Ray Tracing support using the Vulkan RHI (4-27 & 5-0)

I come from this thread: Cast raytraced shadows and vulkan/linux

Late, but I’ve waited for bookworm.
Now I have a clean install of Debian 12 with the repo nvidia driver (525) and the UE5.2.1 downloaded by the ue site.

I check all the parameters mentioned in this thread, you can find in the screenshots.

As stated by @focalcgi there’s a clear warning message, complaining the failing of the compilation of the material for the platform VULKAN_SM5.

Is it the problem that creates those horrible shadows?

Any idea on how to proceed?

An other note, if I click on “Path tracing debug” and I choose an option what I see it’s a black screen, same problem I suppose.