I use raytracing in Unreal 4 but it is completely disabled in Unreal 5
I opened a new project with raytracing capability
Also, the lightmass gpu is disabled for me
yeah doesnât work with my 1080ti either. I suspect that they disabled it for 10xx graphics cards. Lots of raytracing features is also labeled as deprecated in the engine, which is disappointing, unless they have other raytracing features planned, either implementing Nvidiaâs solution, or refactoring their own.
I have GTX1660 and my 4.XX projects with RT enabled worked in 5.0 (I had RT reflections and all), but⌠something went wrong and now when I open any of those projects UE5 crashes all the time.
Looks like I found a workaround. Open 4.XX and create a new project with Ray Tracing ON. Load the project and enable RT reflections (optional?). Save the project, close 4.XX and then open the project with UE5 (open copy). Wait through the Unreal Engine cancer aka shader compiling and you should end up with a project with working ray tracing.
Change to Lumen in both Global Illumination and Reflections. It will allow you to choose your configurations to both Hardware Raytracing and Software Raytracing.
It may not be because youâre on a 10 series card. Iâm using my 3070 laptop at the moment and it seems to have bugged and wont let me check the âUse Hardware Ray Tracing when availableâ box anymore. I was able to do it once, but it crashed when it relaunched and attempted to build shaders. Something is buggy with it.
Nvidia gtx 1000 series have only emulated ray tracing, which is so slow that it gives a very poor experience out of the box. You can use ray tracing anyway with r.D3D12.DXR.AllowEmulatedRayTracing=1 in ConsoleVariables.ini
I have GTX 960M and hardware ray tracing works in UE5 to my surprise. In a simple scene, I get about 20 - 25 FPS in the editor. When I switch to Lumen, the FPS drops to about 17 FPS.
Thereâs a difference in quality especially in reflections when I switch between them via the Post Process Volume. Still playing around with the settings to learn the difference.