/// <summary>
/// Add the child nodes
/// </summary>
public void AddChildren()
{
if (Nid >= _tree.FirstLeafNodeId)
{
return;
}
var splitBounds = GetSplitBounds(1);
var childId = Nid * 2;
_tree.Nodes[childId] = new SbnNode(_tree, childId++, splitBounds[0], splitBounds[1], splitBounds[2], splitBounds[3]);
Child1.AddChildren();
splitBounds = GetSplitBounds(2);
_tree.Nodes[childId] = new SbnNode(_tree, childId, splitBounds[0], splitBounds[1], splitBounds[2], splitBounds[3]);
Child2.AddChildren();
}