[MC-1127] Walking on blocks less than 1 block tall placed on ice, slime blocks or honey blocks acts like walking on ice, slime block or honey blocks directly Created: 29/Oct/12  Updated: 30/Aug/24  Resolved: 12/Feb/20

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Minecraft 1.4.2, Minecraft 1.4.5, Minecraft 1.4.7, Snapshot 13w06a, Snapshot 13w07a, Snapshot 13w09a, Snapshot 13w09b, Snapshot 13w09c, Snapshot 13w10a, Snapshot 13w10b, Minecraft 1.5, Snapshot 13w11a, Minecraft 1.5.1, Snapshot 13w16a, Snapshot 13w16b, Minecraft 1.5.2, Snapshot 13w17a, Snapshot 13w18a, Snapshot 13w18b, Snapshot 13w18c, Snapshot 13w19a, Snapshot 13w21a, Snapshot 13w21b, Snapshot 13w22a, Snapshot 13w23a, Snapshot 13w23b, Snapshot 13w24a, Snapshot 13w24b, Snapshot 13w25a, Snapshot 13w25b, Snapshot 13w25c, Snapshot 13w26a, Minecraft 1.6, Minecraft 1.6.1, Minecraft 1.6.2, Minecraft 1.6.3, Minecraft 1.6.4, Minecraft 13w36a, Minecraft 13w36b, Minecraft 13w37a, Minecraft 13w37b, Minecraft 13w38a, Minecraft 13w38b, Minecraft 13w38c, Minecraft 13w39a, Minecraft 13w39b, Minecraft 13w41a, Minecraft 13w41b, Minecraft 13w42a, Minecraft 13w42b, Minecraft 13w43a, Minecraft 1.7, Minecraft 1.7.1, Minecraft 1.7.2, Minecraft 13w47a, Minecraft 13w47b, Minecraft 13w47c, Minecraft 13w47d, Minecraft 13w47e, Minecraft 13w48a, Minecraft 13w48b, Minecraft 13w49a, Minecraft 1.7.3, Minecraft 1.7.4, Minecraft 14w02a, Minecraft 14w02b, Minecraft 14w02c, Minecraft 14w03b, Minecraft 14w04a, Minecraft 14w04b, Minecraft 14w05a, Minecraft 14w05b, Minecraft 14w06a, Minecraft 14w06b, Minecraft 14w07a, Minecraft 1.7.5, Minecraft 14w11b, Minecraft 1.7.9, Minecraft 14w17a, Minecraft 14w20b, Minecraft 14w21a, Minecraft 14w21b, Minecraft 14w27b, Minecraft 14w29b, Minecraft 14w30c, Minecraft 14w32a, Minecraft 1.8-pre1, Minecraft 1.8-pre2, Minecraft 1.8, Minecraft 1.8.1-pre3, Minecraft 1.8.1, Minecraft 1.8.8, Minecraft 15w31a, Minecraft 15w31b, Minecraft 15w38a, Minecraft 15w42a, Minecraft 15w43b, Minecraft 15w43c, Minecraft 15w44a, Minecraft 15w44b, Minecraft 15w45a, Minecraft 15w46a, Minecraft 15w47a, Minecraft 15w47c, Minecraft 15w49a, Minecraft 15w49b, Minecraft 1.8.9, Minecraft 15w50a, Minecraft 15w51a, Minecraft 15w51b, Minecraft 16w02a, Minecraft 16w03a, Minecraft 16w04a, Minecraft 16w05b, Minecraft 16w06a, Minecraft 16w07a, Minecraft 16w07b, Minecraft 1.9 Pre-Release 1, Minecraft 1.9 Pre-Release 3, Minecraft 1.9.1 Pre-Release 3, Minecraft 1.9.1, Minecraft 1.9.2, Minecraft 16w14a, Minecraft 1.9.3 Pre-Release 3, Minecraft 1.9.4, Minecraft 16w20a, Minecraft 16w21a, Minecraft 16w21b, Minecraft 1.10 Pre-Release 1, Minecraft 1.10 Pre-Release 2, Minecraft 1.10, Minecraft 1.10.1, Minecraft 1.10.2, Minecraft 16w32a, Minecraft 16w32b, Minecraft 16w33a, Minecraft 16w35a, Minecraft 16w38a, Minecraft 16w40a, Minecraft 16w41a, Minecraft 16w42a, Minecraft 16w43a, Minecraft 16w44a, Minecraft 1.11 Pre-Release 1, Minecraft 1.11, Minecraft 16w50a, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 17w17a, Minecraft 17w17b, Minecraft 1.12 Pre-Release 5, Minecraft 1.12 Pre-Release 6, Minecraft 1.12, Minecraft 1.12.1, Minecraft 1.12.2, Minecraft 17w50a, Minecraft 18w16a, Minecraft 1.13-pre3, Minecraft 1.13.1, Minecraft 1.13.2, Minecraft 18w46a, Minecraft 18w47a, Minecraft 18w47b, Minecraft 18w48a, Minecraft 18w48b, Minecraft 18w49a, Minecraft 18w50a, Minecraft 1.14.3, 1.14.4, 19w46b, 1.15 Pre-Release 2, 1.15 Pre-release 4, 1.15 Pre-release 5, 1.15 Pre-release 6, 1.15 Pre-release 7, 1.15, 1.15.1, 1.15.1 Pre-release 1, 1.15.2 Pre-release 2, 1.15.2, 20w06a
Fix Version/s: None

Type: Bug
Reporter: [Mod] Michael Wobst Assignee: Unassigned
Resolution: Works As Intended Votes: 47
Labels: ice, slime_block

Attachments: PNG File 2012-11-21_12.11.07.png    
Issue Links:
Duplicate
is duplicated by MC-6451 Soul sand and ice Resolved
is duplicated by MC-9578 you can slide on chests placed on ice Resolved
is duplicated by MC-12834 Block Slipperiness Detection Resolved
is duplicated by MC-28202 Ice Bug Resolved
is duplicated by MC-28269 Enchantment Tables and Ice Resolved
is duplicated by MC-28458 If u Place Half Slabs (Stone Brick Sl... Resolved
is duplicated by MC-32805 When a stone half slab is above ice, ... Resolved
is duplicated by MC-39255 When walking on a chest that is place... Resolved
is duplicated by MC-40923 Ice properties are given to a chest i... Resolved
is duplicated by MC-44454 Slime Blocks beneath Bed Resolved
is duplicated by MC-53970 Slipping bug Resolved
is duplicated by MC-73552 Packed Ice / Compressed Ice beneath C... Resolved
is duplicated by MC-105788 enchanting table is slippy when place... Resolved
is duplicated by MC-128984 if player coorid. is y<1 block above... Resolved
is duplicated by MC-137745 If a slab is on ice, you can slide on... Resolved
is duplicated by MC-154106 Ice and Chest Bug Resolved
is duplicated by MC-155371 When stone cutter is on ice, its phys... Resolved
is duplicated by MC-164731 Movement on bottom stone brick slabs ... Resolved
is duplicated by MC-165157 Player can get stuck in a Cauldron/Co... Resolved
is duplicated by MC-178439 Ice blocks slow you down while you ar... Resolved
is duplicated by MC-188715 Slime Block Fall damage and "Bouncyne... Resolved
is duplicated by MC-193417 Bounce on slime while standing in a c... Resolved
is duplicated by MC-195784 Honey blocks interaction with half slabs Resolved
is duplicated by MC-199749 Items stick to honey through non full... Resolved
is duplicated by MC-204439 you slide on candles when they are on... Resolved
is duplicated by MC-222253 Composters work strange. Resolved
is duplicated by MC-226947 Players and mobs slide on bottom slab... Resolved
is duplicated by MC-242095 Ice Slippery effect on slabs and stairs Resolved
is duplicated by MC-244154 sliding on slabs on ice Resolved
is duplicated by MC-251357 Jumping effect on honey still happens... Resolved
is duplicated by MC-262444 walking on bottom slabs on ice behave... Resolved
is duplicated by MC-264432 Honey / Slime block proprieties are s... Resolved
is duplicated by MC-268328 Slime blocks can bounce from any bloc... Resolved
is duplicated by MC-269410 Slabs, Cakes, Trapdoors, Mob heads an... Resolved
is duplicated by MC-274958 The bouncing effect of the bed still ... Resolved
is duplicated by MC-276176 Walking on bottom half slabs with sli... Resolved
is duplicated by MC-1213 Half Slabs On Top Of Ice Still Have I... Resolved
is duplicated by MC-1513 If you place a slab on top of an ice ... Resolved
is duplicated by MC-2411 Sliding stairs Resolved
is duplicated by MC-3135 Players and items on halfslabs placed... Resolved
Relates
relates to MC-248947 Pointed Dripstone still deals damage ... Resolved
relates to MC-263282 Magma blocks damage entities through ... Resolved
relates to MC-182442 Soul sand slowness applied when walki... Open
relates to MC-197072 Dirt path, farmland and mud on top of... Open
relates to MC-163952 Soul sand above ice, packed ice, or s... Resolved
relates to MC-271583 Soul speed no longer works through pa... Resolved
CHK:
Confirmation Status: Confirmed
Category:
Block states, Hitboxes, Player

 Description   

Place some slabs on an ice/slime block and walk on them. You will have a strange slippy/sticky walking behavior like you would be directly on the ice/slime block. Also works with End Portal Frames and other blocks not being as tall as a full block (Soul Sand, chests, stairs, ...).



 Comments   
Comment by Draco Silverwing [ 03/Jun/20 ]

I included the relevant code way back in 2013 (I have no reason to believe that it has substantially changed since). The code floors the player's position values to integers, then subtracts 1 from Y. This works fine if the player is standing anywhere within the XY bounds of the block, and directly on top of it, but as soon as the player is any amount above the block (including jumping and flying) the results change.

I at the time suggested subtracting 1/16th (instead of 1), then flooring, which will always result in the same block if the player is walking on top of a half slab or similar, and would also work for carpets (which are 1/16th thick). Using a smaller value (eg. epsilon) further minimizes the amount above the block could be and get the wrong block (although there are few blocks in Minecraft that do not have size deltas less than 1/16th, only a pressure plate (depressed) does, but it doesn't have collision).

Comment by Aaron Rhodes [ 03/Jun/20 ]

Considering you don't even have physical contact with those blocks yet their properties (which rely on physical contact) still apply, it's a no-brainer that it was a bug to begin with. The only reason I can see for this being intended is if the code is set to detect a player in the block space above those blocks, as opposed to being physically on top of the block itself. In that sense the code would be working exactly as it was designed to, despite it not being an intuitive or reasonable design.

Comment by Kroppeb [ 08/May/20 ]

According to MC-163952 this is no longer WAI but FIXED instead, at least for the case of soulsand and ice (MC-6451)

Comment by _zombiehunter [ 13/Feb/20 ]

Wow, took you guys a veeery loooong time to decide this is WAI. But still, good to know this is a feature now

Comment by Jeremy [ 09/Jan/20 ]

Should be 'won't fix' in my opinion. This bug allows greater player creativity since you can place slabs on ice rather than having ice itself aid in ice based speed tunnels. Doesn't allow for anything more, and is a quirk that adds to the possibilities in the game.

Comment by RedCMD [ 06/Jul/19 ]

related to MC-1133

Comment by Matt S [ 06/Jul/19 ]

Affects 1.14.3

Occurs on Farmland and Grass Path as well.

Comment by Henrik D. [ 17/May/19 ]

I think this bug is actually kind of a feature, because you can use it so widely e.g. for superspeed sprinting tunnels through the nether. It would be a shame if this gets fixed, even though it makes no sense that you could slip on half slabs if there is ice under them.

Comment by Connor Steppie [ 12/Dec/18 ]

Affects 18w50a

Comment by Connor Steppie [ 05/Dec/18 ]

Affects 18w49a

Comment by Connor Steppie [ 30/Nov/18 ]

Affects 18w48b, can I request ownership of the ticket?

Comment by Connor Steppie [ 29/Nov/18 ]

Affects 18w48a

Comment by Connor Steppie [ 25/Nov/18 ]

Affects 18w47a and 18w47b

Comment by Connor Steppie [ 18/Nov/18 ]

Affects 18w46a

Comment by Florian CUNY [ 24/Aug/18 ]

Affect 1.13.1

Comment by Matthew [ 23/Jun/18 ]

Can confirm in 1.13-pre3.

Comment by [Helper] Lord_Quadrato [ 25/Apr/18 ]

Affects 18w16a

Comment by [Mod] bemoty [ 09/Aug/17 ]

Can confirm for 1.12.1.

Comment by [Mod] Sonicwave [ 22/May/17 ]

Confirmed for 1.12-pre5.

Comment by user33 [ 28/Apr/17 ]

Confirmed for 17w17b

Comment by null (Inactive) [ 23/Jun/16 ]

Confirmed for 1.10.2.

Comment by null (Inactive) [ 22/Jun/16 ]

Confirmed for 1.10.1.

Comment by null (Inactive) [ 07/Jun/16 ]

Confirmed for 1.10-pre2.

Comment by null (Inactive) [ 03/Jun/16 ]

Confirmed for 1.10-pre1.

Comment by null (Inactive) [ 26/May/16 ]

Confirmed for 16w21b.

Comment by null (Inactive) [ 25/May/16 ]

Confirmed for 16w21a.

Comment by null (Inactive) [ 18/May/16 ]

Confirmed for 16w20a.

Comment by null (Inactive) [ 11/May/16 ]

Confirmed for 1.9.4.

Comment by null (Inactive) [ 05/May/16 ]

Confirmed for 1.9.3-pre3.

Comment by James (inactive) [ 15/Mar/16 ]

Confirmed for 1.9.1-pre3.

Comment by Erik [ 25/Feb/16 ]

Confirmed for 1.9-pre3

Comment by user-f2760 (Inactive) [ 12/Feb/16 ]

jerrykim306: The tracker wasn't available untill 1.4, older versions cannot be added as they don't exist on the tracker and onlycurrent versions can be selected
Also 1.0.0 is outdated

Comment by Ashley5478 [ 12/Feb/16 ]

This bug was affected minecraft version 1.0.0 or older.

Comment by Commander Sealand [ 02/Dec/15 ]

Confirmed for 15w49a

Comment by user-f2760 (Inactive) [ 25/Nov/15 ]

No, it's not, else this would've been resolved back during 1.4 development, give me 1 reason why this would bs intended

Comment by Anomonous Anomonous [ 25/Nov/15 ]

Probably Intended

Comment by [Mod] redstonehelper [ 22/Nov/15 ]

I guess there's multiple ways these problems can be looked at (and fixed). Reopening.

Comment by Draco Silverwing [ 22/Nov/15 ]

They are NOT caused by the same basic issue. This one is caused by the incorrect order of operations (floor, then -1, rather than -1, then ceil). That issue is caused by the use of a single point check rather than checking all four corners of the player's hitbox.

Comment by KingSupernova [ 22/Nov/15 ]

While there could be 2 different fixes, they are both caused by the same basic issue. It would probably make more sense to combine them, then if one is fixed without the other just reopen the one that wasn't fixed.

Comment by Anon Ymus [ 21/Nov/15 ]

I would argue that they are slightly different; MC-1133 is about x/z position while this ticket is about vertical position. The two don't always occur at the same time and I think it is conceivable that one could be fixed while the other stays the same.

Comment by [Mod] redstonehelper [ 21/Nov/15 ]

Resolved MC-1133 to this ticket.

Comment by KingSupernova [ 21/Nov/15 ]

Relates to MC-1133. In fact, they are basically the same bug. The game calculates effects based simply on the block below the player's center, not what they are actually standing on.

Comment by Commander Sealand [ 21/Nov/15 ]

Confirmed in 15w47c. In addition to ice & slimeblocks, packed ice will also cause strange behavior.

Comment by Swekob [ 25/Oct/15 ]

Confirmed for 15w43c.

Comment by [Mod] Michael Wobst [ 15/Oct/15 ]

Thanks. Will take care of this ticket.

Comment by [Mod] redstonehelper [ 15/Oct/15 ]

Original reporter is inactive, giving ticket to miwob.

Comment by [Mod] Michael Wobst [ 15/Oct/15 ]

Still in 15w42a and below

Comment by [Mod] Michael Wobst [ 16/Sep/15 ]

Still in 15w38a and below

Comment by [Mod] Michael Wobst [ 30/Jul/15 ]

Still an issue in 15w31a, 15w31b

Comment by [Mod] Michael Wobst [ 27/Nov/14 ]

Still an issue in Minecraft 1.8.1

Comment by [Mod] Michael Wobst [ 14/Oct/14 ]

Still an issue in Minecraft 1.8-pre3 and 1.8

Comment by [Mod] Michael Wobst [ 26/Aug/14 ]

Still an issue in 1.8-pre1 and 1.8-pre2

Comment by [Mod] Michael Wobst [ 06/Aug/14 ]

Still an issue in 14w32a

Comment by [Mod] Ezekiel (ezfe) [ 02/Aug/14 ]

Please do not mark unreleased versions as affected. You do not have access to this yet.

Comment by [Mod] Michael Wobst [ 29/Jul/14 ]

Confirmed for 14w30a, 14w30b, 14w30c

Comment by [Mod] Michael Wobst [ 20/Jul/14 ]

Confirmed for 14w29b

Comment by [Mod] Michael Wobst [ 09/Jul/14 ]

Confirmed for 14w27b

Comment by Draco Silverwing [ 23/May/14 ]

"Open" and "Closed: Won't Fix" aren't the same thing.

Comment by kasamikona [ 23/May/14 ]

guys give up already... this has been in the game since 1.4.2 and it's nearly 1.8 already. i think mojang have unofficially decided to keep this in. perhaps we will see confirmation some time soon.

Comment by Marcono1234 [ 23/May/14 ]

Confirmed for 14w21b

Comment by Draco Silverwing [ 24/May/13 ]

Louis: that rapid jumping behavior with trapdoors was fixed around 1.4 I think. I had a parkour type map that used it and had to update it to remove that particular jump.

Comment by MegaScience [ 24/May/13 ]

Actually, while I agree this probably shouldn't be possible, it does make a difference to put something above it. I've seen people put trap doors above ice to create smaller space. When jumping rapidly while sprinting through it, you go even faster than just having ice. Just pointing that out.

Comment by Draco Silverwing [ 25/Mar/13 ]

See MC-12834 for the code that causes this to happen and a fix.

Comment by _zombiehunter [ 08/Mar/13 ]

I reported it because it's a bug. It's entirely up to Mojang if they fix this bug or turn it into a feature.
To make ice runs, you can just use ice blocks without slabs too, it makes no difference.

Comment by Corgano Wade [ 07/Mar/13 ]

Why did you have to post this? It is awesome for making ice runs

Comment by _zombiehunter [ 21/Nov/12 ]

@Anon Ymus:
Can confirm this for Minecraft 1.4.5 when sneaking on slabs next to ice blocks.

Comment by Anon Ymus [ 21/Nov/12 ]

Also, it is possible to slide as if you were on ice when standing on the edge of a half-slab next to ice. (see screenshot)

Comment by Rolf Campbell [ 19/Nov/12 ]

This was a single-player game.
Logging out/back in did not help.
Closing the program and restarting it did not help.
I have been able to reproduce this in 1.4.4. I have not tried it in the 1.4.5 pre-release.

Comment by sciguyryan [ 19/Nov/12 ]

Ice speedways. Plain and simple. They are a good feature.

Comment by Matt Sowden (resba) [ 19/Nov/12 ]

Hello! Please provide additional information, so we can better help with your problem:

  • Was this a single player or multi-player/lan game?
  • Was the issue corrected after logging out and back in?
  • Was the issue corrected after closing the program and restarting?
  • Have you been able to reproduce this?
    You may also want to review the guidelines for writing helpful bug reports.
Comment by Rolf Campbell [ 19/Nov/12 ]

I don't know what uses sciguyryan is talking about. All I know is that when I built a slab-road across an icy lake, I slip around on the slabs. I think this should be fixed.

Comment by sciguyryan [ 31/Oct/12 ]

This may or may not be a bug and either way it probably shouldn't be fixed given the number of uses that have come up for this feature since the reintroduction of silk touch on ice. Just like BUD switches it would be rather unfortunate to have this removed.

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