MC-175333Mysterious blinking pixels when in a dark area
Linked Issues
- Unresolved
![[Mod] Anthony Cicinelli](../../../data/avatars/users/10122.svg)
[Mod] Anthony Cicinelli- 22
- 8
- Confirmed
Low- Platform
- Rendering
- dark flying pixels
1.15.2 - 1.21
1.15.2 20w12a 20w13a 20w13b 20w14a 20w15a 20w16a 20w17a 20w18a 20w19a 20w20a 20w20b 20w21a 20w22a 1.16-pre1 1.16-pre2 1.16-pre3 1.16-pre4 1.16-pre5 1.16-pre6 1.16-pre7 1.16-pre8 1.16-rc1 1.16 1.16.1 20w27a 20w28a 20w29a 20w30a 1.16.2-pre1 1.16.2-pre2 1.16.2-pre3 1.16.2-rc1 1.16.2-rc2 1.16.2 1.16.3-rc1 1.16.3 1.16.4-pre1 1.16.4-pre2 1.16.4-rc1 1.16.4 20w45a 20w46a 20w48a 20w49a 20w51a 21w03a 1.16.5 21w05b 21w06a 21w07a 21w08b 21w10a 21w11a 21w13a 1.17 1.17.1-rc1 1.17.1 21w38a 1.18.1 1.18.2 1.19 1.19.2 1.19.4 1.20-rc1 1.20 1.20.3-rc1 1.21
Created Issue:
Mysterious blinking pixels when flying in a dark area
The Bug
When flying in a dark area multiple blinking pixels appearReplicate
- Find a dark area
- Fly around in the dark area
- Notice that multiple blinking pixels appear
Environment
Java Edition
Attachments1
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
Java Edition
relates to
![[Mojang] slicedlime](../../../data/assets/gravatar/slicedlime.jpeg){kind=small}
is duplicated by
is duplicated by
![[Mod] violine1101](../../../data/avatars/users/92858.png){kind=small}
The Bug
When flying in a dark area multiple blinking pixels appearReplicate
Find a dark area- F
ly around in thedark areaNotice that multiple blinking pixels appearThe Bug
When flying in a dark area multiple blinking pixels appearReplicate
- Make sure it is daytime
- Find a dark area
- Fly around in the dark area
- Notice that multiple blinking pixels appear
Mysterious blinking pixels whenflyingin a dark areaMysterious blinking pixels when in a dark areas
![[Mod] Chandler](../../../data/assets/gravatar/triwonder81.png){kind=small}
![[Mod] tryashtar](../../../data/avatars/users/41963.png){kind=small}
is duplicated by
![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
![[Mod] markderickson](../../../data/avatars/users/18946.svg){kind=small}
is duplicated by
MC-224740
Atachment 1.png
The Bug
When flying in a dark area multiple blinking pixels appearReplicate
- Make sure it is daytime
- Find a dark area
- Fly around in the dark area
- Notice that multiple blinking pixels appear
Code analysis by [Kroppeb] found in this comment
The Bug
When flying in a dark area multiple blinking pixels appearReplicate
- Make sure it is daytime
- Find a dark area
- Fly around in the dark area
- Notice that multiple blinking pixels appear
Code analysis by [Kroppeb] found in this comment
![[Helper] Johnibur](../../../data/avatars/users/28381.png){kind=small}
![[Mod] ampolive](../../../data/avatars/users/18949.svg){kind=small}
Mysterious blinking pixels when in a dark areas
![[Mod] Avoma](../../../data/avatars/users/86198.png){kind=small}
![[Mod] turbo](../../../data/avatars/users/92867.png){kind=small}
![[Mod] ManosSef](../../../data/avatars/users/61702.png){kind=small}
This is MC-175333
Thank you for your report!
However, this issue is a Duplicate of MC-175333.
Please use the search function in the future to prevent duplicate reports.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
Thank you for your report!
We're tracking this issue in MC-175333, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
– I am a bot. This action was performed automagically! Please report any issues in Discord or Reddit
Duplicate of MC-175333.
Can confirm. This first appeared in 1.15 (or some 1.15 snapshot). Apparently this somehow is caused by the rendering changes.
Could be related to/duplicate of MC-1794?
No its not a duplicate since these are pixels that randomly appear in situational areas like
MC-163789. I also wouldn't say its related.I don't know if I saw the same thing or not, but yeah, in a dark cave, bright pixels. Not blinking, per se, that is, if I stay still there is no change in the view, but if I move or turn, occasionally a pixel or two flashes. That phenomena can be exactly MC-1794 (or one of the myriad of technical reasons that make up the same/similar effect). (EDIT: after adding a little bit of light to see the blocks, the bright pixels are exactly at block edges, so yeah, what I see is definitely a case of MC-1794.)
If they blink while not moving (and not being moved by e.g. bobbing in fluids or falling/sinking etc.), and the target area has no moving blocks/entities, then it could be something else.
Since you wrote "when flying", MC-1794 would also show up as "blinking", so can not exclude that possibility with current info.
Found that this also affects 1.15.2
The pixels are cracks between 16x16x16 sections. The cracks can hardly be seen before but became much worse since 1.13.
It's noticeable that the flickering pixels aren't white. Their colors are probably the color of the sky.
Can confirm in 21w03a. I used the following command to reproduce this issue and this made it more noticeable.
Can confirm in 21w05b. Not sure about anyone else, but for myself, it can be seen a lot more often in this snapshot/version.
Can confirm in 21w07a.
Can confirm in 21w13a.
Even tho they're still exist in the newer snapshots, they're way less visible.
This is cause by precision issues in some of the floating point calculations. Or maybe better said: too much precision. If we have 2 chunks offset by the camera by 0.0000001f and 16.0000001f the second chunk offset get's rounded to 16.0f
which means if we now look at the vertices at the border with coordinate offsets 0 and -16 respectively, we get the coordinates 0.0000001f and 0.0f. As these are not the same coordinates, they will have slightly different edges which means these pixels can occur.
In my pr to Sodium to fixed this I round the camera part to 1/2^14, I think something similar could work here.
When pushing the ChunkOffset uniform
Note:
I haven't tested this, I have only tested some equivalent code in Sodium.
Can confirm in 1.18.1. To more easily reproduce this, you can run the following command and observe the issue occurring.
Can confirm in 1.18.2.
Can confirm in 1.19.
Can confirm in 1.19.2.
Can confirm. Happens on all 3 systems in my house including Steam deck. Multiple monitors, multiple devices. Although it seems severity varies per session and device.
Can confirm in 1.20.1
1.21 is also affected