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- (float)angleFromCoordinate:(CLLocationCoordinate2D)first toCoordinate:(CLLocationCoordinate2D)second { //first is origin //second is point float longitudinalDifference = second.longitude - first.longitude; float latitudinalDifference = second.latitude - first.latitude; float possibleAzimuth = (M_PI * .5f) - atan(latitudinalDifference / longitudinalDifference); if (longitudinalDifference > 0) { return possibleAzimuth; } else if (longitudinalDifference < 0) { return possibleAzimuth + M_PI; } else if (latitudinalDifference < 0) { return M_PI; } return 0.0f; } The code above (taken from the open source ARkit project) calculates an angle from a point of interest to a point of origin (the user location). Given the azimuth (heading) calculated in radians, in the AR app im building I can detect whether a point is within its view port using the following code: - (BOOL)viewportContainsCoordinate:(ARCoordinate *)coordinate { double centerAzimuth = self.centerCoordinate.azimuth; double leftAzimuth = centerAzimuth - VIEWPORT_WIDTH_RADIANS / 2.0; if (leftAzimuth < 0.0) { leftAzimuth = 2 * M_PI + leftAzimuth; } double rightAzimuth = centerAzimuth + VIEWPORT_WIDTH_RADIANS / 2.0; if (rightAzimuth > 2 * M_PI) { rightAzimuth = rightAzimuth - 2 * M_PI; } BOOL result = (coordinate.azimuth > leftAzimuth && coordinate.azimuth < rightAzimuth); //THIS LINE if(leftAzimuth > rightAzimuth) { result = (coordinate.azimuth < rightAzimuth || coordinate.azimuth > leftAzimuth); } double centerInclination = self.centerCoordinate.inclination; double bottomInclination = centerInclination - VIEWPORT_HEIGHT_RADIANS / 2.0; double topInclination = centerInclination + VIEWPORT_HEIGHT_RADIANS / 2.0; //check the height. result = result && (coordinate.inclination > bottomInclination && coordinate.inclination < topInclination); //NSLog(@"coordinate: %@ re

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