Java Edition:Half Door (Block)
Doors are made of an upper and lower half that are intended to always be connected. There have been and still exist methods that allow for the top or bottom half to be separated. Since this feature is still obtainable, it is a potential discontinued feature. All variants of doors can be split into a half door.
Half doors have changed appearance throughout the versions, sometimes not rendering or rendering in the incorrect location. Half door will break if they receive a block update. Which actions qualify as a block update has changed throughout the versions. Only the bottom half door will drop a door item when destroyed. Half doors were also required for door block transmutation.
Obtaining
Placement at Build Limit
From Infdev 20100607 (doors added) to Infdev 20100608, a door placed directly below the build limit will be cut off and leave only a bottom half door. This is the only method that can create a bottom half door at y=128 until the build limit was increased to 256 in 12w07a (1.2 snapshot).
Half door placed at the build limit in Infdev 20100608
Block Update
From Infdev 20100607 (doors added) to Beta 1.5_01, if a door causes an update when placed that changes the state or position of a neighboring block, and this update touches the bottom of the door, a top half door would be created. This method only allows you to obtain the top half of the doors. There are several simple method to get the door to create an update, listed below.
Farmland
A door placed could be placed directly on farmland in Infdev 20100607, the same version that added wooden doors. This updates the farmland into dirt and leaves only a top half door. From Infdev 20100607 to Beta 1.5_01, doors could be placed next to farmland underneath a block which updates the farmland into dirt. However, the block that was above the farmland cannot be removed without updating the half door.
Farmland before placement in Infdev 20100607
Half door after placement in Infdev 2010607
Sign
From Infdev 20100607 (doors added) to Infdev 20100630-1835 (retroactively renamed Alpha v1.0.0), a door placed next to a sign that is on a non-solid block, such as glass or a slab, will leave a top half door. After placing the door, the sign will update and break and the bottom half of the door will break and drop the door item.
Sign on glass before placement
Half door after placement
Cactus
From Alpha v1.0.11 to Beta 1.5_01, the top half door could be obtained by placing a door next to a cactus. This placement updates and breaks the cactus since a block is beside it and so it breaks the bottom half of the door and leaves just the top half.
The cactus before placement of the door.
The remaining half door after placement.
Half Door Relocation
From Infdev 20100607 to Beta 1.5_01, placing a door next to an existing half door will cause an update that breaks the existing half door and creates a new half door. This allows half doors to be "moved" upwards along a staircase.
Tree Replacement
A sapling that is grown into a tree could replace a door from Infdev 20100607 (wooden door added) to Beta 1.9 Prerelease 5. This first works on iron doors when they were added in Alpha v1.0.1. When the tree replaced only one half, the other half didn't update to break during this version range. This can be used to get both a top or bottom half door.
A sapling grown with bonemeal replacing the top half of a door and leaving only the bottom half.
Door Block Item
The wooden door block item and iron door block item can be obtained in Beta 1.6 Test Build 3. When placed these create the bottom halves of iron and oak wooden doors. The items are removed in 13w37a (1.7 snapshot).
Update Suppression
Update suppression can be used from Beta 1.6 Test Build 3 to 1.21.7 (present) to cause any door to be an upper or lower half door.
Pre-1.2 Door Corruption
To do: Implement exact DV spreadsheet
Certain doors placed in any version 12w05b (1.2 snapshot) or earlier will become a half door when updated to 14w26a (1.8 snapshot) to 1.13[test].[1] This applies to doors that have their hinge flipped from either double doors or placed next to a block. The doors can be loaded between 12w05b and 14w26a and they will still become half doors.
| Door Data Values in 12w05b and earlier | ||||||
|---|---|---|---|---|---|---|
| Data Value | half | hinge | facing/towards | open | powered | |
| 0 | lower | left | east | positive X | - | - |
| 1 | lower | left | south | positive Z | - | - |
| 2 | lower | left | west | negative X | - | - |
| 3 | lower | left | north | negative Z | - | - |
| 4 | lower | right | south | positive Z | - | - |
| 5 | lower | right | west | negative X | - | - |
| 6 | lower | right | north | negative Z | - | - |
| 7 | lower | right | east | positive X | - | - |
| 8 | upper | left | east | positive X | - | - |
| 9 | upper | left | south | positive Z | - | - |
| 10 | upper | left | west | negative X | - | - |
| 11 | upper | left | north | negative Z | - | - |
| 12 | upper | right | south | positive Z | - | - |
| 13 | upper | right | west | negative X | - | - |
| 14 | upper | right | north | negative Z | - | - |
| 15 | upper | right | east | positive X | - | - |
| Door Data Values in 12w06a and later | ||||||
|---|---|---|---|---|---|---|
| Data Value | half | hinge | facing/towards | open | powered | |
| 0 | lower | - | east | positive X | FALSE | - |
| 1 | lower | - | south | positive Z | FALSE | - |
| 2 | lower | - | west | negative X | FALSE | - |
| 3 | lower | - | north | negative Z | FALSE | - |
| 4 | lower | - | east | positive X | TRUE | - |
| 5 | lower | - | south | positive Z | TRUE | - |
| 6 | lower | - | west | negative X | TRUE | - |
| 7 | lower | - | north | negative Z | TRUE | - |
| 8 | upper | left | - | - | - | FALSE |
| 9 | upper | right | - | - | - | FALSE |
| 10 | upper | left | - | - | - | TRUE |
| 11 | upper | right | - | - | - | TRUE |
| 12 | ||||||
| 13 | ||||||
| 14 | ||||||
| 15 | ||||||
Skull Replacement
From 1.7.6-pre2 to 1.7.10, skull replacement could be used to create half doors. Skull replacement allows a skull to replace any block when placed on an incomplete block (such as stairs or a trapdoor) next to it. The replaced skull does not cause an update so it can replace either half of a door with any skull block.
Disappearing Doors on Chunk Load
In 15w35a and 15w35b (1.9 snapshots), certain oak and iron door halves disappear upon loading a chunk.[2] This bug does not happen to spruce, birch, jungle, acacia, and dark oak doors. The effect on the door depends on the block states of the door. The full list of effects is represented in the table below. See the table in spreadsheet form on the Google Sheets created by Porktuga.
The cases where the upper or lower half of a door vanishes but the other half does not vanish allow for half doors to be created. Note: iron doors always have their open and powered states equal.
| Legend | |
|---|---|
| X | This door half vanishes |
| ✓ | This door half remains the same |
| O | This door half remains but the open state is toggled |
| P | This door half remains but the powered state is toggled |
| Conversions | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| half | ||||||||||||||||
| lower | upper | lower | upper | lower | upper | lower | upper | lower | upper | lower | upper | lower | upper | lower | upper | |
| hinge | ||||||||||||||||
| left | right | left | right | left | right | left | right | |||||||||
| open | ||||||||||||||||
| FALSE | TRUE | FALSE | TRUE | |||||||||||||
| powered | ||||||||||||||||
| facing | FALSE | TRUE | ||||||||||||||
| east | X | ✓ | ✓ | ✓ | X | O | ✓ | ✓ | X | ✓ | ✓ | ✓ | X | O | ✓ | ✓ |
| north | X | X | ✓ | X | X | X | ✓ | X | X | X | P | X | X | X | P | X |
| south | X | X | ✓ | X | X | X | ✓ | X | X | X | P | X | X | X | P | X |
| west | X | X | ✓ | X | X | X | ✓ | X | X | X | P | X | X | X | P | X |
Block Palette Corruption
In 15w35d, block corruption in a chunk can result in a half door. Example: [1].
Double Half Door
A door consisting of two top half portions would generate in strongholds in 14w27b (1.8 snapshot).[3] This is only possible to encounter naturally if not all strongholds have been generated.
Update Skipping
Update skipping may be used to create top half doors. It cannot be used to create bottom half doors.
Intersecting Generation
Mineshaft & Stronghold
From Beta 1.8[test] to 1.16.5[test] mineshafts could intersect strongholds and cause half doors, both wooden and iron. This is only possible to encounter naturally if not all strongholds have yet been generated. An example of this with two half iron doors near each other is in seed -7632808837586881452 at approximately 607, 25, -842
The top half of a wooden door replaced by a fence.
Stronghold & Lake
From ≤14w11b (1.8 snapshot)[test] to ≥15w32b (1.9 snapshot)[test], lakes could cut into strongholds and leave only half of a door.[4] This is only possible to encounter naturally if not all strongholds have yet been generated.
An example of this occurring is seed 3268861822896236472 at x: 690, y: 14, z: 309.
The top half of an iron door generated in a stronghold with a water lake cutting into it.
Savannah Village Farm
From ≤1.14.1 Pre-Release 1[test] to 1.21.7 (present), farms in savannah villages can cut into houses and leave a top half acacia door.[5] The block underneath the top half acacia door is an ungrown wheat crop which means that the door will update and break whenever the crop grows if it receives a random tick. To preserve this half door, the player should not go near it after it has generated or else they risks the crop growing and the door breaking.
Examples of this occurring include:
- From 1.14.1 Pre-Release 1 to 20w19a (1.16 snapsot), seed -6167490019935187174 at coordinates 352 86 175.[6]
- From 1.16 Pre-release 6 to 21w05b (1.17 snapshot), seed 3479073257683704755 at coordinates -770 79 112.[7]
- From 21w43a (1.18 snapshot) to 22w13a (1.19 snapshot), seed 6093770552155741177 at coordinates -254 117 -286.[8]
- From 22w14a (1.19 snapshot) to the current version (last tested in 25w09b), seed 980200198861194 at coordinates -10 94 -137.[9]
A top half acacia door on top of crops, generated in a savanna village.
Taiga Village Trapdoor
From ≤1.14.1 Pre-Release 1[test] to 1.21.7 (present), trapdoors that generate in taiga villages can replace the bottom of a spruce door leaving only a top half spruce door.
Examples of this occuring include:
- From 1.14.1 Pre-Release 1 to 20w19a (1.16 snapshot), seed 735212979168233847 at coordinates -12 68 -8.[10]
- From 20w20a (1.16 snapshot) to 21w14a (1.17 snapshot), seed -617959978107921711 at coordinates 29 77 -233.[11]
- From 22w14a (1.19 snapshot) to the current version (last tested in 25w09b), seed -553412782305984154 at coordinates -297 71 2809.[12]
A top half spruce door on top of a spruce trapdoor, generated in a taiga village.
Village & Lava Lake
From ≤22w14a[test] to 24w18a (1.21 snapshot), it's possible for a lava lake to generate over a village house and place stone on half of a door. This generation bug was fixed in 24w19a. In 24w19a and later, the village will overwrite the lava lake instead of the lava lake overwriting the village.
The only known seed is seed 8955795698630575870 at coordinates -1291 111 -972 which works from 22w14a (1.19 snapshot) to 24w18a (1.21 snapshot).[13] The only known seed has an acacia door in a savanna village, this bug may be possible with an oak door or spruce door in other village types if more seeds are found.[test]
A bottom half acacia door below stone, generated in a savanna village.
Stronghold & Village
From ≤22w24a[test] to 1.21.7 (present), a very rare intersection that can lead to a half door is a village and a stronghold. The only known seed is -8657888806059704924 at coordinates 1649 -12 38 which works from 22w24a (1.19.3 snapshot) to 1.21.7 (present) (last tested in 1.21.5 Pre-release 2).[14] This seed generates a top half oak door with a path block underneath it. The village is able to generate at the same depth of the stronghold due to a giant cave that leaves the sky open
A top half oak door from a stronghold and village intersection.
Appearance
Besides the doors' texture changes (which can be found at the Minecraft Wiki), the half doors have changed the way they are rendered a few times.
Face Rendering
- Half doors are fully rendered from Infdev 20100607 to 13w09b (1.5 snapshot).
- Half doors are invisible from 13w09c (1.5 snapshot) to 14w08a (1.8 snapshot).
- Half doors are fully rendered from 14w10a to 14w32c (1.8 snapshots).
- Half doors omit the face corresponding to the middle of the door from 14w32d (1.8 snapshot) to 1.21.7 (present). This means lower doors have an unrendered top face while upper doors have an unrendered bottom face. This is due to the model file not defining this face as it wouldn't be visible anyway in normal gameplay.
Bottom half wooden door in 13w09b
Bottom half wooden door in 14w08a
Bottom half wooden door in 14w32c
Current appearance of bottom half oak door
Incorrect Rendering Location
Open half doors render at the incorrect location from 14w27a (1.8 snapshot) to 15w37a (1.9 snapshot). During this version range, the door renders on the opposite side of the block where the collision box is.
A half door rendered on the opposite side of the block in 15w37a
Behavior
Block Update Destruction
Half doors break when they receive a block update. A player right-clicking a wooden door will not break it. From Infdev 20100607 to 17w46a (1.13 snapshot), half doors would break when powered or unpowered. In versions 17w47a (1.13 snapshot) and later, they can be powered or unpowered without breaking. In 17w46a and earlier, the half door would get an update from any direction. In 17w47a and later, the half door only gets updated from above or below not the sides.
Item Drop
During the entire range from Infdev 20100607 to 1.21.7 (present), the lower half door drops a full door item if mined or destroyed from an update while the upper half door does not drop anything.
Uses
From 12w06a (1.2.1 snapshot) to 14w21b (1.8 snapshot), a top half wooden door could be used to do door block transmutation if on top of a desired block.
See also
References
- ↑ MC-134570. bugs.mojang.com.
- ↑ MC-87196. bugs.mojang.com.
- ↑ MC-60193. bugs.mojang.com.
- ↑ MC-72439. bugs.mojang.com.
- ↑ MC-149573. bugs.mojang.com.
- ↑ MC-153265. bugs.mojang.com.
- ↑ A naturally generated Half Door...? 3479073257683704755 - Reddit
- ↑ MC-242824. bugs.mojang.com.
- ↑ I guess half doors aren't actually that rare... - Reddit
- ↑ HalfDoor% SSG WR (4.733) - Youtube
- ↑ Reddit post discovering this seed
- ↑ OMG Guys I Found Half Of The Spurce Door - Reddit
- ↑ Natural half bed and half door - Reddit
- ↑ M33_Galaxy Discord Message in MC @ Home Discord