1. A method for obtaining features from a three-dimensional object, wherein said features correspond to an original three-dimensional object, said method comprising: obtaining anchor vertices among a plurality of vertices representing said three-dimensional object whose local neighborhood is close to a set of target shapes; fitting a reference shape onto said anchor vertices; obtaining said features using said fitted reference shape; wherein each anchor vertex corresponds to a vertex among a plurality of vertices representing the original object at the intersection between said reference shape and said original three-dimensional object.