Ang Lee has a new religion in digital. Will anyone follow?

Ang Lee’s conversion began with “Life of Pi.”

It was the director’s first movie in 3D, and he sweated anxiously over the implementation of the technology and the torturous process of adapting Yann Martel’s fanciful and allegorical book set principally in a raft containing a 450-pound Bengal tiger.

Lee was excited, though, to challenge himself with, as he says, a new dimension. But an early trial — a test shot with a dancing Indian girl — was disappointing.

“I realized I couldn’t see anything. I couldn’t see her expression. There was so much jitter. I thought something was wrong with the camera,” Lee recalled. “I sort of freaked out. But I couldn’t back out. That started my journey.”

That journey has turned into one of the more unexpected and drastic left-hand turns of any filmmaker as highly regarded as Lee is. The director has long been a moving target, leaping from his native Taiwan (“The Wedding Banquet”) to Jane Austen’s England (“Sense and Sensibility”) to Rick Moody’s Connecticut (“The Ice Storm”) to Chinese wuxia (“Crouching Tiger, Hidden Dragon”) to the Wyoming mountains (“Brokeback Mountain”). But “Life of Pi” began a new quest for Lee.

Since that 2012 film, a global smash with $609 million in ticket sales, Lee has dedicated himself to uncovering what he calls the aesthetics of 3D and digital cinema. Those technologies, he believes, aren’t minor new iterations to moviemaking but, if fully grasped, are a new medium entirely. Lee has, at 64, completely remade himself as a filmmaker. He’s not even sure that term — “filmmaker” — is quite right anymore.

“A lot of things we never ask. Why 24 frames? Where does that number come from? I began to question my faith, the religion I have, which is movies,” Lee said. “I went through a lot of mental crises.”

This weekend, Lee released into theaters the latest result of his newfound digital faith, “Gemini Man.” It stars Will Smith as a government assassin who discovers his former mentor cloned him. Smith is pursued by a younger version of himself (a digital character crafted through motion-capture). Like Lee’s previous film, the Iraq War veteran tale “Billy Lynn’s Long Halftime Walk,” ”Gemini Man” was made with a frame rate of 120 frames-per-second and in 3D.

And like “Billy Lynn,” the response from critics has been brutal. Reviewers have criticized the film’s uninspired story line but critics’ primary contention is with the high-frame rate, or HFR. Lee isn’t the only one to push the format. His HFR comrades include Peter Jackson and James Cameron — both directors more synonymous with technology than Lee.

But skepticism pervades for HFR, even among the studios that have backed it. As with Jackson’s “The Hobbit” and “Billy Lynn,” only a small number of theaters will actually be screening “Gemini Man” in 120 frames per second. In the U.S., it will be projected that way in 14 theaters, albeit not in the high-definition 4K it was made in.

Lee, though, remains a passionate convert.

“When I was testing ‘Billy Lynn,’ when I saw the 120 frames, I wished I was 20 years younger. I could see what’s ahead of me, right away, in half a second,” Lee said. “Here I’m in the third act of my career and I just found something I want to learn and change. That takes a lot of stamina.”

In “Gemini Man,” Lee has striven to recalibrate the entire production — the lighting, the production design, the performances — to suit the clarity of the disarmingly sharp HFR images. The results are radical — nothing looks like “Gemini Man” — and there are occasional flashes of its potential benefits. You can see Lee playing with depth of field and perspective. The performances may seem flatter but have a gripping intimacy. Action sequences are incredibly detailed. There’s imagery of crystalline splendor.

But there’s also a pervasive hollowness to the movie and it remains to be seen if its hyperrealism is part of cinema’s future or if it’s inherently at odds with that thing we call movie magic. Watching a high-frame-rate movie can be like seeing that the emperor has no clothes.

Lee isn’t claiming victory. He knows he’s trying to build a new filmic language for eyes not accustomed to its lucidity.

“It’s a long journey,” he said. “I’m on the third one. It’s been 10 years. I feel like I just scratched the surface, like a digital human.”

James Schamus, the former Focus Features chief and Lee’s longtime collaborator as a writer and producer, says the reactions to “Gemini Man” and “Billy Lynn” have not gone unnoticed. But he hopes Lee perseveres in trying to expand cinema, the history of which has always been propelled by technological advancement. With audiences increasingly inclined to stay home, such a breakthrough could remake the theatrical experience.

“Ang is somebody who’s always departing for a further shore,” Schamus said. “He’s been doing this since he was a kid. If, when you see Ang, you’re not seeing the back of his head — because he’s moving somewhere further that you don’t know where it is — then you haven’t been seeing Ang. That’s who he is. And that’s who he always will be.”

“Gemini Man” hit theaters just ahead of another New York filmmaker’s digitally re-aged creation: Martin Scorsese’s “The Irishman.” The effects that went into crafting a younger Will Smith aren’t the same as those used for Robert De Niro and Al Pacino, but Lee is curious to compare notes with Scorsese. Both are on the board of the Film Foundation, the nonprofit dedicated to film preservation.

“I’ll give him a call pretty soon. You show yours, I’ll show mine,” said Lee, chuckling. “I revere him. We used the same sound crew. Sometimes we heard a little bit what’s going on on the other set. I’m looking forward talking to him to see how the experience differs and what we can learn from each other.”

An education is what Lee is after, as quick as possible. Coaxing audiences along with him hasn’t been easy, and this isn’t an inexpensive quest. “Gemini Man,” a Paramount Pictures release, was made for about $140 million. “Billy Lynn” grossed a disappointing $30.9 million worldwide for Sony Pictures.

“I hope people understand this is a very hard task,” Lee said. “We tried really hard. Every movie, I like to think, is an experiment. We try something, we see if it works.”