Positioning Hot Spots by location

using System;
using InfinityCode.uPano;
using InfinityCode.uPano.HotSpots;
using UnityEngine;

public class CreateHotSpotByLocation : MonoBehaviour
{
    public double panoLongitude;
    public double panoLatitude;
    public float panoAltitude;

    public double hotSpotLongitude;
    public double hotSpotLatitude;
    public float hotSpotAltitude;

    public GameObject hotSpotPrefab;
    private HotSpot hotSpot;

    private void Start()
    {
        HotSpotManager hotSpotManager = GetComponent<HotSpotManager>();
        hotSpot = hotSpotManager.Create(0, 0, hotSpotPrefab);
        UpdatePosition(hotSpot, hotSpotLongitude, hotSpotLatitude, hotSpotAltitude);
    }

    private void UpdatePosition(HotSpot hotSpot, double longitude, double latitude, float altitude)
    {
        double tx1, tx2, ty1, ty2;
        GeoHelper.CoordinatesToTile(panoLongitude, panoLatitude, 20, out tx1, out ty1);
        GeoHelper.CoordinatesToTile(longitude, latitude, 20, out tx2, out ty2);

        double distance = GeoHelper.Distance(panoLongitude, panoLatitude, longitude, latitude) * 1000;

        float pan = 90 + (float) MathHelper.Angle2D(tx1, ty1, tx2, ty2);
        float tilt = 0;

        float offset = altitude - panoAltitude;
        if (Math.Abs(offset) > float.Epsilon)
        {
            tilt = (float)Math.Atan2(offset, distance) * Mathf.Rad2Deg;
        }

        hotSpot.SetPanTilt(pan, tilt);
    }
}