formZ SDK | 5.0 API Reference | System | Nurbs Surface

# fz_nsrf_evaluate_derivatives_at_parm

Description

Evaluates the position, tangent and normal on a NURBS surface given [u,v].

Plugin Prototype

fzrt_error_td fz_nsrf_evaluate_derivatives_at_parm(

fz_nurbs_srf_ptr | srf,
double | uu,
double | vv,
fz_xyz_td * | point,
fz_xyz_td * | u_tangent,
fz_xyz_td * | v_tangent,
fz_xyz_td * | normal )

Parameters

srf [Input]

NURBS surface

uu [Input]

parameter in U

vv [Input]

parameter in V

point [Result]

Point on surface

u_tangent [Result]

Tangent vector in U

v_tangent [Result]

Tangent vector in V

normal [Result]

Normal on surface

Returns

Error codes

Availability

5.0.0.0

Example Files

util_nsrf.fsl

See Also

Function Set

fz_nsrf_fset

Defined in

fz_nsrf_api.h