PK_blend_group_rib_t    


typedef int PK_blend_group_rib_t;


This data type selects how max_n_ribs limits the number of ribs to be
returned.  It has three values:

    PK_blend_group_rib_no_c        don't group ribs
    PK_blend_group_rib_by_face_c   group ribs by blend face
    PK_blend_group_rib_by_parms_c  group ribs by parameter intervals on spine