1 ) Apparatus for creating computer models comprising: an electronic camera; position and attitude measurement apparatus; a display; and a computer operable for: running CAD software, acquiring images from said electronic camera, receiving position and attitude information relating to a present system position and attitude of said electronic camera, computing perspective adjustments, combining imagery from said electronic camera with imagery from said CAD software, displaying combined imagery at said display; said electronic camera, position and attitude measurement apparatus each in communication with said computer.