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It depends what you regard as "true 3d" but there is a technique called "Light Field Display" which has been in development for some time now. Its essentially still a 2D screen but you can walk around and look at it from different angle as if it were an actual 3d object. http://gl.ict.usc.edu/Research/3DDisplay/


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Not at a usable frame rate. The fastest I'm aware of is one that updates every 2 seconds. They are also not free floating in air, but rather projected within a block of material. There is a nice article on discovery.com about the most advanced one I know of here. There are also vapor displays that can display a video floating in space, but those aren't ...



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