In Malta, a replica of about one-third of Rome's Colosseum was built, to a height of fifty-two feet (sixteen meters), mostly from plaster and plywood (the other two-thirds and remaining height were added digitally). The replica took several months to build, and cost an estimated $1 million. The reverse side of the complex supplied a rich assortment of Ancient Roman street furniture, colonnades, gates, statuary, and marketplaces for other filming requirements. The complex was serviced by tented "costume villages" that had changing rooms, storage, armorers, and other facilities. The remainder of the building was added in digitally by using computer graphics imagery, using set-design blueprints and textures referenced from live-action, and rendered in three layers, to provide lighting flexibility for compositing in Flame and Inferno software. In the Colosseum scenes, only the bottom two decks are actually filled with people. The other thousands of people are computer animated or are cardboard cut-outs.

Film

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