struct PK_BODY_loft_end_conds_s
    {
    PK_PARAM_periodic_t         periodic;
    PK_BODY_loft_deriv_conds_t  start,
                                end;
    };

typedef struct PK_BODY_loft_end_conds_s PK_BODY_loft_end_conds_t;



This structure holds controls on the behaviour of the lofted surfaces at
the end profiles. These include control of periodicity and the first and
second derivatives of the lofted surfaces in the loft direction.


The end conditions structure has the following fields :

periodic      Set to PK_PARAM_periodic_yes_c if and only if the start
                profile is also to be the end profile, and the lofted
                surfaces are to be periodic in the loft direction. Otherwise
                this must be set to PK_PARAM_periodic_no_c

start         Gives the constraints on the first and second derivatives
                in the loft direction across the start profile.

end           Gives the constraints on the first and second derivatives
                in the loft direction across the end profile.