I was wondering what specific blocks a mob can spawn on, and which ones they can't. I know that block "opacity" and "transparency" have a part to play, but not all of these rules apply properly.
Can someone generate a list of all the blocks a mob (and if there is a difference between hostile/passive mob) can spawn on?
Is there any restriction for a player?
23 Answers
A player can spawn on any solid block which is not affected by gravity and is below the sky, so there are no blocks above it.
Animals spawn on grass or dirt exclusively (block id 2 and 3). They also require a light level above 9 and at least 2 blocks of air above them. Exception is the bat, which spawns on opaque blocks if the light level is below 9.
Skeletons, Zombies, and Creepers can spawn on any opaque block if the light level is below 7. Exception are mobs in the nether, which can spawn on netherrack, no matter what the light level is.
Opaque blocks include:
1 --> Stone 1:1 --> Granite 1:2 --> Polished Granite 1:3 --> Diorite 1:4 --> Polished Diorite 1:5 --> Andesite 1:6 --> Polished Andesite 2 --> Grass 3 --> Dirt 3:1 --> Coarse Dirt 3:2 --> Podzol 4 --> Cobblestone 5 --> Oak Wood Plank 5:1 --> Spruce Wood Plank 5:2 --> Birch Wood Plank 5:3 --> Jungle Wood Plank 5:4 --> Acacia Wood Plank 5:5 --> Dark Oak Wood Plank 12 --> Sand 12:1 --> Red Sand 13 --> Gravel 14 --> Gold Ore 15 --> Iron Ore 16 --> Coal Ore 17 --> Oak Wood 17:1 --> Spruce Wood 17:2 --> Birch Wood 17:3 --> Jungle Wood 35 --> White Wool 35:1 --> Orange Wool 35:2 --> Magenta Wool 35:3 --> Light Blue Wool 35:4 --> Yellow Wool 35:5 --> Lime Wool 35:6 --> Pink Wool 35:7 --> Gray Wool 35:8 --> Light Gray Wool 35:9 --> Cyan Wool 35:10 --> Purple Wool 35:11 --> Blue Wool 35:12 --> Brown Wool 35:13 --> Green Wool 35:14 --> Red Wool 35:15 --> Black Wool 41 --> Gold Block 42 --> Iron Block 43 --> Double Stone Slab 43:1 --> Double Sandstone Slab 43:2 --> Double Wooden Slab 43:3 --> Double Cobblestone Slab 43:4 --> Double Brick Slab 43:5 --> Double Stone Brick Slab 43:6 --> Double Nether Brick Slab 43:7 --> Double Quartz Slab 45 --> Bricks 47 --> Bookshelf 48 --> Moss Stone 49 --> Obsidian 56 --> Diamond Ore 57 --> Diamond Block 78 --> Snow 80 --> Snow Block 87 --> Netherrack 97 --> Stone Monster Egg 97:1 --> Cobblestone Monster Egg 97:2 --> Stone Brick Monster Egg 97:3 --> Mossy Stone Brick Monster Egg 97:4 --> Cracked Stone Brick Monster Egg 97:5 --> Chiseled Stone Brick Monster Egg 98 --> Stone Bricks 98:1 --> Mossy Stone Bricks 98:2 --> Cracked Stone Bricks 98:3 --> Chiseled Stone Bricks 99 --> Brown Mushroom Block 100 --> Red Mushroom Block 159 --> White Stained Clay 159:1 --> Orange Stained Clay 159:2 --> Magenta Stained Clay 159:3 --> Light Blue Stained Clay 159:4 --> Yellow Stained Clay 159:5 --> Lime Stained Clay 159:6 --> Pink Stained Clay 159:7 --> Gray Stained Clay 159:8 --> Light Gray Stained Clay 159:9 --> Cyan Stained Clay 159:10 --> Purple Stained Clay 159:11 --> Blue Stained Clay 159:12 --> Brown Stained Clay 159:13 --> Green Stained Clay 159:14 --> Red Stained Clay 159:15 --> Black Stained Clay 179 --> Red Sandstone 179:1 --> Smooth Red Sandstone 179:2 --> Chiseled Red Sandstone I hope I didn't forget any, if I did, feel free to add them.
9All transparent blocks, with the exception of slime blocks, redstone blocks, and active redstone ore (when glowing after being hit), cannot be spawned upon.
A full list of the transparent blocks that no monsters spawn on:
Furnace (when active) Glass Glowstone Ice Jack o'Lantern Leaves (Fancy graphics) Piston (Retracted) Redstone Lamp (when active) Redstone Ore (when active) Sticky Piston (Retracted) TNT Anvil Bed Brewing Stand Cake Carpet Cauldron Chest Cobblestone Wall Daylight Sensor Door Enchantment Table Ender Chest Farmland Fence Fence Gate Glass Pane Iron Bars Ladder Lily Pad Nether Brick Fence Piston (Extended) Redstone Repeater Redstone Comparator Snow (layer) (2 - 8 layers) Sticky Piston (Extended) Trapdoor Trapped Chest Vines Button Lever Pressure Plate Weighted Pressure Plate Rail Powered Rail Detector Rail Activator Rail Redstone Dust Redstone Torch Air End Portal Fire Portal Sign Snow (cover) (single layer) Torch Cactus Crops Flowers Grass Mushrooms Saplings Sugar Cane Lava Water End Portal Frame Mob Spawner Exceptions that are both transparent and spawnable upon:
Block of Redstone Hopper Slime Also other notable exceptions:
Slabs not aligned with the top of the block-space (normal) cannot be a spawning are. Slabs aligned with the top/double slabs can be spawned upon.
Right-side-up stairs (stair side up) cannot be spawned upon, upside down one can (flat side up).
3Been testing on creative, MC 1.10.
Tested the tranparent blocks list above and so far Jack-o-lanterns will spawn mobs. AFAIK, Jack-o's aren't transparent anyhow. They just behave differently. They also emit a light level of 14 (?) so in the overworld, hostiles wont spawn?
Add to lists of spawnable blocks: Pistons (sticky or otherwise, retracted or extended), and string
Spawn through blocks (mobs don't spawn on them but they can spawn through them, i.e. on the block said block is on.): Signs, Torches
(Test are in nether, above bedrock, at highest level, or at least 2 blocks below that coz there's no light in 256)
