In his 1970 book, “ The Intelligent Eye“, R. Rule received a patent for his “ Apparatus for Producing Stereographic Drawings” The difficulties encountered in hand drawing stereoscopic pairs with a pencil, straight edge, and protractor lead to a search for a mechanical drafting solution that would allow an assisted form of freehand drawing where both drawings could be made with a single stroke. “For the purposes of illustration I have employed only outline figures, for had either shading or colouring been introduced it might be supposed that the effect was wholly or in part due to these circumstances, whereas by leaving them out of consideration no room is left to doubt that the entire effect of relief is owing to the simultaneous perception of the two monocular projections, one on each retina.” On Some Remarkable, and Hitherto Unobserved, Phenomena of Binocular Vision.“: To this end he included the following explanation in his 1838 presentation to the Royal Society of London, “ Contributions to the Physiology of Vision. He was also concerned with convincing people that it was his discovery of the principle of stereopsis that created the sense of depth experienced with his stereoscope.
Wheatstone used geometric figures for clarity and the relative ease of constructing them through projective geometry techniques. The very first stereoscopic drawings were created and exhibited in 1838 by Charles Wheatstone in order to demonstrate the binocular basis of depth perception utilizing his new invention, the stereoscope. While freehand drawing and painting in stereoscopic 3D is difficult it can be done –and in fact for many years it was the only approach possible.
Jim utilizes the ‘select and shift’ method which allows for a precision as fine as single horizontal pixel shifts in sliced regions of the image. 2D to 3D conversion via a greyscale image used as a pixel displacing depth map is probably the most common contemporary method for creating 3D drawings and paintings, however many other approaches are possible. This is a copy of Jim Long’s 2D to 3D conversion of Rene Magritte’s 1966 version of his seminal 1929 painting, “ The Treachery of Images“. This is not a hand painted stereoscopic picture. The stereoscopic still image pairs embedded on this page are formatted for cross-eye free-viewing.
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