Director Terry Gilliam has revealed the nightmarish conditions he was forced to work under while making his latest film The Zero Theorem. The movie centres on a reclusive computer programmer working on a formula to determine whether life has any meaning, and Gilliam knew he wanted Christoph Waltz for the role after meeting the Django Unchained star at an awards ceremony. However, the Oscar winner's demanding work schedule meant filming was restricted to just over a month, forcing the cast and crew to work long hours in an effort to complete the shoot in time. The director tells Britain's The Independent newspaper, "It was a nightmare. We had 36 days - after that, Christoph was gone. That was the end of it. We had a short preparation time, and didn't have the money I needed. Towards the end we shot for eight days straight and people were falling asleep on the set. It was horrible."