We dene L, a RingLayerDescription (RLD) of the shape
S as a triple (r; n; h) representing a ring R with radius r
and overlaid parallel to the shape plain with the height h.
The ring will be represented by m points taken uniformly
distant from each other on R. Concatenating all V iew0j
s of
each view point rj in the ring R will generate one feature
vector FV (L) representing a full descriptor of the shape S