The bug
When you jump and place a fence post under you you will get inside off the fence post.
Note: This works correctly for fence gates and cobblestone walls.
Code analysis
Based on 1.11.2 decompiled using MCP 9.35 rc1
The class BlockFence is not overriding the method net.minecraft.block.Block.getCollisionBoundingBox(IBlockState, IBlockAccess, BlockPos) and therefore returns the hitbox instead of the collision box.
Related issues
is duplicated by
MC-18775
Stuck in Fence
MC-21717
Glitch Through fences
MC-32506
Fall inside of fence
MC-36037
Fence posts
MC-41081
Fence Occlusion
MC-48728
Minecraft 1.7.4 - Fence Hitbox Glitch?
MC-50003
Noclip Fences
MC-51062
Fences are placeable while jumping
MC-64166
Fences are Temporarily Non-Solid when Placed directly beneath player
MC-70017
Falling through fence if placed on side of a Block while crouching
MC-70856
Able to jump and place a fence which causes a character to be stuck in a fence
MC-73075
Fences are ghosts that you can see
MC-79411
When placing down a fence (any wood type) and flying down to it quickly, you get inside it.
MC-79666
Can jump inside fences while placing
MC-91474
Fence hitbox error?
MC-92766
A hitbox glitch I don't see going away any time soon
MC-131147
An error with the fences
relates to
Attachments
Comments
migrated
kumasasa
Confirmed.
Ouch. That looks like it hurt. (Sic!)
migrated
Confirmed
migrated
Affects 13w42b
migrated
Affects 14w04a
migrated
Confirmed for 14w21b.
migrated
Confirmed for 1.8.1-pre2.
Suggested fix for the devs:
Replace the 1.5 block high collision box of the fence with a 1 block high one that matches the visual shape, and then add an invisible 0.5 block high collision box on top. This will not be a perfect solution, it just means that if a player manages to fall through the top 0.5 block section, they will be standing on what is effectively a 1 block high internal support platform. Due to the fact that the fence is only visually 1 block high anyway, this would mean a player wouldn't even appear to be inside the fence.
migrated
Confirmed in 1.8.3. The fact that you can fall though it is intended, you are inside the fence's hitbox, and that is how crouching works. The actual bug is that you can place the fence there in the first place. The game should detect that the block would intersect your hitbox and should prevent the placement like it does with other blocks.
marcono1234
Confirmed for
15w49b
JUE13
I can confirm that this is fixed at approximately 17w50a.