FFlagPremultiplyViewportframeBackgroundColor causes viewport background color to render incorrectly

[Star_Mades (Star_Made)]

After the PremultiplyViewportframeBackgroundColor FFlag was pushed in 0.691.0.6910866 it seemingly broke the way that the BackgroundColor3 property was being rendered. It now no longer renders ontop of the objects under the viewport. I have attached a simple repro place and some visual examples of the issue.

To repro simply disable the flag and press play on the attached repro file, and then enable the flag and test again. There should be a clear visual difference between the two.

This is when it was working prior to the flag being enabled

This is after the flag was enabled

Attached below is a simple repro place file.
ViewportBugRepro.rbxl (67.9 KB)

Expected behavior

I expect the BackgroundColor3 render behavior on the ViewportFrame to be 1:1 with how it was prior to the flag being enabled.

[Pandas_AreSoCuteYes]

Can also reproduce this issue can this be fixed?

Seems like I’m not the only one with the issue:

Viewportframe black outline

Recently, a black outline started appearing on my viewportframes when this previously wasn’t the case I have an updated & an old version of studio running at the same time (Haven’t restarted the older version yet) so here is an image of the before & the after: Before: [image] After: [image] Expected behavior I’m assuming something got updated and that this is an unintended side-effect, I don’t expect there to be a black outline showing up The RBXM file is posted below, I used the same …

Image in ViewportFrame looks different

As of a few hours ago, while working a game, I noticed the mini-map’s appearance has changed. It is now darker, looks quite different from the original image. The mini-map is implemented as a Decal inside a ViewportFrame facing the camera. This issue affects both Roblox Studio and the live game client. I checked the published version, that wasn’t updated for a few days, and the texture appears darker there as well This is how the image always looked: [image] This is how it is looking now: […

I can also confirm that disabling PremultiplyViewportframeBackgroundColor fixes the issue.

[jaydubs808]

We’ve rolled back the flag change that caused this bug and it should not be occurring anymore. Can you confirm if this is the case for you?

[Pandas_AreSoCuteYes]

I can confirm the issue is now fixed! Thank you!

[Star_Mades (Star_Made)]

I can confirm that the issue is now completely resolved, thank you very much.

[jaydubs808]

Sorry for the trouble with this. Closing!