The Hobbit 2 spoilers: Sir Ian McKellen revealed that he frequently considered quitting his job in acting while working on The Hobbit trilogy.

The X-Men actor admitted that the camera trickery used in the film to make him appear taller than his dwarves and hobbits co-stars forced him to work alone in green screen acting.

"I got absolutely miserable and had a little cry to myself. I didn't realise that the microphone I was wearing was open so everybody could hear me muttering to myself about how I wanted to go home and so on," he revealed.

Director Peter Jackson explained that the introduction of 3D made it difficult for him to create an illusion that would make Sir Ian appear bigger just like what viewers see in Lord of the Rings trilogy.

 "With 3D it tells you exactly how far away they are and it tells you the whole thing is a cheat," thus making it impossible for the actors to work with each other.

To create illusion that would make Gandalf bigger, his entire scene in the Hobbit 2 movie should be shot separately.

He continued explaining: "We have a camera that looks at the dwarves and Bilbo in a set that's built to their scale and a camera that looks at Gandalf on a green screen which is 25% closer, which makes him that much bigger."

The stage actor expressed his concern via email saying, "I don't want to make this film if this is what I'm going to have to do."

The Hobbit director, Peter Jackson tried to make things better for Sir Ian making his tent more "work worthy" by decorating it with props that were being featured in the Lord of the Rings film.

The veteran actor then admitted that, "I was made to feel, as so often happens when you're working with Peter Jackson and his colleagues, that you belong and you're to feel at ease and at home and happy.

However, once the flowers faded I noted they weren't replaced and I think I was meant then to get on with the job."

The Hobbit 2: The Desolation of Smaug will be hitting theaters on December 13.

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