struct PK_FACE_intersect_face_o_s
    {
    int             o_t_version;    --- version number of option structure
    PK_LOGICAL_t    have_box;       --- whether box provided (PK_LOGICAL_false)
    PK_BOX_t        box;            --- box of interest
    PK_LOGICAL_t    have_uvbox_1;   --- whether box provided for face_1
                                    --- (PK_LOGICAL_false)
    PK_UVBOX_t      uvbox_1;        --- uvbox for face_1
    PK_LOGICAL_t    have_uvbox_2;   --- whether box provided for face_2
                                    --- (PK_LOGICAL_false)
    PK_UVBOX_t      uvbox_2;        --- uvbox for face_2
    PK_LOGICAL_t    have_vector;    --- whether seed vector provided
                                    --- (PK_LOGICAL_false)
    PK_VECTOR_t     vector;         --- only return branch containibg the seed
    };

typedef struct PK_FACE_intersect_face_o_s PK_FACE_intersect_face_o_t;



Holds optional controls on intersections between two faces.


The option structure defines options applicable to the intersection of two
faces.