# Synopsis

PDX_MSGT gdx_EvalSurfacePnt(long option, MDA_PTR db_ptr, double uval, double vval, MTH_3DPNT point)

# Purpose

Evaluate a point on a GDX surface entity

# Description

At U and V parameter values, evaluate a point on the GDX surface entity.

# Input

## option

### GDX_UNNORM

Unnormalize the parameter values

### GDX_FROMLEFT

Evaluate the point location from the left

### GDX_FROMLOW

Evaluate the point location from the low parameter direction

## db_ptr

The GDX surface entity database pointer

## uval

The U parameter value to evaluate

## vval

The V parameter value to evaluate

# Output

## point

The XYZ 3D evaluated point location

# Return

          GDX_NOERR
          GDX_ENTITYNOTSURFACE
          Low level error return
          .fi