code: function() {
          var newSel = [];
          var vertices = this.mesh.getVertices();
          var l = vertices.length;
          for (var i=0;i<l;i++) {
  			var v = vertices[i];
              if (this.selection.indexOf(v) < 0 ) {
                  newSel.push(v);
              }
          }
          this.selection = newSel;
          return this;
      }
docs: Creates a new selection of all vertices NOT currently selected.
  @return itself