size(vgrext); int32 = class(vgrext)

      cgscal     Coarse voxel grid scale.  The extent of the fine voxel
                 grid is related to the extent of the coarse voxel grid by
                 this scale factor.

                 [1,1] = size(cgscal); int32 = class(cgscal)

      vtxnpl     Vertex-plate correspondence list size.

                 [1,1] = size(vtxnpl); int32 = class(vtxnpl)

      voxnpt     Size of the voxel-to-plate pointer list.

                 [1,1] = size(voxnpt); int32 = clas