struct PK_blend_local_check_s
    {
    PK_blend_check_su_X_t  check_su_X;      --- check for self-intersecting
                                            --- surfaces
                                            --- ( PK_blend_check_su_X_no_c )
    PK_blend_check_fa_t    check_fa;        --- check individual faces
                                            --- ( PK_blend_check_fa_no_c )
    PK_blend_check_fa_fa_t check_fa_fa;     --- check for face-face
                                            --- inconsistencies
                                            --- ( PK_blend_check_fa_fa_no_c )
    };
typedef struct PK_blend_local_check_s PK_blend_local_check_t;



This structure records information specifying the amount
of local-checking which shall be performed during a blending operation.


This structure contains a collection of switches which will determine
the level of extra checking performed during a blending operation.
Switching these checks on can increase the time taken to apply a blend.

check_surf_X      controls the checking for self-intersecting surfaces.

check_fa          controls the checking whether individual faces are valid.

check_fa_fa       controls the checking for face-face inconsistencies.