[MC-1635] Hitboxes for some blocks are broken

The hitbox of some blocks (chests, anvils) are not correctly registered and you can get stuck, or at least trigger a client/server desync while walking/jumping into sides of those blocks.

Steps to reproduce changed with the updates, but the glitch still exists. Here is a detailed explanation :

http://www.youtube.com/watch?v=y1kon5Wax8I

Steps to reproduce :

Place 2 double chests
Walk in the corner and slowly look at the other chest while walking
https://www.youtube.com/watch?v=p-8G_R8tLr4

Linked issues

is duplicated by 35

MC-1669 Possible to walk through two perpendicular anvils at the corner where they meet. Resolved

MC-3037 When standing, walking, or running on chest you uncontrollaby bob up and down. Resolved

MC-3793 Glitch through chests. Resolved

MC-5300 It is possible to go inside chests Resolved

MC-5563 I was playing on a server and I jumped on a chest with another chest one block above, and I glitches into the chest, and then it teleported me out. Resolved

30 more links

relates to 5

MC-73302 Block collision box issues (mobs glitch through blocks and more) Resolved

MC-9861 Stuck in pistons depending on camera angle Resolved

MC-88847 Upside-down Stairs are messed up. Resolved

MC-88863 Cobblestone Walls collision box messed up Resolved

MC-88870 Flowers hitboxes are too big Resolved

Attachments

Comments 41

Tavis 2012-11-16T20:36:15Z

You can reproduce the problem by looking at the near side of the chest, walking forward until you're touching it, then looking at the far side of the chest and moving forward. If you look at the far side while you are first walking forward, you'll notice that when you look at the near side you can actually walk forward a bit more.

You can also walk through them by arranging them like

##
#O

where # is a chest and O is you, walking into the corner, and looking back and forth between the chests in the corner. It's easier if the chests are eye level, and just as possible with them stacked two high.

This also works in survival, and can be used to reproduce MC-1749.

ElConquistador 2013-01-21T15:23:35Z

The Minecraft Team could fix this real easy. Instead of render update --> set global block bounds, get collision box --> return global block bounds change it to get collision box --> return changed block bounds.

Just change the global block bounds to a block bounds for each bock.

Jon Trollsten 2013-01-25T14:01:22Z

Happens to me but i dont mind

Marios 2013-02-11T16:17:38Z

MC-3804 and MC-1669 are the same reports like this one. There should be only one report open. Total votes for this bug: 47 Currently they are scattered in 3 open reports.

kumasasa 2013-02-11T16:23:42Z

Those issues are not necessarily the same:
MC-3804 : He writes of getting stuck in stairs
MC-1669 : Being pushed back by an anvil, but not stucking inside the anvil.

The three tickets are linked as "related to" to ensure when one will be fixed that the devs will look at the other tickets too.

31 more comments

Marios 2013-02-11T16:35:54Z

It's because both things happen The first reporter reported both the "stuck" part and the jerky movement part while the second one only reported the "stuttering" movement which happens when pressing movement keys. When this happens you are actually stuck because normally when pressing a movement key you should be able to move.

Gregory Brown 2013-03-09T03:22:45Z

A different but similar issue is happening in the 1.5 pre where I can just walk into the chest I'm going to post a scene shot of me doing this. The method I took to achieve this is as follows

Place two double chests on top of one another.
Place a sign one the front of the two chests.

Place a dog at a angle

walk into sign side keeping crossbar on the dog

Result is shown by screenshot

Gregory Brown 2013-03-09T03:23:34Z

My screenshots

Dranitsin Roman 2013-03-15T09:40:25Z

Can confirm in 13w11a, not personnaly happened with me, but with my dogs... Added two screenshots with my dogs stuck... They're stuck in chests when sitting, when standing they can walk out of them. Anvil in my toolbar was between chests, maybe it happened because anvil was there. idk. =D

Eleuin Development 2013-04-08T11:58:10Z

i have even seen mobs getting stuck in chests. even on youtube, i found a cat getting stuck inside a chest

Tyron 2013-05-20T07:42:44Z

Very annoying bug indeed 😞
Please fix it Mojang.

CubeTheThird 2013-09-26T02:33:28Z

Is this still a concern in the current Minecraft version 1.6.4 / Launcher version 1.2.5 ? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Jeuv 2013-10-25T21:25:48Z

Still in 1.7.2

fienxjox 2013-12-22T05:53:31Z

Still in 1.7.4

fienxjox 2014-01-16T18:49:48Z

Seems much reduced in 14w02c but still partially reproducible with anvils.

Gustavo Smith Buschle 2014-02-01T08:31:00Z

http://www.youtube.com/watch?v=p-8G_R8tLr4
I have made a video showin how to consistently recreate this issue.
First you start walking against the chest,
then you look at any chest, you should start jittering,
then look away from the chest, you should have gone through
Tested in 14w04b

Carl Fürstenberg 2014-05-08T20:13:42Z

Still confirmed for 14w19a

Wolf Clément 2014-07-01T12:30:55Z

Still affects 1.7.10 & 14w26c, but the glitch is now rarely triggered by the player. Updated steps to reproduce.

Wulfdao 2014-07-02T21:50:46Z

Still exists in 14w27b.

Wulfdao 2014-07-11T18:11:32Z

Still exists in 14w28b.

Wulfdao 2014-07-19T01:19:19Z

Still exists in 14w29b.

Wulfdao 2014-07-30T21:15:43Z

Still exists in 14w31a.

Wulfdao 2014-08-07T04:18:28Z

Still exists in 14w32a.

Wulfdao 2014-08-18T23:34:15Z

Still exists in 14w34b.

Wulfdao 2014-08-21T19:46:19Z

Still exists in 14w34d.

shawn greer 2014-09-05T17:28:29Z

still exists in 1.8

Wulfdao 2014-12-03T02:10:36Z

Still exists in 1.8.1.

Fenhl (Max Dominik Weber) 2014-12-09T07:40:39Z

Why is this only marked as “relates to MC-73302”? It should be closed as duplicate.

Dlawso the Really Lucky Rabbit 2014-12-09T10:19:33Z

Fenhl, this one talks about broken hitboxes. That one talks about mobs glitching through blocks.

branza 2014-12-09T15:37:16Z

No, Fenhl is right. MC-73302 is about a bad piece of code which causes this and a lot of other bugs.

yut951121 2014-12-10T02:15:27Z

@Sonic The 'broken hitbox' this ticket is stating is basically same thing as MC-73302

Sonicwave 2014-12-10T06:01:45Z

This one has more votes though and is 2 years older (making it easier/more "importance" for Mojang to see). Perhaps copy parts of that description to this one? (since that one is rather long)

Wulfdao 2015-01-04T22:34:20Z

Still exists in 1.8.2 pre1.

Wulfdao 2015-02-23T22:05:26Z

Still exists in 1.8.3.

Wulfdao 2015-04-18T04:14:59Z

Still exists in 1.8.4.

Mark Jeronimus 2015-05-17T12:56:35Z

I found a solid way to reproduce this and at least a starting point to look for the bug(s).

Walk up to a side of a double chest. Carefully tune your up/down viewing angle.

When angle is between 90 and 31.1, the hitbox starts at X.238 (≈3.8/16)
When angle is between -90 and 29.9, the hitbox starts at X.300 (=4.8/16)
When angle is between 29.9 and 31.1, you get stuck as the client and server disagree
Of course, when already at X.238, looking in any angle above 31.1 gets you stuck.

Sometimes, when the angle is between -90 and 27.1, the hitbox starts at X.238. I don't know what causes this. As soon as you get stuck, the hitbox resets to 0.300 for those angles.

With this, I suspect there are at least thrree bugs contributing to this:

Hitbox size typo in one of the two places where it's defined,
Angle-dependency that shouldn't exist,
The client/server disagreement.

I suggest not immediate fixing the first bug (if is's correct), because that would mask the other bugs.

branza 2015-05-17T13:07:41Z

@@unknown Try not to edit comments that much, it sends an email to everyone who's following this issue.

Wulfdao 2015-05-23T21:18:29Z

Still exists in 1.8.5.

Fenhl (Max Dominik Weber) 2015-08-10T22:19:08Z

Affects 1.8.8.

Wulfdao 2015-09-03T05:07:38Z

Still exists in 15w36c.

Wulfdao 2015-09-11T23:06:44Z

Still exists on 15w37a.