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  1. Minecraft (Bedrock codebase)
  2. MCPE-85747

Ghasts Spawn only at low light levels. Ghast Farms broken.

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    • 376016

      Between 1.14 and 1.16, Ghasts were changed internally from being a "Mob" to being a "Monster". By default, monsters only spawn when the light level is low. (This is hardcoded in the game and cannot be changed by json-based spawning rules).

      Expected Behavior: Ghasts spawn at all light levels.

      Actual Behavior: Ghasts only spawn if the light level is below 8.

      Consequence: Portal-based ghast farms no longer work because portals emit light.

      Demo world: Press a button to switch from a netherwart block floor to a shroomlight floor.

      How to fix: Add a Ghast::isDarkEnoughToSpawn() function that always returns true. Example code below. This wasn't needed before when Ghasts were Mobs, but now is needed because they are Monsters.

      virtual bool Ghast::isDarkEnoughToSpawn() const override {
     return true;
}

        1. ghast_test.mcworld
          5.65 MB

          [MCPE-85747] Ghasts Spawn only at low light levels. Ghast Farms broken.

          Reed Cartwright added a comment - - edited

          I just tested and 1.16.20 is affected by this bug.

          Reed Cartwright added a comment - - edited I just tested and 1.16.20 is affected by this bug.

          Reed Cartwright added a comment - - edited

          The Mob -> Monster change that I'm referring to happened at the C++ level. In 1.14, the Ghast class was derived from the Mob class. In 1.16, it is derived from the Monster class.

          I agree that this bug is likely related to fixing Ghasts not despawning on Peaceful.

          Reed Cartwright added a comment - - edited The Mob -> Monster change that I'm referring to happened at the C++ level. In 1.14, the Ghast class was derived from the Mob class. In 1.16, it is derived from the Monster class. I agree that this bug is likely related to fixing Ghasts not despawning on Peaceful.

          [Mod] GoldenHelmet added a comment - - edited

          This issue may stem from the fix to MCPE-53383. It does not just break certain farms. It also prevents ghasts from spawning over lava oceans.

          Strangely, the following is in the ghast.json for both 1.14 and 1.16:
          "minecraft:type_family":

          { "family": [ "ghast", "monster", "mob" ] }

          ,

          [Mod] GoldenHelmet added a comment - - edited This issue may stem from the fix to MCPE-53383 . It does not just break certain farms. It also prevents ghasts from spawning over lava oceans. Strangely, the following is in the ghast.json for both 1.14 and 1.16: "minecraft:type_family": { "family": [ "ghast", "monster", "mob" ] } ,

            racartwright Reed Cartwright
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