I have a Monster Spawner block that has been set to spawn squids. How do I have to place it for it to spawn them?
Minecraft – What conditions are needed for squid Monster Spawner block to work
minecraft-java-edition
Related Solutions
The conditions shown in your screenshot should be able to spawn pigs, assuming it's a pig spawner. I did a rough recreation of your setup in my world.
Even in the dark, pigs were spawning, and within seconds of placing the spawner, so it's not as if you aren't waiting long enough. (Yes, the pigs also spawned when I surrounded the spawner with Glowstone). Because of this, I have a feeling that the spawner in your image isn't actually a pig spawner; it's likely a zombie spawner, or some other hostile mob. This is especially likely if you found the spawner and it wasn't manually placed by anyone, since there wouldn't be any natural pig spawners around.
Like Kevin Reid said, you could test this by making the room dark and seeing if any hostile mobs spawn. If you have admin privileges (and don't feel like this is cheating in some sort of way), you could use /give 52 1 to give yourself an actual pig spawner, place it in the room, and see if that one spawns pigs, just to verify if this is an odd SMP glitch that is only happening for you.
Looking at the source code, near a portal means on the base of the obsidian portal frame. The pig zombies will also look in a completely random direction.
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Best Answer
A spawner will attempt to spawn mobs at random locations inside a cuboid with side lengths of 9 blocks in both horizontal directions and a height of 3 blocks.
Thank you to IQAndreas for this additional information:
For the mob to actually spawn, this randomly chosen location must meet certain criteria, otherwise no mob is spawned at this location.
The criteria for squids are:
If there is at least one block inside that cuboid that meets these criteria, it is possible for squids to spawn.
Reference: Minecraftwiki article "Monster Spawner"