For those looking to get started with Ray Tracing. Here is what you need to do to enable it and use it:
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You’ll need to be on Windows 10 Build 1809 with an RTX-20XX series card and the latest drivers.
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Use the command line argument -dx12 with UE4Editor.exe (for example, creating a shortcut and adding the arg at the end of the file path in the properties)
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In the Project Settings, the following in this order:
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Support Compute Skincache
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Ray Tracing
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Restart the Editor
From this point, you should have ray tracing enabled for your project.
You’ll find a bunch of commands under *r.RayTracing. **for different techniques. Some of which are disabled by default (like translucency and RTGI since they are still actively being worked on).
To use the Reference Path Tracer, use the level viewport and select ** Show > Ray Tracing > Path Tracing**. You can find some cvars for it under ** r.PathTracing.***