<unk> <unk> <unk> <unk> <unk>  Passage: The film's development began when Marvel Studios received a loan from Merrill Lynch in April 2005. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ With the signing of Johansson in March 2009, the film was pushed back for a 2012 release. Whedon was brought on board in April 2010 and rewrote the original screenplay by Zak Penn.<unk> Whedon was brought on board in April 2010 and rewrote the original screenplay by Zak Penn. Production began in April 2011 in Albuquerque, New Mexico, before moving to Cleveland, Ohio, in August and New York City in September. The film was converted to 3D in post-production.<unk> The film was converted to 3D in post-production.  Question: When can a film be made 3D?
postproduction