Sorry the previous code was the old version, the rest of the lines are not suppose to have ! Anyway I tried and indeed found that it is complaining the scene is not found from the console output. couldn't find scene: art.scnassets/Pokeball.scn How can it failed to find the file?

Sorry to answer my own question, I have got it working. I think they not only changed the naming, but also changed how the function is called. Lastly, wrist is no longer a joint group name, so you can just obtain the point "wrist" instead of obtaining the group first. For these who are interested:        try handler.perform([handPoseRequest])       // Continue only when a hand was detected in the frame.       // Since we set the maximumHandCount property of the request to 1, there will be at most one observation.       guard let observation = handPoseRequest.results?.first else {         self.state = "no hand"         return       }       // Get points for thumb and index finger.       let thumbPoints = try observation.recognizedPoints(VNHumanHandPoseObservation.JointsGroupName.thumb)       let indexFingerPoints = try observation.recognizedPoints(VNHumanHandPoseObservation.JointsGroupName.indexFinger)       let middleFingerPoints = try observation.recognizedPoints(VNHumanHandPoseObservation.JointsGroupName.middleFinger)       let ringFingerPoints = try observation.recognizedPoints(VNHumanHandPoseObservation.JointsGroupName.ringFinger)       let littleFingerPoints = try observation.recognizedPoints(VNHumanHandPoseObservation.JointsGroupName.littleFinger)       let wristPoint = try observation.recognizedPoint(VNHumanHandPoseObservation.JointName.wrist)               // Look for tip points.       guard let thumbTipPoint = thumbPoints[.thumbIP],          let thumbIpPoint = thumbPoints[.thumbIP],          let thumbMpPoint = thumbPoints[.thumbMP],          let thumbCMCPoint = thumbPoints[.thumbCMC] else {         self.state = "no tip"         return       }               guard let indexTipPoint = indexFingerPoints[.indexTip],          let indexDipPoint = indexFingerPoints[.indexDIP],          let indexPipPoint = indexFingerPoints[.indexPIP],          let indexMcpPoint = indexFingerPoints[.indexMCP] else {         self.state = "no index"         return       }               guard let middleTipPoint = middleFingerPoints[.middleTip],          let middleDipPoint = middleFingerPoints[.middleDIP],          let middlePipPoint = middleFingerPoints[.middlePIP],          let middleMcpPoint = middleFingerPoints[.middleMCP] else {         self.state = "no middle"         return       }               guard let ringTipPoint = ringFingerPoints[.ringTip],          let ringDipPoint = ringFingerPoints[.ringDIP],          let ringPipPoint = ringFingerPoints[.ringPIP],          let ringMcpPoint = ringFingerPoints[.ringMCP] else {         self.state = "no ring"         return       }               guard let littleTipPoint = littleFingerPoints[.littleTip],          let littleDipPoint = littleFingerPoints[.littleDIP],          let littlePipPoint = littleFingerPoints[.littlePIP],          let littleMcpPoint = littleFingerPoints[.littleMCP] else {         self.state = "no little"         return       }