UE4 Unreal 4.22 Preview RayTracing Setup
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1. An NVIDIA RTX graphic card
2. Windows 10 version 1809 —— (install attention)
3. Unreal Engine 4.22
4. Launch Unreal 4.22 with the « -dx12 » option
5. Project Settings — Support Compute Skincache Checked
6. Project Settings — Ray Tracing Checked
7. View Mode — Ray Tracing — Path Tracing
Source