Affects Version/s: Minecraft 1.7.9, Minecraft 14w19a, Minecraft 14w21b, Minecraft 1.7.10, Minecraft 14w28a, Minecraft 14w29a, Minecraft 14w29b, Minecraft 14w30c, Minecraft 14w31a, Minecraft 14w32d, Minecraft 14w33c, Minecraft 14w34b
Fix Version/s: Minecraft 14w34d
Hostile Mobs will not spawn at certain heights if the darkness they would spawn in is caused by the night. So if the skylight is 0 mobs WILL spawn at these heights.
The heights are:
16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240
(basicly every 16*n)
I guess this is due to the fact that Chunks are split up vertically in parts with the height of 16. So the problem occurs if a mob spawns inside one part, but the block it spawns on is inside the part below.
How to reproduce:
2. Create new World
3. Gamemode: Creative
4. More World Options...
5. World Type: Superflat
8. paste the following preset into the box at the top: 3;64*minecraft:stone;1;
9. Use Preset
11. Create new World
12. set the time to night (/time set 18000)
No mobs will spawn!
You can use the preset 3;63*minecraft:stone;1; or 3;65*minecraft:stone;1; instead and they will spawn.