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Tangled
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====Technology development==== Existing technology continued to present difficulties: in particular, animating hair turned out to be a challenge. Senior software engineer Kelly Ward spent six years writing programs to make it move the way they wanted.<ref>{{cite web|url=http://www.dapsmagic.com/geekscorner/geek-links/daps-magic-interviews/roundtable-interview-with-glen-keane-march-17-2011/|title=Roundtable Interview with Glen Keane|date=March 17, 2011|publisher=DAPs|access-date=April 11, 2011|archive-url=https://web.archive.org/web/20120921063943/http://www.dapsmagic.com/geekscorner/geek-links/daps-magic-interviews/roundtable-interview-with-glen-keane-march-17-2011/|archive-date=September 21, 2012}}</ref> As late as January 2010, the directors were still not sure if the Rapunzel character's length of hair was going to work. These problems were finally solved in March:<ref>{{cite web|url=http://www.siouxcityjournal.com/entertainment/movies/article_730035f2-121d-54a4-bd18-ab1ec0b684c0.html|title='Tangled' directors unravel film's secrets|date=December 5, 2010|work=SiouxCityJournal.com|access-date=December 8, 2010|archive-date=December 10, 2010|archive-url=https://web.archive.org/web/20101210072616/http://www.siouxcityjournal.com/entertainment/movies/article_730035f2-121d-54a4-bd18-ab1ec0b684c0.html|url-status=live}}</ref> An improved version of a hair simulation program named Dynamic Wires, originally developed for ''Bolt'', was eventually used. To make hair float believably in water, and to surmount other similar challenges, [[discrete differential geometry]] was used to produce the desired effects, freeing the animators from executing these specific tasks directly, which would have taken days instead of minutes.<ref>{{cite news|url=https://www.nytimes.com/2010/12/30/movies/30animate.html|title=Perfecting Animation, via Science|date=December 29, 2010|newspaper=NYTimes.com|author=Patricia Cohen|access-date=December 12, 2012|archive-date=May 10, 2020|archive-url=https://web.archive.org/web/20200510190238/https://www.nytimes.com/2010/12/30/movies/30animate.html|url-status=live}}</ref>
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