Structured light, infinite focus Im interested in projecting a static image across a room that stays focused over a wide range of distances from the projector, without re-adjustment, for a structured light setup.
ie, the target may move anywhere from a couple feet to 10 feet from the projector.
Is such a thing possible?  How/is this achieved in practice?
 A: 
... projecting a static image across a room that stays focused over a wide range of distances from the projector, ...

A 3D projection is created and mapped to the 2D surfaces in the room. To record the view and show it to others you simply track the position of the camera.
Here is a before view of this person's room:

Here is the room with fake wall texture and additional objects:

Here is a screenshot from part 3 of the PlayStation video listed below:

In another part his room becomes flooded and he is attacked by a sea monster:

That movie was created with a room, a RED camera, two PlayStation Move controllers, a computer, the Sony PlayStation SDK, and a film crew. The room is at least 12' x 12'.
There is relatively simple hardware available that can be assembled and controlled to produce a 3D projection mapping on the 2D surfaces in your room, it's not simple to do.


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*Microsoft explains their prototype IllumiRoom in their video: "IllumiRoom by Microsoft Research: Peripheral Projected Illusions for Interactive Experiences" which uses a wide field projector and Microsoft's Kinect sensor. It is documented on their webpage: "IllumiRoom: Peripheral Projected Illusions for Interactive Experiences" and includes a paper: "IllumiRoom: Peripheral Projected Illusions for Interactive Experiences" (7.6 MB .PDF).

*For the PlayStation advertisement "Great Films Fill Rooms" they attached the PlayStation Move controller to a camera. That permitted mixing real-time projection mapping with head tracking and camera tracking (both at once) for a sort of live match-moving-like effect. Here is the result:


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*"Most Insane Immersive Movie Experience EVER - Part 1"

*"Most Insane Immersive Movie Experience EVER - Part 2"

*"Most Insane Immersive Movie Experience EVER - Part 3"

*"The Most Immersive Movie Experience EVER -- Making Of Version"


*In the article: "Projecting 3D Objects in Mid-Air" researchers at Burton Inc explain using a laser outdoors to ionize the air and create a 3D projection mid-air without a screen. It is demonstrated in their video: "Aerial Burton 3D display projects images into mid-air #DigInfo".

*In the videos: "Pmomo: Projection Mapping on Movable 3D Object", the accompanying article: "Pmomo: Projection Mapping on Movable 3D Object" and another video: "Projection Mapping": Experimental Projector Shoots Steady Images On Moving Objects", and it's accompanying article: "Experimental Projector Shoots Steady Images Even On Moving Objects" the authors demonstrate 3D projection mapping on movable objects.
