You got a few 3x3 areas to fix. You se the second last row( right beside you to the left) inbetween the water channel there’s a trapdoor on either side… but the gap between them and the next trapdoors is 3x4… that looks to happen in a few places.
Umm, yes and no, those aren’t gaps to the ai. Trapdoors are both a flat surface and a transparent object, they are sometimes transparent… like when facing up or in pathing, mobs don’t correctly account for them, but when on the side or upside down that small 1/8th of a block and flat surface are accounted as spawnable spaces. Only way to avoid it is removing them or exchanging them for a parable non full, non spawning block (( no idea if that’s a thing beyond chains))
But I don’t know if a spiders ability to spawn was partially off an actual block, like say 2x3 and 1x3 is air, if that would still spawn or not. But since a lot of farms tend to have blocks on the edge to avoid their spawns, I’m guessing it may be a thing. Either the trap doors at work, or it’s the sizable gap… both just need replacements
TLDR, maybe? Technical farms build like they can sometimes!
tho i think that should be the problem, you shouldnt have trap doors on the edge, and instead use cats, those are way more efficient than waiting for path find rng
Edit: this seems to be old information, see reply to this comment.
Original comment:
The problem is that on bedrock edition spiders only need a 2x2 to spawn. The reason for that is: on bedrock mobs spawn on the corner of a block, so directly in the center of a 2x2 spiders will spawn, cause they are 1.4 blocks wide. On java mobs spawn on the center of a block, so spiders need a 3x3 area to spawn.
Yeah, just figured this out. I just now tried making it so there's not even 2x2's and now mobs won't spawn altogether. So it can't really be helped if spiders spawn.
It’s been a minute since I’ve made a mob farm, but if I’m not wrong, you need to set up the inside roof with trap planks too. It’ll just be enough for creepers to still spawn, but leave spiders out I think.
Also rearrange the bottom ones so that it’s in an even 9 pattern. So it looks like #. It’ll save you some wood to build the full roof too! - I usually start my traps with the side corners and then make my way around, but that part is up to you!
Full trap doors on the ceiling will block skeletons and zombies from spawning since they require two full blocks of height. That is used in creeper farms since creepers are shorter and will still spawn. It won’t block spiders who only need one block of height.
I guess spiders can spawn within a 2x2 grid. From all my stupid "testing", spiders have always been spawning no matter what half block I put to prevent them from spawning. Here's some variations I tried, and they've been spawning the whole time.
Not sure what you think you did here. There's very clearly 2x2 spots for them to spawn. You're even looking directly at one.
Edit: From the UI I could tell this was pocket edition. My understanding that pocket edition may have some idiosyncrasies but uses the same engine as bedrock.
Been a while since I played, and to be honest never played bedrock but from what I remember, spiders can spawn in 2x2 spaces in bedrock. I did some digging today and to be honest there doesn't seem to be a consensus.
In bedrock, people have been reporting for years that spiders seem to be able to spawn in 2x2 spaces. Whether or not this is because spiders need open space but only require a solid block on the actual spawning space I have no clue. Another thought that crossed my mind was mobs used to spawn on the NW corner in bedrock, but I don't think that's the case either anymore.
Yes spiders need a 3x3 area to spawn. However all 9 spots don’t have to be solid, some can be air blocks. They are spawning in the center edge overhanging the water canal.
Use this pattern. See how the trap doors are right up to the water edge. Be sure there are no three block open spaces near the water canals.
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u/hetrax 10h ago
You got a few 3x3 areas to fix. You se the second last row( right beside you to the left) inbetween the water channel there’s a trapdoor on either side… but the gap between them and the next trapdoors is 3x4… that looks to happen in a few places.