A method of creating a 21/2D solid model picture in which a stereoscopic image is identified as a series of depth slices and the resulting slice data is built up to a 21/2D model using appropriate computer software. The method compares a stereoscopic pair at a relative lateral position and identifies those points of coincidence so as to create a slice through the picture at a depth corresponding to that particular relative lateral position. The pair is then moved laterally relative to each one another by an amount equal to the minimum detectable parallax and the comparison is repeated as often as is required to identify points of coincidence at all parallax depths or slices of the stereoscopic picture. The 21/2D solid model image is then built by using the obtained slice data.