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3D Illusions The ability to see three dimensional images results from a combination of stereoscopic vision, parallax and a knowledge of the size of everyday objects. Producing an illusion of 3D from a 2D page or monitor may be done in a variety of ways.
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This is the classic way of producing artificial stereoscopy by feeding slightly different images to each eye using coloured filters. To see this you will need a pair of red/green spectacles. Use F1, F2 to change the size, arrow keys to move the image around and the mouse to rotate the cube (click and drag) |
These two images can be combined into a pseudo 3D pyramid by crossing your eyes (try looking at a pen half way between your eyes and the screen) |
This autostereogram codes 3D information as a series of superimposed layers at different apparent distances from the viewer. To see a helicopter, focus on your reflection in the monitor and become aware of the depth in the picture without restoring your gaze to the actual screen itself. |
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