The whole sequence took my 2 weeks to complete. during the work the biggest challenge for me was rigging because of industrial design of Iron Man. (mostly his large legs :)
To rig the model i've used Ab Autorig script for Maya and the result was quite good. of course i had to modify the rig later.
For render i've used V-ray for Maya and 8 different passes to composite.
the final compositing and post effects were done in After Effects.
I hope you enjoy it.