struct PK_CURVE_make_approx_o_s
    {
    int                 o_t_version;    --- version number of option structure
    PK_CURVE_approx_t   approx_type;    --- approximation type
                                        --- ( PK_CURVE_approx_arclength_c )
    double              tolerance;      --- tolerance ( 0.00001 )
    };

typedef struct PK_CURVE_make_approx_o_s PK_CURVE_make_approx_o_t;



This options structure holds optional controls for PK_CURVE_make_approx.


 Description of fields:

o_t_version           Version number of option structure.

approx_type           Curve approximation type. Permitted
                        values are:
                            PK_CURVE_approx_arclength_c
                            PK_CURVE_approx_even_c.
                        The default is
                        PK_CURVE_approx_arclength_c.

tolerance             Tolerance. This is new curve fit tolerance.
                        Default is 0.00001.