1. A method of processing vertex data, the method comprising: receiving vertex data for a plurality of vertices; identifying a first subset of the plurality of vertices symmetrical to one or more other subsets of the plurality; creating a set of control data including parameters for reconstructing at least a part of the one or more other subsets using vertex data for the first subset; and computing additional vertices using the control data and the vertex data for the first subset to thereby reconstruct at least a part of the one or more other subsets.