The Mind Stone within Scarlet Witch manifesting outward due to her grief, re-creating not only Vision but turning the entire town of Westview into her idyllic, sitcom-inspired home. As was the case for The Mandalorian, a Disney+ documentary - titled Assembled, is showing just how the series, its setting, and characters were brought to life.
Although the doc doesn't contain any major reveals, it is an interesting look at how WandaVision was made, especially since this is far from a normal MCU production. Aping the stylings of sitcoms from the 1950s and '60s, for instance, meant utilizing old school wire tricks and building sets to be used in front of a live studio audience, inspired by The Dick van Dyke Show (with advice from the man himself). Marvel tried to take every consideration into , even changing the TV sets S.W.O.R.D. used and how the magnetic fields would appear in each era, and that even had to go as far as Vision's appearance.
For much of its run, WandaVision was able to stick with the MCU's established process for bringing Vision to life. That is, putting Paul Bettany in the costume and make-up, including painting his face the same color as Vision's "flesh", and then stripping parts of it back to augment with CG on top, completing his synthezoid look. Assembled: The Making of WandaVision gives a good look at Bettany at the beginning of the process, which looks rather amusing due to the fact his ears are left untouched. Things had to go further, though, for the 1950s and 60s episodes because they were in black-and-white. The special effects team realized that Vision's purple skin didn't transition well into black-and-white, testing with footage from past MCU movies but finding it didn't look like him., Because of that, they tried out a few options until they found the correct shade of blue that would allow for his appearance to look right when stripped of its color. This is similar to techniques actresses of the time would rely on (albeit without the CGI part), such as using blue lipstick so that it would appear red on screen.
Click here to watch Marvel Makeup So Good You Thought It Was CGI at YouTube
The way Vision is brought to life allows marvel to keep as much of Bettany's performance as possible, painting out his ears and layering the effects on top, but otherwise keeping his physical performance. This was particularly important to get right because he is at the heart of the show, and because director Matt Shakman stressed the need to have him appear as Vision even when at home with the Scarlet Witch, rather than scenes where it might've been easier (and quicker and cheaper) to have him in his human form. Tara DeMarco, a Visual Effects Supervisor on WandaVision, said:
"We would go back to Matt and say 'do you know, for this beat, does he really need to be synthezoid? Could he be human?' And Matt and Jac [Schaefer, WandaVision's head writer] would often come back with 'Well he's his true self, you know when he's in his home, we want specific beats to be synthezoid, even though they're visual effects shots, just because it's who he is when he's at home with Wanda.' So we let the story determine when we'd use the visual effects."
The visual effects team for WandaVision underline the importance of matching the bar set by the Marvel Studios movies, and having the effects elevate and add to what's happening, but not overshadow or take anything away from it, and Vision's CGI is a good example of how they're able to do that. The effects may mean things look a little weird before they're applied, so unfortunately don't do Paul Bettany any favors, but in both black-and-white and color it pays off - and makes Elizabeth Olsen's performance all the more impressive too.