# Synopsis

PDX_MSGT gdx_ApproxSurface(long option, MDA_PTR db_ptr)

# Purpose

Linear approximate GDX surface entity

# Description

Perform linear approximation of a GDX surface entity within the GDX linear approximation subsystem workspace. The GDX linear approximation must have been previously allocated before approximation can be performed (See gdx_AllocateApprox).

# Input

## option

Not used

## db_ptr

The GDX surface entity database pointer

# Tolerances

          CONVERGE_TOL
          ZERO_TOL
          MODEL_SPACE_PNT_TOL
          PARM_SPACE_PNT_TOL
          PNT_PROJ_TOL
          ANGLE_TOL
          COLLINEAR_TOL
          COPLANAR_TOL
          .fi

# Return

          GDX_NOERR
          Low level error return
          .fi