PK_ERROR_code_t PK_BSURF_make_bcurve_u_isoparam
(
--- received arguments ---
const PK_BSURF_t      bsurf,    --- b-surface
const double          param,    --- u parameter

--- returned arguments ---
PK_BCURVE_t    *const bcurve    --- b-curve
)


This constructs a b-curve along a constant 'u' parameter
line using the 'v' parameter interval of the b-surface.


Specific Errors:
    PK_ERROR_bad_parameter          parameter out of the 'u' range of bsurf
    PK_ERROR_cant_make_bspline      cannot make constant param line from bsurf


The constructed b-curve is attached to the owner part or partition
of the supplied b-surface.