sentences:  Film producer Andrew Macdonald read "Trainspotting" on a plane in December 1993 and thought it would make a good basis for a film.Ewan McGregor was cast as Renton, while Ewen Bremner, who played Renton in the novel's stage adaption, was cast as Spud.In preparation for the role, McGregor lost 2 stone (12.7 kilograms) and shaved his head.