1. A method of deriving a directional structure from an object dataset: the object dataset assigning local directions to positions in a multidimensional geometrical spaces; the method comprising the steps of: selecting at least one region of interest in the multi-dimensional geometrical space on the basis of spatial functional information; selecting candidate positions in the selected region of interests establish the directional structure on the basis of: dominant local directions at the candidate positions, and relative locations of these candidate positions in the multi-dimensional geometrical space.