When Robert Downey Jr. suffered a serious injury and had to take 6 weeks to recover, Shane Black and co. obviously kept production going on Marvel's
Iron Man threequel..but they didn't only shoot scenes without Tony Stark in them. For that last scene with Tony overlooking the beach from the ruins of his mansion for example, a body double was used and Downey Jr.'s face superimposed in much the same fashion as the "Skinny Steve" version of Chris Evans was created in
Captain America: TFA.
“Together with face replacement and full body doubles, somewhere there was a solution to the problem of not having Robert Downey Jnr on set for the time,” explains Iron Man 3's VFX supervisor Chris Townsend.
"We were able to reconstruct RDJ as Tony Stark on set, with the help of a body double and the facial captures we'd collected afterwards." I've seen the movie twice and never noticed a thing, but then I wasn't looking..did you guys pick up on anything? Read the full report at the link below.