Synopsis

PDX_MSGT gdx_EvalPolylineDerivs(long option, T_GDX_POLYLINE *gdx_polyline, int max_deriv, double tval, double (*derivs)[3])

Purpose

Evaluate a derivatives on a GDX polyline.

Description

Given the valid GDX polyline definition and a parameter value, evaluates a derivatives on the polyline.

Input

option

GDX_UNNORM

Unnormalize the paramter value

GDX_FROMLEFT

Evaluate the derivatives from the left

gdx_polyline

The GDX polyline data structure

tval

The parameter value to evaluate

max_deriv

The maximium derivative required

Output

point

The 3D evaluated point location

derivs

The 3D deriviatives

Return

      GDX_NOERR
      GDX_PARMOUTOFRANGE
      Low level error return
      .fi