MC-249344Fluids do not snap to blocks above them in certain cases, causing undesirable gaps
The bug
When a fluid source is surrounded on all four sides and from above by either full solid blocks or other fluid sources, it does not appear as a full cube. This is an issue for several reasons:
- This constitutes a parity issue, as this behaviour is present in Bedrock Edition, and is valid due to 1.18.2's changes made to fluid rendering.
- In certain cases such as ice above water, that water does not snap upwards to the ice, which causes weird-looking inclines at block edges.
- In Spectator mode, the tops of underground fluid bodies are always visible, even though the other five sides never are, which makes visibility needlessly difficult.
How to reproduce
- Create a 3x3x3 hollow cube of glass (optionally have one side be a separate block that allows pixels to be counted)
- Place water or lava in the center of the cube, and then close it in the cube
Expected results
The fluid inside the cube would appear as a full, 16x16x16-pixel cube.
Actual results
The fluid inside instead appears to be a roughly 16x14x16 cuboid.
Linked Issues
Attachments17
Created Issue:
Fluids do not snap to blocks above them in certain cases, causing undesirable gaps
The bug
When a fluid source is surrounded on all four sides and from above by either full solid blocks or other fluid sources, it does not appear as a full cube. This is an issue for several reasons:
- This constitutes a parity issue, as this behaviour is present in Bedrock Edition, and is valid due to 1.18.2's changes made to fluid rendering.
- In certain cases such as ice above water, that water does not snap upwards to the ice, which causes weird-looking inclines at block edges.
- In Spectator mode, the tops of underground fluid bodies are always visible, even though the other five sides never are, which makes visibility needlessly difficult.
How to reproduce
- Create a 3x3x3 hollow cube of glass (optionally have one side be a separate block that allows pixels to be counted)
- Place water or lava in the center of the cube, and then close it in the cube
Expected results
The fluid inside the cube would appear as a full, 16x16x16-pixel cube.
Actual results
The fluid inside instead appears to be a roughly 16x14x16 cuboid.
Attachments8
Added Labels: fluid-geometry vanilla-parity
Added Attachments:
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
![[Mojang] MimmiB](../../../data/avatars/users/18949.svg){kind=small}
Added Affects Versions: 1.18.2
Deleted Comment:
A
Added Affects Versions: 22w18a
Added Attachments:
![[Mod] markderickson](../../../data/avatars/users/18946.svg){kind=small}
Removed Category: (Unassigned)
Added Affects Versions: 1.19
Added Affects Versions: 1.19.2
Added Attachments:
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Added Linked Issues:
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![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
Added Linked Issues:
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Removed Linked Issues:
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![[Helper] clam lol](../../../data/avatars/users/92852.png){kind=small}
Added Affects Versions: 25w03a
![[Mod] Jiingy](../../../data/avatars/users/91802.png){kind=small}
Water renders correctly if the block above happens to be waterlogged:
I would further add that the fluid should snap if the block above has a full bottom face, regardless of whether or not it's a full block.