PK_ERROR_code_t PK_FIN_find_surf_parameters
(
--- received arguments ---
PK_FIN_t        fin,          --- fin
double          t,            --- t parameter on curve attached to fin
PK_LOGICAL_t    estimate,     --- whether parms_est is supplied
PK_UV_t         parms_est,    --- estimate of u,v parameters

--- returned arguments ---
PK_UV_t  *const parms         --- u,v parameters on surface attached to fin
)


This function computes fin surface parameters corresponding to the given
curve parameter.


Specific Errors:
    PK_ERROR_missing_geom           the given fin has no associated curve
    PK_ERROR_bad_parameter          not coincident with curve and surface


The function returns the parameter points (u,v) on the surface connected to
the given fin that correspond to the parameter t on the curve of fin.
Parameter points must lie on both the curve and the surface that are attached
to fin.

fin can be attached to a tolerant or untoleranced edge.

If estimate is PK_LOGICAL_true, parms_est will be used as an
estimate of u and v parameters.