A group of Hong Kong filmmakers have started shooting what they claim will be the world's first 3D pornographic film, a report said Sunday.

The 3.2 million-US-dollar '3-D Sex and Zen: Extreme Ecstasy', set for release in May, has already generated interest in a host of Asian film markets, as well as Europe and the US, the Sunday Morning Post reported.

Loosely based on a piece of classical Chinese erotic literature, The Carnal Prayer Mat, the movie will star Japanese adult actresses Yukiko Suo and Saori Hara, the Post said.

The film chronicles the story of a young man who, after being introduced to the erotic world of a duke, realises his ex-wife is the love of his life and features "orgies, swinging and some very graphic sex scenes", the paper said.

Producer Stephen Shiu acknowledged that censors would likely block the movie's screening in mainland China, a key market for Hong Kong filmmakers.

"(But) we are almost closing deals with some markets including Japan, Korea, Southeast Asia and some pay TV channels in Hong Kong," Shiu told the paper.

Italian director Tinto Brass has announced he would produce a 3D remake of his 1979 erotic film Caligula, while Hustler plans to release a pornographic spoof of 3D science fiction film Avatar, the top-grossing movie of all time which has earned some 2.7 billion US dollars worldwide since its release.