Rendering fog in DReyeVR and using -vulkan about dreyevr HOT 24 CLOSED

(I'm not at my windows PC to test these things so I'm only going off memory)

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Yes! That fixes it! I can't thank you enough! It would have taken years to figure this out! Thank you!

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Yes, in order to build with Vulkan enabled, you'll need to edit this line (on Windows, Linux/MacOS have different lines according to their sections) and change the following:

from this:

[/Script/WindowsTargetPlatform.WindowsTargetSettings]
DefaultGraphicsRHI=DefaultGraphicsRHI_DX11

to this

[/Script/WindowsTargetPlatform.WindowsTargetSettings]
DefaultGraphicsRHI= DefaultGraphicsRHI_Vulkan

Then you'll need to rebuild.

However, I remember trying Vulkan on my local setup before and it demonstrated worse performance and other visual artifacts/glitches in VR so we stuck with DirectX 11 on Windows. Your mileage may vary here depending on GPU.

I think this can also be done by changing the default graphics settings in the editor: Project Settings -> Platforms -> Windows -> Target RHI -> Default RHI (set it to Vulkan)

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Making the necessary changes to the DReyeVR/Configs/DefaultEngine.ini file and rebuilding (make clean && make PythonAPI && make launch && make package) still throws the same error. Are there any steps I should have executed but missed?

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Have you tried both the file change and the UE4 UI change? (Project Settings -> Platforms -> Windows -> Target RHI -> Default RHI (set it to Vulkan))

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No, I have not tried the UE4 UI change. Let me try rebuilding now. Sorry!

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I tried the latter method, and the error is not resolved.
Instead of GlobalShaderCache-SF_VULKAN_SM5.bin, I have GlobalShaderCache-PCD3D_SM5.bin

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Are you still running with the -vulkan flag?

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With and without -vulkan gives the same error.
Note that in the unreal engine, I had the following options:

I only set Vulkan in the default RHI blank (as instructed). Did I also had to check Vulkan (SM5) and uncheck DirectX 11 & 12 (SM5)?

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Yeah try it

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Checking Vulkan (SM5) Worked. Thank you!

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I am trying to change the weather to foggy weather. However, it turns the sky dark

I know this thread was about being able to use the -Vulkan flag. However, the main concern was to correctly render the fog which according to previous discussions was only possible using Vulkan. Have you previously tried to render fog in the simulator? If yes, did you have any similar problems as I am having?
This is what after running python .\environment.py --fog 100 looks like for both -vulkan and -dx11:

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I am sorry for the bombardment of questions, but I really need your help 😥

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As a sanity check, does dynamic_weather.py render fog correctly? I remember using this script to play around with weather (including rain and fog) and it worked without issue.

If it doesn't then as a last resort I'll point you to the cpp where the weather data is held. You'll probably want to change the defaults of this struct so FogDensity is larger and the params get applied on BeginPlay similar to this (or you could just set it once in the constructor with hardcoded values, that'd be easier).

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No, using dynamic_weather.py renders the same dark sky.

I think I will try the latter implementation tomorrow. I need some sleep.

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Hmm yeah this is strange. it looks like the entire sky is not being rendered. Does it look this way in the editor as well? there are more fine-tuned skylight/environment parameters you can tune while in the editor

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Yes, if I press Play in UE4 and run python .\environment.py --fog 100, I still get a dark sky.

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Sure but what if you change the sky blueprint elements in the editor (no pythonAPI). You should be able to find the Skylight BP in the inspector tab on the right.

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Unfortunately, that also doesn't work. Just so that I am following you, this is what you are telling me to tweak, right?

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Yes, this looks like a problem with UE4 then, because that definitely should work.

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I also noticed you're on Windows 11, which is not something I've tested before or even knew DReyeVR/Carla worked on. That may be an/the issue but I'm not sure.

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Are you still rendering in Vulkan mode or DirectX mode? On NVidia or AMD?

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Yeah, I am running on Windows 11, Nvidia Geforce RTX 3060. I tried tweaking these parameters in UE4 in both Vulkan and DirextX.
I think a more likely problem would be that I am using a laptop that runs on hybrid mode (AMD Radeon/RTX 3060). This reddit post argues this, but I am not sure how relevant this post is to my problem.

But, the bigger concern is that you aren't even using Vulkan, and the fog renders for you, which is very strange.

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Oh I see the issue, in that same window make sure to enable volumetric fog! (BP_Sky, scroll down to "Volumetric Fog")

I think this might have been disabled by accident (or for performance) but it prevents fog from being rendered

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