Returns a dictionary object with keys that are 2tuples
        represnting a point.

def CreateVertices(self, points):
        """
        Returns a dictionary object with keys that are 2tuples
        represnting a point.
        """
        gr = digraph()

        for z, x, Q in points:
            node = (z, x, Q)
            gr.add_nodes([node])

        return gr