private Vector2 WorldFromScreen(Vector2 position, ICameraModel2D cam)
{
var up = cam.GetWorldUp();
var right = new Vector2(up.Y, -up.X);
position /= cam.GetWorldZoom();
var shiftFromFocus = (position.X * right) + (position.Y * up);
return(cam.GetWorldFocus() + shiftFromFocus);
}
