I found the reason: bSupportsRayTracingShaders is false before UE5.5, and Vulkan_SM6 in UE5.5 is OK. You can find info in DataDrivenPlatformInfo.ini about any platform in Engine/Config/.
I found the reason: bSupportsRayTracingShaders is false before UE5.5, and Vulkan_SM6 in UE5.5 is OK. You can find info in DataDrivenPlatformInfo.ini about any platform in Engine/Config/.