How to look at photos (at what angle) will produce a three-dimensional effect?

Binocular viewing effect: Binocular viewing of a three-dimensional object will produce different images, which is the basis of stereoscopic viewing effect.

Using a dual-lens stereo camera, you can take two photos of a stereo object at the same time. When watching, the left and right eyes look at two photos respectively, and the two images overlap, so that the stereoscopic effect can be seen. Ordinary cameras can also take two pictures of stereo photo by connecting stereo cameras with accessories, or by shooting the displacement of still life twice. See the following figure (the left picture seen by the left eye and the right picture seen by the right eye overlap each other through gazing and eye alignment, which will have a stereoscopic effect): /eqspace/tianzh@bjmu.edu.cn (The stereoscopic test is appropriate. jpg)