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Rendering refractive objects like ice takes extensive time in CGI, [79] and the scene where Elsa built her palace took 30 hours to render. [88] Lighting the clear ice required careful consideration of how it would reflect light realistically. The team faced challenges creating realistic visuals for snow, ice, and their correct combination in Frozen, aiming for a visually stunning and intricate ice environment without strictly adhering to physical accuracy. [79] To achieve this, they use various elements including geometric and painted snow, different snow shapes, and snow sparkles to create a stable, renderable, and art-directable appearance. [91] After receiving insights from physicist Dr. Kenneth G. Libbrecht who explained the formation of snow crystals at a molecular level, they approached this by focusing on the natural growth and shapes of these elements and avoiding morphing or artificial movements. The transparent ice frameworks and refractive ice pillars of Elsa's Ice Palace required intricate optical properties. Unlike snow, ice is optically active and its colors can shift based on the surroundings. It also refracts light into rainbow highlights, varies from transparent to opaque, features a smooth or patterned surface, and reflects and distorts the surrounding environments. [92]Geal, Robert (June 1, 2016). "Frozen, Homosexuality and Masochism". Film International. 14 (2): 99–111. doi: 10.1386/fiin.14.2.99_1. hdl: 2436/620365. Meanwhile, the producers of Once Upon a Time (made by Disney-owned ABC Studios) independently conceived of and obtained authorization from both ABC and Disney for a Frozen-inspired crossover story arc in the show's fourth season, which was first revealed at the end of the show's third season in May 2014, and premiered in September 2014. [297] [298] On September 2, 2014, ABC broadcast The Story of Frozen: Making a Disney Animated Classic, a one-hour "making of" television special. [299] [300] [301] At the end of the special, Lasseter announced that the production team would be reuniting to make Frozen Fever, a short film which debuted in theaters with Disney's Cinderella on March 13, 2015. [302] [303] On September 4, 2014, Feld Entertainment's Disney on Ice presented the world premiere of a touring ice skating show based on the film at Amway Center in Orlando, Florida. [304] [305] Gross, Terry (April 10, 2014). "Transcript: Songwriters Behind 'Frozen' Let Go Of The Princess Mythology". Fresh Air. NPR. Archived from the original on May 19, 2014 . Retrieved May 14, 2014.