[MC-3004] Can walk through piston arm if piston placed facing east (f = 3) Created: 14/Nov/12  Updated: 21/Jan/16  Resolved: 05/Nov/15

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Minecraft 1.4.4, Minecraft 1.4.6, Minecraft 1.4.7, Snapshot 13w04a, Snapshot 13w06a, Snapshot 13w07a, Snapshot 13w09a, Snapshot 13w10b, Minecraft 1.5, Minecraft 1.5.1, Minecraft 1.5.2, Minecraft 1.6.2, Minecraft 1.7.4, Minecraft 14w02c, Minecraft 14w03b, Minecraft 14w04a, Minecraft 14w04b, Minecraft 1.7.5, Minecraft 14w11b, Minecraft 1.7.6-pre1, Minecraft 1.7.6-pre2, Minecraft 1.7.9, Minecraft 14w20b, Minecraft 14w21a, Minecraft 14w21b, Minecraft 1.7.10, Minecraft 14w30c, Minecraft 14w33c, Minecraft 14w34a, Minecraft 14w34b, Minecraft 14w34c, Minecraft 14w34d, Minecraft 1.8-pre1, Minecraft 1.8-pre2, Minecraft 1.8, Minecraft 1.8.1-pre2, Minecraft 1.8.1-pre3, Minecraft 1.8.8, Minecraft 15w32c, Minecraft 15w34a, Minecraft 15w34b, Minecraft 15w34c, Minecraft 15w34d
Fix Version/s: Minecraft 15w44b

Type: Bug
Reporter: Qi-rui Chen Assignee: Unassigned
Resolution: Fixed Votes: 13
Labels: directional, piston
Environment:

Java 7
Windows 7


Attachments: PNG File 2012-11-14_20.07.25.png     PNG File 2012-11-14_20.07.37.png     PNG File 2012-11-14_20.07.39.png     PNG File 2012-11-14_20.07.47.png     PNG File 2012-11-14_20.08.00.png     PNG File 2012-11-14_20.08.04.png     PNG File 2012-11-14_20.08.09.png     PNG File 2012-11-14_20.08.11.png     PNG File 2012-11-14_20.08.20.png     PNG File 2014-10-16_23.11.46.png     PNG File collision box visualisation.png    
Issue Links:
Duplicate
is duplicated by MC-5386 Piston Arm Collision Clipping Bug Resolved
is duplicated by MC-5967 Walk through extended piston arms, st... Resolved
is duplicated by MC-6360 In Piston Resolved
is duplicated by MC-7975 Walking through open piston and incor... Resolved
is duplicated by MC-8622 Piston Extended Arm Glitch Resolved
is duplicated by MC-10056 bad piston head hitbox Resolved
is duplicated by MC-11641 Collision bug with extended pistons Resolved
is duplicated by MC-12060 Piston's Hitbox Resolved
is duplicated by MC-17550 Pistons Resolved
is duplicated by MC-32378 Piston Noclip Resolved
is duplicated by MC-47862 Player able to pass through the arms ... Resolved
is duplicated by MC-52488 Walking through a piston Resolved
is duplicated by MC-53498 Walk through pistons Resolved
is duplicated by MC-54051 You can walk through an extended pist... Resolved
is duplicated by MC-54589 being able to walk through piston ext... Resolved
is duplicated by MC-56320 you can fall through extend piston if... Resolved
is duplicated by MC-61410 Ability to Walk Through Pistons Resolved
is duplicated by MC-61420 When you are very close to a piston, ... Resolved
is duplicated by MC-64115 Pistonhead no-clip Bug Resolved
is duplicated by MC-64244 Clipping errors Resolved
is duplicated by MC-69092 Extended Piston Hitbox Bug Resolved
is duplicated by MC-77557 When there is an extended piston you ... Resolved
is duplicated by MC-81616 Player/s Glitching through piston heads Resolved
is duplicated by MC-85778 When sprinting over piston arms you c... Resolved
is duplicated by MC-87106 Walk Through Retracting Pistons Resolved
is duplicated by MC-3496 Piston hitbox Resolved
CHK:
Confirmation Status: Confirmed

 Description   

In both gamemodes, placing a piston while facing east then powering it will allow you to talk through the piston head.
Walking through these piston while facing north makes the heads act as if they are a full block, meaning you can't walk to the piston arm itself.

What I expected to happen was...:
What happens when the piston faces any other direction, you cannot walk through it.

What actually happened was...:
You could walk through it

Steps to Reproduce:
1. Face EAST
2. Place any kind of piston, one on top of each other
3. Power both pistons in any way
4. Face the arm from the south
5. Walk southwest so you are stuck between the arm and head of the piston
6. Walk southeast into the piston head



 Comments   
Comment by Magnavode [ 21/Jan/16 ]

I tested in 16w02a and the current 16w03a, both in all cardinal directions. I did not run into the bug.

Comment by [Mod] redstonehelper [ 19/Jan/16 ]

So this is still happening in 16w02a?

Comment by Ashley5478 [ 19/Jan/16 ]

Incorrect, Piston arms don't let go pass through when facing directions with the exception of facing west. Which means only Facing West will let player go through.

Comment by [Mod] redstonehelper [ 05/Nov/15 ]

Fixed somewhere between 15w34d and 15w44b, probably with MC-1635.

Comment by George Gates [ 05/Nov/15 ]

Can't reproduce anymore in 15w45a, was probably fixed earlier.

Comment by Amr Satrio [ 22/Aug/15 ]

Confirmed in 15w34d.

Comment by Kumasasa [ 16/Oct/14 ]

Ok, got it.

Comment by Dlawso the Really Lucky Rabbit [ 16/Oct/14 ]

Can confirm fixed for pistons facing east, but it now occurs with a piston facing west.

Comment by Magnavode [ 16/Oct/14 ]

The piston in the image you just posted is facing east, however the faulty piston is facing west (it is placed while facing east).
I double checked using the sandstone textures, however I really tired right now, maybe I overlooked something or I'm missing the point of your picture.
Not that it really matters, it should be easy enough to find if you place 4 pistons around a redstone torch.

Comment by Kumasasa [ 16/Oct/14 ]

Derp. Meant 1.8.1-pre1, not 1.8-pre1.
But cannot confirm in 1.8.1-pre2, see screenshot

Comment by Magnavode [ 16/Oct/14 ]

Only 1.8.1-pre1 has the adjusted hitbox (not 1.8). 1.8.1-pre2 is back to the old malformed hitbox.

Edit: version fix 1.8-pre1 => 1.8.1-pre1

Comment by Kumasasa [ 16/Oct/14 ]

Was this fixed in 1.8 or 1.8-pre1 ?

Comment by Magnavode [ 15/Oct/14 ]

Can confirm what George Gates commented.

The piston arm's hitbox has been adjusted, but is still malformed.

Comment by George Gates [ 15/Oct/14 ]

Tested in 1.8.1-pre1, and I was not able to recreate it.

Piston arms facing west (according to the 1.8 debug menu's block info) have a differently-shaped hitbox than the other arms, but none of them can be walked through anymore from what I tried.

Comment by Itouch2 [ 29/Aug/14 ]

Confirmed for 1.8pre2.

Comment by Alcalini [ 26/Aug/14 ]

Confirmed for 1.8 prerelease 2

Please, fix it before release!!

Comment by Preben Gjelsvik [ 28/Jul/14 ]

Still in 14w30c (MC-64115)

Comment by Itouch2 [ 21/Jun/14 ]

Confirmed for 14w25b.

Comment by Itouch2 [ 26/May/14 ]

Confirmed for 14w21b.

Comment by Kevin Reid [ 26/Jan/14 ]

Confirmed in 14w04b: behavior appears to be identical to previous versions.

Comment by [Mod] Ezekiel (ezfe) [ 26/Jan/14 ]

Is this still a concern in the latest Minecraft version 14w04b? 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 BoxFigs [ 10/Jul/13 ]

Also in 1.6.2; I just tested it.

It's very easy to do if you walk north or south into the piston arm, then turn to face the piston box a bit (it never works when turning to face the arm).
Also, you're able to strafe back and forth through the arm when facing east or west if you're in the right position.

Comment by SuporeMaster [ 02/Jul/13 ]

Tested it in 1.6.1, still here.

Comment by Josh Jones [ 30/May/13 ]

confirmed in 13w21b. Walking south allows player (in any gamemode) and some mobs to pass through the "arm". Walking north will only allow player to pass through if they jump near the piston first.

Comment by Marios [ 01/Mar/13 ]

This bug breaks farms like the tripwire enderman farm because mobs get stuck inside the piston arm, so the pistons are constantly powered (because the mob steps on the pressure plate) and never retract. Voted.

Comment by George Gates [ 28/Feb/13 ]

Confirmed to still happen in 13w09b.

I first found out about it by falling through while walking on top. XD

EDIT: I meant b.

Comment by Tails [ 27/Jan/13 ]

Confirmed in 13w04a.

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