Synopsis

PDX_MSGT gdx_EvalParmSplSurfPnt(long option, T_GDX_SPLINE_SURF *gdx_ss, double uval, double vval, MTH_3DPNT point)

Purpose

Evaluate a point on a parametric spline surface.

Description

Given the GDX parametric spline surface and a U and V parameter value evaluates a point on the surface at the given UV parameter value.

Input

option

GDX_UNNORM

Unnormalize the parameter values

GDX_FROMLEFT

Evaluate derivatives from the left

GDX_FROMLOW

Find the knot span from the low direction

gdx_ss

The GDX parametric spline surface data structure

uval

U surface parmeter value

vval

V surface parmeter value

Output

point

Resulting point

Return

      GDX_NOERR
      GDX_PARMOUTOFRANGE
      Low level error return.
      .fi