Flickering when changing scenes

[Morokiane]

Godot version

4.2 stable

System information

Windows 11 NVIDIA RTX 3060 Laptop GPU Vulkan / MacOS 14.1.1 M1, M2 Metal

Issue description

When changing scenes with a shader transition the game screen will flash white for a brief second when the new scene loads. This is happening on Windows and MacOS. This does not happen in 4.2 RC1 but became an issue in RC2 and is still present in stable. Does this on all modes, Forward+, Compatibility, Mobile

Steps to reproduce

Create a scene that has a shader transition that when the scene changes it does a "fade out" and "fade in"

Minimal reproduction project

Flicker.zip

[bitsawer]

Tested and I can confirm this. Reverting #85184 fixes this issue, but naturally restores the other regression bug that PR was fixing. There has been some adjustments to the scene change behavior, so I'll mark this as regression for now but it's possible some changes are intentional for example to avoid keeping both scenes in memory at the same time.

[Morokiane]

One way around this is changing the clear color in the Project Settings > Environment to the same color as the transition color, unfortunately this changes the workspace area to a color not always wanted.

Thanks to @bitbrain for finding this work around.

[InfinityDevTech]

Im pushing this again, especially since it is affecting me. Since I use a 2D tilemap with some transparent textures, I was using the scene background as my blue sky. This is really annoying that I have to do this manually, but its a small thing.

[nofacer]

same here when do transition with a black colorRect
v4.2.2 mac

[neepsnikeep]

Same with tweening. I set modulate to black, change scenes, and set it back to white. Both scenes have setting modulate to black in on_ready.

[phantomdesvin]

Can confirm this keeps happening on Godot 4.3 Stable. In my case I'm teening the modulate alpha of a Node2D that acts as a loading screen, having as childs a black ColorRect and a Label, then I load and instance a scene while the loading screen is still on the tree but the screen turns gray for an instant and then goes back to the loading screen. In my case it's a big single threaded load for the web so I have to use the label to inform the player it is loading something, so the black environment workarround can't be applied here.

[Billuc]

I had the same problem and worked around it. I am using a black ColorRect with an 0.5s animation on the modulate property from white to transparent to fade it out. The workaround is a second black ColorRect on top of the first one. This second ColorRect is animated in the same animation and only the visibility property is changed from true to false in the first millisecond. I don't have the knowlegde to explain why it works but I now have smooth scene transitions. Hope it helps !

I tried it on Fedora 40 and I will try it on Windows later in the day

[40-4]

This still is an issue; i have a transition shader which covers the screen, script adds the scene, and the transition shader shows the screen. The loaded screen is visible for a while when added to the tree

Edit: fixed it by adding await get_tree().process_frame before fading in.