Skybox looks extremely degraded after changing the skybox textures a few times, affecting lighting

Bug Reports Engine Bugs
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#1

My experience Silly Simon Says is a minigame collection that all takes place within the same place instead of transporting players to another place for a different minigame like Epic minigames.
Going from minigame to minigame, I often have to change the skybox textures for the minigame.
i’ve noticed that after changing it a few times, the skybox has a high chance of becoming extremely degraded/pixelated.
This is how it should look:

LightingProblem2
LightingProblem21732×957 112 KB

When it becomes pixelated:

LightingProblem1
LightingProblem11707×1058 94.7 KB

You might also notice one other thing: the lighting is affected by the skybox being degraded, as you can see when the skybox is degraded, even when it is daytime in light blue sky, the client side environment diffuse scale essentially behave as it is set to 0, with all the parts looking very dark, making surfacegui unreadable.

Here is the place that you can replicate the bug in: SKYBOX and LIGHTING PROBLEM - Roblox

I have replicated this on both a PC as well as on my iphone 13.
PC: CPU

11th Gen Intel(R) Core(TM) i9-11900H @ 2.50GHz

Base speed:	2.50 GHz
Sockets:	1
Cores:	8
Logical processors:	16
Virtualisation:	Enabled
L1 cache:	640 KB
L2 cache:	10.0 MB
L3 cache:	24.0 MB

Utilisation	21%
Speed	3.91 GHz
Up time	1:22:33:24
Processes	339
Threads	6211
Handles	223278

Reproduction steps: launch the game, stay in the lobby and just wait as the minigames go on without you, currently it should happen around 2-3 minutes, but it may take longer.

Note: DOES NOT REPRODUCE in studio

Unfortunately, i have had no success replicating this bug in an empty baseplate yet. My suspicion is that it may require the game to have consumed a certain amount of client memory that cause it to degrade the skybox and thus affecting the lighting?

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Haze Atmosphere property appearing way darker on some clients
#2

as a workaround, I just modified my lighting to always have environment diffuse scale set to 0 so that even if the skybox degrades, it will not affect it. Cranked up ambient + outdoor ambient brightness to compensate.

but this still doesn’t address the extremely degraded skybox

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#3

Specifically, I think the client is running out of texture budget and is subsequently compressing the textures. Does this happen on mobile devices primarily?

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#4

I first noticed it on my pc starting a few months ago, and over the past week I started noticing it on my iphone 13 too.

On my pc, it happens fairly early on after spinning up a new server. memory log at developer console shows client memory at 1GB, client place memory at 330MB, client graphics texture memory at 80MB, doesn’t strike me as egregious?

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#5

Quick question, where are the other skyboxes being stored? Are they being stored on the client or server

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#6

the skybox textures are being changed on server side.

although when this happens, I would join the same server as a different user using a different device, and the skybox would look completely normal. So it does seem that whatever issue is happening it is happening on the client side.

#7

This is just an acknowledgment announcement!

We’ve filed a ticket into our internal database for this issue, and we will update you when we have further information!

Thanks for the report!

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#8

I’m taking a look and it seems that the place is privated. Could you send an rbxl file of the test place? Also is this issue still occuring?

#9

hi there, my bad as this report contains two issue:

  1. skybox become pixelated
  2. when the above happens, the client side environment diffuse scale behave as if it is set to 0

1 still happens quite rarely (observed once on the pc client about 2 weeks ago), but there is no set way to replicate it anymore.
As for 2, I had to find a workaround, so I adjusted my scene environment diffuse scale to permanently 0 and adjusted all other lighting settings to compensate for that, so while it may still happen, it is no longer an issue for me.

In my opinion, the skybox textures should never be a target of degradation in favor of performance, since the degradation of it has a huge impact. At the very least, it needs to be set to be one of the last targets only when everything else has failed.

#10

Ive seen reports regarding the second one but those seem to say that it isn’t happening anymore. I’m basing my opinion from interactions with Harsh Lighting in-game compared to Studio - #26 by LightSettingsGuy.

Ill figure out some about the sky degradation though. Ill try to get a repro.

#11

Would you be able to unprivate the place SKYBOX and LIGHTING PROBLEM and send or DM an rbxl file though to repro if possible?

#12

hi, I just dm-ed you the rbxl file.
Seeing that I’ve not touched the skybox logic since I posted the bug report, you might even have better luck reproducing it on a lower end pc on a public server of the live game (I reproduced it a few weeks ago):

The presence of other players might take up more memory and thus have a higher chance of forcing the skybox to degrade

#13

hey, just wanted to say that I’ve reencountered the issue:

image
image1919×981 254 KB

I see no errors or warnings, but the quality of Roblox’s UI is low resolution. As @misternicekai seems to note, this could be a low memory issue.

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