Stereo vision, we referred to here is the visual expression through three-dimensional painting. Three-dimensional painting popular talk is the use of the two visual difference and optical refraction in a plane, so that people can see a three-dimensional map, painting things either protruding from the screen, but also deep which , vivid, lifelike, people with a strong visual impact. 
 Reflect the object up and down the three-dimensional image plane image essential difference, graphics, about two-dimensional relationship, people see the floor plan of a three-dimensional sense. This is mainly the use of light and shade, the actual situation, chiaroscuro to reflect, and truly three-dimensional painting is to simulate the human eyes to the world the principle of the use of optical refraction produced, it can see objects in the eye and feel from top to bottom, left and right, before and after the three-dimensional relationship. 
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