Visual effects
Industrial Light &amp; Magic (ILM), Digital Domain, and Territory Studio developed the visual effects, with some pre-visualization done by The Third Floor. For three hours three days a week Spielberg met with ILM, which was in charge of the OASIS segments and produced the bulk of the visual effects shots, with 900 in total; Spielberg remarked that "this is the most difficult movie I've done since "Saving Private Ryan"", as three 3-hour long meetings a week were necessitated to discuss the visual effects. Visual effects supervisor Roger Guyett stated that the visual effects team would collaborate with Spielberg and writers Cline and Penn: