The so-called naked eye 3D map is actually based on the principle of stereoscopic imaging produced, the method of looking at the map is simply to adjust the focus of the intersection of the line of sight when the distance. For example, we usually look at an ordinary picture, the focus is on this picture, while the parallel eye focus is in the back of the picture (far away), the focal length of the distance depending on the actual situation of the picture. Cross-eye (commonly known as cock-eye) is the opposite of parallel eye, the focus is in front of the picture (near). Parallel eye and cross-eye together called "3D eye", when you use 3D eye to see the stereo picture, you will find a very new world in front of you!

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