public void RemoveActor(UnrealActor actor)
{
if (isReadOnly)
{
throw new InvalidOperationException("This map cannot be modified because it is read-only");
}
else
{
if (actor is UnrealBrush)
{
brushes.Remove(actor as UnrealBrush);
}
actors.Remove(actor);
actor.RemoveOwner(this);
}
}
