I have the same issue on iMac (Retina 5k, 27-inch, 2017). Video is Radeon Pro 570 which supports shader-based ray-tracing but does not support DirectX DXR or Nvidia's RTX branded ray-tracing technique. The card passes Metal API validation but fails at the Raytracing issue. 2021-11-03 13:23:21.490807+1030 HelloPhotogrammetry[34739:1125528] [HelloPhotogrammetry] Using configuration: Configuration(isObjectMaskingEnabled: true, sampleOrdering: RealityFoundation.PhotogrammetrySession.Configuration.SampleOrdering.unordered, featureSensitivity: RealityFoundation.PhotogrammetrySession.Configuration.FeatureSensitivity.normal) 2021-11-03 13:23:21.545091+1030 HelloPhotogrammetry[34739:1125528] Metal API Validation Enabled 2021-11-03 13:23:21.730644+1030 HelloPhotogrammetry[34739:1125528] [HelloPhotogrammetry] Error creating session: cantCreateSession("A GPU with supportsRaytracing is required.") Program ended with exit code: 1