TARS from interstellar 3D composite

So, here is what the title promises.

I did this the last couple of days. I originally had to track the video footage for an assignment but didn't end up compositing this particular shot. After seeing interstellar and now that It is Christmas holidays I took the opportunity to attempt to insert TARS into the hallway of my university! I'm pretty happy with the way it turned out. One thing I think might have been good would be to include caustic reflections however cycles really does not handle caustics (reflect or refract) well at all.