Path Tracing not enabling

Development Rendering
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1

I managed to test some RT features in 4.24 on this machine a few months ago but have not since been able to use any ray tracing or path tracing features. I am trying to use Path Tracing for high quality renders as in-game screenshots by enabling the path tracing on still frames. However no such effect appears in engine or any cooked content.

Windows version 1909, Ray Tracing has been enabled, DX12 has been set and is updated, all drivers are up to date, GPU - RTX 2060 Super, and tested in UE4 2.25.3 and 2.24.3.

Screen space RT works as intended. I’m sure my hardware is acceptable as I said I’ve enabled path tracing before on an older project (demo project from the Marketplace) so I know my computer can run it. I’m just unsure what has changed since then that would now make it unusable.

2

I have been struggling with this same problem for a couple of days. Eventually I looked in the logs and searched for ‘Raytracing’ and found the line:

LogD3D12RHI: Warning: Ray Tracing is disabled because the RenderDoc plugin is currently not compatible with D3D12 ray tracing.

I disabled RenderDoc in the project, and ray tracing began to work.

3

Yep, lost few hours too… UE loves to disable ray tracing for some reason and leave just a line in the bloated log…