In version 1.10.x, what blocks will mobs voluntarily walk off of, thinking that they are solid blocks?
Minecraft – Which blocks will mobs walk off of voluntarily
minecraft-java-edition
Related Solutions
A pig will voluntarily walk off an edge 3 blocks high, but not an edge 4 blocks high.
To investigate this, I started with @xfs's proof that a pig will not jump off blocks in a 9-patch arrangement if the drop is too high. I then constructed the following apparatus to find the maximum distance a pig would voluntarily jump off:
As you can see, a 2 block drop is fine
A 3 block drop is also fine
At a 4 block drop the pigs no longer jump off voluntarily
Conclusion: The highest drop pigs will drop off voluntarily is 3 blocks
Villagers will not commit suicide without an accomplice, such as a creeper exploding, a zombie pushing them off a cliff, or an enderman enclosing trapping them in a water tube.
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Best Answer
There are few blocks that they (I tested with Zombies lead to Villagers and a 2-block wide pit) will think that are full and aren't. Their AI also makes them not go where they think there isn't a route - that is, even if they could fall off some other types of blocks, their AI won't drive them that way.
Here are some blocks that they count as full-solid:
Trapdoors (both kinds)
Doors (All kinds)
I couldn't find more, no matter what I tried - from Signs through Brewing Stands to Stairs. Nothing more, I guess. On the other hand, watch out for blocks that are solid, but mobs think not - Carpets, Heads, ...