The same forest is said to have inspired J. R. R. Tolkien to write "The Hobbit". Later that month, filming took place at Norwich Cathedral in Norwich, Norfolk. About the performance-capture process Singer stated, "It's fascinating ... It takes you back to play-acting as a kid in your living room because you are running around and having to imagine that you are in Gantua and imagine that there are these weapons and all these giant things. But there's nothing when you are there other than styrofoam and blocks. It forces the actors to regress to when they would play-act as kids or do minimalist theatre. But in that way it's fascinating - I can see why Robert Zemeckis and James Cameron have started to shoot pictures this way". In January 2012, Warner Bros. moved back the release date by nine months, from June 15, 2012, to March 22, 2013. "The Hollywood Reporter" stated: "Warner can likely afford the move because of Christopher Nolan's "The Dark Knight Rises", which opened in July. And moving the film back gives the studio more time for special effects, as well as a chance to attach trailers for it to Peter Jackson's Christmas tentpole """. In October 2012, Warner Bros. again moved the release date, this time to March 1, 2013, three weeks earlier than the previous date. Warner Bros also changed the title of the film from "Jack the Giant Killer" to "Jack the Giant Slayer". The film's special effects were completed by seven different visual effects houses: Digital Domain, Giant Studios, The Third Floor, MPC, Soho VFX, Rodeo FX and Hatch Productions. Creating the giants took four main steps. The first step was Pre-Capture, in which performance capture was used to capture the actor's facial and body movements and render them in a real-time virtual environment. The second step took place during principal photography, where Simulcam technology was used to help the human characters virtually interact with the giants that were rendered earlier in Pre-Capture. The third step was Post-Capture, a second performance capture shoot to adjust giants' movements to seamlessly fit the live-action performances. The final step involved putting the finishing touches on the giant's animation, skin, hair and clothing, and composition in the shots. Creating the beanstalk involved two main requirements: set extension for shots of the actors interacting with the beanstalk, which were shot against a bluescreen, and complete CG renderings for shots of the beanstalk growing and extending from Earth into the world of the giants.