this informations too.


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