> [No, I do not mean volumetric displays. I mean a display where you
> compute the interference patterns of an optical wavefront, then use some
> kind of display device to produce that pattern.]

A friend from university did this:

http://lightblueoptics.com/videos/holographic-laser-projection-technology/

Judging by the (lack of) recent updates it didn't really take off.

FWIW before this, his research project at university was to modify a CD 
burner to burn holograms onto a CD. I guess the "pixel pitch" on a CD is 
enough for it.

> I did see a demo of a commercial offering which is supposed to be coming
> to market soon - but it uses eye-tracking to slash the amount of
> processing power required. (I.e., it won't actually work in the real
> world and so will never be commercially viable.)

Yes, eye tracking always introduces further issues. One demo I saw, 
which I'm surprised hasn't taken off, is to use the video feed from a 
camera as an environment map texture. This demo was running on a laptop 
using the inbuilt webcam and the way shiny surfaces reflected your face 
and what was behind you in the room was very believable.

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