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When you're dealing with shooting a lot of live action in 3D, you're committed to how much 3D you're giving the audience.

"Bryan Singer Talks Big Visual Effects, 3D, Bringing a Fairy Tale to Life on a Grand Scale, and More on the Set of JACK THE GIANT SLAYER". Group interview, collider.com. January 31, 2013.
When you're dealing with shooting a lot of live action in 3D, you're committed to how much 3D you're giving the audience.