static public RectTree <T> CreateQuadtree(Rect bounds, int depth, int target_number_items, Operation <Rect, T> operation, IEnumerable <T> items)
{
RectTree <T> tree = CreateQuadtree(bounds, depth, target_number_items, operation);
tree.AddRange(items);
return(tree);
}
static public void AddRange <T>(this RectTree <T> item, params T[] to_add)
{
item.AddRange((IEnumerable <T>)to_add);
}