# Synopsis

PDX_MSGT gdx_ApplyMatrixApprox3DPnts(long option, long npnts, long start_pnt_ndx, GDX_MATRIX matrix)

# Purpose

Apply GDX matrix the list of 3D approximation points.

# Description

This function will apply the linear 3X4 matrix to the linear approximation 3D points. The start_pnt_ndx + npnts must be less than the total number of approximation points. (See gdx_GetNumOfApproxPnts)

# Input

## option

### GDX_TRANSPOSE

Use transpose of matrix

## npnts

Number of approximation points to apply matrix to

## start_pnt_ndx

The approximation point index to start transforming

## matrix

The linear 3X4 GDX matrix to apply

# Return

          GDX_NOERR
          GDX_TOOMANYPNTS
          Low level error return
          .fi