David Cronenberg remembers the time Oliver Stone asked him, “David, does it bother you to be such a marginal filmmaker?”

To which Cronenberg, one of Canada’s most admired and famous directors, replied, “Well, Oliver, it depends. How big of an audience do you need?”

Therein lies the secret to Cronenberg’s success. Cosmopolis, his new movie opening Friday, is an adaptation of Don DeLillo’s novel about a young billionaire named Eric Packer who spends a day in his limo riding around New York City in search of a haircut.

There is practically no traditional plot in Cosmopolis. More than half the movie takes place inside the limo, where Eric has meetings with his staff, gets a checkup from his doctor (“Your prostate is asymmetrical”) and even has sex. Although Eric is played by Robert Pattinson, the hugely popular star of the Twilight series, Cosmopolis is a tough sell for the multiplex crowd — a rigorous, challenging and oddly hypnotic movie filled with dense, jargon-heavy dialogue.

At 69, Cronenberg continues to make his heady movies the hard way.

“When you’re a filmmaker, you spend a year and a half of your life — maybe more — putting these things together: You have to get your financing in place and you go after actors who will reject you,” he says. “It’s a difficult process. So the movie has to really excite and intrigue me and make me feel like I’m going to discover something by making it,” he says.

“Naturally, you have to tailor the budget to suit the subject matter. No one is going to spend $200 million on Cosmopolis. But if you’re realistic about expectations and the size of your audience, and you’re willing to work for not that much money, you can come up with very interesting things.”

Cosmopolis’ $20 million price tag still seems high for such an outside-the-box movie, but Cronenberg offset the risk to financiers by casting Pattinson, who appears in every scene. (Colin Farrell was originally set to play Eric, but had to back out due to scheduling conflicts.)

“I got the script out of the blue and was offered the role, which was a little shocking,” Pattinson says. “Usually, the movies I am offered straight-up are terrible. This script felt so original, it was almost gleaming.

“I knew there was a movie to be made here. I was just worried that I might not be the one to pull it off. I kept thinking ‘There are tons of people better than me for this job!’ It took me a while to make peace with that.”

Cosmopolis offered Pattinson the opportunity to try a kind of minimalist acting he hadn’t done before. Eric Packer is a detached, aloof man who rarely expresses what he’s feeling. On the page, DeLillo makes us privy to his thoughts and interior monologue; on screen, Pattinson uses small gestures, the faintest trace of a smile or a frown and the hardening of a stare to convey his inner state.

“At the start of the movie, I am wearing this dark, blank suit,” he says. “I am wearing completely blacked-out sunglasses and I’m standing still, not moving. Every tool actors use for their performance has been taken away from me,” he says.

“But I felt secure because I knew David was watching me — really watching me — and that gives you confidence. Most of the time on movie sets, I question whether the director is even paying attention to what I’m doing.”