Volumetric Fog stops working when enabling shadows for positional lights until 3D buffers are recreated

Jamsers commented 12 months ago

Godot version

v4.2.beta2.official [f8818f85e]

System information

Godot v4.2.beta2 - Windows 11 22H2 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 Laptop GPU (NVIDIA; 31.0.15.4584) - AMD Ryzen 5 5600H with Radeon Graphics (12 Threads)

Issue description

In Bistro-Demo-Tweaked/4.2-dev, changing the "Quality Scaling" to High enables shadows for the lamppost Omnilights.

This happens:

https://github.com/godotengine/godot/assets/39361911/13fab8d5-863e-4fdb-a38a-99d7fcef9f0a

But, as you can see, changing the render scaling in-game makes the issue go away?

Steps to reproduce

Reproduction steps as detailed at Bistro-Demo-Tweaked's #16:

Set the Density in the FogMaterial in the FogVolume to 0.2 (makes the issue much easier to see)
Run the demo
Set the Time Of Day to Night
Switch Quality Scaling between Normal and High

Changing Render Resolution in-game makes the issue go away.

Minimal reproduction project

I haven't been able to isolate a minimal reproduction project yet, I'll upload one as soon as I've found a root set of circumstances.

Issue can currently be reproduced at Bistro-Demo-Tweaked/4.2-dev.

atirut-w commented 11 months ago

I made a small MRP for easier testing: volumetric_shadows.zip

When shadow is enabled, only a very small area of volumetric fog is lit up. A huge concern is that this issue is also reproducible on v4.1.2.stable.official [399c9dc39] and that it also affect spot lights.

Jamsers commented 11 months ago

Oh nice, thank you! I actually tried creating an MRP but couldn't quite isolate the issue in a separate project. I'll check out your MRP instead. 👍

jss2a98aj commented 11 months ago

I have been encountering this as well in a large project, but was never able to reproduce it outside of it. Resizing the window should also fix the fog when this occurs.

godotengine / godot