Why are some scenes of a movie shot in public places?
<PERSON> pointed out in his/her answer (towards the end) about a <PERSON> spoiler that had been leaked by public. It is one of the underlying points that fuel the question. What is the need/requirement to shoot a scene in a public place? It involves dangers like:
1. Getting a major plot point spoiled (A leaked photo from Endgame showing the characters in New York battle costumes).
2. Causing disruptions in the day to day working of that public place (for example in Mission Impossible movies where a certain area is kept under lockdown for the scene to be shot and traffic has to be diverted, for example <PERSON> film shoot to cause traffic delays on Las Vegas Strip).
3. If area is not locked down, then there is the chance of public crossing/interfering with the movie scenes in one way or other (like people getting in front of cameras).
4. The dangers of keeping crew/celebrity out in the open (I raise this because I have seen celebrities [not all but the more famous ones] escorted by bodyguards when they are in public).
There are alternatives:
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Shoot in a set/studio like Ramoji Film City (I mention this studio because I have been there and I was told that movies which require public places like a railway station had a counterpart there).
2. Using CGI/green screen to create the environment: A scene from an Indian movie-Singham 2 involved a well known bridge known as the Bandra Worli Sea Link which has strict restrictions attached to it. However, the movie replicated the place nice enough using CGI.
So, if a scene is to be shot in say Paris, on a public road, then what makes it so important to shoot there and there itself considering above dangers and ignoring above alternatives. Why would the person, who has control over this particular scene, decide to go with a public place? To achieve realism?
A studio might not have a place that would look like the road in Paris, but there is CGI. Modifications can be done with CGI after the scene is shot in a studio. After all, an entire planet (Titan in Avengers Infinity War) was made with CGI. Even if CGI is costly, then is it less efficient than having to talk with authorities of a public place, get permissions, make appropriate payments, deal with the risks and shoot in public? 900