I've seen that yeah but to me, it's overkill.* With a proper
   reference point for "THIS IS A [standard measure]" and telling
   the app that it's a square room, the rules of perspective should
   take care of the rest. I think the lasers and stuff is great for
   perfect, but if you want "good enough", I can't see why it's not
   possible.* Six years ago, I played around with a thing a college
   kid made that uses your webcam to make a 3D point cloud of your
   face and it did a decent job, considering the limited resolution
   of webcams. Somewhere in my files is ... my face in 3D :P So I
   know it's possible with just a camera and movement.* I've seen
   some that use a reference line for "this is ground"... and the
   initial rendering of a 3D obj might be taxing, but once you have
   it, then it's useable anyplace. I'm thinking next 5 years at
   most for the capability to be quick and simple.* I'm just hoping
   it comes sooner.* I'm going to try an experiment with my camera,
   spritecraft and minecraft to test a theory out, once it charges
   up again.* I'm pretty sure it'll work.