[MC-9704] Sometimes randomly unable to place ladder while standing in the same block Created: 13/Feb/13  Updated: 16/Jan/24  Resolved: 24/Dec/17

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Minecraft 1.4.7, Snapshot 13w06a, Snapshot 13w11a, Minecraft 1.5.1, Minecraft 1.5.2, Snapshot 13w18c, Snapshot 13w19a, Minecraft 1.7.5, Minecraft 14w11b, Minecraft 1.8, Minecraft 1.8.1-pre2, Minecraft 1.8.8, Minecraft 15w49b, Minecraft 1.10.2, Minecraft 1.12.1, Minecraft 1.12.2
Fix Version/s: Minecraft 17w47a

Type: Bug
Reporter: Thue Assignee: Unassigned
Resolution: Fixed Votes: 8
Labels: block, ladders, place

Attachments: File bugged.mp4     File fixed.mp4    
Issue Links:
Duplicate
is duplicated by MC-44457 Ladder Placement and Hitboxes Resolved
Relates
relates to MC-491 Ladders breaking glitching out Resolved
CHK:
Confirmation Status: Confirmed

 Description   

The bug

Sometimes randomly unable to place ladder while standing in the same block.

The cause

The issue is that ladders are solid, and the hitbox detection upon being placed accounts for when it's facing north (or when it's facing south?), regardless of what direction it's actually going to be facing when placed. (I did not look at the code, this assumption is just from lots of testing.)

This means not only can you wind up being unable to place a ladder due to occupying the space of the north- (or south?-) facing hitbox, but also being able to place a ladder when you're right up against the wall you're placing it on, due to not occupying the space of the north(/south?) hitbox.

Video demonstrating the issue.



 Comments   
Comment by Neliz_ [ 16/Jan/24 ]

I can confirm this has been fixed in 17w47a and attached two videos: one demonstrating a fixed version, the other demonstrating a bugged version.

Comment by [Mod] Michael Wobst [ 24/Dec/17 ]

Can no longer reproduce in 17w50a. Apparently this got fixed in some 1.13 snapshot.

Comment by Zwip-Zwap Zapony [ 22/Jul/16 ]

This still happens in 1.10.2. The issue is that ladders are solid, and the hitbox detection upon being placed accounts for when it's facing north (or when it's facing south?), regardless of what direction it's actually going to be facing when placed. (I did not look at the code, this assumption is just from lots of testing.)

This means not only can you wind up being unable to place a ladder due to occupying the space of the north- (or south?-) facing hitbox, but also being able to place a ladder when you're right up against the wall you're placing it on, due to not occupying the space of the north(/south?) hitbox.

Comment by kbk [ 07/Dec/15 ]

Yes, easily reproducible in latest snapshot (15w49b). Seems to be endemic to ladders as vines, torches etc are placed for sure.

Comment by Kumasasa [ 06/Dec/15 ]

Is this still an issue in the current Minecraft Snapshot 15w49b or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Comment by [Mod] Sonicwave [ 13/Oct/14 ]

Confirmed for 1.8 and 1.8.1-pre2.

Comment by Tim Gunderson [ 26/Mar/14 ]

I've had it happen very inconsistently on 14w11b. Screenshot of circumstances with F3: https://bugs.mojang.com/secure/attachment/60449/2014-03-26_00.20.32.png

Edit: Corrected version number.

Comment by kbk [ 18/Mar/13 ]

Yep, still can confirm in 13w11a.

Comment by kbk [ 13/Feb/13 ]

Can confirm in 13w06a. Could not recreate with vines and other attachable blocks - only ladders seem to behave that way.

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