CoordinatesPosition.swift

import CoreLocation
import RealityKit
import RealityKitContent
import SwiftUI

struct ImmersiveView: View {

  var body: some View {
    RealityView { content in
      if let earthEntity = try? await Entity(named: "Earth", in: realityKitContentBundle) {
        content.add(earthEntity)
        earthEntity.position.y = 1
        earthEntity.position.z = -1
       
        let berlinPosition = coordinatesToCartesian(coordinate: .init(latitude: 52.5200, longitude: 13.4050), radius: 0.55)
        let pinEntity = ModelEntity(mesh: .generateSphere(radius: 0.01))
        pinEntity.position = berlinPosition
        earthEntity.addChild(pinEntity)

        let laHabanaPosition = coordinatesToCartesian(coordinate: .init(latitude: 23.1136, longitude: -82.3666), radius: 0.55)
        let pinEntity2 = ModelEntity(mesh: .generateSphere(radius: 0.01))
        pinEntity2.position = laHabanaPosition
        earthEntity.addChild(pinEntity2)
      }
    }
  }

  func coordinatesToCartesian(coordinate: CLLocationCoordinate2D, radius: Float) -> SIMD3<Float> {
    /// φ (phi) is the latitude in radians.
    let phi = Float(coordinate.latitude) * .pi / 180

    /// λ (lambda) is the longitude in radians.
    let lambda = Float(coordinate.longitude) * .pi / 180

    let x = radius * cos(phi) * cos(lambda)
    let y = radius * cos(phi) * sin(lambda)
    let z = radius * sin(phi)

    return SIMD3<Float>.init(x: x, y: y, z: z)
  }
}