There's an ios app called "Minecraft Reality" which uses camera tracking to put models into physical spaces. It's not seamless by any stretch (you manually down

There's an ios app called "Minecraft Reality" which uses camera tracking to put models into physical spaces. It's not seamless by any stretch (you manually download each model from a list of nearby placements before viewing) and it loses sync if the scene is changed too much, but it does a pretty good job of accurately placing the objects. I imagine that maybe taking advantage of 3d sensors like leapmotion could make it a lot more robust.