PK_TOPOL_fctab_fin_edge_t

struct PK_TOPOL_fcstr_fin_edge_s
       {
       int          fin;
       PK_EDGE_t    edge;
       };
typedef struct PK_TOPOL_fcstr_fin_edge_s
               PK_TOPOL_fcstr_fin_edge_t;
struct PK_TOPOL_fctab_fin_edge_s
       {
       PK_TOPOL_fcstr_fin_edge_t   *data;
       int                          length;
       };
typedef struct PK_TOPOL_fctab_fin_edge_s
               PK_TOPOL_fctab_fin_edge_t;

Used in:

PK_TOPOL_facet_table_t

This is a support structure for PK_TOPOL_facet_2_r_t.  It is a lookup table
which maps exterior fin indices into edge entity values. (i.e. it defines
which fin is derived from which PK edge entity).

NOTE: The mapping from all fins to edges is a sparse relation because interior
      fins have no association with PK edges. By excluding interior fins the
      lookup table provides a compact notation for such data.