struct PK_range_guess_s
    {
    PK_range_guess_type_t  type;            --- form of guess
                                            --- (PK_range_guess_no_c)
    double                 parameters[2];   --- parameters        (0.0, 0.0)
    PK_VECTOR_t            vector;          --- end position (0.0, 0.0, 0.0)
    };
typedef struct PK_range_guess_s PK_range_guess_t;




This structure is used to provide an estimate of the position of an end of a
line of separation.


If the corresponding entity is a curve or an edge, then an estimate of the
curve parameter may be supplied in `parameters[0]'. If the corresponding
entity is a surface or face, then an estimate of the uv surface parameters
may be supplied in `parameters[0]' and `parameters[1]'. If the corresponding
entity is a curve, surface, edge or face then an estimate of the end position
may be provided in vector. vector is expected to be on or close to
the entity.