Volumetric Fog stops working when enabling shadows for omnilight or spotlight

[jcostello]

Godot version

v4.0.dev.calinou [5db1f8b]

System information

Mx Linux (Debian Based)

Issue description

When enabling shadows for an omnilight or spotlight, volumetric fog stops working.

Steps to reproduce

Add environment
Enable Volumetric Fog
Add Omni Light (Make sure that its contributes to the Volumetric Fog)
Enable Omni Light Shadow
Fog stops working (or at least the light stops contributing)

fog.mp4

Minimal reproduction project

There is no reason to add minimal project since once the light's shadow is enabled it never contributes to the fog again even if the shadow is disabled. So all steps must be done to reproduce the issue.

[Calinou]

I couldn't reproduce this with OmniLights yesterday, but I couldn't get SpotLights to display in volumetric fog (even though there were no error messages).

[mrjustaguy]

I can confirm the issue on both OmniLights and SpotLights on v4.0.dev.custom_build [e3744d2fe]
Note - SpotLights are much more difficult to see the effect of Volumetric Fog, try to view them with black sky (custom color) that might help, unless it's a bug.

Also Shadows cannot be turned off for both of those, not sure for directional, I'm not sure if this is a Known issue atm.

[Calinou]

Also Shadows cannot be turned off for both of those, not sure for directional, I'm not sure if this is a Known issue atm.

Disabling shadows for point lights will only apply once you reload the scene. I reported it here: #50343

[jcostello]

@Calinou I can confirm this for Point Lights but not for Spot Lights. For some reason the fog still broken even if I reload the scene

[clayjohn]

This may have been fixed by #53353

[Calinou]

I can't reproduce this on commit 9d1626b. However, I can reproduce a similar issue but only for SpotLight3D (and not OmniLight3D): #57722

[Jamsers]

You won't believe this but somehow #50330 returned 😕

Changing the "quality scaling" to high enables shadows for the lamppost omnilights, this happens:

Huh.mp4

But if you change render scaling in-game, the issue fixes itself? 🤔

I've detailed reproduction steps at Bistro-Demo-Tweaked's #16.

[AThousandShips]

Please open a new bug report as this is a separate issue, it causing the same problem means it's a new issue having the same effect

[Calinou]

Issue opened: #83685