Port's team knew they had to do justice to all of the villains. It was important to be true to the nuances of each character, and the previous films were looked at for reference. The Spider-Man 2 team had a lot of reference photos to pull from. Port's team was able to make the puppeteer photos look similar to the archive photos. He admits that it couldn't be like that for every character, since a lot of the reference material just didn't exist anymore.
Spider-Man 3 baddie Sandman, played by Thomas Haden Church, appeared to be the biggest hurdle. Port admits that interviewing companies that had worked on Spider-Man movies was difficult for No Way Home, as the villain is in his sand form for most of the movie. It was difficult to create the character back in 2007. Port admitted that there was a collective post-traumatic stress disorder for the second outing. The team used alternate takes from Spider-Man 3 and re-projected them onto their full version of Church.
The villains in No Way Home had to be de-aged because of the narrative conceit that they were pulled from their battles with Spider-Men. Unless it was during an action sequence, where the villains were made in full. The facial tracking system was the most time consuming part of the process, but it was the most important part. The team didn't want to use any facial detail in Green Goblin, so it was de-aged. Port notes that they kept all the details from the original photography.
No Way Home has 2,500 shots of visual effects, and a lot of them come from the action scenes. The three Spider-men were put against the five villains on Liberty Island in Tom Holland's costume. Port says that the time it took to replace Spider-Man's costume with his digital Iron Spider suit was a bit of a nail-biter. The Iron Spider suit appears to have been finished by the end of the film.
The Hollywood Reporter.
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