I am using 5.0.3 on linux and tried a unbounded post process volume to test out ray tracing. There is no discernible change even when we enable the ray tracing (or path tracing) features. Also the official docs state that Windows 10 1809 or later is needed for path tracing.
I also noticed that Vulkan’s ray tracing extensions like VK_KHR_acceleration_structure and VK_KHR_ray_tracing_pipeline are found but are not being used by UE. This was verified by checking the application startup logs. 5.0 release notes mention that Vulkan ray tracing can be enabled by setting console variable r.Vulkan.ExperimentalRayTracing but it doesn’t mention the supported platforms. I am guessing it only works on windows because I couldn’t find that console variable on linux.
Considering all this, is it safe to assume that hardware ray tracing is not supported on linux even in UE 5.0 or UE 5.1?