Kinda neat. Would make for some great training videos I think.

http://www.eyetap.org/~siggraph2012/

That's amazing - that it can be done fast enough to do it real time. I liked the possibilities for adding guidance overlays (the actual vs. desired position of the welding tip for example)

That is pretty sweet. The hood just looks like a horror movie piece.

I can actually imagine a hood that your eyes never see the arc. All view screen on the inside.