During a press conference to promote final instalment Breaking Dawn - Part 2, Collider quotes Pattinson as saying that he has frequently found the role of vampire Edward Cullen frustrating.
Pattinson explained that the character is written to be an ideal, but as an actor his instincts are to try and find the flaws in him, which at times made for a difficult conflict.
"I still had the same frustration with trying to play it, the entire way through, right up until the last shot. It's a strange part because, on one hand, a lot of the audience projects their idea of Edward onto him.
"It doesn't matter what he is. They want him to be a certain way. And then, my instincts to try to play it were to try to find the fallibility in him and the weaknesses."
Copyright: Summit EntertainmentHe went on to suggest that trying to play a character who is seen by audiences as "a perfect thing" is meaningless.
"You're trying to play an archetype on one hand and a character on the other, so I felt insanely frustrated, right up until the last shot, and then it ended," he explained.
Pattinson has previously described a sex scene he shares with Kristen Stewart as "ridiculous", and dubbed the film's ending "bizarre... but really sweet".
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The Twilight Saga: Breaking Dawn - Part 2 will be released on November 16.
Watch a trailer below: