Hi Tadas,
To activate measurement tool in the viewer, you will need to define the Accuracy field in the Exposure Points feature service.
You can get more detail about the accuracy parameter and how it can be defined from this documentation.
Documentation Link - oriented-imagery/OrientedImageryCatalog_Schema.pdf at master · Esri/oriented-imagery · GitHub
Also, here is the snippet
You can put dummy value for Accuracy field - 0.5,0.5,1,1,1,1,1,1 to quickly test the measurement capability.
You can also define the Accuracy in OIC (See below)
{"type": "OIC", "version": "2.1", "properties": {"Name": "test8", "Description": "test", "Tags": "OrientedImagery", "ServiceURL": "https://services6.arcgis.com/YtqGNFEdrYd1pjuW/arcgis/rest/services/test8_ExposurePoints/FeatureServe...", "OverviewURL": "https://tiles.arcgis.com/tiles/YtqGNFEdrYd1pjuW/arcgis/rest/services/test8_CoverageMap/VectorTileSer...", "DefaultAttributes": {"CamHeading": "", "CamPitch": "", "CamRoll": "0", "HFOV": "", "VFOV": "", "AvgHtAG": "", "FarDist": "", "NearDist": "", "OIType": "T", "SortOrder": "", "CamOffset": "", "Accuracy": "0.5,0.5,1,1,1,1,1,1", "ImgPyramids": "", "DepthImg": "", "ExternalViewer": "", "ImgRot": "", "ImageryType": "Aerial Oblique Camera"}, "About": "", "ImageField": "", "ImagePrefix": "", "VideoPrefix": "", "DepthImagePrefix": "", "SourceImagePrefix": "", "MaxDistance": "", "DEMPrefix": "I||https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer", "Credentials": {"Username": "", "Password": ""}, "Variables": {}, "Filters": {}, "Copyright": {"text": "test", "url": ""}, "PointsSource": "D:\\Temp\\oblique\\oblique\\orient_test\\test8.gdb\\test8_ExposurePoints", "CoverageSource": "D:\\Temp\\oblique\\oblique\\orient_test\\test8.gdb\\test8_CoverageMap"}}
Thank You.
Kushagra Patel