Facebook Three Thorins but which one is actor Richard Armitage?
Although Jackson will be finished with his actors by the end of today, he still has a lot of post-production work to complete on the second instalment of the trilogy, The Desolation of Smaug, and the final part, There and Back Again.
Still, even with all the pressure on him, he hasn't lost his sense of humour.
"I asked the various Thorins to pose just before they headed off to lunch. One of these is Richard Armitage, and two of them are not. It's your guess ... The one in the middle is a little psycho," he wrote.
"I am looking forward to making movies with everyone the same height in the future."
Jackson first began filming Tolkien's works in October 1999, with The Lord of the Rings.
The Lord of the Rings and Hobbit movies have given thousands of Kiwis a start in the film industry, and a huge boost to New Zealand's tourism industry.
However, the production has always been smooth. A complicated fight over the film rights, a fallout between Jackson and the studio heads, the bankruptcy of MGM and union dispute almost stopped the book getting to the screen.
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