struct PK_TOPOL_fctab_error_facet_s
       {
       int  *facet;
       int length;
       };
typedef struct PK_TOPOL_fctab_error_facet_s
               PK_TOPOL_fctab_error_facet_t;


This is a support structure for PK_TOPOL_facet_r_t. It contains pairs of
integers which indicate whether any faults were detected during facetting.
If the table is returned empty, this denotes that no faults were found.

The first entry is an integer token of type PK_facet_fault_t.
The second is its associated facet index or a PK entity value.

first integer value in pair    second integer value in pair
---------------------------    ----------------------------

PK_facet_fault_face_c          The specified PK_FACE_t entity could not be
                               facetted using the specified mesh controls.
                               It implies that part of the generated facet
                               mesh is missing.

PK_facet_fault_facet_c         The specified facet (whose index is given) is
                               disconnected from some neighbouring facets.
                               The topology of the generated facet mesh is
                               valid but may contain superflous 'slit edges'.

PK_facet_fault_vertex_point_c  The coordinate of the specified vertex (whose
                               index is given) did not match any vertex_point
                               coordinates on adjacent faces. The facet mesh
                               may contain small gaps close to this point.

PK_facet_fault_vertex_normal_c The facet function was unable to calculate an
                               accurate surface normal value at the position
                               of the facet vertex (whose index is given).
                               The vector referenced by this vertex's
                               'vertex_normal' table should not be used.

PK_facet_fault_vertex_param_c  The facet function was unable to calculate
                               accurate parameter values at the position
                               of the facet vertex (whose index is given).
                               The uv, dp and/or the dp2 parameter values
                               referenced by this vertex's 'vertex_param'
                               table should not be used.

PK_facet_fault_thin_face_c     No facets were output for the specified
                               PK_FACE_t entity because the face is very thin.
                               Although a facet may not be output for a given
                               face, this is not an indication that facetting
                               has failed.

PK_facet_fault_body_c          The specified PK_BODY_t entity could not be
                               facetted using the specified mesh controls.  It
                               implies that no facet mesh has been generated
                               for this body.