I have the same issue with an iMac 2017. Displays this when I try to start the app : 21-09-23 13:57:51.044611+0200 HelloPhotogrammetry[4417:119061] [HelloPhotogrammetry] Using configuration: Configuration(isObjectMaskingEnabled: true, sampleOrdering: RealityFoundation.PhotogrammetrySession.Configuration.SampleOrdering.sequential, featureSensitivity: RealityFoundation.PhotogrammetrySession.Configuration.FeatureSensitivity.normal) 2021-09-23 13:57:51.069307+0200 HelloPhotogrammetry[4417:119061] Metal API Validation Enabled 2021-09-23 13:57:51.087497+0200 HelloPhotogrammetry[4417:119061] [HelloPhotogrammetry] Error creating session: cantCreateSession("A GPU with supportsRaytracing is required.") Program ended with exit code: 1