Synopsis

PDX_MSGT gdx_EvalParmSplDerivs(long option, T_GDX_SPLINE_CURVE *gdx_parm_spline, int max_deriv, double tval, double (*derivs)[3])

Purpose

Evaluate derivatives on a GDX parametric spline.

Description

For a given S parameter value, evaluates the derivatives on a GDX parametric spline. The parameter values are the unnormalized spline parameter values by default.

Input

option

GDX_UNNORM

Unnormalize the parameter value

GDX_FROMLEFT

Evaluate derivatives from the left side

gdx_parm_spline

The GDX parametric spline data structure.

max_deriv

The maximium deriviative desired

tval

The parameter value

Output

derivs

The 3D deriviatives

Return

      GDX_NOERR
      GDX_PARMOUTOFRANGE
      .fi