A carriage moves back and forth under a vehicle and three cameras or laser
fixed along one axis pivot in a common plane, utilizing two cameras at
time to locate a target fixed to a reference point on the undercarriage
of the vehicle. Triangulation calculations, combined with the location of
the cameras provide the location of the reference point in space in a
three-dimensional coordinate system and compare that location with a
stored designed location of the reference point prior to the crash,
allowing the vehicle structure to be returned to its designed shape by
other equipment.