vrnode object is valid,
0 if not
x = isvalid(vrnode_object_vector)
Name of an array of
This method returns an array that contains
1 when the elements of
vrnode_object_vector are valid
vrnode objects, and
0 when they are not.
vrnode object is considered valid if the following conditions are
The parent world of the node exists.
The parent world of the node is open.
The node with the given
vrnode handle exists in the parent