private static void WriteMapBase(BinaryWriter bw, MapObject obj)
{
bw.Write(obj.Visgroups.Except(obj.AutoVisgroups).FirstOrDefault());
bw.WriteRGBColour(obj.Colour);
bw.Write(obj.Children.Count);
foreach (var mo in obj.Children)
{
WriteMapObject(bw, mo);
}
}