void Update()
{
Vector3 screenPos = Camera.main.WorldToScreenPoint(map.renderViewport.transform.position);
Vector3 mapPos;
if (map.GetLocalHitFromScreenPos(screenPos, out mapPos))
{
int d = map.GetCountryIndex(mapPos);
if (d != c)
{
c = d;
if (c >= 0)
{
Debug.Log("Country at center of viewport: " + map.countries [c].name);
}
}
}
}