Just one day after his Infernal Affairs 2 (co-directed with Alan Mak Siu-fai) was selected as Hong Kong's entry for the Oscars, filmmaker Andrew Lau Wai-keung (below) is out promoting his latest production, a horror flick called The Park (right). The movie, which opens today, is his second foray into the genre and stars Canto-pop singers Bobo Chan and Edwin Siu Ching-nam. It follows a group of friends who are killed one after another in the park. Although Lau completed filming in 11/2 months, post-production work took seven long months. The reason: the film is 3-D, and the first such film in Hong Kong. 'I got the idea five years ago when I was in a Las Vegas casino watching one of those Imax films, and thought that we need to do this,' Lau says. 'Even the digital-effects technicians were not sure if we could do it.' It's very different from his usual action films, such as the Young & Dangerous series. 'You cannot make only one kind of film, you have to make many different kinds. 'Otherwise, people forget you. I think next year I will make a comedy - but I cannot tell you who will be in it yet.' So sit back, stick on the 3-D glasses, and enjoy.