struct PK_SURF_make_sheet_trimmed_o_s
    {
    int                    o_t_version;     --- option structure version
    PK_LOGICAL_t           check_wires;     --- identify wire topology
                                            --- (PK_LOGICAL_false)
    PK_LOGICAL_t           check_self_int;  --- check for self-intersection
                                            --- (PK_LOGICAL_false)
    PK_LOGICAL_t           check_loops;     --- check for loop consistency
                                            --- (PK_LOGICAL_false)
    };

typedef struct PK_SURF_make_sheet_trimmed_o_s
               PK_SURF_make_sheet_trimmed_o_t;



Holds optional controls for making a sheet body from a surface and a set
of sp-curves


The option structure defines options applicable to making a sheet body
from a surface and a set of sp-curves