Synopsis

PDX_MSGT gdx_EvalOffsetSurfPnt(long option, T_GDX_OFFSET_SURF *gdx_offset_surf, double uval, double vval, MTH_3DPNT point)

Purpose

Evaluate a point on a GDX offset surface

Description

At a given pair of parameter values, evaluates a point on a GDX offset surface entity.

Input

option

GDX_UNNORM

Unnormalize the parameter values

GDX_FROMLEFT

Evaluate derivatives from the left

GDX_FROMLOW

Evaluate derivatives from the low parameter value

gdx_offset_surf

The GDX offset surface entity structure pointer

uval

The surface U parameter value to evaluate

vval

The surface V parameter value to evaluate

Output

point

The XYZ 3D evaluated point location

Return

      GDX_NOERR
      GDX_ENTITYNOTSURFACE
      GDX_PARMOUTOFRANGE
      Low level error return
      .fi