When it comes to the cooler details in sci-fi movies, Iron Man's HUD takes the cake. Something about the way it pops up, shields the face and moves... it's crazy and unreal, yet totally believable. John Likens posted this video breaking down the visual effects of the HUD. The HUD was generated and rendered from CINEMA 4D. According to Likens:
Marvel tasked us with designing all the elaborate 3D head-up displays (HUDs) – a virtual graphical interface that Iron Man sees from within the helmet environment of his armored suits that communicate essential data and statistics ranging from his physical condition to weapon and navigational diagnostics – While putting strong emphasis on the new ultra-high-tech Mark 42 suit, we also delivered upgraded HUDs to match the new suits seen in the film. It was great fun.
Check out the video below:

IRON MAN 3 : HUD + GFX PROCESS REEL from Johnny Likens on Vimeo.