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  1. Minecraft (Bedrock codebase)
  2. MCPE-153502

Failed slime spawning attempts greatly reduce spawning rates for other mobs

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Details

    • Bug
    • Status: Open
    • Resolution: Unresolved
    • 1.18.12 Hotfix, 1.18.31
    • 1.19.10.20 Preview
    • None
    • Confirmed
    • Multiple
    • 758879

    Description

      Despite the fact Slimes are only supposed to spawn in slime chunks at Y<40 and swamps at Y=<70, spawns are attempted by the game in every biome, every tick, with a weight of 100.

      As a consequence, spawning rates for other mobs, especially mobs with a low spawning weight, are greatly impacted in a negative way. This is especially clear with certain passive mobs.

      As an example of this behavior, here is a video using turtles in a beach biome.
      The left side of the video shows plain vanilla Minecraft.
      The right side of the video uses a behavior pack which limits slime spawns to Y<40 in all biomes but swamps, where the upper limit is set to Y=70.

      The results should speak for themselves.
      In vanilla Minecraft, during the 5 minutes of the test, only 3 turtles were successfully spawned.
      With the adjusted behavior pack, 33 successful spawns were recorded in the same amount of time.
      Demonstration video

      Proposed solution:
      Modify Slime spawning rule JSON to include a spawning height limit of 39 in all biomes but swamps, where the limit should remain 70.

      Edit:
      After testing the pack uploaded by ArchThunder and confirming it produces similar results as the one I initially attached, I decided to remove mine in favor of theirs. ArchThunder's pack is very close to the concise version proposed by GoldenHelmet.

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              Oare Syo Ronpo
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                Updated:
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