How do I remove these lines in the sky?
These are artifacts in the picture. Due to limitations in the amount of colors a screen can display and compression artifacts those lines/blocky gradients appear.
Unfortunately there is not anything you can do about it as far as I know, however others may give some tips.
This looks like it could be due to the transformation tool leaving behind its grid. Have you tried restarting studio? If so it might just be a part with a texture in your workspace.
so it might just be a part with a texture in your workspace.
It did appear when I was deleting a texture?
Have you checked your workspace? Turned off plugins? Sounds a bit extreme but maybe try deleting everything in the workspace just to rule it out (you can always revert in version history if you published it before)
Also there is an old trick to make these gradients a lot smoother to the eye: adding noise (or dithering which is something else)
Here is the same image with a simple bit of random noise added
It is something in the workspace I just don’t know what.
This can be caused by skyboxes sometimes, check those.
If you go into your ribbon bar (top bar with all of your tools) you can click the grid off if it’s giving you mysterious issues.
As for the fragmenting, it could be a limiting factor of your graphics card or even your monitor.
I suggest you get a new one, or change Studio into something older like DirectX11 or try Vulkan (which is better than DX12, IF your card is new enough to support it) in your Preferences, under (I think) File. Do your research before selecting a different one though. But simply changing this might help get rid of those fragments; but that will only work if it’s a Roblox issue and not a issue with any other 3D graphics game.
FOUND THE PROBLEM!
A grid model was in camera!
Great job, see how small the issue can be but hard to find!