# Synopsis

(macro) void gdx_SetApproxSegStartPnt(long option, long seg_start_pnt_ndx)

# Purpose

Sets the linear approximation 3D segment start point indicator

# Description

Sets the 3D point segment start point indicator to indicate the start of a new 3D linear approximation point segment for the current GDX linear approximation workspace. No error checking is performed and it is assumed that a workspace is currently allocated.

# Input

## option

Not used

## seg_start_pnt_ndx

The index of the 3D linear approximation point that will start a new segment