world scale ar post

world-scale-ar-1.swift

func azimuthBetween(origin: CLLocation, destination: CLLocation) -> Float {
    var azimuth: Float = 0
    
    let originLatitude = GLKMathDegreesToRadians(Float(origin.coordinate.latitude))
    let originLongitude = GLKMathDegreesToRadians(Float(origin.coordinate.longitude))
    let destinationLatitude = GLKMathDegreesToRadians(Float(destination.coordinate.latitude))
    let destinationLongitude = GLKMathDegreesToRadians(Float(destination.coordinate.longitude))
    
    let dLon = destinationLongitude - originLongitude
    
    let y = sin(dLon) * cos(destinationLatitude)
    let x = cos(originLatitude) * sin(destinationLatitude) - sin(originLatitude) * cos(destinationLatitude) * cos(dLon)
    
    azimuth = atan2(y, x)
    
    if(azimuth < 0) { azimuth += 2 * .pi } // We only use positive values for consistency
    
    return azimuth
}