Very few mobs are spawning on the surface or in the dark despite being on hard mode and having a room dedicated to spawning mobs. I've been led to believe from various sources that this is due to mobs spawning underground in caves I haven't found yet, filling the mob cap for the chunks and not allowing mobs to spawn on the surface, or in a dark room. This is especially troublesome because I've read various claims that the mobs don't seem to despawn, (depending on the circumstances), which don't allow specialty mobs to spawn at the right time; an example being slimes in the swamp or mooshrooms on mooshroom island. Effectively, this forces the player to find all the caves in a given area and light them up till mobs start to have no choice but to spawn on the surface again. This is especially frustrating because there's no way to know where every cave is; effectively making it an easter egg hunt; which isn't fun and lowers my interest in playing. Please fix this spawning issue because you've literally deleted the legacy console edition off the marketplace and given me no choice but to try and enjoy this version. Update: After the 1.11.0 update I'm still seeing a lack of slime spawn in the swamp, (despite being the correct light level and moon phase). In fact I haven't seen any new slime spawn in the swamp, both dark room and the normal swamp. I lit up some mines to allow some mobs to spawn on the surface, however, even in raids, it seems the illagers, witches, etc are spawning underground as well. I'll provide any information or evidence required to fix this.
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Tacman215
Light does effect slime spawn. Slimes don't spawn past light level 7 and even at light levels 7 or under the slimes have a 50%chance to spawn. I made to sure to check before I posted the thread
GoldenHelmet
Essentially your report duplicates MCPE-21856 and MCPE-45183.
You can get a lot of information reading through the comments to those, as well as
MCPE-41273, MCPE-59682, and MCPE-60552.
The spawn rules for Bedrock are complex and sometimes counterintuitive. Lighting up caves should have nothing to do with the surface spawns because there are two different density caps. However, due to MCPE-59682 in the current version, nothing will spawn under trees, so I'd suggest clearing trees and maybe expanding the dirt surface in your swamp to get slimes. You are correct that surface slime spawns in swamps are affected by light. These spawn in Y=50-70. The deep slime spawns in slime chunks, however, are not affected by light. These spawn at Y=0-40. If you make an enclosed room to spawn surface-level slimes in, just put carpet on top of the roof and then the game will then treat the floor of the room as "surface," and it will not be affected by the cave mob density cap.
[Mod] OcelotOnesie
Thank you for your report!
We're already tracking this issue at MCPE-21856, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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light levels dont affect slime spawns. also, the spawn rate for slimes in swamps is naturally crazy low. on a flat plane, like 1 every 5 minutes. and thats in a radius of about 100 meters... so if your not planning on building a massive farm, youl just have to be patient or find a "slime chunk".