Mumbai -- Bollywood actor Ranbir Kapoor has signed on to star in director Anurag Kashyaps ambitious project Bombay Velvet. The film is based on eminent historian Gyan Prakashs book Mumbai Fables, a semi-fictional study of Bombay in the sixties. While talking to reporters on the sidelines of FICCI Frames event here, Anurag said, "He fits the role, he liked the role. With him I can rest easy with the kind of money involved in it. I liked his performance in most of his films till date. It was not due to his performance in 'Rockstar' that I cast him. I liked him in 'Rocket Singh'. I must say his performance in 'Rockstar' was icing on the cake in his acting career. He added, "It does not depend on me to cast him, it is important for an actor also to like and feel to do the film. As far as commercial success of this film is concerned, it will come if I make a good film. Anurag said the Kapoor lad would read the book to get into the skin of his character. Any good actor will say what is the source material and he did ask him about the same. So I am sure he would read the book. He liked the script and hence he agreed to do the film," Anurag said.