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Use this function to change the value of a specific point on the track.
Parameters:
track_handle: The track handle
point_index: A value between 0 to (STATE_track_get_number_of_points() -1 )
pt: The X,Y,Z values to set for the given point index.
Return value:
VR_ERROR if the failed (our of range index)
OK otherwise.
See also: STATE_track_insert_point(), STATE_track_add_point_to_end()
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