procedure AssignArray( const AItemsArray: array of TX3DNodeClass);
function IndexOf(NodeClass: TX3DNodeClass): Integer; overload;
function IndexOf(Node: TX3DNode): Integer; overload;
Equivalent to IndexOf(NodeClass.ClassType), taking care of necessary typecasts.
function IndexOfAnyAncestor(Node: TX3DNode): Integer;
Looks for a node class that is ancestor of given Node, in other words that satisfies the Node is Items[Result] condition. Contrast this with IndexOf method, which looks only for an exact class match.