Ewen McGregor plays Mark Rent Boy Renton in the movie Trainspotting.
Danny Boyle's Trainspotting sequel will be titled T2 and will be released on January 27 next year.
Ewan McGregor, Ewen Bremner, Jonny Lee Miller and Robert Carlyle are all set to reprise the roles they first played two decades ago.
Boyle also directed the 1996 hit movie, a black comedy
which follows a group of heroin addicts in a deprived area of Edinburgh in the late 1980s.
A 45-second clip using footage from the original film was shared by the Sony Pictures UK Twitter account to mark T2's first day of shooting on Monday.
However, photographs have already emerged of Bremner in character as Daniel "Spud" Murphy during pre-production in Edinburgh last week.
